Palaeogeography, Palaeoclimatology, Palaeoecology最新文献

{"title":"Geochemistry of Mesozoic siliceous rocks in the Tongjiang accretionary complex of Northeast China: Implications for the evolution of the Paleo-Pacific subduction zone","authors":"Wen-Hao Zhang ,&nbsp;Jian-Bo Zhou ,&nbsp;Yuan-Lin Meng ,&nbsp;Wei-Bin Liu ,&nbsp;Dan-Dan Wang ,&nbsp;Xu-Feng Liu","doi":"10.1016/j.palaeo.2025.112999","DOIUrl":"10.1016/j.palaeo.2025.112999","url":null,"abstract":"<div><div>The subduction of the Paleo-Pacific Plate was an important tectonic feature of northeastern Eurasia in Mesozoic times. Owing to the great thickness of sedimentary cover, the nature of the tectonic units along the eastern edge of Eurasia remain uncertain. In this paper, we describe Mesozoic siliceous rocks from the Heitongdi 1(HTD-1) borehole in the Sanjiang Basin of northeast China to improve knowledge of the paleogeography and paleoenvironment of this region. Our study focuses on the genesis, sedimentary environment, and significance of these Mesozoic siliceous rocks, to provide insights into the subduction of the Paleo-Pacific Plate and the palaeoenvironment of northeastern Eurasia at this time. Geochemical indicators from the siliceous rock cores suggest a biogenic origin and formation in a continental margin arc environment. Our study provides evidence for the initiation of subduction of the Paleo-Pacific Plate beneath the Eurasian plate during the Early Jurassic, which led to the establishment of an island arc along the eastern margin of the Jiamusi Block. Our findings suggest that the suture zone between the Paleo-Pacific and Central Asian Orogenic Belt should be positioned west of Tongjiang, near the HTD-1 borehole, rather than along the Yuejinshan–Fuyuan fault as previously thought.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"672 ","pages":"Article 112999"},"PeriodicalIF":2.6,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143913140","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}

{"title":"Quantitative reconstruction of the temperature since the late Glacial using phytoliths from Hongyuan Peatland in the eastern Tibetan Plateau","authors":"Xiaomin Gao ,&nbsp;Tianlong Yan ,&nbsp;Xiaoshuang Sun ,&nbsp;Chun Wang ,&nbsp;Junjiang Dong ,&nbsp;Jinliang Liu","doi":"10.1016/j.palaeo.2025.112997","DOIUrl":"10.1016/j.palaeo.2025.112997","url":null,"abstract":"<div><div>The “Holocene temperature conundrum” remains unresolved, particularly in climate-sensitive regions like the Tibetan Plateau. Reconstructing Holocene temperatures, especially in such regions, provides unique insights into this unresolved issue and helps explore the mechanisms of temperature variability, which is essential for future climate predictions. To address these uncertainties, additional paleotemperature records are crucial. In this study, we quantitatively reconstruct the mean annual temperature (MAT) from the Hongyuan Peatland in the eastern Tibetan Plateau spanning 13,300 years, using phytoliths as a proxy—a method not previously applied in this area. Our reconstruction reveals a gradual warming trend throughout the Holocene, supported by model simulations and compiled results. Comparisons of temperatures with previous reconstructions from Hongyuan Peatland reveal that proxy seasonality influences temperature trends. Moreover, the calibration sets, the topsoil datasets, the characteristics of the proxies, and the model components can influence the amplitudes of temperature changes. Comparisons of phytolith-based temperature records across China show that Holocene temperature trends vary with latitude, which is related to annual insolation. In the eastern Tibetan Plateau, variations in MAT during the Holocene can be attributed to increasing mean annual solar radiation, rising CO₂ concentrations, and the melting of ice sheets. Our study assesses the potential of phytoliths as a reliable proxy for paleotemperature reconstruction in high-elevation areas and confirms the warming trend of MAT in the eastern Tibetan Plateau.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"672 ","pages":"Article 112997"},"PeriodicalIF":2.6,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143907993","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}

