Global and Planetary Change最新文献

{"title":"Coronene spikes in the Ediacaran Doushantuo Formation, South China: A combustion origin?","authors":"Can Chen ,&nbsp;Jiasheng Wang ,&nbsp;Thomas J. Algeo ,&nbsp;Xiaohong Chen ,&nbsp;Kai Wei ,&nbsp;Zhou Wang ,&nbsp;Yongsong Huang ,&nbsp;Ganqing Jiang","doi":"10.1016/j.gloplacha.2025.104943","DOIUrl":"10.1016/j.gloplacha.2025.104943","url":null,"abstract":"<div><div>Paleo-wildfires evidenced by high contents of the polycyclic aromatic hydrocarbon coronene (C₂₄H₁₂), black carbon, charcoal, and inertinite are mainly known from strata younger than ∼430 Ma, following colonization of continents by vascular plants. One exception is a record of elevated coronene concentrations from Ediacaran strata in Australia, which have been interpreted as a product of wildfires ignited by a bolide impact (i.e., Acraman in South Australia). However, this inference is at odds with both the timing of terrestrial vegetation expansion and inferred atmospheric oxygen levels prior to the Phanerozoic, which are generally regarded as too low to have sustained wildfires. Here, we report two middle Ediacaran coronene spikes from the Doushantuo Formation in the Sixi section, South China. These coronene spikes may have an origin related to (1) aerosols generated by the Acraman impact and subsequently carried to South China by winds, or (2) ignition of a terrestrial microbial organic layer by regional volcanism or lightning strike. Our results are significant in demonstrating the presence of large amounts of coronene in Ediacaran strata of South China, making this the oldest known deposit having elevated coronene concentrations, with possible implications for the timing of onset of wildfires in Earth history. Similar to the transient “whiffs” of oxygen that characterized the otherwise anoxic conditions of the Late Archean world, we hypothesize that transient “blasts” of oxygen production occurred in the generally low-oxygen Late Neoproterozoic world.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104943"},"PeriodicalIF":4.0,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 eccentricity control on the clay minerals deposition in the northwestern Philippine Sea during the Miocene Climate Optimum","authors":"Chuanliang Ren ,&nbsp;Fuqing Jiang ,&nbsp;Xuguang Feng ,&nbsp;Yu Yan ,&nbsp;Hao Zheng ,&nbsp;Xiaojing Zhou ,&nbsp;Zhishun Zhang ,&nbsp;Zhigang Zeng","doi":"10.1016/j.gloplacha.2025.104938","DOIUrl":"10.1016/j.gloplacha.2025.104938","url":null,"abstract":"<div><div>The Miocene Climate Optimum (MCO, spanning 17–14 Ma) represents a notable warming phase within the overarching Cenozoic cooling trend. Nevertheless, the response of the western Pacific to this distinct climate change remains unclear. In this research, we analyzed clay minerals in sediment samples dating from 17.5 to 12.2 Ma, collected from Site U1438 in the Amami Sankaku Basin (ASB) during the Expedition 351 of the International Ocean Discovery Program (IODP). The finding indicated that during the MCO, smectite was the dominant clay mineral, accounting for approximately 88 %, followed by illite at around 10 %, with chlorite and kaolinite present in minor quantities. After the MCO, the proportion of smectite decreased to approximately 67 %, while those of illite (around 24 %), chlorite (around 5 %) and kaolinite (around 4 %) increased. Provenance analysis indicated that during the MCO, smectite primarily originated from the volcanic island arc in the northwestern Philippine Sea (NWPS), while illite and chlorite were derived from the Asian continent. The smectite/(illite+chlorite) (S/IC) ratio increased significantly during the MCO. This increase was consistent with the rise in low-magnetic susceptibility (χ_lf) in the Asian continent, as well as the increase in the smectite/illite ratio and the chlorite/(chlorite + hematite + goethite) (C_RAT) ratio in the South China Sea. These correlations imply that S/IC ratio is a sensitive indicator of the warm and humid climate during the MCO. Spectral and wavelet analyses further revealed a prominent 405-kyr cycle in the S/IC ratio during the MCO. The peak of this 405-kyr cycle in the S/IC ratio corresponded to the minimum long eccentricity and insolation, the maximum χ_lf and χ_fd/HIRM in inland Asia, and a positive deviation in deep-sea carbon and oxygen isotopes. During periods of long eccentricity minima, the cold climate, on one hand, caused the northern hemisphere westerly jet to shift southward. The westerly circulation then carried more moisture to the Asian continent, reducing