Global and Planetary Change最新文献

{"title":"A central Tibetan highland during the Late Jurassic: Insights from sedimentology, provenance and detrital zircon trace element of the Xueshan Formation in the Qiangtang Basin","authors":"Jiawei Zhang ,&nbsp;Zhongpeng Han ,&nbsp;Yalin Li ,&nbsp;Jiarun Tu ,&nbsp;Jingen Dai ,&nbsp;Xingduo Ma ,&nbsp;Zijian Li ,&nbsp;Zhihao He ,&nbsp;Shuai Li ,&nbsp;Wenjun Bi","doi":"10.1016/j.gloplacha.2025.105268","DOIUrl":"10.1016/j.gloplacha.2025.105268","url":null,"abstract":"<div><div>Subduction-related crustal thickening and associated surface responses are key to understanding how continental interiors evolve into high plateaus. The Qiangtang Basin, as a major component of the proto-Tibetan orogenic system, preserves critical sedimentary and geochemical records of this transition. Here we integrate sedimentological, stratigraphic, petrographic and detrital zircon U<img>Pb and trace element data from the Late Jurassic-Early Cretaceous Xueshan Formation to reconstruct the paleogeography and crustal evolution of central Tibet. The Xueshan Formation comprises conglomerates, pebbly sandstones, mudstones, and minor limestones deposited in tidally influenced delta-fan delta environments, marking the transition from shallow marine to fluvial environments. Maximum depositional ages of 157–148 Ma indicate predominantly Late Jurassic sedimentation. Provenance analysis reveals that the Qiangtang Metamorphic Belt was the dominant sediment source, supplemented by variable input from the uplifted southern Qiangtang terrane, whereas the Hoh-Xil-Songpan-Ganze complex remained topographically stable. The youngest volcanic components were derived from Late Jurassic magmatic rocks. Detrital zircon Eu anomalies and whole-rock geochemistry indicate progressive crustal thickening of the source area from ∼50 to &gt;70 km between ∼168 and 145 Ma. This thickening and associated uplift reflect the transition from a plate-margin to an intracontinental orogenic regime, driven by flat-slab subduction of the Bangong-Nujiang Tethys lithosphere. The resulting topography established a proto-Tibetan highland that likely served as the headwater for transcontinental drainage toward Southeast Asia. These findings highlight that lithospheric reorganization and surface uplift within the Eurasian interior began prior to the Cenozoic India-Asia collision, offering broader insights into how deep Earth processes shape continental topography and global mountain-building systems.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105268"},"PeriodicalIF":4.0,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145823508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eastern Tethyan region periodic ecological collapse and recovery from Upper Triassic to Lower Jurassic","authors":"Rongjie Wang ,&nbsp;Shifeng Dai ,&nbsp;James C. Hower ,&nbsp;David French ,&nbsp;Ian T. Graham ,&nbsp;John Dodson ,&nbsp;Cortland F. Eble ,&nbsp;Jingjing Liu ,&nbsp;Zhengfu Zhao","doi":"10.1016/j.gloplacha.2025.105271","DOIUrl":"10.1016/j.gloplacha.2025.105271","url":null,"abstract":"<div><div>From the Upper Triassic to Lower Jurassic, ecological and climatic fluctuations linked to the Central Atlantic Magmatic Province (CAMP) and Angayucham Large Igneous Provinces (LIPs) were evident in the western Tethys. However, it remains unclear whether more distal Eastern Tethys regions from CAMP and Angayucham LIP were affected by its eruptions, as well as the Eastern Tethyan terrestrial ecological evolution processes, severity of collapse/recovery, and the driving mechanisms behind each collapse/recovery. This study focused on the Upper Norian to Lower Hettangian organic-rich peat layers deposited in the Sichuan Basin of the Eastern Tethys. Besides the global cooling and warming from LIPs effects, the distance between the both sides of the Tethys and LIPs influenced the impact of Hg on terrestrial vegetation. Distal volcanism caused Hg anomalies that postdate the ‘initial’ and ‘main’ carbon isotope excursions (CIEs), whereas proximal volcanism induced Hg anomalies preceding CIEs. The recovery processes consistently followed negative carbon isotope excursions. This is linked to mega-monsoons, which brought abundant moisture to the Tethys Sea coasts. Increased precipitation not only diluted toxic components but also transported nutrients into peat marshes, promoting terrestrial ecological productivity.