Palaeogeography, Palaeoclimatology, Palaeoecology最新文献_第4页

Climate change regulated carbonate production and accumulation in the Guaymas Basin over the past ca. 450,000 years

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-02-28 DOI: 10.1016/j.palaeo.2025.112864

Hong Peng , Yuchen Zheng , Meng Zhou , Yasu Wang , Lihua Ran , Han Jiang , Ligia Pérez-Cruz , Rafael Venegas , Tobias Höfig , Andreas Teske , Daniel Lizarralde , Kathleen Marsaglia , IODP Expedition 385 Scientist , Ying Cui , Shijun Jiang

Middle Pleistocene–Holocene sediment sequences were obtained during International Ocean Discovery Program Expedition 385 in the Guaymas Basin. However, the age model is not well constrained due to a lack of stratigraphic datums and suitable dating approaches for this time interval. In this study, we analyzed the sedimentary carbonate content (wt% CaCO₃) from Site U1546 as a proxy for biogenic carbonate production and compared it with the LR04 global benthic δ¹⁸O stack. The identification of 12 marine isotope stages from 21 correlation tie points establishes a refined chronology for the middle Pleistocene–Holocene sequence in the Guaymas Basin, and enables us to date the upper 354 m sediments back to ∼450 thousand years (kyr). Our data showed a broad range of wt% CaCO₃ values, from ∼0 % to 64.1 %, with an average of ∼16.7 %. The relatively low carbonate contents are primarily attributed to the dominance of siliceous diatoms over calcifying coccolithophores under eutrophic conditions, and organic matter remineralization further reduces carbonate preservation. Additionally, our research underscores higher wt% CaCO₃, linear sedimentation rates, and carbonate accumulation rates during interglacials compared to glacial periods, likely due to the preference of carbonate-producing coccolithophores for warmer temperatures. This suggests that climate change may have been the driver of the variation pattern of sedimentary carbonate content in the Guaymas Basin over the past ∼450 kyr. This study not only provides a refined chronology at multi-millennial time scale but also contributes critical data for cross-Pacific correlation with the Asian continental margins, enhancing the understanding of interactions between various climatic and oceanic processes on both regional and global scales.

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引用次数: 0

Foraminiferal assemblages from the Toarcian (Lower Jurassic) ‘Spotted limestone’ of the northern Adriatic Carbonate Platform

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-02-26 DOI: 10.1016/j.palaeo.2025.112841

Luka Gale , Rok Brajkovič , Adrijan Košir

The present study provides an in-depth study of foraminiferal assemblages from a Tethyan carbonate platform during the late Early Jurassic interval of environmental perturbations. The Toarcian succession from the Adriatic Carbonate Platform was investigated in two sections from Slovenia. In addition to detailed sedimentological and micropalaeontological analysis, carbon and oxygen isotope curves were produced. The succession starts with platform-top facies with abundant and diverse skeletal material, including lithiotid and megalodontid bivalves, dasycladacean algae, corals and sponges. Foraminifera are diverse and abundant, with larger benthic foraminifera (LBF) being the most commonly present. The shallow platform facies is followed by dark grey allodapic limestone, suggesting the formation of an intraplatform basin with restricted circulation of bottom waters. The composition of the transported material highlights the continuation of biotic carbonate production in the shallower parts of the platform. Deposition of the overlying ‘Spotted limestone’, thin-bedded laminated and bioturbated carbonate mudstone coincides with the negative carbon isotope excursion and the onset of the Toarcian Oceanic Anoxic Event (T–OAE). Foraminifera are represented by small lagenids and opportunists. No LBF were detected, and barren intervals are common. With the gradual return of carbon isotope values to less negative values, ooids and bioclasts are once again transported into the basin. The abundance and diversity of foraminifera return to pre-excursion levels, although with fewer species of LBF. The lower diversity of LBF could be related to environmental stress that affected the shallower parts of the platform during T–OAE, such as sea water warming and/or eutrophication.