the input of illite and chlorite. On the other hand, the cooler climate promoted the northward flow of the Circumpolar Deep Water (CDW). This brought more heat and dissolved matter to the deep North Pacific and enhanced the exchange of dissolved substances (such as oxygen and carbon dioxide) between the deep and surface waters of the Pacific Ocean. These processes strengthened deep-water ventilation in the NWPS, intensifying submarine weathering and increasing the supply of smectite. This study thus demonstrates the regulatory influence of long eccentricity on the climate and sediment supply from the mid-latitude Asian continent to the western Pacific during the MCO. These findings indicate that clay minerals can be used for astronomical calibration across geological periods.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104938"},"PeriodicalIF":4.0,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: Variability and driving mechanisms of Asian dust storms from the Holocene to the present","authors":"Jianbao Liu ,&nbsp;Mingrui Qiang ,&nbsp;Shugang Kang ,&nbsp;Shengqian Chen","doi":"10.1016/j.gloplacha.2025.104936","DOIUrl":"10.1016/j.gloplacha.2025.104936","url":null,"abstract":"<div><div>Asian dust storms are an integral component of the Earth's biogeochemical and climate systems, and they exhibit pronounced spatiotemporal variability shaped by complex atmospheric and surface processes. This Virtual Special Issue (VSI) explores the variability and underlying mechanisms of Asian dust storms on sub-orbital to decadal timescales through the Holocene, and comprises 20 interdisciplinary studies. In this editorial preface, we synthesize the key findings of these studies and contextualize them within broader climatic and environmental frameworks. The main insights are as follows: (1) Contemporary observations indicate a rapid increase in dust storms across the Mongolia-China border, and these phenomena now comprise a dominant component of East Asian dust storm activity. This trend is linked to enhanced Mongolian cyclonic systems, land surface degradation, and synoptic-scale atmospheric features such as cut-off lows. (2) Holocene reconstructions based on loess and lake sediment records reveal contrasting controls across regions. In humid East Asian monsoon zones, dust storms are primarily governed by hydroclimate and vegetation dynamics, whereas in arid regions—including arid Central Asia and the Tibetan Plateau—dust activity is predominantly modulated by wind regimes due to sparse vegetation cover. (3) Dust storm mechanisms vary across timescales; for example, dust activity on the Tibetan Plateau is driven by the westerlies on a millennial timescale, but it shifts to East Asian winter monsoon on the centennial timescale. Collectively, these findings highlight the importance of high-resolution archives and integrative approaches for resolving dust-climate interactions in the context of ongoing and future climate change.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104936"},"PeriodicalIF":4.0,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lithium isotopic constraints on systematic biases in reconstructing continental weathering processes from bulk sedimentary records at continental margins","authors":"Chengfan Yang ,&nbsp;Fang Cao ,&nbsp;Juan Xu ,&nbsp;Yi Lu ,&nbsp;Lei Bi ,&nbsp;Hongbo Zheng ,&nbsp;Shouye Yang","doi":"10.1016/j.gloplacha.2025.104942","DOIUrl":"10.1016/j.gloplacha.2025.104942","url":null,"abstract":"<div><div>Continental weathering plays a crucial role in regulating global climate, and siliciclastic sediments preserve valuable information for reconstructing terrestrial weathering and climate changes. However, few case studies focus on weathering signal propagation and possible alteration during complex source-to-sink processes at continental margins. In this study, elemental and lithium (Li) isotopic compositions of suspended particulate matter (SPM) in the Changjiang (Yangtze River) catchment and of Holocene sediments from Core MD06–3040 drilled from the East China Sea inner shelf are analyzed. δ⁷Li values of SPM range from −2.8 ‰ to −0.8 ‰, systematically lower than the core sediments (−0.5–0.7 ‰), despite their similar gain sizes as indicated by the Al/Si ratio. Evidenced by elevated Li/Al and δ⁷Li values, we infer that mineral differential setting physically alters particulate chemical compositions when SPM passes the estuary. This is further supported by a Li isotopic mass balance model, which quantitatively demonstrates a decline of weathering product by ∼15 % in core sediments relative to the riverine SPM. Additionally, variations of weathering products and igneous components in marine core sediments can be affected by the monsoon climate, further altering terrestrial weathering signals at continental margins. This study provides the first quantitative assessment of weathering signal modifications through applying Li isotopes during the sediment source-to-sink process, offering novel insights into the complex interplay of weathering processes and sedimentary dynamics at continental margins.