Pub Date : 2026-04-15Epub Date: 2026-02-03DOI: 10.1016/j.palaeo.2026.113606
Sinan Wang , Xunlin Yang , Hai Cheng , Wenming Zhou , Guofeng Li , Wanli Xiang , Rui Zhang , R. Lawrence Edwards
The evolution and millennial-scale variability of the Asian Summer Monsoon (ASM) during Marine Isotope Stage 9 (MIS 9) remain insufficiently constrained due to the limited availability of high-resolution archives. Here, we present a reconstruction of ASM dynamics between 340 and 285 ka BP, based on high-resolution (∼68-year) stalagmite δ18O records from Jinfo Cave, southwestern China. Results demonstrate that orbital-scale ASM variability was primarily modulated by Northern Hemisphere summer insolation, allowing subdivision into five substages: MIS 9e, MIS 9d, MIS 9c, MIS 9b, and MIS 9a. Synchronous comparisons with other speleothem datasets corroborate a spatial pattern characterized by pronounced variability in southwestern China and relative stability in the southeast. Within MIS 9c, three distinct millennial-scale weak monsoon events were identified, indicating substantial hydroclimate instability during interglacial conditions. Spectral analyses reveal dominant ∼2–4 kyr periodicities, analogous to Dansgaard–Oeschger (DO) events of the last glacial period, likely linked to Atlantic Meridional Overturning Circulation (AMOC) instability under enhanced insolation forcing. Comparisons with MIS 5–4 highlight convergent responses in insolation-driven forcing, critical ice-volume thresholds, and monsoon evolution, suggesting an intrinsic propensity of the climate system toward quasi-cyclic oscillations.
{"title":"Millennial-scale hydroclimate variability of the Asian monsoon during MIS 9 from stalagmite records","authors":"Sinan Wang , Xunlin Yang , Hai Cheng , Wenming Zhou , Guofeng Li , Wanli Xiang , Rui Zhang , R. Lawrence Edwards","doi":"10.1016/j.palaeo.2026.113606","DOIUrl":"10.1016/j.palaeo.2026.113606","url":null,"abstract":"<div><div>The evolution and millennial-scale variability of the Asian Summer Monsoon (ASM) during Marine Isotope Stage 9 (MIS 9) remain insufficiently constrained due to the limited availability of high-resolution archives. Here, we present a reconstruction of ASM dynamics between 340 and 285 ka BP, based on high-resolution (∼68-year) stalagmite δ<sup>18</sup>O records from Jinfo Cave, southwestern China. Results demonstrate that orbital-scale ASM variability was primarily modulated by Northern Hemisphere summer insolation, allowing subdivision into five substages: MIS 9e, MIS 9d, MIS 9c, MIS 9b, and MIS 9a. Synchronous comparisons with other speleothem datasets corroborate a spatial pattern characterized by pronounced variability in southwestern China and relative stability in the southeast. Within MIS 9c, three distinct millennial-scale weak monsoon events were identified, indicating substantial hydroclimate instability during interglacial conditions. Spectral analyses reveal dominant ∼2–4 kyr periodicities, analogous to Dansgaard–Oeschger (D<img>O) events of the last glacial period, likely linked to Atlantic Meridional Overturning Circulation (AMOC) instability under enhanced insolation forcing. Comparisons with MIS 5–4 highlight convergent responses in insolation-driven forcing, critical ice-volume thresholds, and monsoon evolution, suggesting an intrinsic propensity of the climate system toward quasi-cyclic oscillations.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113606"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, we reconstruct high-resolution vegetation and climate variability over the past 6100 years using a multi-proxy approach (i.e., pollen, stable organic carbon isotopes (δ13C), and environmental magnetic parameters) from an alpine peat sequence of the Dayara meadow, located at ∼3430 m altitude in the upper Bhagirathi basin of the Central Higher Himalaya. The chronology of the studied lake-peat sequence, constrained by four radiocarbon (14C) ages, indicates that peat development in the region commenced around 6100 cal yr BP. Pollen combined with δ13C results reveal a significantly warmer and wetter climate between ∼6100 and 5300 cal yr BP, corresponding to the late phase of the Holocene Climate Optimum (HCO) in the upper Bhagirathi basin. Around ∼5300 cal yr BP, an abrupt climate shift occurred, which led to a prolonged dry spell between ∼4800 and 3400 cal yr BP. This dry spell was characterized by a decline in arboreal tree taxa, particularly Quercus, Alnus, and Betula, the complete disappearance of Juglans, and a notable increase in drought-tolerant herbs, such as Chenopodiaceae-Amaranthaceae and Ephedra. This prolonged cold-dry phase is correlated with a weakening of the Indian summer monsoon (ISM) intensity, as previously recorded in the core summer monsoon zone, in response to regional warming of the Indo-Pacific Warm Pool. Subsequent increase in arboreal tree taxa and moisture-loving pollen taxa, along with a reduced representation of drought-tolerant herbs, suggests a warm and wet climate between ∼3400 and 1600 cal yr BP (Roman Warm Period ∼2200 to 1600 cal yr BP), ∼1000 to 500 (Medieval Climate Anomaly), and from ∼130 cal yr BP to the Present (Current Warm Period). In contrast, the intermittent periods between ∼1600 and 1000 (Dark Ages Cold Period) and ∼ 500 to 130 cal yr BP (Little Ice Age, LIA) were dominated by cold and drought-tolerant desert steppe vegetation. The highest concentration of pollen and fern, especially from sub-alpine tree taxa, between ∼6100 and 5300 cal yr BP, suggests an upward shift of the tree line beyond its modern-day position, reflecting optimal climatic conditions. Conversely, during the LIA, the tree line descended to its lowest elevation in the past ∼6100 years. The strengthened ISM episodes during the middle to late Holocene likely provided the moisture necessary for the glacier advances in the upper Bhagirathi catchment.
