Palaeogeography, Palaeoclimatology, Palaeoecology最新文献

{"title":"Precipitation changes in eastern Kazakhstan over the last 2200 years based on pollen records","authors":"Aizhi Sun ,&nbsp;Dongliang Zhang ,&nbsp;Junxing Du ,&nbsp;Xueyin Li","doi":"10.1016/j.palaeo.2025.113072","DOIUrl":"10.1016/j.palaeo.2025.113072","url":null,"abstract":"<div><div>Holocene climate archives from Arid Central Asia reveal significant spatial differences. In this paper, we analyse late Holocene pollen assemblages from the Kolbay Basin in eastern Kazakhstan, which show a transition in regional vegetation from steppe to desert over the last 2200 years. Quantitative reconstruction of mean annual precipitation (P_ann) using the weighted averaging partial least squares regression (WA-PLS) model has revealed that climate has experienced two relatively wet phases (270 BCE-450 CE and 750–1750 CE) and two relatively dry phases (450–750 CE and 1750 CE to present). We infer that the reconstructed P_ann value in the Kolbay Basin was chiefly influenced by large-scale mid-latitude westerly circulation and the North Atlantic Oscillation (NAO), as well as by the complex regional alpine geomorphology (Tianshan Mountains, Pamir Plateau) and different paths of water vapor transportation across different geographical regions.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"675 ","pages":"Article 113072"},"PeriodicalIF":2.6,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212912","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":"Evolution of dietary preferences of the Lophiodontidae (Mammalia, Perissodactyla) from Southern France","authors":"Manon Hullot ,&nbsp;Céline Robinet ,&nbsp;Quentin Vautrin ,&nbsp;Rodolphe Tabuce ,&nbsp;Pierre-Olivier Antoine ,&nbsp;Gildas Merceron ,&nbsp;Fabrice Lihoreau","doi":"10.1016/j.palaeo.2025.113076","DOIUrl":"10.1016/j.palaeo.2025.113076","url":null,"abstract":"<div><div>During the Eocene, the Lophiodontidae experienced an increase in body mass and a tendency towards the molarisation of the premolars, two phenomena often related with dietary changes. Although being amongst the largest herbivores of the European landmass at that time, the ecology of this successful perissodactyl family has rarely been investigated. This work is the first to take interest in the temporal evolution of dietary preferences of lophiodontids using enamel microstructure, dental mesowear and microwear (DMTA), in relation to body mass. We studied the Lophiodontidae (188 specimens) from seven Southern France localities dated from the early Ypresian (Mammal Palaeogene levels ]MP7–8 + 9[ interval, Palette), middle Ypresian (∼MP8 + 9, La Borie, Sainte-Eulalie), late Ypresian (∼MP10 Naples 2; ]MP10–11[interval, Aumelas), Lutetian (?MP11–12, Saint-Martin-de-Londres) and late Bartonian (MP16, Robiac; Last Appearance Datum of the family). Regarding enamel microstructure only <em>Lophiaspis maurettei</em> from Palette can be discriminated by its <em>Schmelzmuster</em>, with a large proportion of inner radial enamel, low decussation and straight Hunter-Schreger bands. The mesowear of the three oldest and smallest lophiodontids (85–350 kg) suggests similar browsing preferences, while the DMTA and microstructure exclude the consumption of abrasive and hard items. All proxies indicate tough foliage browsing, contrasting with the traditional view of all stem perissodactyls being frugivorous. Our results suggest that the younger and giant-sized <em>Lophiodon lautricense</em> (∼ 2300 kg) consumed more abrasive and harder items. Relative reduction of enamel thickness and increase in molarisation appears as a tentative dietary adaptation prior to the family extinction in relation with the MECO event.