{"title":"The Thai-Malay Peninsula environmental changes following the 8.2 ka event based on multi-proxy analysis of a peat swamp core from southern Thailand","authors":"Jarunetr (Nadia) Sae-Lim ,&nbsp;Smith Leknettip ,&nbsp;Sakonvan Chawchai ,&nbsp;Natalie Dubois ,&nbsp;Jianghu Lan ,&nbsp;Liangcheng Tan","doi":"10.1016/j.palaeo.2025.112987","DOIUrl":"10.1016/j.palaeo.2025.112987","url":null,"abstract":"<div><div>The 8.2 ka event, the most abrupt climatic anomaly of the Holocene, disrupted global climate by weakening the Atlantic Meridional Overturning Circulation (AMOC) due to meltwater influx, triggering widespread climatic and environmental changes. While its impacts are well-documented in and around the North Atlantic, responses in Southeast Asia remain uncertain due to sea level fluctuations and limitations in existing paleoclimate data. This study presents a new multi-proxy analysis of a sediment core from the Kuan Kreng peat swamp forest in southern Thailand. Lithostratigraphy and geochemical analyses (total organic carbon and biomarkers) reveal environmental shifts between coastal lagoon and peat swamp ecosystems primarily driven by early- to mid-Holocene sea level changes. Our record delineates two distinct transitions: (1) from a marine-influenced lagoon to the onset of a peat swamp (8025 ± 20 yr BP) and (2) a subsequent return to lagoon conditions. Evidence based on <em>n</em>-Fatty Acid Methyl Ester (<em>n</em>-FAMEs) suggests that sea level regression due to the 8.2 ka event may have begun before the transition from lagoon to peatland indicated by lithostratigraphy. Branched-glycerol dialkyl glycerol tetraethers (brGDGTs) also indicate environmental changes and possibly cooler temperatures around 8.0 ka BP. Comparisons with published records from the Thai-Malay Peninsula refine the understanding of regional environmental changes, suggesting that the 8.2 ka event likely triggered a temporary regression at the study site, with variations in the monsoon intensity and ITCZ shifts playing a key role in hydroclimate changes.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"672 ","pages":"Article 112987"},"PeriodicalIF":2.6,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903771","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}

{"title":"Vegetation and climate record across the Carnian Pluvial episode from the Transdanubian Range, Hungary, Western Tethys","authors":"Viktória Baranyi ,&nbsp;Tamás Budai ,&nbsp;Viktor Karádi ,&nbsp;Xin Jin ,&nbsp;Wolfram M. Kürschner ,&nbsp;Emőke Tóth","doi":"10.1016/j.palaeo.2025.112989","DOIUrl":"10.1016/j.palaeo.2025.112989","url":null,"abstract":"<div><div>The Carnian Pluvial Episode (CPE) is one of the most extensively studied Triassic hyperthermal events that triggered biological turnovers both on land and in the marine realm. From a palynological perspective, the CPE is marked by a notable increase in the hygrophytic spore-pollen assemblages compared to the early Late Triassic. In the Transdanubian Range (Western Hungary), Carnian mixed clastic‑carbonate successions indicate a relatively wetter climate and elevated terrestrial input into the basins during the CPE. The quantitative and qualitative palynological data from three borehole successions provided insight into the Julian and early Tuvalian vegetation history of the study area. The new palynostratigraphical data refined the age constraints of the CPE deposits spanning from the late Julian to early Tuvalian correlated to the <em>Duplicisporites continuus</em> zone from the Alpine Realm. Palynological marker taxa characteristic for the middle to late Tuvalian were absent, confirming that the well-documented hiatus between the CPE deposits and the Main Dolomite extends over large parts of the Tuvalian. A complex interplay between regional and global processes influenced the palynological assemblages that responded to both eustatic sea-level changes and climatic fluctuations. The climate change in the Julian 2 was not uniform and seemingly expressed in the palynofloras of the Transdanubian Range with a delay due to transgression, as the palynological assemblage were still predominantly characterized by xerophytic conifer pollen in the pelagic depositional site in the early CPE phase, and even they might point to highly seasonal climate at the onset of the event inferred from the proliferation of the <em>Enzonalasporites</em> group. Hygrophytic vegetation elements such as spores and cycad-bennettite pollen peaked only in the late Julian 2. Variations in the relative abundance of spores, cycad-bennettite pollen and marine palynomorphs showed the combined effects of local sea-level changes and humid climatic episodes in controlling terrestrial influx from the latest Julian 2–Tuvalian onwards. The palynofloras point to aridification from later in the early Tuvalian, indicating the waning of the pluvial phase.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"671 ","pages":"Article 112989"},"PeriodicalIF":2.6,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899593","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}