在这项研究中，我们使用多代理方法（即花粉、稳定有机碳同位素（δ13C）和环境磁参数）重建了过去6100年的高分辨率植被和气候变化，这些方法来自位于喜马拉雅中部高海拔Bhagirathi盆地上部海拔~ 3430 m的Dayara草甸高寒泥炭层。研究的湖泥炭层序年代学，根据4个放射性碳（14C）年龄的限制，表明该地区泥炭发育始于6100 cal yr BP左右。在~ 6100 ~ 5300 cal yr BP之间，Bhagirathi盆地上部出现了明显的暖湿气候，对应于全新世气候优化（HCO）的晚期。在~ 5300 cal yr BP左右，气候突变发生，导致了~ 4800 ~ 3400 cal yr BP之间的长时间干旱期。这一干旱期的特点是乔木类群的减少，特别是栎、桤木和桦树，胡桃木完全消失，而耐旱草本植物，如藜科-苋菜科和麻黄的显著增加。这种延长的冷干期与印度夏季风（ISM）强度减弱有关，正如之前在核心夏季风区记录的那样，这是对印度-太平洋暖池区域变暖的反应。随后乔木分类群和亲湿花粉分类群的增加，以及耐旱草本植物的减少，表明在~ 3400至1600 calyr BP（罗马温暖期~ 2200至1600 calyr BP）、~ 1000至500（中世纪气候异常）以及从~ 130 calyr BP到现在（当前温暖期）之间存在温暖潮湿的气候。相反，在~ 1600 ~ 1000年（黑暗时代冷期）和~ 500 ~ 130 cal yr BP（小冰期，LIA）之间的间歇期以耐寒和耐旱的荒漠草原植被为主。最高浓度的花粉和蕨类植物，特别是来自亚高山树木分类群的花粉和蕨类植物，在距今约6100至5300 cal - yr BP之间，表明树木线在其现代位置之上向上移动，反映了最佳的气候条件。相反，在LIA期间，树线下降到过去约6100年来的最低海拔。全新世中晚期的ISM强化事件可能为Bhagirathi上游流域的冰川推进提供了必要的水分。
{"title":"Climate variations over the past 6100 years in the high-altitude Central Himalaya","authors":"Suman Rawat , Priyeshu Srivastava , N.R. Phadtare , A.P. Dimri","doi":"10.1016/j.palaeo.2026.113614","DOIUrl":"10.1016/j.palaeo.2026.113614","url":null,"abstract":"<div><div>In this study, we reconstruct high-resolution vegetation and climate variability over the past 6100 years using a multi-proxy approach (i.e., pollen, stable organic carbon isotopes (δ<sup>13</sup>C), and environmental magnetic parameters) from an alpine peat sequence of the Dayara meadow, located at ∼3430 m altitude in the upper Bhagirathi basin of the Central Higher Himalaya. The chronology of the studied lake-peat sequence, constrained by four radiocarbon (<sup>14</sup>C) ages, indicates that peat development in the region commenced around 6100 cal yr BP. Pollen combined with δ<sup>13</sup>C results reveal a significantly warmer and wetter climate between ∼6100 and 5300 cal yr BP, corresponding to the late phase of the Holocene Climate Optimum (HCO) in the upper Bhagirathi basin. Around ∼5300 cal yr BP, an abrupt climate shift occurred, which led to a prolonged dry spell between ∼4800 and 3400 cal yr BP. This dry spell was characterized by a decline in arboreal tree taxa, particularly <em>Quercus</em>, <em>Alnus,</em> and <em>Betula</em>, the complete disappearance of <em>Juglans,</em> and a notable increase in drought-tolerant herbs, such as Chenopodiaceae-Amaranthaceae and <em>Ephedra.</em> This prolonged cold-dry phase is correlated with a weakening of the Indian summer monsoon (ISM) intensity, as previously recorded in the core summer monsoon zone, in response to regional warming of the Indo-Pacific Warm Pool. Subsequent increase in arboreal tree taxa and moisture-loving pollen taxa, along with a reduced representation of drought-tolerant herbs, suggests a warm and wet climate between ∼3400 and 1600 cal yr BP (Roman Warm Period <em>∼</em>2200 to 1600 cal yr BP), ∼1000 to 500 (Medieval Climate Anomaly), and from ∼130 cal yr BP to the Present (Current Warm Period). In contrast, the intermittent periods between ∼1600 and 1000 (Dark Ages Cold Period) and ∼ 500 to 130 cal yr BP (Little Ice Age, LIA) were dominated by cold and drought-tolerant desert steppe vegetation. The highest concentration of pollen and fern, especially from sub-alpine tree taxa, between ∼6100 and 5300 cal yr BP, suggests an upward shift of the tree line beyond its modern-day position, reflecting optimal climatic conditions. Conversely, during the LIA, the tree line descended to its lowest elevation in the past ∼6100 years. The strengthened ISM episodes during the middle to late Holocene likely provided the moisture necessary for the glacier advances in the upper Bhagirathi catchment.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113614"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-15Epub Date: 2026-02-11DOI: 10.1016/j.palaeo.2026.113633
Xu Lin , Siyu Han , Lin Wu , Marc Jolivet , Dongliang Liu , Zhonghai Wu , Weiming Liu , Jing Liu-Zeng
<div><div>The existence of a Mesozoic proto-Tibetan Plateau remains a subject of ongoing debate due to the difficulty in constraining Tibet's paleotopographic evolution. The Longmen Mountains-Sichuan Basin system, located along the eastern margin of the Tibetan Plateau, was selected as the research object to investigate this issue. This study conducts systematic detrital zircon U<img>Pb and fission track double dating analyses on Cretaceous-Paleogene sandstone samples from the Shiyang section in the southwestern Sichuan Basin, aiming to: (1) reconstruct the Meso-Cenozoic exhumation history of the Longmen Mountains; and (2) explore the Mesozoic tectonic evolution patterns of the Tibetan Plateau through comparative studies with other systems, such as the West Kunlun-Tarim, Altun-Qaidam, and Qilian Mountains-Hexi Corridor. The Cretaceous strata within the Shiyang section of the western Sichuan Basin exhibit consistent detrital zircon U<img>Pb age distributions (<em>n</em> = 388), characterized by five prominent age peaks: late Paleozoic-early Mesozoic (∼252–217 Ma), early Paleozoic (∼467–432 Ma), Neoproterozoic (∼779–732 Ma), and Paleoproterozoic-Neoarchean (∼1812–1675 Ma and ∼ 2540–2400 Ma). Moreover, the Paleogene strata contain five major age clusters (<em>n</em> = 290): ∼275–247, ∼430–407, ∼807–622, ∼1770–1675, and ∼ 2430 Ma. These results indicate that the detrital zircons from both the Cretaceous and Paleogene successions in the Shiyang section were mainly sourced from the Longmen Mountains and the eastern Songpan-Ganze flysch fold belt. Analysis of 678 detrital zircon grains from Cretaceous to Paleogene strata in the Shiyang section reveals multiple magmatic age populations, with zircon fission track ages clustering in distinct intervals including the Neoproterozoic (658–595 Ma), Paleozoic (488–363 Ma), late Paleozoic (313–259 Ma), and Meso-Cenozoic (245–31 Ma). Zircon fission track age peaks spanning Neoproterozoic to Paleozoic (658–259 Ma) intervals document pre-Longmen Shan orogeny thermal events along the western Yangtze Craton margin. The Meso-Cenozoic zircon fission track age peaks (245–31 Ma) document episodic exhumation of the Longmen Mountains, with three principal phases identified. The earliest phase (245–223 Ma) corresponds to the Indosinian orogeny driven by Paleo-Tethys subduction, followed (187–86 Ma) by the Yanshanian orogeny associated with combined Paleo-Pacific back-arc compression and Neo-Tethys subduction. The youngest phase (64–31 Ma) reflects Himalayan orogenesis resulting from the India-Asia collision. When combined with published datasets, these results provide evidence for synchronous Mesozoic exhumation along the proto-Tibetan Plateau's northern, northeastern, and eastern margins. Integrated datasets reveal the development of an extensive Mesozoic proto-plateau system (>1000 km wide) characterized by thickened crust (>50 km) and elevated topography (>1000 m), which emerged following the early Cretaceous Qia
{"title":"Detrital zircon UPb and fission track double dating constraints on the exhumation history of Longmen Mountains: New insights into proto-Tibetan Plateau evolution","authors":"Xu Lin , Siyu Han , Lin Wu , Marc Jolivet , Dongliang Liu , Zhonghai Wu , Weiming Liu , Jing Liu-Zeng","doi":"10.1016/j.palaeo.2026.113633","DOIUrl":"10.1016/j.palaeo.2026.113633","url":null,"abstract":"<div><div>The existence of a Mesozoic proto-Tibetan Plateau remains a subject of ongoing debate due to the difficulty in constraining Tibet's paleotopographic evolution. The Longmen Mountains-Sichuan Basin system, located along the eastern margin of the Tibetan Plateau, was selected as the research object to investigate this issue. This study conducts systematic detrital zircon U<img>Pb and fission track double dating analyses on Cretaceous-Paleogene sandstone samples from the Shiyang section in the southwestern Sichuan Basin, aiming to: (1) reconstruct the Meso-Cenozoic exhumation history of the Longmen Mountains; and (2) explore the Mesozoic tectonic evolution patterns of the Tibetan Plateau through comparative studies with other systems, such as the West Kunlun-Tarim, Altun-Qaidam, and Qilian Mountains-Hexi Corridor. The Cretaceous strata within the Shiyang section of the western Sichuan Basin exhibit consistent detrital zircon U<img>Pb age distributions (<em>n</em> = 388), characterized by five prominent age peaks: late Paleozoic-early Mesozoic (∼252–217 Ma), early Paleozoic (∼467–432 Ma), Neoproterozoic (∼779–732 Ma), and Paleoproterozoic-Neoarchean (∼1812–1675 Ma and ∼ 2540–2400 Ma). Moreover, the Paleogene strata contain five major age clusters (<em>n</em> = 290): ∼275–247, ∼430–407, ∼807–622, ∼1770–1675, and ∼ 2430 Ma. These results indicate that the detrital zircons from both the Cretaceous and Paleogene successions in the Shiyang section were mainly sourced from the Longmen Mountains and the eastern Songpan-Ganze flysch fold belt. Analysis of 678 detrital zircon grains from Cretaceous to Paleogene strata in the Shiyang section reveals multiple magmatic age populations, with zircon fission track ages clustering in distinct intervals including the Neoproterozoic (658–595 Ma), Paleozoic (488–363 Ma), late Paleozoic (313–259 Ma), and Meso-Cenozoic (245–31 Ma). Zircon fission track age peaks spanning Neoproterozoic to Paleozoic (658–259 Ma) intervals document pre-Longmen Shan orogeny thermal events along the western Yangtze Craton margin. The Meso-Cenozoic zircon fission track age peaks (245–31 Ma) document episodic exhumation of the Longmen Mountains, with three principal phases identified. The earliest phase (245–223 Ma) corresponds to the Indosinian orogeny driven by Paleo-Tethys subduction, followed (187–86 Ma) by the Yanshanian orogeny associated with combined Paleo-Pacific back-arc compression and Neo-Tethys subduction. The youngest phase (64–31 Ma) reflects Himalayan orogenesis resulting from the India-Asia collision. When combined with published datasets, these results provide evidence for synchronous Mesozoic exhumation along the proto-Tibetan Plateau's northern, northeastern, and eastern margins. Integrated datasets reveal the development of an extensive Mesozoic proto-plateau system (>1000 km wide) characterized by thickened crust (>50 km) and elevated topography (>1000 m), which emerged following the early Cretaceous Qia","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113633"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-01Epub Date: 2026-01-23DOI: 10.1016/j.palaeo.2026.113587