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"675 ","pages":"Article 113076"},"PeriodicalIF":2.6,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144221270","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":"Intertropical Convergence Zone modulates Asian dust input to the low-latitude western Pacific during the late Neogene","authors":"Hao Zheng ,&nbsp;Fuqing Jiang ,&nbsp;Yu Yan ,&nbsp;Xuguang Feng ,&nbsp;Zhifang Xiong ,&nbsp;Qi Jia ,&nbsp;Bingbin Qin ,&nbsp;Chuanliang Ren ,&nbsp;Zhaokai Xu ,&nbsp;Tiegang Li","doi":"10.1016/j.palaeo.2025.113074","DOIUrl":"10.1016/j.palaeo.2025.113074","url":null,"abstract":"<div><div>Asian dust is one of the primary components of detrital sediment in the tropical western Pacific. Whether low-latitude process influenced the Asian dust input to the low-latitude western Pacific during the late Neogene is still an open question. In this study, we analyzed the grain size composition of the detrital sediments and the radiogenic Sr and Nd isotopes of &lt;4 um components in the International Ocean Discovery Program Site U1490 in the western Pacific warm pool. By using Weibull function fitting, we quantitatively separated fine-grained endmember components (EM2) from the detritus. The results indicate that EM2 primarily originated from dust of the northern Chinese deserts and western and central Chinese deserts, and is transported by the East Asian winter monsoon and westerlies during the late Neogene. The mode grain size of EM2 became significantly coarser at 7.2–4.8 Ma and 3.9–2.6 Ma, most likely due to the enhancement of the atmospheric circulation. The significant increase in EM2 content at 7.2–4.8 Ma and 3.9–2.6 Ma is temporally consistent with the records of Asian aridity and the southward shifts of the Intertropical Convergence Zone (ITCZ). We argue that the deposition of Asian dust in the low-latitude Pacific was influenced not only by the climate (e.g. atmospheric circulation and aridity) of Asian continent, but also was modulated by the paleolocation of the ITCZ. As the major rainfall zone in the low-latitude Pacific, ITCZ influenced the diffusion and deposition of Asian dust. During the late Neogene, the southward shift of the ITCZ forced Asian dust to spread southward and resulted in more Asian dust deposition in the low-latitude western Pacific. Our study demonstrates the important role of low-latitude process on the deposition of Asian dust in the western Pacific during the late Neogene.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"675 ","pages":"Article 113074"},"PeriodicalIF":2.6,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144221269","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":"Long-term biotic responses and anthropogenic impacts in dryland lake ecosystems of northwestern China over the past two centuries","authors":"Lixiong Xiang ,&nbsp;Dongliang Zhang ,&nbsp;Wenjia Wang ,&nbsp;Muhammad Farqan ,&nbsp;Xueqing Song ,&nbsp;Chuangzi Yan ,&nbsp;Yuan Li ,&nbsp;Xuemei Chen ,&nbsp;Mingrui Qiang ,&nbsp;Guangjie Chen ,&nbsp;Ke Zhang ,&nbsp;Jianbao Liu ,&nbsp;Xiaohua Gou ,&nbsp;Erik Jeppesen ,&nbsp;Xiaozhong Huang","doi":"10.1016/j.palaeo.2025.113075","DOIUrl":"10.1016/j.palaeo.2025.113075","url":null,"abstract":"<div><div>In recent decades, lakes in arid central Asia have undergone severe ecological and environmental changes due to accelerated climate warming and intense human activities. However, there have been few studies that integrate multi-community dynamics, long-term historical trends, and drivers of ecological change, limiting our ability to effectively manage the evolution of these freshwater ecosystems. In this paper, we analyze high-resolution biotic proxies (subfossil cladocerans and diatoms) from Bosten Lake and Ailike Lake, northwest China, over the past two centuries, and compare these records with other lakes in the region to reveal changes in lake ecosystems. Our results indicate that natural climate variability was the primary driver of a first transition (∼1910 CE), whereas anthropogenic forcings predominantly drove a second transition (∼1960 CE) in these dryland lakes. After ∼1960 CE, planktonic eutrophic cladoceran species such as <em>Bosmina longirostris</em> and diatom species including <em>Fragilaria</em> cf. <em>crotonensis</em>, <em>Cyclotella atomus</em>, and <em>Cyclotella