Organic Geochemistry最新文献

{"title":"Abundance of phytanyl and n-alkyl toluenes in petroleum from the Lower Saxony Basin (Germany) provides information on maturity, palaeosettings and sources","authors":"Georg Scheeder,&nbsp;Christian Ostertag-Henning,&nbsp;Martin Blumenberg","doi":"10.1016/j.orggeochem.2025.105025","DOIUrl":"10.1016/j.orggeochem.2025.105025","url":null,"abstract":"<div><div>Alkyl benzenes and toluenes are common in petroleum and shales. In addition to the series of <em>n</em>-alkylated benzenes and toluenes, the phytanyl toluene (and −benzene) is often abundant. In the present study, <em>n</em>-alkyl toluenes and phytanyl toluene were detected in more than 180 petroleum oils with different maturation histories and from two different source rocks, the Jurassic Posidonia Shale and the Cretaceous Wealden Shale (from the Lower Saxony Basin; Germany). A novel ratio of C₂₂-C₂₄ <em>meta</em>-substituted <em>n</em>-alkyl (combined in the ratio as “<em>n</em>”) to phytanyl (“<em>iso</em>”) toluenes is proposed as a thermal maturity indicator. Our data show that the relative proportion of phytanyl toluene to <em>n</em>-alkyl toluenes systematically decreases with maturity and therefore the “<em>n</em>/(<em>n</em> + <em>iso</em>)” toluene index increases. The relative change is due to both the processes of catalytic formation of <em>n</em>-alkyl toluenes and destruction of phytanyl toluene. The applicability of this ratio was confirmed using closed gold capsule pyrolysis maturation experiments with Posidonia Shale (for a maturation range from EASY%Ro of 0.78 to 1.4 %). The correlation is most pronounced in petroleum produced from the Posidonia Shale. For oils from the Wealden shales, the correlation is less clear due to the generally low phytanyl toluene contents. Comparisons of the “<em>n</em>/(<em>n</em> + <em>iso</em>)” toluene index with maturity-dependent biomarker ratios indicated its potential to record thermal maturity over a wide range. The occurrence of phytanyl toluene also appears to record a poorly understood (microbial) source, which was more abundant in the marine-euxinic depositional system of the Posidonia Shale than that of the brackish-marine Wealden shales.</div></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"207 ","pages":"Article 105025"},"PeriodicalIF":2.6,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aryl isoprenoids in severe biodegradation oils from the Miaoxi Depression, Bohai Bay Basin","authors":"Xiaoyong Yang ,&nbsp;Youjun Tang ,&nbsp;Peng Sun ,&nbsp;Yiming Hu ,&nbsp;Haifeng Yang ,&nbsp;Feilong Wang","doi":"10.1016/j.orggeochem.2025.105014","DOIUrl":"10.1016/j.orggeochem.2025.105014","url":null,"abstract":"<div><div>Aryl isoprenoids (AIs), a series of aromatic carotenoid derivatives, have served as significant biomarkers for paleoecology reconstructions. However, the effect of biodegradation on AIs remains unclear to date. Here, a confirmed family of progressively biodegraded oils from the Miaoxi Depression, Bohai Bay Basin was analyzed to investigate the fate of these compounds during severe biodegradation under natural conditions. Two pseudohomologous series with carbon numbers ranging from 13 to 31 and 40 were identified as 2,3,6- and 2,3,4-AIs in the reference oil. The concentrations of total AIs showed a gradual decline with increasing biodegradation but AIs survive in the most severely biodegraded oil (with a PM rank of 8 and an M-MN2 of 983) in this study. The differential proximity of adjacent methyl groups on the benzene ring may result in 2,3,4-AIs being more resistant to biodegradation compared to 2,3,6-AIs. No preferential biodegradation of individual AIs is proceeded systematically by carbon number, which may result from competition of two biodegradation pathways and favor of specific microbial communities. Moreover, the AIs-bearing proxies, including aryl isoprenoid ratio (AIR) and concentrations of total AIs, 2,3,6-AIs and 2,3,4-AIs, exhibit a significant decrease with increasing microbial alteration. Therefore, these proxies must be employed with caution to reconstruct photic-zone euxinia (PZE) for crude oils with potential microbial degradation.