Palaeogeography, Palaeoclimatology, Palaeoecology最新文献

{"title":"Newly discovered Early to Middle Triassic Conodont faunas in the Shiquanhe area, western Lhasa Block, Xizang (Tibet) and their biostratigraphic and palaeobiogeographic implications","authors":"Gui-chun Wu ,&nbsp;Zhan-sheng Ji ,&nbsp;Gary G. Lash","doi":"10.1016/j.palaeo.2025.113209","DOIUrl":"10.1016/j.palaeo.2025.113209","url":null,"abstract":"<div><div>Conodonts have taken on a significant role in elucidating the sedimentary setting as well as geological history of the Lhasa Block (LSB) of Xizang (Tibet). Conodont biostratigraphic research indicates that the LSB was in carbonate platform setting rather than an emergent land mass during Triassic. Lower Triassic sedimentary successions of the LSB are classified as limestone-dominated and dolomite-dominated types. A relatively complete Early to Late Triassic conodont succession has been established for the limestone-dominated sections. In contrast, only a rough Early Triassic <em>Hadrodontina-Pachycladina</em> fauna has been described from dolomite-dominated sections. Our investigations of the dolomite-dominated type succession of the Shiquanhe area of the western LSB document for the first time three Early Triassic and two Middle Triassic conodont faunas. They are, in ascending order, the Late Griesbachian to Early Smithian <em>Hadrodontina</em> (revised from previously described <em>Hadrodontina-Pachycladina</em>) fauna, the Smithian <em>Pachycladina shiquania</em> n. sp. fauna, the Spathian <em>Triassospathodus homeri</em>-<em>Triassospathodus triangularis</em> Assemblage Zone, the Early Ladinian <em>Neogondolella transita-Neogondolella excelsa-Neogondolella cornuta</em> fauna, and the Late Ladinian <em>Budurovignathus</em> cf. <em>diebeli-Pseudofurnishius murcianus</em> fauna. The recovered Early to Middle Triassic conodont faunas permit more robust redefinition of the dolomite-dominated Triassic strata. Correlations of the conodont succession of the Shiquanhe area with those in other areas confirm that ellisoniids-bearing conodont successions existed preferentially along dolomite-dominated strata of low paleo-latitude. They also confirm that the Shiquanhe area had a closer relationship with Europe than with the western USA in palaeobiogeographic distribution in yielding the Lower Triassic species <em>Pachycladina</em> fauna and Ladinian species <em>Neogondolella excelsa</em> and a more diverse <em>Budurovignathus</em> species. Moreover, well-preserved platform-like elements of a newly described species <em>Pachycladina shiquania</em> n. sp. provide clarification of the true P₁ and P₂ elements of the <em>Pachycladina</em> apparatus.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"677 ","pages":"Article 113209"},"PeriodicalIF":2.7,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144867361","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":"Lopingian biotic crisis and global correlation: Evidence from the Abadeh section, central Iran","authors":"Dong-xun Yuan ,&nbsp;Yi-chun Zhang ,&nbsp;Mohammad N. Gorgij ,&nbsp;Hua Zhang ,&nbsp;Lucia Angiolini ,&nbsp;Gaia Crippa ,&nbsp;Jun Chen ,&nbsp;Shu-zhong Shen","doi":"10.1016/j.palaeo.2025.113211","DOIUrl":"10.1016/j.palaeo.2025.113211","url":null,"abstract":"<div><div>The Iranian tectonic blocks host well-preserved marine carbonate-dominated Lopingian (Upper Permian) strata, which have been proposed as one of the best international references for the Lopingian in the Tethyan Realm. However, the correlation of the Lopingian between Iran and other regions remains unresolved. The Abadeh section in central Iran is one of the most intensively studied Lopingian sections, yielding abundant conodonts, but with controversial taxonomy. This study presents an updated high-resolution Lopingian conodont succession from the Abadeh section. Fourteen conodont zones have been identified from the middle Abadeh Formation to the basal Elikah Formation, which can be well correlated with conodont successions from South China. Based on the lowest occurrences (LO) of <em>Clarkina</em> at the base of Unit 5 at the Abadeh section, the Guadalupian-Lopingian boundary (GLB) is within Unit 4b, much lower than that previously documented. The Wuchiapingian-Changhsingian