meneghiniana</em> became more dominant. Redundancy analysis and variance partitioning analysis suggest that changes in community assemblages were mainly driven by nitrogen loading (TN and/or δ¹⁵N), with additional influences related to lake productivity (Chl-a and TOC) and global warming. Furthermore, another shift in cladoceran composition in Bosten Lake, commencing ∼1990 CE, from large-sized <em>Daphnia</em> to small-sized <em>Bosmina</em>, was likely caused by increased predation pressure as result of the introduction of commercial fish farming. Our findings highlight the importance of understanding the complex interactions of lake ecological shifts with compounded stressors, both climate and anthropogenic forcings, for sustainable water management strategies, enhancing ecological resilience, and protecting freshwater ecosystems from further degradation.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"675 ","pages":"Article 113075"},"PeriodicalIF":2.6,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203325","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":"Mo-isotope constraints on the mid-Proterozoic ocean oxidation: Insights from the black shales of the ∼1.64 Ga Chuanlinggou Formation, North China Craton","authors":"Shuqi Liu ,&nbsp;Chaoyuan Jia ,&nbsp;Xiyan Zhu ,&nbsp;Wenbo Su ,&nbsp;Taiping Zhao","doi":"10.1016/j.palaeo.2025.113077","DOIUrl":"10.1016/j.palaeo.2025.113077","url":null,"abstract":"<div><div>Oxygen is a critical driver in the evolution of life on Earth. Current views suggest a persistently low oxygen level during the mid-Proterozoic, while more evidence points to episodic oxygenation events in this period, matching with remarkable biological evolution events. The ∼1.64 Ga Chuanlinggou Formation in the eastern North China Craton (NCC) offers a well-preserved fossil record of the earliest multicellular eukaryotes, and the first large-scale black shale occurrence since the late Statherian. This is correlated with contemporaneous black shales widely distributed in different cratons, reflecting a global geological event linked to the rifting of Columbia supercontinent. However, the redox conditions of the ocean system at that time remain unclear. In this study, we mostly present a multi-proxy geochemical dataset of the Chuanlinggou black shales, including molybdenum (Mo) concentration, Mo isotopic composition (δ^98/95Mo), and redox-sensitive trace elements (RSE, e.g., Mo, U, V), to quantify the redox state of the seawater during sedimentation. The whole-rock Mo concentrations of samples range from 0.19 ppm to 1.47 ppm and δ^98/95Mo from −0.01 ‰ to +1.42 ‰. An anomalous high Mo concentration (4.09 ppm) and high δ^98/95Mo (1.01 ‰) values were observed in the upper part of this sequence, corresponding with the high total organic carbon contents (TOC = 2.17 %) and enrichment factors of high Mo_EF (3.91), V_EF (0.88) and U_EF (1.35). This represents a redox condition closest to the euxinic state, which may imply an enhanced weathering effect. The Mo isotope mass balance modeling suggests a minimum seafloor oxidation area of ∼38 %. Alternatively, the maximum euxinic system could be limited to ∼45 %. We infer a short-lived oxygenation event during the early mid-Proterozoic, driven by increased nutrient fluxes resulting from the comprehensive effects of intensified rift volcanism, enhanced oxidative weathering and expanded accommodation space. It may have provided favorable environmental conditions for the landmark evolution of eukaryotes during that time.