{"title":"Trait-based approaches to paleoenvironmental reconstructions: What is in the community-weighted trait mean?","authors":"Indrė Žliobaitė ,&nbsp;A. Michelle Lawing","doi":"10.1016/j.palaeo.2025.112982","DOIUrl":"10.1016/j.palaeo.2025.112982","url":null,"abstract":"<div><div>Trait-based approaches to paleoenvironmental reconstructions offer a powerful framework for inferring past climates and environments. While analytical methods have advanced empirically, their evolutionary-theoretical basis is rarely explicitly incorporated into methodological developments. Here, we integrate trait-based palaeoecological modelling with the Law of Energy Equivalence that follows from the Red Queen's hypothesis to refine how community-weighted trait means are computed. Using traits from present-day large herbivorous mammalian communities, we test four methods of weighting community trait means – by species, relative abundance, biomass, and energy intake to predict annual precipitation, mean annual temperature, and terrestrial net primary productivity at the continental scale. Our results show that energy intake-weighted traits provide the most accurate predictions in most environments in line with theoretical expectations, closely followed by species-weighted mean traits, while relative abundance-weighted traits perform best in climatically extreme sites. Refining trait-based methodologies for paleoenvironmental reconstructions contributes to a broader understanding of ecosystem dynamics across time.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"672 ","pages":"Article 112982"},"PeriodicalIF":2.6,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903770","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}

{"title":"Rapid response of forest dynamics to strong seismic events in Jiuzhaigou Nature Reserve, eastern Tibetan Plateau over the last ∼ 1650 years","authors":"Hongyan Xu ,&nbsp;Youliang Bai ,&nbsp;Wei Shi ,&nbsp;Jiawei Fan ,&nbsp;Jie Du ,&nbsp;Xiaotong Wei ,&nbsp;Yanming Yang ,&nbsp;Siqi Zhang ,&nbsp;Qiaoqiao Guo ,&nbsp;Yanwen Wang ,&nbsp;Hanchao Jiang","doi":"10.1016/j.palaeo.2025.112981","DOIUrl":"10.1016/j.palaeo.2025.112981","url":null,"abstract":"<div><div>Understanding the ecological effects of strong earthquakes and post-seismic vegetation dynamics in mountainous areas is essential for mitigating post-earthquake disasters. Here, a detailed palynological and radiocarbon-dating study was carried out on the tufa sediments from Huohuahai Lake, Jiuzhaigou National Nature Reserve, China. Rapid transitions in palynological assemblages, from high contents of shrubs and herbs to <em>Quercus</em>, <em>Betula</em> and <em>Pinus</em> tree pollen, have repeatedly occurred over the past ∼1650 years. These short-term variations, combined with historical seismic records, probably record post-seismic (open forest) and inter-seismic (mixed forest) periods. Strong earthquakes caused damage to forests and induced hydrological changes, resulting in low pollen concentrations and increases in shrubs and herbs after such events. Subsequently, mixed coniferous broad-leaved forest gradually developed during inter-seismic periods. A particularly large earthquake occurred in ∼520 CE near Jiuzhaigou, and the vegetation recovery time from this was up to ∼214 years; this recovery time could also have been influenced by the sudden cooling and gradual drying climate and/or a previous strong earthquake. Our findings confirm the high seismic risk in the Min Shan uplift zone and the important driving force of tectonic activity on forest succession in mountainous areas.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"672 ","pages":"Article 112981"},"PeriodicalIF":2.6,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903676","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}