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104942"},"PeriodicalIF":4.0,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144304951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatial-temporal isotope patterns in European winter precipitation reflect atmospheric circulation modes over North Atlantic and Arctic Oceans","authors":"Qiyao Fan,&nbsp;Zhongyin Cai,&nbsp;Rong Li,&nbsp;Cheng Wang,&nbsp;Songlin Yu,&nbsp;Xinyi Yu,&nbsp;Lide Tian","doi":"10.1016/j.gloplacha.2025.104940","DOIUrl":"10.1016/j.gloplacha.2025.104940","url":null,"abstract":"<div><div>To investigate the spatial and temporal modes in European winter precipitation isotopes and their climatic controls, we performed an empirical orthogonal function (EOF) analysis on the Piso.AI dataset, a recently released machine-learning-based monthly gridded precipitation isoscape across Europe. The first two EOF modes, EOF1 and EOF2, explain 56.83 % and 12.94 % of the total variance, respectively. EOF1 shows spatially uniform changes in δD, influenced by regional variations in temperature and water vapor transport. EOF2 reveals a dipole δD pattern between northern and southern Europe, reflecting regional differences in climate and moisture sources. These spatial-temporal patterns are corroborated by results from δ¹⁸O and isotope-enabled model simulations, enhancing the robustness of our findings. The Arctic Oscillation (AO) and North Atlantic Oscillation (NAO) significantly impact the first δD mode through their modulation of European temperatures and the strength of water vapor transport from lower latitudes, with a strong correlation of 0.86 for AO. The second mode captures unique climate variability independent of NAO and AO. These findings enhance understanding of atmospheric circulation and water vapor transport processes that control isotope changes across Europe. Furthermore, they offer insights into paleoclimate reconstruction, highlighting the potential for using spatially distributed isotopic records to reconstruct past AO activities. Additionally, they suggest the possibility of developing new climate reconstructions by leveraging the differences in isotopic signatures between northern and southern Europe.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104940"},"PeriodicalIF":4.0,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Millennial-scale episodic coral growth on the northern margin of the South China Sea","authors":"Yuyang Lin ,&nbsp;Tian-ran Chen ,&nbsp;Nicole D. Leonard ,&nbsp;Jian-xin Zhao","doi":"10.1016/j.gloplacha.2025.104937","DOIUrl":"10.1016/j.gloplacha.2025.104937","url":null,"abstract":"<div><div>Rising sea surface temperatures (SSTs) are exceeding the thermal tolerance of tropical corals, causing widespread bleaching and prompting attention to high-latitude subtropical regions as potential thermal refuge. To evaluate the past response of high-latitude reef growth to climate change, this study reconstructs the growth history around Daya Bay, located on the northern margin of reef-building corals in the South China Sea (SCS), since the mid-Holocene. Results from U<img>Th dates of 99 subfossil coral rubbles show coral ages range from 6808 ± 46 to −67 ± 8 years BP (before present, present = 1950 CE). These data demonstrate that coral growth may be episodic since the mid-Holocene, and three distinct periods of coral colonization have been revealed: the mid-Holocene (6280–5593 years BP), the late Holocene (3970–3657 years BP), and the Modern Era (−67–45 years BP). This episodic coral growth pattern is closely tied to warm climate conditions. Corals thrived mainly during the mid-Holocene, consistent with observations of mid-Holocene coral growth from other subtropical waters in the Western Pacific. Notably, although flourishing coral growth coincided with accelerated temperature increases in the latter half of the 20th century, highlighting the potential for high-latitude subtropical regions to serve as refuge for corals, there was a significant loss of coral cover and a shift in community structure. This emphasizes the urgent need to understand past coral dynamics and environmental interactions to inform conservation strategies and address ongoing coral degradation.