</div></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"207 ","pages":"Article 105014"},"PeriodicalIF":2.6,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144105273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geochemistry Articles – April 2025","authors":"","doi":"10.1016/j.orggeochem.2025.105015","DOIUrl":"10.1016/j.orggeochem.2025.105015","url":null,"abstract":"","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"207 ","pages":"Article 105015"},"PeriodicalIF":2.6,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144211861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Occurrence of tetraester and mixed ether/ester-bound iso-diabolic acid membrane-spanning lipids in acidic, high-elevation mineral soils","authors":"Francien Peterse ,&nbsp;Klaas G.J. Nierop ,&nbsp;Nicole J. Bale ,&nbsp;Sarah J. Feakins ,&nbsp;Chan-Mao Chen","doi":"10.1016/j.orggeochem.2025.105013","DOIUrl":"10.1016/j.orggeochem.2025.105013","url":null,"abstract":"<div><div>Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are a suite of membrane lipids that are widely used as empirical proxies for past temperature and pH. Although the stereochemistry of their glycerol moiety suggests that they are produced by bacteria, the exact producers and the biosynthetic pathway of brGDGTs remain unclear. Here we report the occurrence of tetraester and mixed ester/ether membrane-spanning lipids with a backbone consisting of <em>iso</em>-diabolic acid (<em>iso</em>-DA) containing up to two additional methyl groups in high-elevation (&gt;1900 masl), acidic (pH &lt; 4.5) mineral soils from Nepal and Rwanda. These compounds are presumed intermediate products during brGDGT synthesis but had not been detected in cultures or the environment before. Interestingly, while acid hydrolysis of the GDGT fraction releases <em>iso</em>-DA in the soil from Nepal, monoalkyl glycerol ethers with <em>iso</em>-C₁₅ and <em>iso</em>-C₁₇ chains are released in the soil from Rwanda. Although speculative, these results could support both current hypotheses that brGDGT synthesis can occur via tail-to-tail condensation of two <em>iso</em>-C₁₅ fatty acids to form <em>iso</em>-DA, as well as through the reduction of diesters to diethers and subsequent carbon–carbon linking as shown to occur during the synthesis of archaeal GDGTs.</div></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"207 ","pages":"Article 105013"},"PeriodicalIF":2.6,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144071340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unravelling the origin of gas in tight sandstones of the Hangjinqi gas field, Ordos Basin, China: New insights from natural gas geochemistry data","authors":"Yang Qin ,&nbsp;Chiyang Liu ,&nbsp;Junfeng Zhao ,&nbsp;Faqi He ,&nbsp;Wei Zhang ,&nbsp;Lihua Yang ,&nbsp;Nan Du ,&nbsp;Deyong Shao","doi":"10.1016/j.orggeochem.2025.105012","DOIUrl":"10.1016/j.orggeochem.2025.105012","url":null,"abstract":"<div><div>The Hangjinqi gas field, a vital tight sandstone gas field on the northern Ordos Basin margin, exhibits a debatable gas origin and accumulation mechanism. Integrating geochemical analyses with gas field data for basin-wide comparisons allows us to resolve the origin of the reservoired gas. Results reveal that the Upper Paleozoic coal-measure source rocks in the Hangjinqi area share similar characteristics with those in other Upper Paleozoic gas fields, where coal seams constitute the primary effective source rocks. However, they exhibit limited hydrocarbon-generating potential coupled with low thermal maturity. Natural gas has a broad range of dryness coefficient values. The carbon-hydrogen isotopes mostly exhibit a positive carbon-hydrogen isotope series, yet 40% of the samples display ethane and propane carbon-hydrogen isotope reversals. The C_5-7 and C₇ light hydrocarbons are dominated by isoalkanes and methylcyclohexane, respectively. The natural gas data follow the aromatic curve in the cross-plot of the heptane and isoheptane values. The natural gas in the Hangjinqi field is typical coal-derived gas, which is derived primarily from the Carboniferous-Permian