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105271"},"PeriodicalIF":4.0,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145823507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ice sheet instability and meltwater events along the Svalbard–Barents Sea margin during the last 60,000 years","authors":"R.G. Lucchi ,&nbsp;C. Caricchi ,&nbsp;L. Sagnotti ,&nbsp;M.E. Musco ,&nbsp;G. Giorgetti ,&nbsp;R. Ventrice ,&nbsp;N. Douss ,&nbsp;F. Princivalle ,&nbsp;C. Morigi ,&nbsp;P. Macrì ,&nbsp;F.S. Gois Smith ,&nbsp;A. Caburlotto ,&nbsp;R. Geletti ,&nbsp;R. Romeo ,&nbsp;F. Zgur ,&nbsp;M. Rebesco","doi":"10.1016/j.gloplacha.2025.105261","DOIUrl":"10.1016/j.gloplacha.2025.105261","url":null,"abstract":"<div><div>Sediment drift records from the western Barents Sea–Svalbard margin provide key insights into the response of the marine-based paleo Svalbard–Barents Sea Ice Sheet (SBSIS) to climatic variability over the past 60 ky. Lithofacies characterization combined with clay mineral assemblages enables reconstruction of sediment provenance and depositional processes. Illite is ubiquitous and of limited provenance value, whereas smectite reflects input from the West Spitsbergen Current, chlorite records local ice streams draining through Storfjorden–Bellsund troughs, and kaolinite is linked to iceberg rafting from the Storbanken region following calving of the Bjørnøyrenna paleo-ice stream. The distribution of these minerals provides a robust proxy for SBSIS activity across central and western sectors.</div><div>Sedimentation rates, away from mass-transport deposits, were unexpectedly low during glacial periods but high during deglaciations and interglacials. Episodes of intensified sediment delivery reflect short-lived, widespread meltwater pulses. A notable H2-like layer deposited ∼24.8–23.5 ky, above Last Glacial Maximum mass transport deposits, documents a prominent meltwater event driven by increased Northern Hemisphere insolation. This event destabilized the fully expanded SBSIS in areas with deeply grounded ice streams and retrograde shelf morphologies, underscoring the ice sheet's sensitivity to atmospheric warming and ocean forcing.</div><div>Meltwater pulses profoundly affected the Arctic, enhancing water-column stratification, sea-ice expansion, organic matter accumulation, and bottom-water oxygen depletion, with implications for carbonate and magnetite diagenesis and for carbon storage in polar basins during glacial–interglacial transitions.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105261"},"PeriodicalIF":4.0,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145823789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Inferring Holocene air temperatures from vegetation-corrected land temperatures","authors":"Hongxuan Lu ,&nbsp;Weiguo Liu ,&nbsp;Huanye Wang ,&nbsp;Xingxing Liu ,&nbsp;Zeke Zhang ,&nbsp;Shugang Kang ,&nbsp;Yitao Liu ,&nbsp;Zheng Wang ,&nbsp;Weijuan Sheng ,&nbsp;Xu Liu ,&nbsp;Youbin Sun ,&nbsp;Zhonghui Liu","doi":"10.1016/j.gloplacha.2025.105266","DOIUrl":"10.1016/j.gloplacha.2025.105266","url":null,"abstract":"<div><div>Most geological materials record temperature changes at land/ocean surface rather than air temperatures. However, whether their long-term trends exhibit coherence during the Holocene remains debated. Here, we present brGDGT-derived land surface temperature (LST) variations over the past 25 kyr in the western Chinese Loess Plateau (CLP), revealing an overall Holocene cooling trend. Modern meteorological data indicate that surface conditions critically modulate regional LSTs, allowing the surface air temperatures (SATs) to be quantitatively estimated by incorporating vegetation cover and soil moisture. The reconstructed SATs show distinct early Holocene warming, mid-Holocene thermal maximum, and late Holocene cooling, aligning well with simulated SATs and global/regional temperature reconstructions. Our findings reconcile diverging LST and SAT trends through vegetation and moisture feedbacks, offering a new method to clarify land-air thermal interactions and improve proxy-model comparisons in paleoclimatology.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105266"},"PeriodicalIF":4.0,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145813961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Paleocene to Eocene deformation and crustal shortening history of the Tanggula Range, Central Tibet","authors":"Wenjun Bi ,&nbsp;Yalin Li ,&nbsp;Zhongpeng Han ,&nbsp;Chengshan Wang ,&nbsp;Jiawei Zhang ,&nbsp;Tiankun Xu ,&nbsp;Dawei Lv ,&nbsp;Chan Wang ,&nbsp;Zining Ma ,&nbsp;Haiyang He ,&nbsp;Huan Chen","doi":"10.1016/j.gloplacha.2025.105269","DOIUrl":"10.1016/j.gloplacha.2025.105269","url":null,"abstract":"<div><div>Understanding the timing and magnitude of deformation in the Tangula Range is crucial for elucidating