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104937"},"PeriodicalIF":4.0,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144304952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reconstructing evolution of the western Equatorial Pacific and its thermocline dynamics since the latest Miocene","authors":"Ayushi Ram ,&nbsp;Anil K. Gupta ,&nbsp;Prasanta Sanyal","doi":"10.1016/j.gloplacha.2025.104939","DOIUrl":"10.1016/j.gloplacha.2025.104939","url":null,"abstract":"<div><div>The Western Equatorial Pacific (WEP) plays a critical role in modulating global climate by regulating heat transport and driving El Niño-Southern Oscillation dynamics through thermocline-mixed layer changes. Unlike Eastern Equatorial Pacific, where a shallow, nutrient-rich thermocline drives productivity, factors governing thermocline dynamics and productivity shifts in the WEP remain less understood. This study presents planktic foraminiferal faunal and stable isotope data from ODP Site 803D to investigate the paleoceanographic evolution of the WEP since ca. 6.5 Ma. During the latest Miocene, the WEP experienced cooling of the upper water column and a decrease in productivity. This trend reversed in the early Pliocene when a warming phase initiated, marking the onset of permanent El Niño conditions in the Pacific. Afterward, the WEP experienced cooling concomitant with thermocline shoaling and increased productivity owing to the influence of southern-sourced intermediate waters. Such incursions of southern-sourced waters established a link between high latitude processes and tropical dynamics. Subsequently, the mixed layer in this region thickened due to the constriction of the Indonesian Gateways. We suggest that the modern-day Western Pacific Warm Pool began to emerge between 2.2 and 2.0 Ma, as simultaneous mixed layer warming and upper thermocline cooling initiated a new vertical thermal stratification. By 2.0 Ma, the study region attained present-day oligotrophic setting, driven by low input from the Southern Ocean and increased upper ocean thermal stratification. Our findings highlight the dynamic interplay between tropical ocean gateways, high-latitude influences, and ocean-atmosphere feedbacks in shaping the long-term evolution of thermocline structure and productivity in the WEP.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104939"},"PeriodicalIF":4.0,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144281101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Asymmetric Pacific variability in the Pliocene: An unchanged PDO relative to a suppressed ENSO","authors":"Katya V. Canal-Solis ,&nbsp;Julia C. Tindall ,&nbsp;Arthur M. Oldeman ,&nbsp;Alan M. Haywood ,&nbsp;Ayako Abe-Ouchi ,&nbsp;Michiel L.J. Baatsen ,&nbsp;Wing-Le Chan ,&nbsp;Ran Feng ,&nbsp;Stephen J. Hunter ,&nbsp;Xiangyu Li ,&nbsp;Christian Stepanek ,&nbsp;Zhongshi Zhang","doi":"10.1016/j.gloplacha.2025.104932","DOIUrl":"10.1016/j.gloplacha.2025.104932","url":null,"abstract":"<div><div>Currently, the El Niño Southern Oscillation (ENSO) dominates the climate variability in the Pacific basin, while the Pacific Decadal Oscillation (PDO) is the second dominant mode of variability. Both modes of variability are crucial due to their global roles. However, the response of PDO and ENSO to changes in forcing, such as increased atmospheric CO₂ concentrations or geography, is not fully understood. Past intervals of geological time offer valuable insights to understand their responses to different forcing. Here, we investigate PDO and ENSO behaviour and their relationship in the mid-Pliocene Warm Period (MP; ∼3 million years ago) using the Pliocene Model Intercomparison Project version 2 (PlioMIP2) climate model ensemble. Results show that in the MP, although ENSO variability is robustly suppressed, PDO variability remains similar to the pre-industrial (PI) in terms of spatial pattern and multi model mean (MMM) amplitude, although individual models differ. The predominant frequencies of variability in the Pacific basin shift from interannual (3–4 years) in the PI to decadal (15–35 years) in the MP. Relative to a weakened ENSO, PDO is a more important mode of Pacific variability in the MP. The linear relationship between PDO and ENSO decreases by only 18 % in the MP even though ENSO variability decreases by ∼30 %, suggesting that the majority of PDO variability is not directly explained by changes in ENSO variability. We suggest that these results are driven by MP boundary conditions other than elevated CO₂ levels.