transitional facies of humic organic matter, similar to Daniudi and other gas fields. Notably, the natural gas in the Hangjinqi gas field has undergone migration and dissipation (mainly including escape and loss). The Hangjinqi gas field presents an apparent contradiction between low maturity source rocks and high maturity natural gas. Its methane carbon isotope values significantly exceed those of the Daniudi gas field but align closely with those of the Sulige and Wushenqi gas fields, which are mature-type gas fields. Natural gas migration-dissipation is not the controlling factor in regional isotopic signatures. Therefore, approximately 40–76 % of the natural gas in the Hangjinqi gas field is exogenous gas. Moreover, these exogenous gases are derived primarily from the Sulige-Wushenqi gas field to its south, indicating strong genetic affinity. Overall, most Upper Paleozoic gas fields in the Ordos Basin have short migration distances, whereas the Hangjinqi gas field represents mixtures of locally generated hydrocarbons with gases migrating longer distances.</div></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"206 ","pages":"Article 105012"},"PeriodicalIF":2.6,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A saline lacustrine depositional environment enhances organic matter enrichment in the Permian Lucaogou shales","authors":"Yin Fu ,&nbsp;Zuodong Wang ,&nbsp;Ting Zhang ,&nbsp;Wenjun Wang ,&nbsp;Yongli Wang ,&nbsp;Wang Zhang ,&nbsp;Xiaobin Li ,&nbsp;Zhiyong Wang","doi":"10.1016/j.orggeochem.2025.105009","DOIUrl":"10.1016/j.orggeochem.2025.105009","url":null,"abstract":"<div><div>The Permian Lucaogou Formation shales are world-class source rocks with diverse biological, environmental, and economic properties. Considerable attention has been given to depositional environmental controls on organic matter enrichment. Here, we present a systematic organic and inorganic geochemical analysis of fresh core samples taken from the Lucaogou Formation in the Malu 1 well, located in the Santanghu Basin. The organic matter source of Lucaogou shale is dominated by prokaryotic organisms. γ- and β-carotanes are present in high abundance; lower carbon number carotenoids are also detected. Based on the distribution of <em>n</em>-alkanes, terpanes, and steranes, it is believed that γ-carotane and β-carotane mainly originate from bacteria. Low-carbon carotenoid-derived alkanes could result from the thermal decomposition products of γ-carotane and β-carotane. The minor input of terrigenous clastic material brought elemental nutrients that likely enhanced biotic productivity. Based on organic and inorganic data, the depositional environment can be defined by two stages (I and II). The contribution of green algae increases from Stage I to Stage II. The Stage I organic matter enrichment is controlled by the state of preservation, and the Stage II organic matter is interpreted to be controlled by biotic productivity. The depositional environment and the productivity of the lake have changed synergistically, together controlling the enrichment of organic matter in the Lucaogou shales.</div></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"206 ","pages":"Article 105009"},"PeriodicalIF":2.6,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143890857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microbial communities constrain the organic δ13C variations in the Lower Cambrian mudstones","authors":"Biqing Zhu ,&nbsp;Quanyou Liu ,&nbsp;Huiyuan Xu ,&nbsp;Dongya Zhu ,&nbsp;Jingbin Wang ,&nbsp;Xiaoqi Wu ,&nbsp;Pengpeng Li ,&nbsp;Yongqi Ruan","doi":"10.1016/j.orggeochem.2025.104991","DOIUrl":"10.1016/j.orggeochem.2025.104991","url":null,"abstract":"<div><div>The Lower Cambrian organic-rich mudstones preserve extensive records of microbial life, potentially contributing to the ‘Cambrian explosion’ (∼540 to 520 Ma) and the formation of ancient petroleum resources. However, the link of organic δ¹³C variations to microbial communities in the Lower Cambrian Formation within the Tarim Craton, part of the Central Asian Orogenic Belt, remains incompletely understood. Here, we conducted a