boundary (WCB) is precisely constrained at 4.9 m below the top of the Hambast Formation. The Permian-Triassic boundary (PTB) is precisely constrained at 0.8 m above the base of the Elikah Formation. In addition, fusuline, ammonoid, and brachiopod biostratigraphy, as well as δ¹³C_carb, δ¹⁸O, and Sr isotope chemostratigraphy, and magnetostratigraphy of the Abadeh section, are reviewed. As a result, here an integrative multidisciplinary timescale for the Abadeh section has been established. This timescale provides a state-of-the-art temporal framework for both the regional and global correlation of the Lopingian. The integrative fossil ranges at the Abadeh section indicate that the hypothesized end-Guadalupian mass extinction displayed a gradually decline until the middle Wuchiapingian, suggesting a model of protracted ecological turnover rather than a distinct mass extinction event. Whereas, although most of the fossil ranges disappeared before the Changhsingian, the pattern of the end-Permian mass extinction at Abadeh is consistent with all other regions.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"677 ","pages":"Article 113211"},"PeriodicalIF":2.7,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144867360","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 insights into the community shifts of bivalves following the end-Permian mass extinction: New evidences from Guizhou, southwestern China","authors":"Tinglu Yang ,&nbsp;Huiting Wu ,&nbsp;Yang Zhang ,&nbsp;Jingqi Liu ,&nbsp;Anfeng Chen","doi":"10.1016/j.palaeo.2025.113208","DOIUrl":"10.1016/j.palaeo.2025.113208","url":null,"abstract":"<div><div>The Early Triassic provides crucial insights into the initial biotic recovery following the end-Permian mass extinction, the most severe biotic catastrophe during the Phanerozoic. This study presents the newly compiled bivalve data from the Lower Triassic of the Liuzhi and Bozhou sections. Based on multiple quantitative methods, five distinct ecological associations are recognized. The bivalve associations exhibit high level of spatial homogeneity with temporally equivalent bivalve faunas in taxonomic composition. The rapid diversification of cosmopolitan genus <em>Claraia</em> contributes to the significantly higher species diversity observed in <em>Claraia</em>-dominated associations. Despite the taxonomic changes, the trophic structure is not substantially altered, indicating the high resilience of bivalves to the complex abiotic and biotic conditions with strong capacity of niche filling. The high faunal homogeneity with contemporary communities and relatively simple trophic structure of the post-extinction bivalve associations identified herein are indicative of limited biotic recovery of level-bottom community in the studied sections.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"677 ","pages":"Article 113208"},"PeriodicalIF":2.7,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144867358","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":"Recovery of siliceous ecosystems promoted Early Silurian climatic cooling","authors":"Huan Xu ,&nbsp;Bo Ran ,&nbsp;Terry T. Isson ,&nbsp;Xinyang Chen ,&nbsp;Chao Luo ,&nbsp;Yi Li ,&nbsp;Yiqing Zhu ,&nbsp;Tong Sun ,&nbsp;Yuyue Han","doi":"10.1016/j.palaeo.2025.113206","DOIUrl":"10.1016/j.palaeo.2025.113206","url":null,"abstract":"<div><div>Throughout Earth's history, the delicate balance within the marine silicon cycle—between silicate weathering coupled to the formation of carbonate and chert versus reverse weathering—has been a fundamental driver of long-term climate stability. However, the ecological rise of siliceous organisms reduced the significance of this process in climate regulation during the Phanerozoic. Despite their importance, siliceous organisms are prone to diagenetic alteration, forming authigenic quartz, which makes direct study challenging. This study investigates Late Ordovician to Early Silurian marine mudstones, known for their richness in authigenic quartz, and uses high-precision scanning electron microscopy coupled with geochemical analyses. We find that the proportion of authigenic quartz (predominantly microcrystalline quartz) began to increase in the upper Hirnantian and reached a peak of 73.13 % in the