the topographic growth of central Tibet. The Yanshiping region, located in the central Tangula Range, comprises Permian to Miocene sedimentary rocks that record the Tangula Range's deformational history since the Mesozoic. Our study presents new geological maps, balanced cross-sections, and low-temperature thermochronology results, shedding light on the deformational history of the Yanshiping region. The balanced cross-section reveals a north-verging fold–thrust belt accommodating at least 90 km of crustal shortening (&gt;49 %) post-Jurassic deposition. Sedimentological and thermochronological data suggest substantial crustal shortening occurred at 60–35 Ma, likely driven by the India–Asia collision and related continental subduction. Integrating our results with previous studies, we infer that central Tibet's topographic evolution included a broad Central Tibetan Valley during ∼96–60 Ma and a narrower valley during ∼60–35 Ma.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105269"},"PeriodicalIF":4.0,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145823511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tracing crustal thickness evolution of the Rodinia's peripheral orogens as recorded in the Yangtze Block, South China","authors":"Yiran Huang ,&nbsp;Junyong Li ,&nbsp;Xiaolei Wang ,&nbsp;Zhidong Gu ,&nbsp;Yue Guan","doi":"10.1016/j.gloplacha.2025.105267","DOIUrl":"10.1016/j.gloplacha.2025.105267","url":null,"abstract":"<div><div>The Tonian (ca. 1000–720 Ma) magmatic belts along the western and northern margins of the Yangtze Block represent critical components of the long-lived peripheral orogenic system of the Rodinia supercontinent. Reconstructing their crustal thickness evolution is essential for understanding Neoproterozoic paleotectonics and paleoenvironments. In this study, we integrate Eu/Eu*-in-zircon crustal thickness proxy with U-Pb-Hf-O isotopes from Late Tonian and Cryogenian strata to revisit Rodinia's peripheral orogenesis as recorded in the Yangtze Block, South China. The results indicate the average orogenic crust may have thickened from ∼40 to ∼60 km during ca. 1000–920 Ma. Zircons of this age mainly present positive ε_Hf(t) (+8.0 − +11.1) and mantle-like δ¹⁸O (4.80–6.33 ‰) values. Combined with geologic observations, this thickening may result from both juvenile magmatic addition and crustal shortening. During ca. 850–750 Ma, a period of significant flare-ups of continental arc magmatism occurred, the crustal thickness fluctuated slightly and stabilized around 50 km. Zircons from this interval exhibit highly variable ε_Hf(t) (−22.2 − +10.2) and δ¹⁸O (1.6–10.6 ‰) values, reflecting active crustal recycling and mantle-crust differentiation. The maintenance of constant average crustal thickness during this interval is interpreted as reflecting spatial asynchrony and/or frequent temporal switching between advancing and retreating accretionary orogenies. Besides, our findings support that the Tonian peripheral orogen of Rodinia represent a transitional phase in the evolution of both crustal thickness and geothermal gradients, bridging the subduction orogenic styles of the Mesoproterozoic and Phanerozoic eras.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105267"},"PeriodicalIF":4.0,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145823510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Abrupt provenance shifts in the northern South China Sea modulated by deep water current variability during the last deglaciation","authors":"Junzhe Wang ,&nbsp;Yanguang Dou ,&nbsp;Jingyi Cong ,&nbsp;Yong Zhang ,&nbsp;Xi Mei ,&nbsp;Xiaohui Chen ,&nbsp;Bin Zhai ,&nbsp;Houjie Wang","doi":"10.1016/j.gloplacha.2025.105263","DOIUrl":"10.1016/j.gloplacha.2025.105263","url":null,"abstract":"<div><div>The northern South China Sea (SCS) serves as a significant depositional sink for terrigenous river sediments. However, there is controversy over the main driving forces of sediment transport and provenance end-member contributions since the Last Glacial Maximum (LGM). This study integrates rare earth elements (REEs) and Sr<img>Nd isotope data from Core BY4 with a grain size end-member model to analyze the sediments' provenance contribution and dynamic evolution on the northern continental slope of the SCS since the LGM. The results indicate that since the LGM, the relative sediment contribution sourced from the western Taiwan rivers to the northern continental slope of the SCS accounts for 58 %–81 %, followed by rivers from Luzon Island. The variations in provenance contributions reflect the millennial-scale fluctuations in marine dynamic