Baijun Shang , Tong Li , Hui Gao , Feng Wang , Tonggang Fu
Stable isotopes (δ18O and δD) in precipitation have long served as key proxies for paleoclimate reconstructions under the assumption of a universal temperature effect (TE), where isotopic enrichment correlates with warming. However, this study identifies clear inverse temperature effects (ITE)—where isotopic depletion accompanies higher temperatures—across different climate types and time scales. Analyzing global precipitation isotope data, this study finds that low-latitude regions exhibit significant monthly-scale ITE, expressed as a δ18O-temperature regression slope (δ-TITE) down to −0.46 ‰/°C in Tropical summer. Conversely, high latitudes (> 40°N) maintain a clear TE, with a δ18O-temperature regression slope (δ-TTE) up to 0.44 ‰/°C in Polar climate. The spatiotemporal variability in TE/ITE is driven by atmospheric circulation patterns: monthly-scale ITE in monsoon regions may be linked to moisture source shifts and convective precipitation dominance, whereas TE in high latitudes reflects direct temperature control on isotopic fractionation during condensation. Seasonal/interannual scales show weakened or insignificant TE/ITE in mid-low latitudes due to modulating effects of ENSO, monsoon dynamics, and the Intertropical Convergence Zone (ITCZ), which introduce other drivers like precipitation amount and vapour recycling. These results demonstrate that ignoring time-scale and climate-type dependencies may lead to unreliable paleoclimate reconstructions, while the identification of the ITE of stable isotopes provides a new perspective for stable-isotope based paleoclimate reconstruction research.
{"title":"The inverse temperature effect of precipitation stable isotopes poses a challenge to the paleoclimate reconstructions","authors":"Baijun Shang , Tong Li , Hui Gao , Feng Wang , Tonggang Fu","doi":"10.1016/j.palaeo.2026.113587","DOIUrl":"10.1016/j.palaeo.2026.113587","url":null,"abstract":"<div><div>Stable isotopes (δ<sup>18</sup>O and δD) in precipitation have long served as key proxies for paleoclimate reconstructions under the assumption of a universal temperature effect (TE), where isotopic enrichment correlates with warming. However, this study identifies clear inverse temperature effects (ITE)—where isotopic depletion accompanies higher temperatures—across different climate types and time scales. Analyzing global precipitation isotope data, this study finds that low-latitude regions exhibit significant monthly-scale ITE, expressed as a δ<sup>18</sup>O-temperature regression slope (δ-T<sub>ITE</sub>) down to −0.46 ‰/°C in Tropical summer. Conversely, high latitudes (> 40°N) maintain a clear TE, with a δ<sup>18</sup>O-temperature regression slope (δ-T<sub>TE</sub>) up to 0.44 ‰/°C in Polar climate. The spatiotemporal variability in TE/ITE is driven by atmospheric circulation patterns: monthly-scale ITE in monsoon regions may be linked to moisture source shifts and convective precipitation dominance, whereas TE in high latitudes reflects direct temperature control on isotopic fractionation during condensation. Seasonal/interannual scales show weakened or insignificant TE/ITE in mid-low latitudes due to modulating effects of ENSO, monsoon dynamics, and the Intertropical Convergence Zone (ITCZ), which introduce other drivers like precipitation amount and vapour recycling. These results demonstrate that ignoring time-scale and climate-type dependencies may lead to unreliable paleoclimate reconstructions, while the identification of the ITE of stable isotopes provides a new perspective for stable-isotope based paleoclimate reconstruction research.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"687 ","pages":"Article 113587"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-01Epub Date: 2026-01-22DOI: 10.1016/j.palaeo.2026.113589
Eduardo Islas-Dominguez , Eberhard Gischler , J. Harold Hudson
The skeletal-extension rates of the three main framework-building corals from the mid-late Holocene of Bermuda show distinct responses, either under the same environmental conditions, or within the same species under different conditions. Diploria labyrinthiformis, the only species found in both open and inshore-water environments, shows higher extension rates in the inshore waters of Castle Harbour (4.18 ± 0.56 to 5.55 ± 1.16 mm/year), compared to open water conditions at North Rock (2.53 ± 0.33 to 3.49 ± 0.68 mm/year). Some of these inshore extension rates also exceed those of the same contemporary species elsewhere in Bermuda and the Western Atlantic. Conversely, the extension rates of Pseudodiploria strigosa (2.71 ± 0.91 to 3.76 ± 0.68 mm/year), and the Orbicella annularis group (1.64 ± 0.32 to 2.75 ± 0.86 mm/year), are generally within the range of their contemporary counterparts in Bermuda but lower than those found in the Western Atlantic. Possible reasons for coral extension rate differences between locations including turbidity, water circulation, depositional energy, sediment-clearing abilities of corals, and temperature as well as relationship of coral extension growth to reef accretion are discussed.