Rhuddanian, exhibiting an inverse trend to previously reconstructed temperature variations. This microcrystalline quartz originates from the biogenic silica produced when siliceous organisms absorb dissolved silicon from seawater. Once deposited into sediment, it undergoes burial and dissolution, followed by nucleation and growth on micro-bleb (silicon-enriched extracellular polymers produced by microorganisms) surfaces or within locally supersaturated zones, eventually aggregating into ring-shaped clusters and aggregates. We speculate that the recovery of siliceous ecosystems in the Early Silurian provided sufficient silica for the formation of microcrystalline quartz, suppressing reverse weathering, which may have exacerbated or prolonged global cooling.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"677 ","pages":"Article 113206"},"PeriodicalIF":2.7,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144887307","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":"Sedimentary records reveal an early Cambrian active margin setting in the NW Yangtze Block, South China","authors":"Zhidong Gu ,&nbsp;Xing Jian ,&nbsp;Xiufen Zhai ,&nbsp;Xiaotian Shen ,&nbsp;Shuhuai Ye","doi":"10.1016/j.palaeo.2025.113207","DOIUrl":"10.1016/j.palaeo.2025.113207","url":null,"abstract":"<div><div>The Ediacaran to Cambrian sedimentary succession in the Yangtze Block (South China) has long been interpreted as forming in a passive margin setting. However, some recent studies on Cambrian geological records challenge this view. Here, we investigated a relatively complete Cambrian section in the central Longmenshan fold-thrust belt, NW Yangtze Block. Composed primarily of fine-grained siliciclastic rocks with subordinate carbonate rocks, this section was analyzed to constrain its depositional age, sedimentary environments, provenance and tectonic setting, and to address the ongoing controversies. The Cambrian succession exhibits coarsening-upward trends and indicates deep-water basin, slope and fan delta settings with hydrothermal inputs. The depositional ages were constrained as the Cambrian Terreneuvian to Epoch 2 interval (ca. 524–509 Ma), based on correlation of carbonate stable carbon isotope (δ¹³C) results with the global Cambrian δ¹³C reference curve and maximum depositional age constraints from detrital zircon U-Pb geochronology. Sandstones from the Qiongzhusi Formation have abundant volcanic lithic fragments and detrital zircons therein are dominated by Ediacaran–Cambrian ages. Nevertheless, sandstones from the Canglangpu Formation consist of various lithic fragments (including chert, metamorphic, volcanic and sedimentary clasts) and present diverse detrital zircon U-Pb ages (predominant 1000–500 Ma with minor 2600–2100 Ma). Both petrographic and geochemical results reveal that the Cambrian sediments are compositionally immature and were derived from proximal sources. Detrital zircon (635–500 Ma) trace elemental compositions denote a continental arc origin. Collectively, these results support proximal arc-related orogenic sources for the early Cambrian clastic sediments, contradicting previous proposals of distal orogenic sources. We propose that the Cambrian depositional succession was formed in an active margin setting in response to the Proto-Tethys Ocean subduction beneath the NW Yangtze Block. Our findings represent a significant advance towards understanding the Ediacaran–Cambrian transition and the role of the South China Craton in the Gondwana assembly process.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"677 ","pages":"Article 113207"},"PeriodicalIF":2.7,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144867437","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":"Dental microwear of cave bear (Ursus spelaeus) reveals locally adapted foraging strategies in South-Eastern Europe during late MIS 3","authors":"Paulo Duñó-Iglesias ,&nbsp;Iván Ramírez-Pedraza ,&nbsp;Florent Rivals ,&nbsp;Ionuț-Cornel Mirea ,&nbsp;Luchiana-Maria Faur ,&nbsp;Marius Vlaicu ,&nbsp;Theodor Obadă ,&nbsp;Roman Croitor ,&nbsp;Viorica Pascari ,&nbsp;Elena Delinschi ,&nbsp;Latinka Hristova ,&nbsp;Nikolai Spassov ,&nbsp;Marin Gospodinov ,&nbsp;Vesna Dimitrijević ,&nbsp;Sanja Alaburić ,&nbsp;Katarina Bogićević ,&nbsp;Ivan Stefanović ,&nbsp;Marius Robu","doi":"10.1016/j.palaeo.2025.113200","DOIUrl":"10.1016/j.palaeo.2025.113200","url":null,"abstract":"<div><div>Cave bears (<em>Ursus spelaeus</em> sensu lato) represent a remarkable example of Late Pleistocene megafauna, whose ecology and extinction dynamics remain a subject of intense debate. This study investigates the short-term dietary ecology of Late Pleistocene (mainly late MIS 3) South-Eastern European cave and brown bear populations (<em>n</em> = 316) using dental microwear analysis (DMA) on specimens from Romanian Carpathians (<em>n</em> = 160), Moldavian Plateau (<em>n</em> = 58), Western Balkans and Western Rhodopes (<em>n</em> = 65) and Central Balkans (<em>n</em> = 32). By analysing and quantifying microwear features, this research captures the final days-to-weeks dietary behaviour prior to death, offering a high-resolution perspective complementary to isotopic and morphological analyses. Complementing the prevailing view of cave bears as highly specialized herbivores, our results suggest a seasonal ecology more comparable to that of extant northern hemisphere ursids, characterized by landscape-based dietary opportunism. This inferred dietary flexibility is further supported by local-scale niche partitioning, and possible regional niche overlap with contemporaneous southern refugia dwellers <em>U. arctos</em> populations. Evidence of dietary flexibility, closely tied to their immediate environment, supported by new radiocarbon dates (<em>n</em> = 16), with the youngest at 35 ka cal BP (Butești), calls for a reassessment of cave bear extinction dynamics. Ecological specialisation, particularly during resource-scarce seasons and in refugia areas, combined with pre-hibernation ecological pressures, likely contributed to a gradual, multifactorial extinction process. This localized dietary endemism may have limited the species' ability to adapt when climatic conditions deteriorated during MIS 3.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"677 ","pages":"Article 113200"},"PeriodicalIF":2.7,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144867353","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":"Reduced mean annual precipitation immediately after the onset of the Paleocene-Eocene Thermal Maximum in the Bighorn Basin (Wyoming, USA)","authors":"Yanxiao Xu ,&nbsp;Chaowen Wang ,&nbsp;Kaipeng Ji ,&nbsp;Hanlie Hong ,&nbsp;Thomas J. Algeo ,&nbsp;Georgios E. Christidis ,&nbsp;Chenlei Zhao ,&nbsp;Lucas J. Lourens ,&nbsp;Philip D. Gingerich ,&nbsp;Hemmo A. Abels","doi":"10.1016/j.palaeo.2025.113205","DOIUrl":"10.1016/j.palaeo.2025.113205","url":null,"abstract":"<div><div>The Paleocene-Eocene Thermal Maximum (PETM) is used as a geological analogue for contemporary global warming driven by anthropogenic greenhouse gas emissions. Changes in the hydrological cycle during the PETM are debatable with large differences among geographical regions and as a function of proximity to the oceans. Here, we analyze multiple paleosol profiles through the PETM in the Bighorn Basin, Wyoming, located at mid-latitudes in the continental interior of North America. Temporally uniform detrital proxies (i.e., TiO₂/Al₂O₃, Zr/Hf, Nb/Ta and rare earth elements) indicate a stable source of detrital material before and during this event. However, paleosol profiles immediately following onset of the carbon isotope excursion (CIE) at the beginning of the PETM have significantly lower mean annual precipitation values. The chemical index of alteration (CIA) and K₂O/Al₂O₃ ratio indicate that chemical weathering during the early PETM phase was weaker than that in pre-PETM period and during the PETM recovery stage. Increasing coexistence of beidellite with montmorillonite as the main authigenic clay mineral points to more alkaline conditions, consistent with reduced precipitation and decreased intensity of chemical weathering. Our results make clear that precipitation was reduced with the onset of the CIE. Lower precipitation at the beginning of the PETM may have been a regional climatic feature specific to the Bighorn Basin or a more widespread response to contemporaneous global warming.