comprehensive biomarker and δ¹³C analysis of mudstone extracts. The prevalence of eukaryotic organisms relative to prokaryotes, together with increased primary productivity, results in substantial ¹²C enrichment in organic matter, with the converse relationship being equally valid. The Lower Cambrian mudstones formed in more reducing yet confined stratified environments. The presence of cholestane, ergostane, stigmasterane, and 4-methylsterane (e.g., dinosterane) indicates the occurrence of red algae, prasinophytes, green algae, and dinoflagellates, respectively. Notably, the predominance of ergosterane and stigmasterane over cholestane suggests a greater contribution from green algae over red algae. The even-carbon preference across the C₁₄-C₂₀ range is indicative of limited contributions from <em>Gloeocapsomorpha prisca</em>. The presence of 3β-methylhopane, 7-+8-monomethylheptadecane and 2α-methylhopane points to contributions from methanotrophs and cyanobacteria. Since methanotrophs are active in an oxygen- and sulfate-depleted environment, we speculate that ¹³C-rich organic matter with a high value of 3-methylhopane index (3-MHI) may be deposited in waters with expanded anoxic zones and a scarcity of photoautotrophic sulfur bacteria (e.g., <em>Chlorobiaceae</em> and <em>Chromatiaceae</em>). This study highlights the constraints of microbial communities on organic δ¹³C variations and enhances our understanding of the evolution of ecology and primary productivity during the Precambrian-Cambrian transition.</div></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"205 ","pages":"Article 104991"},"PeriodicalIF":2.6,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143882916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Introduction to Xplorer, Hybrid and Early-Career Virtual Special Issue","authors":"Huiyuan Xu ,&nbsp;Jian Ma ,&nbsp;Kai Mangelsdorf","doi":"10.1016/j.orggeochem.2025.105007","DOIUrl":"10.1016/j.orggeochem.2025.105007","url":null,"abstract":"<div><div>The aim of this special issue is to highlight the contributions of early-career scientists in the field of organic geochemistry, showcasing their innovative ideas, state-of-the-art research methods, and novel findings. By covering a wide range of topics, from petroleum geochemistry to palaeoenvironmental reconstruction, this issue seeks to advance our understanding of the Earth system through molecular fingerprint and isotopic geochemistry. Interdisciplinary studies that bridge geological, ecological, and environmental processes are particularly encouraged, reinforcing the role of organic geochemistry as a critical tool in modern Earth sciences.</div></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"205 ","pages":"Article 105007"},"PeriodicalIF":2.6,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143882863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biodegradation sequence of coal organic matter and mechanism of biomethane formation in secondary biogenic gas accumulation areas","authors":"Yiliang Hu ,&nbsp;Yuan Bao ,&nbsp;Jiahao Meng ,&nbsp;Dan Li ,&nbsp;Ruihui Zheng","doi":"10.1016/j.orggeochem.2025.104996","DOIUrl":"10.1016/j.orggeochem.2025.104996","url":null,"abstract":"<div><div>Laboratory biodegradation experiments of organic matter (OM) in coal provide a theoretical foundation for comprehending the formation of secondary biogenic gas (SBG). However, limited research has been conducted on the microbial degradation extent and sequence of OM degradation experienced by underground coal seams throughout geological history. This study analyzes underground coal samples from the typical SBG accumulation areas in the Ordos Basin to investigate the origin and composition of OM in coal as well as their contributions to SBG formation. The findings indicate that terrigenous input is the primary source of OM in coal in these regions, which has undergone varying degrees of biodegradation. Notably, there are significant differences in the degree of biodegradation between saturated and aromatic hydrocarbons. Saturated hydrocarbons show PM grade 4–5 degradation while aromatics demonstrate PM grade 5–7 