{"title":"Skeletal-extension rates of Bermuda framework-building massive corals during the Holocene: Review and new data from rotary drilling","authors":"Eduardo Islas-Dominguez , Eberhard Gischler , J. Harold Hudson","doi":"10.1016/j.palaeo.2026.113589","DOIUrl":"10.1016/j.palaeo.2026.113589","url":null,"abstract":"<div><div>The skeletal-extension rates of the three main framework-building corals from the mid-late Holocene of Bermuda show distinct responses, either under the same environmental conditions, or within the same species under different conditions. <em>Diploria labyrinthiformis</em>, the only species found in both open and inshore-water environments, shows higher extension rates in the inshore waters of Castle Harbour (4.18 ± 0.56 to 5.55 ± 1.16 mm/year), compared to open water conditions at North Rock (2.53 ± 0.33 to 3.49 ± 0.68 mm/year). Some of these inshore extension rates also exceed those of the same contemporary species elsewhere in Bermuda and the Western Atlantic. Conversely, the extension rates of <em>Pseudodiploria strigosa</em> (2.71 ± 0.91 to 3.76 ± 0.68 mm/year), and the <em>Orbicella annularis</em> group (1.64 ± 0.32 to 2.75 ± 0.86 mm/year), are generally within the range of their contemporary counterparts in Bermuda but lower than those found in the Western Atlantic. Possible reasons for coral extension rate differences between locations including turbidity, water circulation, depositional energy, sediment-clearing abilities of corals, and temperature as well as relationship of coral extension growth to reef accretion are discussed.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"687 ","pages":"Article 113589"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-01Epub Date: 2026-01-31DOI: 10.1016/j.palaeo.2026.113610
N. Griffis , M. Dechesne , T. Smith , M. Hudson , C. Henderson , R. Mundil , M. Shinn , J.E. Birdwell , L. Pianowski , B. Lutz , C. Mercer , L. Morgan , L. Spangler
Cyclothems are defined by the repeat juxtaposition of littoral and open marine successions over short stratigraphic distances (meters to 10's of meters) and are interpreted to be driven by glacioeustatic forcing of sea level during the late Paleozoic Ice Age. The concept of cyclothems was defined in the Midcontinent region of the United States. However, correlating the Midcontinent region to other cyclic successions is difficult, which is the result of no geochronologic control for the Midcontinent biostratigraphic framework. We present the first high-resolution UPb zircon CA-ID-TIMS and feldspar 40Ar/39Ar age control for the onset of Midcontinent cyclothem deposition in the Arkoma Basin, Arkansas USA. Geochronologic control is obtained from a volcaniclastic unit preserved in the newly recovered Dare Creek #1 core. We integrate these data with biostratigraphic, lithostratigraphic and trace element analyses to investigate the timing, stratigraphic and geochemical response to late Paleozoic climate forcing. The lowermost Atoka Formation is associated with the onset of five high frequency transgressive-regressive cycles, which are defined by nearshore sandstones juxtaposed on top of offshore marine mudstones and are associated with changes in salinity and redox conditions. The Trace Creek Member of the lower Atoka Formation hosts a thick, organic-rich black shale, which defines the last and maximum transgression of the lower Atoka Formation in the Arkoma Basin, in the latest Bashkirian. Base-level records from time equivalent stratigraphic successions from Arrow Canyon, Nevada, U.S.A. and the Donets Basin, Ukraine also record a maximum transgression in the latest Bashkirian. The synchroneity of maximum flooding events from multiple basins which span the low latitudes in the latest Bashkirian support that cyclothem deposition was controlled by allostratigraphic forcing mechanisms, likely glacioeustatic forcing resulting from dynamic glaciation in high-latitude Gondwana.
旋流的定义是在短地层距离（米至10米）上沿海和开阔海洋序列的重复并置，并被解释为由晚古生代冰河期海平面的冰川静止强迫驱动。循环主题的概念是在美国大陆中部地区定义的。然而，将中大陆地区与其他旋回序列进行对比是困难的，这是由于对中大陆生物地层格架没有地质年代学控制的结果。本文首次对美国阿肯色州Arkoma盆地中陆旋回沉积的开始进行了高分辨率UPb锆石CA-ID-TIMS和长石40Ar/39Ar年龄控制。地质年代学控制来自新发现的Dare Creek #1岩心中保存的火山碎屑单元。我们将这些数据与生物地层、岩石地层和微量元素分析相结合，探讨了晚古生代气候强迫的时间、地层和地球化学响应。最下面的Atoka组与五个高频海侵-退回旋回的开始有关，这些旋回旋回由近岸砂岩并置在近海海相泥岩之上确定，并与盐度和氧化还原条件的变化有关。下Atoka组的Trace Creek段拥有一层厚的、富含有机物的黑色页岩，它定义了Arkoma盆地下Atoka组的最后一次和最大一次海侵。美国内华达州阿罗峡谷和乌克兰顿涅茨盆地等时间地层序列的基准面记录也记录了巴什基里亚晚期的最大海侵。最新巴什基里亚盆地中横跨低纬度的多个盆地的最大洪水事件的同步性支持旋回沉积是由异地层强迫机制控制的，可能是由高纬度冈瓦纳的动态冰川作用引起的冰川沉降强迫。
{"title":"Constraining the onset of carboniferous cyclicity in the Arkoma Basin of the Midcontinent, North America: Implications for calibrating a globally significant latest Bashkirian transgression","authors":"N. Griffis , M. Dechesne , T. Smith , M. Hudson , C. Henderson , R. Mundil , M. Shinn , J.E. Birdwell , L. Pianowski , B. Lutz , C. Mercer , L. Morgan , L. Spangler","doi":"10.1016/j.palaeo.2026.113610","DOIUrl":"10.1016/j.palaeo.2026.113610","url":null,"abstract":"<div><div>Cyclothems are defined by the repeat juxtaposition of littoral and open marine successions over short stratigraphic distances (meters to 10's of meters) and are interpreted to be driven by glacioeustatic forcing of sea level during the late Paleozoic Ice Age. The concept of cyclothems was defined in the Midcontinent region of the United States. However, correlating the Midcontinent region to other cyclic successions is difficult, which is the result of no geochronologic control for the Midcontinent biostratigraphic framework. We present the first high-resolution U<img>Pb zircon CA-ID-TIMS and feldspar <sup>40</sup>Ar/<sup>39</sup>Ar age control for the onset of Midcontinent cyclothem deposition