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"675 ","pages":"Article 113077"},"PeriodicalIF":2.6,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144221267","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":"Carbonate facies changes and Carbon isotope excursions across the Triassic-Jurassic transition (Lombardy Basin, Italy): Local effects or global changes?","authors":"V. Randazzo ,&nbsp;F. Berra ,&nbsp;G. Della Porta","doi":"10.1016/j.palaeo.2025.113061","DOIUrl":"10.1016/j.palaeo.2025.113061","url":null,"abstract":"<div><div>Global climatic, atmospheric and oceanographic changes may affect the Carbon cycle and be recorded in the C stable isotope signature of marine carbonate and terrestrial and marine organic matter deposits. Besides global events, δ¹³C excursions recorded in carbonate successions and organic matter-rich deposits may result from diverse local factors, masking or mimicking global C-cycle perturbations. Distinguishing the contribution of global C-cycle perturbations or local and regional sedimentary and environmental factors to the observed changes in the δ¹³C vertical trends is fundamental for the understanding of coupled sedimentological and geochemical studies. To delve into this issue, a previously well-studied, continuous carbonate succession across the Triassic-Jurassic transition in the Lombardy Basin (Southern Alps, N Italy) has been revisited investigating changes in facies association and variations of δ¹⁸O, δ¹³C_carb, δ¹³C_org and C/N (atomic) values. The Triassic-Jurassic transition witnessed a cascade of global environmental perturbations responsible for the End Triassic Extinction, triggered by the injection of volcanic CO₂ in the atmosphere from the Central Atlantic Magmatic Province. Besides the demise of Rhaetian biota, the studied carbonate succession is marked by abrupt facies changes: from marlstone-limestone cyclothems with corals, bivalves and foraminifers (Zu Limestone) to laminated calci-mudstone and marlstone (Malanotte Formation) overlain by progradational ooidal grainstone/packstone shoals (Albenza Formation). The δ¹³C_carb and δ¹⁸O values are within those expected from Rhaetian-Hettangian marine carbonates, but relationships between the δ¹³C_org and C/N curves suggest a possible influence by changes in the ratio of terrestrial vs. marine organic matter. The integrations of vertical facies superposition with the δ¹⁸O, δ¹³C_carb, δ¹³C_org values and C/N ratios are in tune in the three studied successions, suggesting possible alternative interpretations to global C-cycle perturbations. Changes in the δ¹³C_org values (in the range of ±1 ‰) may be explained by the variability of siliciclastic supply associated with different (terrestrial vs. marine) types of organic matter.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"675 ","pages":"Article 113061"},"PeriodicalIF":2.6,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144239815","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":"Continental red beds in the Ordos Basin (North China Block): Origins and paleoclimatic implications in the aftermath of the Jenkyns Event (Early Jurassic)","authors":"Yunwang Zhang ,&nbsp;Xin Jin ,&nbsp;Viktória Baranyi ,&nbsp;David B. Kemp ,&nbsp;Peijun Qiao ,&nbsp;Xianguo Lang ,&nbsp;Binbing Li ,&nbsp;Yuchao Chen ,&nbsp;Zhiqiang Shi","doi":"10.1016/j.palaeo.2025.113060","DOIUrl":"10.1016/j.palaeo.2025.113060","url":null,"abstract":"<div><div>The Jenkyns Event (also known as the Toarcian Oceanic Anoxic Event, ~183 Ma) was one of the most significant hyperthermal events of the Phanerozoic, associated with pronounced environmental and climatic perturbations. The event is characterized in the sedimentary record by a sharp negative carbon isotope excursion and widespread development of anoxic conditions in both terrestrial and marine settings. Following this negative carbon isotope excursion, red beds were deposited over a wide area in the inland Early Jurassic mega-lake systems of China (such as the Sichuan, Ordos, Qaidam, and Tarim basins). Given their widespread distribution, these red beds could hold clues for understanding the pathways by which the Earth system recovered from the Jenkyns Event, yet their origins, geological significance, and their relation to the event are largely unexplored. Here, petrographic, geochemical, mineralogical, and palynological analyses of the red beds have been conducted through the Fuxian Formation of the Anya section, Ordos Basin (North China Block). Paleoenvironmental proxies (Sr/Cu and