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104932"},"PeriodicalIF":4.0,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144304953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aerosol composition and properties in Antarctica: Optical, microphysical, and radiative characteristics","authors":"Mikalai Filonchyk ,&nbsp;Michael P. Peterson ,&nbsp;Volha Hurynovich ,&nbsp;Lifeng Zhang ,&nbsp;Yi He","doi":"10.1016/j.gloplacha.2025.104935","DOIUrl":"10.1016/j.gloplacha.2025.104935","url":null,"abstract":"<div><div>Antarctica's unique climate and pristine environment make it a critical region for understanding the role of aerosols in global climate change. This study utilizes data from the AERONET (Aerosol Robotic Network) and MERRA-2 (Modern-Era Retrospective Analysis for Research and Applications) reanalysis system to investigate the optical, microphysical, and radiative properties of aerosols in the Antarctic atmosphere. Data from seven AERONET stations across Antarctica are analyzed to provide insights into aerosol optical depth (AOD), aerosol volume size distribution (VSD), and direct aerosol radiative forcing (DARF). The study's findings indicate that the primary sources of aerosols in Antarctica are natural, such as sea salt from ocean spray and sulfates from marine phytoplankton. The AOD values at a wavelength of 500 nm range from 0.027 ± 0.019 to 0.082 ± 0.042, have the lowest values at inland sites and the highest at coastal sites like Escudero_Station. Fine-mode aerosols dominate across most sites, with peaks in the volume size distribution between 0.09 and 0.76 μm, which is clearly associated with stable meteorological dynamics. The study also examines the radiative properties of aerosols, finding that DARF at the bottom of the atmosphere (BOA) indicates a cooling effect, with negative values ranging from −14.3 ± 4 to −3 ± 0.5 W/m². DARF at the top of the atmosphere (TOA) varies, with both positive and negative values, indicating the complex role of aerosols in the Antarctic climate. The atmospheric heating rate (HR), a measure of the impact of aerosols on temperature, showed variations across AERONET sites and seasons, with averages ranging from 0.03 ± 0.005 K day⁻¹ to 0.25 ± 0.03 K day⁻¹. These results highlight Antarctica's significance in studying the impact on aerosols on climate processes. Despite low aerosol concentrations compared to other world regions, Antarctica's unique environmental conditions provide valuable insights into climate change mechanisms. The study underscores the need for further research to understand aerosol properties, sources, and their broader impact on global climate.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104935"},"PeriodicalIF":4.0,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isotopic evidence from a Brazos River (Texas, USA) cretaceous/paleogene boundary section consistent with a pulse of greenhouse warming shortly after the Chicxulub impact","authors":"Kenneth G. MacLeod, Brian T. Huber, Clay Tabor, Siddhartha Mitra, Rachel Wheatley, Cheryl Harrison, Maya Tessler, Charles Bardeen, Nicole S. Lovenduski, Julio Sepúlveda, Joshua Coupe, Shixiong Hu","doi":"10.1016/j.gloplacha.2025.104924","DOIUrl":"https://doi.org/10.1016/j.gloplacha.2025.104924","url":null,"abstract":"Stable isotopic analyses of individual specimens of the benthic foraminifera <ce:italic>Lenticulina</ce:italic> show an ~1 ‰ decrease in d<ce:sup loc=\"post\">18</ce:sup>O values beginning 170 cm above the K/Pg boundary at the Brazos River ‘River Bank South’ Cretaceous/Paleogene (K/Pg) outcrop. This negative d<ce:sup loc=\"post\">18</ce:sup>O shift is most rigorously documented by analyses of visually screened fragments of gently crushed specimens. Scanning electron microscope images of broken specimens confirm that excellent test preservation is present throughout the section. Parallel d<ce:sup loc=\"post\">18</ce:sup>O analyses of other separates (specimens infilled with secondary carbonate, isolated secondary carbonate, and test fragments that failed visual screening) are offset by −1 ‰ to −3 ‰ from the clean fragments reinforcing arguments that clean foraminiferal fragments preserve depositional values.","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"35 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144304959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}