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引用次数: 0

Rise and fall of archaeocyath reefs shaped early Cambrian skeletal animal abundance

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-02-26 DOI: 10.1016/j.palaeo.2025.112852

Sara B. Pruss , Emily F. Smith , Andrey Yu Zhuravlev , Rhiannon Z. Nolan , Tessa C. McGann

The Cambrian Explosion is a biodiversification event that involves numerous evolutionary innovations in the biosphere, including the establishment of nearly all marine invertebrate phyla, exploitation of the infaunal realm, and the expansion of skeletal elements as armor. The notable diversification of skeletons has been linked to predator-prey dynamics and the advent of new ecological niches, particularly the development of animal reefs built by archaeocyaths. While some have argued that the appearance and subsequent extinction of archaeocyath reefs was followed by a long-term delay in marine diversity, the influence of archaeocyath reefs on skeletal abundance both during and after their heyday has not been explored. Here, we review existing data and supplement it with new analyses from western Laurentia confirming the influence of archaeocyath reefs on animal abundance. During reef development, the reefs themselves were a locus for skeletal carbonate, but benthic communities adjacent to the reefs were also rich in skeletal taxa. Following the decline of archaeocyath reefs, skeletal abundance declined. The next true increase in animal abundance did not occur until Ordovician time. This work confirms that the influence of early animal reefs was ecologically far-reaching, providing habitat for numerous skeletal organisms. It is likely that the environmental stressors surrounding archaeocyath reef decline also affected other skeletonizing organisms, leading to an interval with fewer shelled animals, dominated by trilobites and echinoderms. This work confirms the broad ecological significance and importance of reef communities in the geologic past, acting as harbingers to the detrimental consequences of our modern reef crisis.

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引用次数: 0

Contrasting response in test size and abundance of planktic foraminifera Morozovella and Acarinina to the EECO in the subtropical Pacific Ocean

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-02-25 DOI: 10.1016/j.palaeo.2025.112840

Giulia Filippi , Daniela N. Schmidt , Silvia Sigismondi , Valeria Luciani

The EECO (∼53–49 Ma) is characterized by the highest global average temperature and CO₂ levels of the Cenozoic, providing the opportunity to explore the interplay between prolonged warmth, potential physiological stress, and marine planktic ecosystems, of which planktic foraminifera are a component. Previous studies have documented a dramatic decline in the dominant planktic foraminiferal genus Morozovella and a concurrent increase in Acarinina abundances at the onset of the EECO in the Atlantic, Tethys and Pacific Oceans. This study aims to investigate how extreme climatic conditions during the EECO influenced the abundance, size, and ecological strategies of planktic foraminifera, focusing on the response of the symbiont-bearing mixed-layer dweller Morozovella and Acarinina at Ocean Drilling Program (ODP) sites 1209–1210 Shatsky Rise, in the subtropical Pacific Ocean. We present species abundances, test size and δ¹³C data of Morozovella. Acarinina test size and δ¹³C data were quantified to assess whether observed changes affected all mixed-layer dwellers or were specific to Morozovella.

Our results show a temporary increase in Morozovella test size at the EECO onset, partially linked to the dominance of larger species such as M. crater and M. aragonensis. In contrast, Acarinina displays a reduction in test size. The generally lower δ¹³C values across the EECO in Acarinina suggest a deeper habitat in the mixed-layer and/or reduced symbiosis relative to Morozovella. We speculate that Acarinina evaded the high temperatures by moving deeper in the mixed layer. The reduced symbiosis relationship due to diminished light in the deeper water column might have led to a smaller test size. In contrast, Morozovella maintained a shallower position in the mixed layer allowing it to sustain efficient symbiosis and larger size. However, the limited ecological flexibility of this taxon may have impeded its ability to adapt and maintain high abundance across the EECO.

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引用次数: 0

Intensified glacial conditions drove the long-term decrease of the hematite content of Asian dust in an icehouse world

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-02-24 DOI: 10.1016/j.palaeo.2025.112834

Wenxiao Ning , Jinbo Zan , Xiaomin Fang , Jian Kang , Shuwen Wang , Zhe Hu

Hematite is one of the most stable and common iron oxides in rocks and soils worldwide. Hematite-contained atmospheric dust can affect the global climate by modulating radiative forcing and supplying iron to oceanic ecosystems. The Asian arid and semi-arid regions are one of the most important sources of atmospheric mineral dust in the Northern Hemisphere. Elucidating the spatial and temporal variations of the hematite content of Asian dust in the geological past can provide insights into ancient environments and climates. We conducted detailed diffuse reflectance spectroscopy analyses of the Pleistocene Tajikistan loess, combined with a synthesis of published hematite data for contemporaneous dust sequences in NW China. The results showed a consistent decrease in the hematite content of Asian dust encompassing both glacial and interglacial conditions throughout the Pleistocene. We conclude that intensified glacial conditions led to the decrease in the hematite content of Asian dust, via two dominant pathways: increasing sediment supply and decreasing land surface temperature. This decreasing hematite content of Asian dust may have important influences on the global climate by modulating radiative forcing and carbon cycle on geological time scales.