Rb/Sr) indicate a predominantly semi-arid to semi-humid climate, albeit with oscillations, following the Jenkyns Event. The red beds exhibit characteristics of both primary and diagenetic control and were deposited in an oxidizing environment as indicated by redox indicators (U/Th, Ni/Co, and V/Cr). The sediments may have undergone secondary oxidation or reduction due to frequently fluctuating climatic conditions, resulting in the formation of variegated sediments. The lake was surrounded by a mire vegetation with ferns and lycopsids, but the riparian habitats were characterized by the presence of drier patches and pioneer plant types due to frequent fluctuations in the water level that prohibited the development of more complex lowland forests. Changes in the vegetation after the Jenkyns Event and the significant drop of regionally-sourced pollen types (produced by seed-ferns and conifers), indicate a drop in lake size and catchment area which were likely climatically driven. These climatic fluctuations may have been related to tectonism on the North China Block and the prevailing super-monsoon conditions. We further suggest that the drying climate and increased atmospheric oxygen may have collectively led to the development of red beds in the aftermath of the Jenkyns Event in major terrestrial basins in China.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"675 ","pages":"Article 113060"},"PeriodicalIF":2.6,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144253526","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":"Lower–Middle Triassic conodont biostratigraphy and evolution from South Tibet, China: Implications for global correlations","authors":"Ruoyu Bai ,&nbsp;Xu Dai ,&nbsp;Jing Chen ,&nbsp;Mingtao Li ,&nbsp;Fengyu Wang ,&nbsp;Li Tian ,&nbsp;Daoliang Chu ,&nbsp;Huyue Song ,&nbsp;Haijun Song","doi":"10.1016/j.palaeo.2025.113055","DOIUrl":"10.1016/j.palaeo.2025.113055","url":null,"abstract":"<div><div>Conodonts have played important roles in Triassic biochronology, providing a robust timescale for deciphering the mechanisms and patterns of the Permian–Triassic mass extinction and its subsequent recovery. Studies of Early–Middle Triassic conodonts in South Tibet are relatively scarce and lack high-resolution conodont biostratigraphies. In this study, we have presented 12 interval zones based on the collection, including 58 species in 16 genera of conodonts from three sections (Selong, Xialong and Gyanyima) in South Tibet. The <em>Clarkina taylorae</em> Zone, <em>Neoclarkina krystyni</em> Zone, <em>Novispathodus pingdingshanensis</em> Zone, <em>Triassospathodus homeri</em> Zone, and <em>Nicoraella germanica</em> Zone were first reported in South Tibet. In combination with previous work from the Neotethys, 12 Unitary Association zones (UAZs), comprising two Griesbachian, two Dienerian, four Smithian, and four Spathian UAZs, were recognized, seven of which were documented within South Tibet. Based on the new data from South Tibet, we have identified six stages in the evolution and diversification of the Early Triassic conodonts. Combining the new conodont biozones with published ammonoid UAZs and carbonate isotopic profiles provides a robust integrated Early Triassic stratigraphy, which enabled a more precise definition of the Induan–Olenekian boundary within the Neotethyan realm.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"675 ","pages":"Article 113055"},"PeriodicalIF":2.6,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195868","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":"Dismembered Guadalupian (Middle Permian) seamounts within the Yarlung-Tsangpo Suture Zone: Implications for the opening time of the Neo-Tethys Ocean","authors":"Hong-fu Zhou ,&nbsp;Yi-chun Zhang ,&nbsp;Mao Luo ,&nbsp;Xin Li ,&nbsp;Hua Zhang ,&nbsp;Hai-peng Xu ,&nbsp;Ruo-lan Liao ,&nbsp;Qi Ju ,&nbsp;Xiao-Hui Cui ,&nbsp;Jun-jie Liu ,&nbsp;Yao-feng Cai ,&nbsp;Shu-zhong Shen","doi":"10.1016/j.palaeo.2025.113063","DOIUrl":"10.1016/j.palaeo.2025.113063","url":null,"abstract":"<div><div>The