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"678 ","pages":"Article 113205"},"PeriodicalIF":2.7,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144896733","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":"Dental mesowear patterns challenge the hypothesis of a 1.7 Ma transition to open grasslands in South Africa's Cradle of Humankind","authors":"Megan Malherbe ,&nbsp;Martin Haeusler ,&nbsp;Robyn Pickering ,&nbsp;Deano Stynder","doi":"10.1016/j.palaeo.2025.113199","DOIUrl":"10.1016/j.palaeo.2025.113199","url":null,"abstract":"<div><div>The assessment of palaeoenvironmental conditions in South Africa's Cradle of Humankind has traditionally relied on two main lines of evidence: the identification of fossil herbivore taxa and the stable carbon isotopic signatures preserved in their dental enamel. However, interpretations drawn from taxonomic composition often depend on taxonomic analogy – that is, the assumption that extinct species had similar diets and habitat preferences as their modern relatives. This assumption can be problematic as ecological roles can shift significantly over evolutionary time. Furthermore, many of these studies were conducted within broad chronological frameworks, which may obscure important temporal and spatial variability in vegetation structure. The traditional model is that the Cradle experienced a transition from woodlands to open grasslands around 1.7 million years ago. While foundational, this model rests on assumptions about ecological continuity and inexact chronological resolution that can mask finer-scale environmental differences. Here, we assess the hypothesis of an abrupt environmental shift at 1.7 Ma by comparing dental mesowear profiles across seven of the most important Cradle sites spanning the time period 3.2–1.3 Ma. These uranium‑lead dated sites are: Cooper's Cave, Drimolen, Haasgat, Hoogland, Malapa, Sterkfontein, and Swartkrans. We analysed mesowear signatures from fossil bovids (<em>n</em> = 623) across seven bovid tribes. All deposits exhibit similar mesowear scores, consistently reflecting a stronger grazing than browsing signal. Findings do not support a transition from woodlands to grasslands ca. 1.7 Ma. Instead, they are consistent with a heterogeneous landscape that remained unchanged from 3.2 to 1.3 Ma. We also identify variation in dietary ecology between members of the same tribe (e.g. Alcelaphini) in the same deposit (e.g. Swartkrans Member 2), indicating generalist tendencies among some tribes. Moreover, certain tribes (Tragelaphini, Reduncini, Antilopini) differ substantially in feeding preference compared to their modern counterparts. Our study highlights the importance of a regional approach to reconstructions of the South Africa Plio-Pleistocene, and the value of conducting such studies within an accurate, local and direct chronological framework.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"677 ","pages":"Article 113199"},"PeriodicalIF":2.7,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144828972","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":"Core-top constraints on the ecology and paleothermometry of planktic foraminifera in the Indian Ocean","authors":"Ryan H. Glaubke ,&nbsp;Elisabeth L. Sikes ,&nbsp;Natalie E. Umling ,&nbsp;Katherine A. Allen ,&nbsp;Matthew W. Schmidt","doi":"10.1016/j.palaeo.2025.113190","DOIUrl":"10.1016/j.palaeo.2025.113190","url":null,"abstract":"<div><div>The magnesium-to‑calcium ratio (Mg/Ca) of fossil foraminifera is a widely used geochemical proxy for reconstructing past ocean temperatures. Culturing experiments have shown that, for some species, nonthermal influences like salinity and carbonate chemistry play a non-trivial role in the incorporation of Mg into foraminiferal calcite. Inclusion of these variables into Mg/Ca calibrations have provided a better fit to core top and sediment trap data in some recent studies, but the widespread covariation of potential control variables in the open ocean and the lack of multivariate calibrations for some species warrants additional work. Here, we assess Mg/Ca calibrations for four common species of planktic foraminifera from the Indian Ocean: <em>Globigerinoides ruber</em> (white; sensu lato), <em>Globigerina bulloides</em>, <em>Globorotalia inflata</em>, and <em>Globorotalia truncatulinoides</em> (sinistral). Using a newly assembled database of paired Mg/Ca-δ¹⁸O observations from 115 Indian Ocean core tops, including 25 new observations from a 2018 cruise (CROCCA-2S), we build a multi-parameter environmental dataset informed by local constraints on each species' apparent calcification depth and growth season. We combine multivariate regression techniques with Bayesian factor analysis to develop several multivariate models and assess whether they improve model fit and performance over temperature-only equations. For <em>G. ruber</em>, the temperature-only model is the best empirical fit to our data (Mg/Ca = exp.