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引用次数: 0

Luminescence dating of core DLC70-2 from the North Yellow Sea in China and its implication for late Quaternary transgressions

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-02-24 DOI: 10.1016/j.palaeo.2025.112842

Nan Tang , Zhongbo Wang , Penghui Lin , Yuexin Liu , Zonghui Wu , Haozheng Tian , Xi Mei , Jun Sun , Jianghao Qi , Rihui Li , Shuyu Wu , Hongxian Chu , Zhongping Lai

Reliable chronology is crucial for reconstructing the sedimentary history and sea level fluctuations. However, the lack of robust ages for late Quaternary deposits on the North Yellow Sea (NYS) shelf hampered our understanding of its sedimentary processes. In this study, quartz optically stimulated luminescence (OSL) and feldspar post-infrared (IR) IR stimulated luminescence (pIRIR) dating protocols were utilized to establish a detailed chronostratigraphy for the upmost 30 m of core DLC70–2 from the central NYS. Based on lithology features and foraminifera assemblages, we identified three transgressive layers (T1, T2 and T3), corresponding to U1 (0–5.0 m), U3 (10.0–18.5 m) and U5 (23.3–30.0 m), respectively. In U1, two OSL and six radiocarbon ages of 4.9–10.3 ka indicate T1 deposition during Marine Isotope Stage (MIS) 1. For U2, three quartz OSL and one feldspar pIRIR ages ranging from >67 ± 7 to 45.1 ka suggest U2 deposition during MIS 4 - early MIS 3. However, due to quartz OSL signal saturation (D_e over 150 Gy), five OSL ages from U3 sediments only yield minimum ages of >73 ± 8 to >53 ± 4 ka. While the feldspar age of 76 ± 7 ka at 10.25 m in upper U3 indicates that T2 was formed no later than MIS 5. Significant underestimation in previous published ¹⁴C dates for pre-Holocene sediments was detected by cross-checking between OSL and ¹⁴C ages. In U5, a fading corrected feldspar age of 191 ± 17 ka at depth of 23.65 m suggests that T3 has formed at least during MIS 7. We reconstruct a comprehensive late Quaternary stratigraphy using ten cores obtained from the Bohai Sea (BS) and Yellow Sea (YS) and the current renewed chronostratigraphy of core DLC70–2. The occurrence of cold-water species Buccella frigida and Protelphidium tuberculatum during MIS 5 indicates there existed a cold-water mass (cyclonic eddy) similar to present-day marine circulation. Additionally, the late Quaternary stratigraphic correlation is supported by the previously chronostratigraphic reconstruction of coastal loess. These findings will enhance our comprehending on the sedimentary processes and their paleo-environment changes on the eastern Chinese shelves during late Quaternary.

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引用次数: 0

Quantitative reconstruction of Holocene hydroclimate changes in northeastern China and implications for East Asian monsoon dynamics

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-02-23 DOI: 10.1016/j.palaeo.2025.112833

Shi-Yong Yu, Runzhe Xu

The pattern of Holocene climate change remains unclear due to unresolved issues such as the “temperature conundrum” and the uncertain relationship between temperature and precipitation, particularly in monsoonal regions. Variability in regional climate drivers, including changes in ice volume, atmospheric circulation, and monsoon dynamics, further complicates Holocene climate dynamics, leading to spatially and temporally heterogeneous climate responses. As a result, reconstructing the precise timing, magnitude, and drivers of Holocene climate change remains challenging, requiring more detailed data and advanced statistical methods. In this study, we present a quantitative reconstruction of Holocene hydroclimate changes in northeastern China through a data-model fusion approach. By integrating water chemistry data from ostracod shells in a closed-basin lake with a hydrological balance model, we estimate growing-season temperature anomalies and relative lake-level changes during the Holocene. Our results highlight a mid-Holocene hydrological peak corresponding to the Holocene Thermal Maximum in the region. This peak lagged behind the early-Holocene summer insolation maximum, likely due to the influence of remnant ice sheets in the Northern Hemisphere. A comparison of our relative lake-level record with data of regional pollen-based precipitation reconstructions and TraCE-21 k modeling reveals a consistent pattern of increased monsoonal rainfall during the middle Holocene, followed by a steady decline after 5 kyr BP, reflecting a weakening of the East Asian summer monsoon. Additionally, our EOF analyses identify an early-Holocene tripolar precipitation pattern, which reversed in the middle Holocene, driven by shifts in atmospheric circulation. These findings advance our understanding of Holocene climate variability and offer insights for future climate predictions in monsoonal regions.