{"title":"Increase of organic carbon burial promoted the glacial decrease of atmospheric CO2: A case study from the Bengal-Indus fans","authors":"Bin Zhang ,&nbsp;Zhaokai Xu ,&nbsp;Zhaojie Yu ,&nbsp;Yifei Yang ,&nbsp;Shiming Wan","doi":"10.1016/j.palaeo.2025.112986","DOIUrl":"10.1016/j.palaeo.2025.112986","url":null,"abstract":"<div><div>Elucidating the burial mechanism of organic carbon (OC) in the Bengal-Indus Fans, the principal sink for weathering and erosion products from the Himalayas, is essential for deciphering the global carbon cycle and climate change. This study investigates the quantitative source-to-sink processes and controlling mechanisms of OC burial throughout Quaternary glacial-interglacial cycles using organic carbon isotope, total organic carbon content, mass accumulation rate, and a three-endmember mixing model to partition contributions from terrigenous C₃/C₄ plants and marine phytoplankton. The results indicate a significantly higher contribution of OC burial from C₄ plants during glacial periods, while C₃ and marine sources show opposing trends. Mass accumulation rates of terrigenous and marine OC increase during glacial periods and decrease during interglacials. Orbital variations in OC burial flux in the Bengal-Indus Fans are primarily influenced by glacial erosion of the Himalayas and monsoonal precipitation. Glacial erosion regulates the transport of terrigenous OC and nutrients to the ocean, thereby affecting marine primary productivity. Simultaneously, monsoonal precipitation influences plant composition in terrigenous regions and modulates the preservation efficiency of OC. Our calculations indicate that during glacial periods, the OC burial flux reached 0.8 × 10¹² mol/year. Assuming a total atmospheric CO₂ decline of ∼80 ppmv during glacials, this burial flux contributed approximately 5 % (∼4 ppmv) to the CO₂ drawdown, with marine OC accounting for 41–45 % of the total. These findings highlight the significant role of OC burial in the Bengal-Indus Fans in atmospheric CO₂ sequestration, thus contributing to global cooling during glacial periods.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"671 ","pages":"Article 112986"},"PeriodicalIF":2.6,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892308","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}

{"title":"Unlocking paleolatitudinal secrets of the early Cretaceous by rare earth element imprints: Implications for seawater chemistry, depositional environments, and paleoclimate in the Talhar Shale, Lower Indus Basin, Pakistan","authors":"Rizwan Sarwar Awan ,&nbsp;Bo Liu ,&nbsp;Hongxia Li ,&nbsp;Sajjad Ali ,&nbsp;Muhammad Amar Gul ,&nbsp;Lingsheng Zhao ,&nbsp;Ashar Khan","doi":"10.1016/j.palaeo.2025.112985","DOIUrl":"10.1016/j.palaeo.2025.112985","url":null,"abstract":"<div><div>The early Cretaceous in Pakistan facilitated the deposition of extensive shale deposits, notably the thick (∼70 m) Talhar Shale, which is widespread across the Lower Indus Basin (LIB) and is considered a significant hydrocarbon source with rich hydrocarbon potential. Despite its petroleum significance, the original seawater signatures of the Gondwana domain in the LIB remain underexplored. This research aims to fill this gap by using total organic carbon content and elemental geochemistry to present novel geochemical signatures that elucidate the paleodepositional history, sedimentary origin, paleoclimate, and tectonic framework of the Talhar Shale. Our results show moderately higher organic richness (average 1.81 wt. %), with total rare earth elements (ΣREE) averaging 284 ppm—exceeding various global shale deposits and the upper continental crust. Moreover, the weak correlations between key elemental proxies suggested a limited or no diagenetic impact on the REE of the Talhar Shale, making them reliable for paleoenvironmental interpretation. Elevated ΣREE values and lower Y/Ho ratios suggest warmer, more humid paleoclimatic conditions with freshwater influence during Talhar Shale deposition. From a global perspective, this suggests lower salinities at mid-latitudes and brackish conditions at higher latitudes and near the equator. This interpretation is further supported by narrow and stable δCe anomaly and Ce_Index indicate suboxic water conditions throughout the deposition, whereas more oxic conditions prevailed at the poles. Elevated LREE/HREE ratios and various trace elemental proxies imply a likely felsic origin for Talhar Shale, while paleotectonic discrimination highlights the complexity of the tectonic setting and demands a more comprehensive geochemical analysis. These findings justify the need for further exploration of the Talhar Shale to refine its palaeoenvironmental significance and broader implications on a global scale.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"671 ","pages":"Article 112985"},"PeriodicalIF":2.6,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899668","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}