degradation. Aromatics display a higher susceptibility to biodegradation compared to saturated hydrocarbons, which differs significantly from crude oil. The degradation susceptibility sequence for saturated hydrocarbons is as follows: <em>n</em>-alkane &gt; sterane &gt; hopane. The biodegradation susceptibility of aromatic hydrocarbons depends on both the number of aromatic rings and alkyl-substituents; those with fewer rings and alkyl-substituents degrade more rapidly. Biodegradation of OM in coal plays a crucial role in SBG generation; however, a high degree of OM biodegradation does not necessarily correlate with greater accumulation of SBG due to other factors such as tectonic fractures and hydrogeological conditions that affect its preservation.</div></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"205 ","pages":"Article 104996"},"PeriodicalIF":2.6,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bacteriohopanepolyols and glycerol dialkyl glycerol tetraethers record Holocene redox regime shifts in a marine inlet in eastern Prydz Bay, Antarctica","authors":"Z.R. van Kemenade ,&nbsp;S. Kusch ,&nbsp;S. Berg ,&nbsp;E.C. Hopmans ,&nbsp;M.T.J. van der Meer ,&nbsp;D. Rush","doi":"10.1016/j.orggeochem.2025.105011","DOIUrl":"10.1016/j.orggeochem.2025.105011","url":null,"abstract":"<div><div>Prydz Bay is located at the terminus of one of the largest marine-terminating glacial systems of East Antarctica. Consequently, its sedimentary record may hold information on the response of marine biogeochemical cycling to changes in Antarctic palaeoceanography and palaeoclimate. Bacteriohopanepolyols (BHPs) and glycerol dialkyl glycerol tetraethers (GDGTs) offer great potential for tracing such changes, as these membrane lipids have been linked to distinct biogeochemical processes and environmental niches. Here, we present the BHP and GDGT inventory of a Holocene sediment record, recovered from a marine basin in eastern Prydz Bay. BHP and GDGT lipidomics were complemented with (organic) geochemical tools to reconstruct palaeoenvironmental conditions. GDGT-based indices suggest terrestrial organic matter influx was insignificant. Our results show elevated nucleoside-BHPs in early Holocene sediments from ∼9.1 to 10.7 cal ka BP. Their presence is interpreted to reflect autochthonous production under hypoxic-anoxic water column conditions, as inferred from BHT-<em>x</em> ratios of ≥0.2. The record is characterized by a large diversity of rare and novel unsaturated BHPs and BHP isomers. Their occurrence is potentially related to homeoviscous adaptations of the membranes of predominantly aerobic bacteria to cold conditions (i.e., reconstructed sea surface temperatures are −2.4 to −0.8 °C based on <span><math><msubsup><mrow><mi>T</mi><mi>E</mi><mi>X</mi></mrow><mrow><mn>86</mn></mrow><mrow><mi>O</mi><mi>H</mi></mrow></msubsup></math></span>). Increased abundance and diversity of these BHPs between ∼5.5–7.5 and ∼8.9–9.8 cal ka BP is likely associated with an oxygenation of the basin at this time. During the late Holocene (&lt;3.0 cal ka BP), the water column experienced photic zone euxinia, high rates of nitrogen loss and methanogenesis, as indicated by the presence of isorenieratene, enriched δ¹⁵N values and high GDGT-0/cren ratios, respectively. BHPs in these sediments likely derive from two different ecological niches: i) the uppermost oxygenated to suboxic waters where aerobic methane oxidation occurred and ii) the deeper sulfidic waters. More reducing conditions in the late Holocene coincide with increased brGDGT cyclization and methylation, and is proposed to indicate a shift in the source bacterial niche from sediments to the water column. This study shows that GDGT and BHP distributions can be linked to distinct redox regime shifts within the basin, which appear regulated by changes in sea level and sea ice in Prydz Bay. Our findings highlight the potential use of these lipids as tracers for biogeochemical cycling in marine polar regions.</div></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"206 ","pages":"Article 105011"},"PeriodicalIF":2.6,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}