in the Arkoma Basin, Arkansas USA. Geochronologic control is obtained from a volcaniclastic unit preserved in the newly recovered Dare Creek #1 core. We integrate these data with biostratigraphic, lithostratigraphic and trace element analyses to investigate the timing, stratigraphic and geochemical response to late Paleozoic climate forcing. The lowermost Atoka Formation is associated with the onset of five high frequency transgressive-regressive cycles, which are defined by nearshore sandstones juxtaposed on top of offshore marine mudstones and are associated with changes in salinity and redox conditions. The Trace Creek Member of the lower Atoka Formation hosts a thick, organic-rich black shale, which defines the last and maximum transgression of the lower Atoka Formation in the Arkoma Basin, in the latest Bashkirian. Base-level records from time equivalent stratigraphic successions from Arrow Canyon, Nevada, U.S.A. and the Donets Basin, Ukraine also record a maximum transgression in the latest Bashkirian. The synchroneity of maximum flooding events from multiple basins which span the low latitudes in the latest Bashkirian support that cyclothem deposition was controlled by allostratigraphic forcing mechanisms, likely glacioeustatic forcing resulting from dynamic glaciation in high-latitude Gondwana.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"687 ","pages":"Article 113610"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-01Epub Date: 2026-01-22DOI: 10.1016/j.palaeo.2026.113594
Zhixin Sun, Han Zeng, Fangchen Zhao
The large bivalved arthropods Isoxys and Tuzoia were widely distributed in Cambrian marine environments, occupying important evolutionary and ecological positions in early arthropod history. Here, we systematically studied middle Cambrian Isoxys and Tuzoia from four Burgess Shale-type Lagerstätten localities in the Mantou (Wuliuan) and Zhangxia (Drumian) formations of Shandong Province, North China. This study describes I. shandongensis Wang and Huang in Wang et al., 2010, I. longissimusSimonetta and Delle Cave, 1975, T. manchuriensis Resser and Endo in Resser, 1929, T. guntheriRobison and Richards, 1981 and a new species T. wudangshanensis sp. nov. The large bivalved arthropod assemblage from the upper Panchegou Member of the Zhangxia Formation (upper Drumian) represents the latest fossil record of Isoxys and Tuzoia worldwide. The first occurrences of I. longissimus and T. guntheri outside of Laurentia extend the known spatial and temporal distribution of these taxa, suggesting a strong paleobiogeographic affinity between North China and Laurentia.
大型双壳节肢动物Isoxys和Tuzoia在寒武纪海洋环境中广泛分布，在早期节肢动物历史上占有重要的进化和生态地位。在此基础上，系统研究了山东漫头组（五流组）和张夏组（Drumian组）四个伯吉斯页岩型Lagerstätten地区的中寒武统伊索索系和图索亚系。本文描述了I. shandongensis Wang and Huang in Wang et al., 2010， I. longissimus Simonetta and Delle Cave, 1975， T. manchuriensis Resser and Endo在Resser， 1929， T. guntheri Robison and Richards, 1981，以及一新种T. wudangshanensis sp. 11 .。来自张夏组上盘沟段（上Drumian）的大型双壳节肢动物组合代表了世界范围内Isoxys和Tuzoia的最新化石记录。在Laurentia外首次出现的I. longissimus和T. guntheri扩展了这两个分类群的已知时空分布，表明华北地区与Laurentia具有较强的古生物地理亲缘关系。
{"title":"Middle Cambrian large bivalved arthropods from Shandong, North China and their paleogeographic implications","authors":"Zhixin Sun, Han Zeng, Fangchen Zhao","doi":"10.1016/j.palaeo.2026.113594","DOIUrl":"10.1016/j.palaeo.2026.113594","url":null,"abstract":"<div><div>The large bivalved arthropods <em>Isoxys</em> and <em>Tuzoia</em> were widely distributed in Cambrian marine environments, occupying important evolutionary and ecological positions in early arthropod history. Here, we systematically studied middle Cambrian <em>Isoxys</em> and <em>Tuzoia</em> from four Burgess Shale-type Lagerstätten localities in the Mantou (Wuliuan) and Zhangxia (Drumian) formations of Shandong Province, North China. This study describes <em>I. shandongensis</em> Wang and Huang in <span><span>Wang et al., 2010</span></span>, <em>I. longissimus</em> <span><span>Simonetta and Delle Cave, 1975</span></span>, <em>T. manchuriensis</em> Resser and Endo in <span><span>Resser, 1929</span></span>, <em>T. guntheri</em> <span><span>Robison and Richards, 1981</span></span> and a new species <em>T. wudangshanensis</em> sp. nov. The large bivalved arthropod assemblage from the upper Panchegou Member of the Zhangxia Formation (upper Drumian) represents the latest fossil record of <em>Isoxys</em> and <em>Tuzoia</em> worldwide. The first occurrences of <em>I. longissimus</em> and <em>T. guntheri</em> outside of Laurentia extend the known spatial and temporal distribution of these taxa, suggesting a strong paleobiogeographic affinity between North China and Laurentia.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"687 ","pages":"Article 113594"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-01Epub Date: 2026-02-03DOI: 10.1016/j.palaeo.2026.113618
David A.T. Harper , Lucia Angiolini , Charles M. Henderson , Thomas Servais
A comment on our original paper (Davydov and Lucas, 2026) provided two examples (Devonian/Carboniferous and Permian/Triassic boundaries) to support the assertion that a volcanic ash and its radioisotope date would be the best primary marker for GSSP proposals and correlation. We demonstrate that precise correlation of the base Carboniferous and base Triassic requires the use of all stratigraphic markers including radioisotope dates where available. We reply that there is no practical way to correlate a numerical age in many sections, and that attempting to do so conflates the essential separation of rock and time. However, volcanic ash beds and their ages, are recognized as essential tools for calibration and to test correlations.