(0.086*(T – 25)) + 1.49). Although we find a statistically significant relationship to seawater pH, its impact on estimated temperatures (± 0.65 °C per 0.1 pH unit) is smaller than the total uncertainty on the temperature-only model (±1.2 °C; 95 % CI). The Mg/Ca of <em>G. bulloides</em> is most reasonably described by a temperature-only model (Mg/Ca = exp.(0.068*(T – 25)) + 1.51). An apparent negative correlation between <em>G. bulloides</em> Mg/Ca and salinity is not consistent with prior culture and field studies, which have yielded only positive correlations (if any). This anomalous result is likely a byproduct of including core tops from the monsoon-sensitive Java/Sumatran coast. Finally, the Mg/Ca of subsurface-dwelling <em>G. inflata</em> and <em>G. truncatulinoides</em> fell within predicted ranges of some published calibrations, suggesting they might be effectively applied in this region. However, data for these two species were only available for cores from the southeast Indian Ocean where deep ocean mixing limits the dynamic range temperature, salinity, and other parameters across their habitat depth, preventing the creation of new, regionally robust calibrations. Overall, our work offers new calibrations for surface-dwelling species (<em>G. ruber</em> and <em>G. bulloides</em>) in the Indian Ocean and provides a framework for further refining multivariate controls on Mg/Ca of subsurface-dwelling species in the re","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"677 ","pages":"Article 113190"},"PeriodicalIF":2.7,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144828970","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":"Editorial preface to special issue: Paleoenvironmental changes along the Asian Continental margin over Neogene to recent timescales","authors":"Zhengquan Yao ,&nbsp;Shuqing Qiao ,&nbsp;Christophe Colin ,&nbsp;Yusuke Okazaki ,&nbsp;Yanguang Dou","doi":"10.1016/j.palaeo.2025.113189","DOIUrl":"10.1016/j.palaeo.2025.113189","url":null,"abstract":"<div><div>The Asian Continental Margin, comprising the northeastern Arctic margin, the western Pacific margin, and the northeastern Indian Ocean margin, forms the most extensive continental margin system on Earth. To advance the understanding of paleoenvironmental and paleoclimatic changes of this important region, this Virtual Special Issue (VSI) entitled <em>Paleoenvironmental changes along the Asian Continental Margin over Neogene to recent timescales</em>, brings together fifty-two contributions that span a broad temporal range. The papers are grouped into four major themes that address the evolution of the Asian Continent Margin: (1) Sediment source-to-sink processes and multi-scale paleoenvironmental evolution; (2) Sedimentary environments and their linkages to tectonic, climatic, and sea-level changes; (3) Sedimentary processes in Arctic and subarctic marginal seas and their implications for oceanic, cryospheric, and atmospheric systems; and (4) Organic carbon burial and the global carbon cycle. Employing a wide array of methodologies, including sedimentology, geochemistry, paleontology, mineralogy, and climate modeling, this VSI addresses environmental changes from tectonic to millennial and centennial timescales. The findings, not only, offer critical insights into past climatic system evolution, but also provide a valuable basis for predicting the future response of marginal marine systems to ongoing global climate change.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"677 ","pages":"Article 113189"},"PeriodicalIF":2.7,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144828973","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}