{"title":"Holocene palaeoclimatic evolution in the North Ionian Basin of the Mediterranean Sea: A multiproxy approach","authors":"L. Bronzo ,&nbsp;A. Cascella ,&nbsp;S. Bonomo ,&nbsp;C. Morigi ,&nbsp;I. Cacho ,&nbsp;G. Margaritelli ,&nbsp;J. Frigola ,&nbsp;L.D. Pena ,&nbsp;F. Lirer","doi":"10.1016/j.palaeo.2025.112977","DOIUrl":"10.1016/j.palaeo.2025.112977","url":null,"abstract":"<div><div>We analyse the ND14Mbis gravity core obtained from the North Ionian Basin using a multi-proxy approach (calcareous nannofossils, planktonic foraminifera, geochemistry, X-ray fluorescence), to improve knowledge of Holocene palaeoclimatic and palaeoceanographic evolution. Wavelet analysis of the cold water coccolith species group (<em>Emiliania huxleyi</em> &gt; 4 μm and <em>Gephyrocapsa muellerae</em>) reveals a 1.6 ky periodicity, which closely matches the 1.5 ky North Atlantic Bond cycles. On shorter timescales, our high-resolution analysis allows the identification of major climatic events, including the latter part of the African Humid Period (10–5.4 ky BP) and the deposition of the Sapropel 1 interval (S1, 10–6.6 ky BP), as well as the Pre-Roman (4.1–2 ky BP), Roman (2–1.5 ky BP) and Post-Roman (1.5–0 ky BP) periods. During the African Humid Period, the S1 interval is clearly marked by the distribution of <em>Florisphaera profunda, Syracosphaera pulchra, Braarudosphaera bigelowii</em> and warm water taxa (<em>Calciosolenia</em> sp., <em>Discosphaera tubifera, Oolithot</em><em>us fragilis, Rhabdosphaera clavigera, Umbilicosphaera</em> sp. and <em>Umbellosphaera tenuis</em>), reworked coccoliths and XRF signals. Our findings show that S1 anoxic bottom-water conditions were interrupted during two short spells of climate cooling that coincide with the 8.2 and 7.4 ky BP climate events. Drier conditions developed at the end of the African Humid Period, with intermittent humid intervals. These episodes were likely governed by the negative shifts of the North Atlantic Oscillation system, whose influence progressively intensified after 4.2 ky BP, as reflected by the oscillations in holococcolith abundance and K/Al curves.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"671 ","pages":"Article 112977"},"PeriodicalIF":2.6,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899592","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}

{"title":"Asynchronous uplift of the South and Central Tian Shan in the Mesozoic: Insights from detrital zircon geochronology on the Southern Tian Shan Foreland Basin (NW China)","authors":"Kaixun Zhang ,&nbsp;Ronghu Zhang ,&nbsp;Zhiyuan He ,&nbsp;Tao Qian ,&nbsp;Qinglu Zeng ,&nbsp;Ke Wang ,&nbsp;Chao Li","doi":"10.1016/j.palaeo.2025.112980","DOIUrl":"10.1016/j.palaeo.2025.112980","url":null,"abstract":"<div><div>The Tian Shan orogenic belt, Earth's largest active intracontinental mountain belt, has experienced multiple reactivation and uplift events since its late Paleozoic amalgamation. However, the mechanisms driving these processes, as well as the relative uplift timing and rates of its secondary tectonic units, such as the South Tian Shan (STS) and Yili Block-Central Tian Shan (Yili-CTS), remain unclear. To investigate these issues, we analyzed detrital zircon U<img>Pb isotopic ages and heavy mineral assemblages from late Paleozoic to Cenozoic sedimentary rocks in the Southern Tian Shan Foreland Basin (STFB) using deep drilling samples. Our results document distinct detrital zircon responses to three major reactivation events during the Mesozoic–Cenozoic. In the late Triassic, detritus from the Yili-CTS first reached the STFB, likely due to enhanced erosion linked to a megamonsoon. By the early Cretaceous, the Yili-CTS had become a dominant sediment source, although its contribution declined in younger formations, indicating a delayed uplift of the STS relative to the Yili-CTS. These observations suggest that the Mongol-Okhotsk orogeny might trigger the early Cretaceous uplift of the Yili-CTS, with subsequent remote effects from the Lhasa–Qiangtang collision driving the STS’s uplift. Since the late Paleogene, uplift and shortening have been concentrated along the mountain front thrust-fold belts, blocking sediment transport from the Yili-CTS to the STFB, while tectonic quiescence in earlier periods allowed for increased contributions of the Yili-CTS-derived sediments, reflecting the overall planation of the Tian Shan. These findings provide new insights into the topographic evolution of the Tian Shan during multiple phases of intracontinental orogenesis and highlight the interactions between regional tectonics and far-field geodynamic forces.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"671 ","pages":"Article 112980"},"PeriodicalIF":2.6,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899667","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}