opening time of the Neo-Tethys Ocean has been the subject of intense debates. In this paper, we document several exotic limestone blocks within the ophiolite mélange in the southern branch of the Yarlung-Tsangpo Suture Zone (Daba-Xiugugabu ophiolite subzone), which provide insights into the early evolution of the Neo-Tethys Ocean. The limestone blocks contain diverse fusulines such as <em>Neoschwagerina</em> and <em>Kahlerina</em> in the limestones in the Gyanyima area (Burang County) as well as <em>Codonofusiella</em>, <em>Lantschichites, Neoschwagerina</em>, <em>Chusenella</em>, <em>Yangchienia</em> and <em>Kahlerina</em> in the Zhalairi area (Zhongba County). These fusuline assemblages totally suggest a Middle Permian (late Guadalupian) age. The faunal characteristics of the fusulines indicate marine conditions that were warmer than the Gondwanan-type fauna in the Tethys Himalaya Terrane and the Zhongba-Zhada microcontinent, indicating that the limestone blocks were originated from a lower latitude to the north of the Gondwana continent. They further suggest that the limestone blocks are not in situ but derived from the obducted mélange from the ophiolites in the north of the Zhongba-Zhada microcontinent (Dajiweng-Saga ophiolite subzone), further suggesting a homology between the two ophiolite belts on both sides of the Zhongba-Zhada microcontinent. Considering the paleobiogeographic affinities and the data from paleomagnetic and geochemical studies of the associated basalt, it is proposed here that a seamount chain was developed in the Neo-Tethys Ocean during the late Guadalupian time, and that the Neo-Tethys Ocean had opened during the Early Permian (Cisuralian) times.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"675 ","pages":"Article 113063"},"PeriodicalIF":2.6,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184786","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 evolution of the Qiongzhou Strait between Hainan Island and mainland China: Evidence from geological drilling","authors":"Liyun Jia ,&nbsp;Yongyi Wei ,&nbsp;Lei Zhang ,&nbsp;Guoqiang Xu ,&nbsp;Dingyong Liang ,&nbsp;Chaoqun Wang ,&nbsp;Xiaoxiao Yang ,&nbsp;Xiumin Ma ,&nbsp;Dongxia Sun ,&nbsp;Daogong Hu","doi":"10.1016/j.palaeo.2025.113064","DOIUrl":"10.1016/j.palaeo.2025.113064","url":null,"abstract":"<div><div>The Qiongzhou Strait, situated between Hainan Island and mainland China, has experienced a complex late Cenozoic evolution involving successive phases of marine flooding and land bridge exposure. Its last Holocene phase of evolution is important for understanding regional tectonics, climate dynamics, and ancient human migration patterns. In this paper, we integrate drilling data, microfossil analysis, and AMS ¹⁴C dating, to show that coastal sedimentation established on both sides of the strait at ∼11.2 ka BP, and full east-to-west seawater flooding occurred at ∼9.0 ka BP. The strait's evolution comprised six phases: (1) A land bridge existed before ∼12.0 ka BP; (2) Seawater inundation of low-lying areas occurred at ∼12.0–11.2 ka BP; (3) Rapid sea-level rise and complete strait opening occurred during ∼11.2–9.0 ka BP; (4) Fluctuating sea-level rise, peaking 2–3 m above current levels and resulting in maximum strait width, occurred at ∼9.0–6.0 ka BP; (5) Sea-level regression and marine plain exposure occurred ∼6.0–1.0 ka BP; (6) Stabilized coastlines developed after ∼1.0 ka BP. These stages highlight the interplay between postglacial sea-level changes and regional tectonic subsidence, providing a framework for reconstructing paleoenvironmental shifts in the northern margin of the South China Sea. The development of full marine connection at ∼9.0 ka BP underscores the long-term importance of the strait's role as a hydrographic corridor through the Holocene.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"675 ","pages":"Article 113064"},"PeriodicalIF":2.6,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184784","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}