processes of the SCS. The strong deep water current during the LGM directly controlled the proportion of Taiwan-derived sediments, and the increase in sediments from Luzon Island since the middle Holocene indicates the strengthening of the Kuroshio Current. The sudden decline in Taiwan-derived contribution during the Heinrich I (H1) and the Younger Dryas (YD) indicates a weakening of the deep water current intensity in the SCS, which is inversely related to the strengthening of the North Pacific Intermediate Water (NPIW) in the subarctic Pacific. This study highlights the dynamic mechanism of the coordinated control of sediment transport by deep water current and the Kuroshio Current in the northern SCS, offering a new insight into the evolution of the source-to-sink system on the East Asian continental margin during the late Quaternary.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105263"},"PeriodicalIF":4.0,"publicationDate":"2025-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145785303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Two-dimensional lithospheric electrical structure and implications for the geodynamic process of the Western Kunlun Orogen","authors":"Munirdin Tohti ,&nbsp;Wenjiao Xiao ,&nbsp;Qigui Mao ,&nbsp;Miao Sang ,&nbsp;Zhiguo An ,&nbsp;Qingyun Di ,&nbsp;Yibo Wang ,&nbsp;Liang Zhao","doi":"10.1016/j.gloplacha.2025.105265","DOIUrl":"10.1016/j.gloplacha.2025.105265","url":null,"abstract":"<div><div>The Western Kunlun Orogen (WKO), located on the northwestern margin of the Tibetan Plateau, is considered as an accretionary orogen that preserves the entire tectonic evolution of the Tethyan oceans. Its Paleozoic to early Mesozoic orogenic history is crucial for reconstructing the Paleo-Asian plate, as it occupies a key tectonic position at the junction of the Pan-Asian and Tethyan tectonic domains. However, considerable dispute exists regarding its long-term orogenic process, particularly concerning the closure timings, positions, and subduction polarity of the Proto -Tethys and Paleo-Tethys Ocean in the WKO. The main cause of these controversies is the lack of a high-resolution lithospheric structure in this area. To clarify and gain deeper insights into the orogenic processes of Tethys, a 350-km-long Magnetotelluric (MT) profile, consisting of 32 broadband sounding stations, was deployed across the Tarim Basin (TB), Northern Kunlun Terrane (NKT), Southern Kunlun Terrane (SKT), Mazar Accretionary prism, and Karakorum Terrane (KKT) to collect field data for at least 36 h. Dimensionality analysis indicated that a 2D analysis was valid. The MT data were rotated to a 150° direction before inversion, based on an electrical principal strike analysis. The MT data were then imaged through a joint inversion of Transverse Electric Field (TE) and Transverse Magnetic Field (TM) modes using a nonlinear conjugate gradient (NLCG) algorithm. The resulting model provides crucial new constraints on the lithospheric structure beneath the WKO, revealing several distinct resistive anomalies. The bidirectional dipping geometry of these anomalies, integrated with geochronological and geochemical evidence, reveals two distinct subduction systems: one between the Northern and Southern Kunlun terranes, representing the subduction polarity of Proto-Tethys Ocean, and another between the Southern Kunlun and Karakorum terranes, recording the subduction process of Paleo-Tethys Ocean. Additionally, we interpret two resistive lower crust-uppermost mantle structures beneath the Mazar accretionary prism as a delaminated oceanic slab. Concurrently, a large, interconnected high-conductivity zone from the crust to the upper mantle is identified, likely reflecting partial melting due to asthenospheric upwelling triggered by Mid-Jurassic slab delamination. Furthermore, we propose that these pre-existing weak zones ultimately facilitated the Cenozoic deformation and uplift of the Kunlun Mountains during the ongoing India-Asia collision.