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引用次数: 0

Cenomanian-Turonian astronomical calibration and orbital forcing in Central Tunisia

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-02-23 DOI: 10.1016/j.palaeo.2025.112838

Ahmed Abdeldaim , Sherif Farouk , Wolfgang Ruebsam , Zaineb Elamri , Mohammad Alsuwaidi , Khaled Al-Kahtany

The Cenomanian to Turonian (C-T) transition marks a period of significant environmental disturbance characterized by shifts in climate, biogeochemical cycles, and ecosystems. During this time, marine ecosystems struggled to adapt to ocean oxygenation and nutrient availability changes. This study hypothesizes that Oceanic Anoxic Event 2 (OAE2) was driven by orbital influences from the 2.4 and 1.1 million-year g4-g3 eccentricity and obliquity cycles, respectively, during the C-T transition. These orbital factors probably contributed to contrasting climatic conditions, which played a crucial role in the impact on biogeochemical cycles and ecosystems. The astronomical calibration of the Oued Ettalla section reveals a period of 2.15 million years, from 94.73 to 92.58 million years ago. This newly established, astronomically-calibrated timeline, based on previously published data from the same section and samples, includes six calcareous nannoplankton bioevents, ten foraminiferal bioevents, and seven carbon isotope excursions, providing a refined temporal framework for understanding the paleoenvironmental changes. The different phases of OAE2 (a-d), distinguished by chemostratigraphic data occurred during a 0.8 million-year portion of the obliquity antinode modulation. The Lulworth carbon isotope event marks the onset of the Middle Turonian, while two 1.1 million-year obliquity modulations frame the Early Turonian. The Filament Event coincided with an eccentricity and obliquity node, which led to intensified summer insolation and increased ocean temperatures, supported by warm-water nannofossils.

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引用次数: 0

Palynological and geochemical evidence for East Asian monsoon evolution from the northern South China Sea during the middle to late Eocene

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-02-22 DOI: 10.1016/j.palaeo.2025.112837

Mengtian Gao , Li You , Gaowei Hu , Manuel Chevalier , Xiaohua Teng , Qi Feng , Yabing Chen , Feng Jin , Rui Yang , Jingyu Zhang

The evolution of the East Asian monsoon (EAM) profoundly affected the climate and environment of southeast China. This paper presents middle to late Eocene palynological records from the WC36-A borehole in the northern South China Sea (SCS) to improve understanding of EAM evolution and its driving mechanism during this key time interval. Findings reveal that vegetated landscapes transformed from mixed evergreen and deciduous broad-leaved forest in the middle Eocene to the mixed coniferous and broad-leaved forest ecosystem in the late Eocene. Furthermore, palynology-based CREST climate reconstructions suggest the existence of a subtropical monsoon climate and a modern-like EAM in the northern SCS region since the middle Eocene. Coupled with chemical weathering proxies, our analysis reveals the three-stage monsoon climatic evolution from cool-subhumid conditions to warm-humid conditions and then returning to cool-subhumid conditions. Our study suggests that the uplift of the Central-Southern Tibetan Plateau drove the EAM enhancement in the middle to late middle Eocene. The weakened EAM was likely caused by global cooling in the early middle and late Eocene and further promoted by the global sea level fall in the late Eocene. Our study proposes different interaction processes between forcing factors and provides new insight from the northern SCS to reconstruct the EAM evolution during the middle to late Eocene.

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引用次数: 0

Tibetan Plateau uplift intensified aridity in inland Asia: The role of the dust-ice cloud interaction feedback mechanism

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-02-21 DOI: 10.1016/j.palaeo.2025.112830

Jianing Guo , Xiaoning Xie , Hui Sun , Anqi Wang , Zhengguo Shi , Xinzhou Li

Geological evidence and numerical simulations indicate that the uplift of the Tibetan Plateau (TP) contributed to the formation of inland Asian deserts, and that the dust activity of the deserts affected local atmospheric circulation and the hydrological cycle through dust-radiation interactions. In this study, we conducted a series of sensitivity experiments using a global climate model to evaluate the impact of three forcing factors–TP terrain, dust direct effect, and dust-ice cloud interaction–on the climate evolution of inland Asia. The results show that TP uplift has a significant impact on drought in inland Asia (−175.5 ± 44.1 mm per year) by blocking water vapor transport from westerly winds through the plateau's dynamical effect throughout the year and inducing compensatory downdrafts due to the plateau's thermal effect in summer and autumn. The dust effect intensifies the regional drought by −27.7 ± 30.7 mm per year (particularly in spring and summer), mainly by suppressing atmospheric vertical convection through altering cloud microphysical processes. Our results suggest that the dust-ice cloud interaction provides a positive feedback mechanism for inland Asian aridity induced by the TP uplift.

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引用次数: 0