Palaeogeography, Palaeoclimatology, Palaeoecology最新文献

{"title":"Rise and fall of archaeocyath reefs shaped early Cambrian skeletal animal abundance","authors":"Sara B. Pruss ,&nbsp;Emily F. Smith ,&nbsp;Andrey Yu Zhuravlev ,&nbsp;Rhiannon Z. Nolan ,&nbsp;Tessa C. McGann","doi":"10.1016/j.palaeo.2025.112852","DOIUrl":"10.1016/j.palaeo.2025.112852","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"667 ","pages":"Article 112852"},"PeriodicalIF":2.6,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551584","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":"Contrasting response in test size and abundance of planktic foraminifera Morozovella and Acarinina to the EECO in the subtropical Pacific Ocean","authors":"Giulia Filippi ,&nbsp;Daniela N. Schmidt ,&nbsp;Silvia Sigismondi ,&nbsp;Valeria Luciani","doi":"10.1016/j.palaeo.2025.112840","DOIUrl":"10.1016/j.palaeo.2025.112840","url":null,"abstract":"<div><div>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 <em>Morozovella</em> and a concurrent increase in <em>Acarinina</em> 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 <em>Morozovella</em> and <em>Acarinina</em> 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 <em>Morozovella</em>. <em>Acarinina</em> test size and δ¹³C data were quantified to assess whether observed changes affected all mixed-layer dwellers or were specific to <em>Morozovella</em>.</div><div>Our results show a temporary increase in <em>Morozovella</em> test size at the EECO onset, partially linked to the dominance of larger species such as <em>M. crater</em> and <em>M. aragonensis.</em> In contrast, <em>Acarinina</em> displays a reduction in test size. The generally lower δ¹³C values across the EECO in <em>Acarinina</em> suggest a deeper habitat in the mixed-layer and/or reduced symbiosis relative to <em>Morozovella</em>. We speculate that <em>Acarinina</em> 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, <em>Morozovella</em> 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.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"666 ","pages":"Article 112840"},"PeriodicalIF":2.6,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Intensified glacial conditions drove the long-term decrease of the hematite content of Asian dust in an icehouse world","authors":"Wenxiao Ning ,&nbsp;Jinbo Zan ,&nbsp;Xiaomin Fang ,&nbsp;Jian Kang ,&nbsp;Shuwen Wang ,&nbsp;Zhe Hu","doi":"10.1016/j.palaeo.2025.112834","DOIUrl":"10.1016/j.palaeo.2025.112834","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"666 ","pages":"Article 112834"},"PeriodicalIF":2.6,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527012","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":"Luminescence dating of core DLC70-2 from the North Yellow Sea in China and its implication for late Quaternary transgressions","authors":"Nan Tang ,&nbsp;Zhongbo Wang ,&nbsp;Penghui Lin ,&nbsp;Yuexin Liu ,&nbsp;Zonghui Wu ,&nbsp;Haozheng Tian ,&nbsp;Xi Mei ,&nbsp;Jun Sun ,&nbsp;Jianghao Qi ,&nbsp;Rihui Li ,&nbsp;Shuyu Wu ,&nbsp;Hongxian Chu ,&nbsp;Zhongping Lai","doi":"10.1016/j.palaeo.2025.112842","DOIUrl":"10.1016/j.palaeo.2025.112842","url":null,"abstract":"<div><div>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 &gt;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 &gt;73 ± 8 to &gt;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 <em>Buccella frigida</em> and <em>Protelphidium tuberculatum</em> 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.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"666 ","pages":"Article 112842"},"PeriodicalIF":2.6,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512673","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 Holocene hydroclimate changes in northeastern China and implications for East Asian monsoon dynamics","authors":"Shi-Yong Yu,&nbsp;Runzhe Xu","doi":"10.1016/j.palaeo.2025.112833","DOIUrl":"10.1016/j.palaeo.2025.112833","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"666 ","pages":"Article 112833"},"PeriodicalIF":2.6,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510455","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":"Cenomanian-Turonian astronomical calibration and orbital forcing in Central Tunisia","authors":"Ahmed Abdeldaim ,&nbsp;Sherif Farouk ,&nbsp;Wolfgang Ruebsam ,&nbsp;Zaineb Elamri ,&nbsp;Mohammad Alsuwaidi ,&nbsp;Khaled Al-Kahtany","doi":"10.1016/j.palaeo.2025.112838","DOIUrl":"10.1016/j.palaeo.2025.112838","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"666 ","pages":"Article 112838"},"PeriodicalIF":2.6,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550455","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":"Palynological and geochemical evidence for East Asian monsoon evolution from the northern South China Sea during the middle to late Eocene","authors":"Mengtian Gao ,&nbsp;Li You ,&nbsp;Gaowei Hu ,&nbsp;Manuel Chevalier ,&nbsp;Xiaohua Teng ,&nbsp;Qi Feng ,&nbsp;Yabing Chen ,&nbsp;Feng Jin ,&nbsp;Rui Yang ,&nbsp;Jingyu Zhang","doi":"10.1016/j.palaeo.2025.112837","DOIUrl":"10.1016/j.palaeo.2025.112837","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"666 ","pages":"Article 112837"},"PeriodicalIF":2.6,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512671","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":"Tibetan Plateau uplift intensified aridity in inland Asia: The role of the dust-ice cloud interaction feedback mechanism","authors":"Jianing Guo ,&nbsp;Xiaoning Xie ,&nbsp;Hui Sun ,&nbsp;Anqi Wang ,&nbsp;Zhengguo Shi ,&nbsp;Xinzhou Li","doi":"10.1016/j.palaeo.2025.112830","DOIUrl":"10.1016/j.palaeo.2025.112830","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"666 ","pages":"Article 112830"},"PeriodicalIF":2.6,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487930","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":"Latest Oligocene (late Chattian) environmental transitions revealed by plant-insect interactions preserved in plant assemblages from Wind Brickyard, Eger, Hungary","authors":"Imre Gyökeres ,&nbsp;Benjamin Adroit ,&nbsp;Árpád Dávid","doi":"10.1016/j.palaeo.2025.112828","DOIUrl":"10.1016/j.palaeo.2025.112828","url":null,"abstract":"<div><div>Plants and insects are fundamental components of terrestrial ecosystems; evidence of their interactions (preserved as trace fossils on leaves) provides valuable insights into past environments. The Wind Brickyard succession in Hungary (Central Paratethys), of latest Oligocene age, offers a rare opportunity to study well-preserved evidence of plant-insect interactions and palaeoclimate across three plant-bearing intervals. Coinciding with the Late Oligocene Warming Event and the onset of the Miocene Glaciation, the Wind Brickyard assemblages capture palaeoecological responses to climate change, filling a critical knowledge gap in European palaeoecosystems. By integrating herbivory analysis and CLAMP-based palaeoclimate reconstructions, this study contributes to our understanding of how palaeoenvironmental and palaeoclimatic factors shaped latest Oligocene biodiversity over time. In this study, a total of 1310 fossil leaves from three different stratigraphic intervals were analyzed. Thirty-three, mostly generalized, damage types were documented. The greatest damage frequency and richness occurred in the upper of the three levels, which is represented by mainly azonal elements of riparian and swamp vegetation. This higher proportion of specialized insect damage is connected to elements of the zonal vegetation. These findings suggest that environmental changes and host plant zonality influenced the greater damage richness and frequency in the upper layer, highlighting significant ecological shifts close to the Oligocene-Miocene boundary.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"666 ","pages":"Article 112828"},"PeriodicalIF":2.6,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510449","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 coral reef carbonate REY geochemistry during the neomorphism from aragonite to calcite: A case study in the South China Sea","authors":"Wei Jiang ,&nbsp;Yuwen Xiao ,&nbsp;Kefu Yu ,&nbsp;Rui Wang ,&nbsp;Shendong Xu ,&nbsp;Ning Guo ,&nbsp;Tingwu Gu","doi":"10.1016/j.palaeo.2025.112835","DOIUrl":"10.1016/j.palaeo.2025.112835","url":null,"abstract":"<div><div>The geochemistry of rare earth elements and yttrium (REY with Y, REE without Y) in reefal carbonates is increasingly used to investigate both palaeoceanography and modern oceans. Nevertheless, the application of these methods to elucidate climate dynamics of the geologic past is limited by their vulnerability to diagenetic alterations. Given the meteoric transformation of aragonite to calcite, which represents an extremely unfavorable scenario for preserving the original marine signature, we focused on the REY geochemistry of a Holocene coral reef, obtained from Well CK2 in the northern South China Sea, which initiated at ⁓7.8 ka BP, but ceased to grow vertically at ⁓3.9 ka BP. The Holocene reefal carbonates have undergone neomorphism, transforming aragonite into calcite in a meteoric environment and enabling a direct comparison of REY distributions between the original aragonite and neomorphic calcite. Despite the preserved REY patterns of stabilized calcite closely mirroring those initially present in surface seawater, the ΣREE contents and Ce anomalies vary significantly, reflecting mixing of REY from reefal microbialites. Despite these disturbances, the Nd_N/Yb_N and Y/Ho ratios of Holocene reefal carbonates still demonstrate a highly conservative behavior during diagenesis. Our study indicates that the initial REY parameters, such as Nd_N/Yb_N and Y/Ho ratios, are frequently preserved in Holocene reefal carbonates, thus offering significant support for employing ancient marine limestones as indicators of marine REY geochemistry. Nevertheless, prudence is advised when utilizing ΣREE contents and Ce anomaly.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"665 ","pages":"Article 112835"},"PeriodicalIF":2.6,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143473895","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}