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"258 ","pages":"Article 105265"},"PeriodicalIF":4.0,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145785308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pleistocene sediment transport dynamics in the western Arctic Ocean","authors":"Duanping Shi ,&nbsp;Wenshen Xiao ,&nbsp;Matt O'Regan ,&nbsp;Leonid Polyak ,&nbsp;Rujian Wang ,&nbsp;Li Wu ,&nbsp;Renhui Xu","doi":"10.1016/j.gloplacha.2025.105262","DOIUrl":"10.1016/j.gloplacha.2025.105262","url":null,"abstract":"<div><div>To investigate the Arctic Ocean response to Quaternary climate change (past ∼1.9 Ma), sediment transport and deposition was investigated in two sediment cores from the Canada and Makarov Basins using end-member modelling of grain size spectra. Four end-members were identified and interpreted as proxies for sea ice transport of sediments entrained by suspension freezing (clayey EM1) and anchor ice (coarse-silty EM3), near-bottom current transport (fine-silty EM2) and iceberg rafting (sandy EM4). Sea ice deposition from suspension freezing and anchor ice transport exhibit opposing long-term trends, with an overall decline in anchor ice. We infer that perennial sea ice expansion suppressed anchor ice but not suspended sediment transport. Interglacial conditions (enhanced ventilation, broader continental shelves) promoted anchor ice formation, whereas glacial environments limited overall sea ice sediment release. Near-bottom currents and iceberg transport are inversely correlated, with coarse ice rafted debris (IRD) peaking during glacial/deglacial periods. Iceberg transport proxies and sediment provenance indicate persistent circum-Arctic ice sheet expansion during the last ∼600–700 ka, after the Mid-Pleistocene Transition (MPT). These results are consistent with geological and modelling data for the Eurasian and North American ice sheet history. Iceberg transport also varied with changes in surface circulation. Anticorrelation with bottom currents indicates that periods of iceberg discharge suppressed deep-water convection, thus weakening bottom currents. These changes are linked to the overall intensification of the Pleistocene Northern Hemisphere glaciation. Massive glacial meltwater fluxes into the North Atlantic weakened the formation of the North Atlantic Deep Water (NADW), and thus the Atlantic Meridional Overturning Circulation (AMOC). The reduced northward heat transport enhanced perennial sea ice expansion and diminished near bottom current activity, as reflected in the Arctic Ocean sediment records.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105262"},"PeriodicalIF":4.0,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145785306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Intense wildfire response to Early Jurassic hyperthermal events with impact on floral turnover","authors":"Meng Li ,&nbsp;Yihong Liu ,&nbsp;Stephen P. Hesselbo ,&nbsp;Longyi Shao ,&nbsp;Micha Ruhl ,&nbsp;Wenjin Liu ,&nbsp;Di Gao ,&nbsp;Chao Liu ,&nbsp;Juan Wang ,&nbsp;Yonghong Li ,&nbsp;Weichao Wang ,&nbsp;Mingjie Li ,&nbsp;Jienan Pan","doi":"10.1016/j.gloplacha.2025.105256","DOIUrl":"10.1016/j.gloplacha.2025.105256","url":null,"abstract":"<div><div>Hyperthermal warming and biotic crisis occurred immediately before and during the Early Jurassic Toarcian Oceanic Anoxic Event (T-OAE) at ∼183 Ma. Wildfire episodes have been evidenced for hyperthermal events in the geological past which is associated with mass extinction. However, the impact of the T-OAE on wildfire occurrence and the processes that led to biotic crisis, especially floral turnover, are not yet well understood. Here we present high-resolution analyses of fossil charcoal, maceral inertinite, reflectance (R_o), and polycyclic aromatic hydrocarbons (PAHs) from the Pliensbachian–Toarcian interval, together with bulk organic carbon isotopes for the Dameigou section of the Qaidam Basin, China. These rocks record prominent changes before, during and after the T-OAE. Wildfire activity evolved from moderate low-temperature wildfires of the Pliensbachian, to intense high-temperature wildfires in the Early Toarcian, and to high-frequency but suppressed low-temperature wildfires in the Late Toarcian. These findings indicate that intense wildfires in the East Tethyan hinterland occurred during the Early Toarcian due to hyperthermal warming and aridity, probably linked to the intensive Karoo-Ferrar volcanism. The coincidence of the terrestrial floral turnover with intense wildfires in the Qaidam Basin suggest that wildfire during the Early Toarcian was one of the important factors governing the terrestrial biotic crisis. Further, widespread variegated rocks after the T-OAE in the East Tethyan inland basins indicate the scarcity of organic matter influx and, at least locally, there was a delayed recovery of land vegetation ecosystems. Our results imply that wildfire played an important role in both the deforestation and the later suppressed recovery of land plant ecosystems during the late Early Jurassic in the Qaidam Basin.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105256"},"PeriodicalIF":4.0,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145785307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}