{"title":"Stability and precision in chronostratigraphic definition: The Global Stratotype Section and Point (GSSP) is the solution [Palaeogeography, Palaeoclimatology, Palaeoecology, volume 685, 113515]: Reply (Cementing the Golden Spike)","authors":"David A.T. Harper , Lucia Angiolini , Charles M. Henderson , Thomas Servais","doi":"10.1016/j.palaeo.2026.113618","DOIUrl":"10.1016/j.palaeo.2026.113618","url":null,"abstract":"<div><div>A comment on our original paper (<span><span>Davydov and Lucas, 2026</span></span>) provided two examples (Devonian/Carboniferous and Permian/Triassic boundaries) to support the assertion that a volcanic ash and its radioisotope date would be the best primary marker for GSSP proposals and correlation. We demonstrate that precise correlation of the base Carboniferous and base Triassic requires the use of all stratigraphic markers including radioisotope dates where available. We reply that there is no practical way to correlate a numerical age in many sections, and that attempting to do so conflates the essential separation of rock and time. However, volcanic ash beds and their ages, are recognized as essential tools for calibration and to test correlations.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"687 ","pages":"Article 113618"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-01Epub Date: 2026-01-31DOI: 10.1016/j.palaeo.2026.113611
Yuzhi Zhang , Mingrui Qiang , Jiawu Zhang , Xueyang Ma , Meidi Yin , Fengmei Ban , Feng Chen , Tianrun Wang
Understanding the driving mechanisms of dust storm variability on the Tibetan Plateau (TP) is crucial for clarifying the coupling of the Asian climate system. However, the long-term dust storm records with robust chronology and high-resolution were remain scarce across the TP, therefore, the driving mechanisms of the dust storm in the western TP during the Holocene are still unclear. Here we present a dust storm record covering the past 10,900 years from Aweng Co in the western TP, and the components, potentially induced by dust-storm process, in core sediments were extracted from the grain-size data of the sediment core by using standard deviation method, in conjunction with analyses of contemporary samples from both the lake surface sediments and the catchment deposits. The results show that dust storm activities were weaker from the early to mid-Holocene before 3.5 cal ka BP (1 ka = 1000 years), and strengthened rapidly afterwards. The high frequency and intensity of dust storm activity in the late Holocene was attributed to both reduced vegetation cover associated with decreased precipitation and strong wind regime. The latter was closely tied to the strengthened intensity and southward displacement of the westerlies, which was modulated by the Siberian High, the negative phase of North Atlantic Oscillation (NAO) and solar activity in the late Holocene. Furthermore, the dust storm activity in the late Holocene exhibited a periodicity of 13 years, 27 years and 216 years, suggesting that solar activity may have played a role in modulating the frequency of the dust storms in the western TP on the decadal-centennial scale.
了解青藏高原沙尘暴变率的驱动机制对阐明亚洲气候系统的耦合具有重要意义。然而，青藏高原上具有可靠年代学和高分辨率的长期沙尘暴记录仍然很少，因此，全新世青藏高原西部沙尘暴的驱动机制仍然不清楚。本文利用青藏高原西部阿翁公司近10900年的沙尘暴记录，结合湖泊表层沉积物和流域沉积物当代样品的分析，利用标准偏差法提取了岩心沉积物中可能由沙尘暴过程引起的成分。结果表明：在3.5 cal ka BP （1 ka = 1000年）之前，全新世早期至中期沙尘暴活动较弱，之后沙尘暴活动迅速增强；全新世晚期沙尘暴活动的高频率和高强度与植被覆盖减少、降水减少和大风状况有关。后者与全新世晚期西伯利亚高压、北大西洋涛动（NAO）负相和太阳活动调制的西风带强度增强和南移密切相关。此外，全新世晚期沙尘暴活动呈现出13年、27年和216年的周期性，表明太阳活动可能在10年-百年尺度上调节了青藏高原西部沙尘暴的发生频率。
{"title":"Holocene dust storm variability in the western Tibetan Plateau: Insights from Aweng Co sequential lake sediment","authors":"Yuzhi Zhang , Mingrui Qiang , Jiawu Zhang , Xueyang Ma , Meidi Yin , Fengmei Ban , Feng Chen , Tianrun Wang","doi":"10.1016/j.palaeo.2026.113611","DOIUrl":"10.1016/j.palaeo.2026.113611","url":null,"abstract":"<div><div>Understanding the driving mechanisms of dust storm variability on the Tibetan Plateau (TP) is crucial for clarifying the coupling of the Asian climate system. However, the long-term dust storm records with robust chronology and high-resolution were remain scarce across the TP, therefore, the driving mechanisms of the dust storm in the western TP during the Holocene are still unclear. Here we present a dust storm record covering the past 10,900 years from Aweng Co in the western TP, and the components, potentially induced by dust-storm process, in core sediments were extracted from the grain-size data of the sediment core by using standard deviation method, in conjunction with analyses of contemporary samples from both the lake surface sediments and the catchment deposits. The results show that dust storm activities were weaker from the early to mid-Holocene before 3.5 cal ka BP (1 ka = 1000 years), and strengthened rapidly afterwards. The high frequency and intensity of dust storm activity in the late Holocene was attributed to both reduced vegetation cover associated with decreased precipitation and strong wind regime. The latter was closely tied to the strengthened intensity and southward displacement of the westerlies, which was modulated by the Siberian High, the negative phase of North Atlantic Oscillation (NAO) and solar activity in the late Holocene. Furthermore, the dust storm activity in the late Holocene exhibited a periodicity of 13 years, 27 years and 216 years, suggesting that solar activity may have played a role in modulating the frequency of the dust storms in the western TP on the decadal-centennial scale.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"687 ","pages":"Article 113611"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-01Epub Date: 2026-01-20DOI: 10.1016/j.palaeo.2026.113577
Shaohua Yang , Shitao Chen , Yongjin Wang , Bin Zhao , Yijia Liang , Zhenjun Wang , Zhenqiu Zhang , Quan Wang , Qingfeng Shao , Lei Lu , Chuan-Chou Shen
Millennial-scale climatic variability during Marine Isotope Stage (MIS) 7.2 to 6.5, a period characterized by moderate global ice volume, remains poorly constrained due to limited high-resolution paleoclimate records. Here, we present a precisely dated, decade-resolution stalagmite oxygen isotope (δ18O) record from southern China, spanning 204.3 to 168.8 kyr BP and encompassing the late MIS 7.2 through early MIS 6.5 interval. Throughout this period, the Asian summer monsoon (ASM) closely tracked the insolation gradient between 30°N and 30°S on June 21 but was interrupted by eight distinct millennial-scale weak monsoon intervals (WMIs). These WMIs, centered at ∼169, ∼172.4, ∼174.6, ∼178.7, ∼180.4, ∼190.8, ∼195, and ∼ 203.4 kyr BP, align remarkably well with other high-resolution Chinese speleothem records, demonstrating widespread climatic instability despite moderate ice volume conditions. Significantly, a prominent hiatus lasting approximately 3300 years occurs at the depth of 282 mm within our stalagmite. This hiatus coincides precisely with a major WMI evident in other cave records and may be ascribed to an exceptionally weak Asian monsoon resulting in dramatically reduced stalagmite-forming precipitation. These WMIs are caused by ice drift debris (IRD) events caused by the rapid evolution of the ice sheet. Notably, our stalagmite record from the Asian monsoon region reveals a strong coupling with Antarctic temperature fluctuations via the bipolar seesaw mechanism, highlighting a significant influence of Southern Hemisphere climate dynamics on the ASM intensity. This observation further underscores the critical role of the inter-hemispheric insolation gradient in driving glacial/interglacial transitions. We tentatively propose that slowdowns in the Atlantic meridional overturning circulation (AMOC), triggered by freshwater fluxes into the North Atlantic, represent the primary forcing behind these abrupt climate events during MIS 7.2–6.5.
{"title":"Regular and mechanism of millennial scale weak monsoon events during the late MIS7 to early MIS6.5 period","authors":"Shaohua Yang , Shitao Chen , Yongjin Wang , Bin Zhao , Yijia Liang , Zhenjun Wang , Zhenqiu Zhang , Quan Wang , Qingfeng Shao , Lei Lu , Chuan-Chou Shen","doi":"10.1016/j.palaeo.2026.113577","DOIUrl":"10.1016/j.palaeo.2026.113577","url":null,"abstract":"<div><div>Millennial-scale climatic variability during Marine Isotope Stage (MIS) 7.2 to 6.5, a period characterized by moderate global ice volume, remains poorly constrained due to limited high-resolution paleoclimate records. Here, we present a precisely dated, decade-resolution stalagmite oxygen isotope (δ<sup>18</sup>O) record from southern China, spanning 204.3 to 168.8 kyr BP and encompassing the late MIS 7.2 through early MIS 6.5 interval. Throughout this period, the Asian summer monsoon (ASM) closely tracked the insolation gradient between 30°N and 30°S on June 21 but was interrupted by eight distinct millennial-scale weak monsoon intervals (WMIs). These WMIs, centered at ∼169, ∼172.4, ∼174.6, ∼178.7, ∼180.4, ∼190.8, ∼195, and ∼ 203.4 kyr BP, align remarkably well with other high-resolution Chinese speleothem records, demonstrating widespread climatic instability despite moderate ice volume conditions. Significantly, a prominent hiatus lasting approximately 3300 years occurs at the depth of 282 mm within our stalagmite. This hiatus coincides precisely with a major WMI evident in other cave records and may be ascribed to an exceptionally weak Asian monsoon resulting in dramatically reduced stalagmite-forming precipitation. These WMIs are caused by ice drift debris (IRD) events caused by the rapid evolution of the ice sheet. Notably, our stalagmite record from the Asian monsoon region reveals a strong coupling with Antarctic temperature fluctuations via the bipolar seesaw mechanism, highlighting a significant influence of Southern Hemisphere climate dynamics on the ASM intensity. This observation further underscores the critical role of the inter-hemispheric insolation gradient in driving glacial/interglacial transitions. We tentatively propose that slowdowns in the Atlantic meridional overturning circulation (AMOC), triggered by freshwater fluxes into the North Atlantic, represent the primary forcing behind these abrupt climate events during MIS 7.2–6.5.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"687 ","pages":"Article 113577"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146015898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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