Organic Geochemistry最新文献

{"title":"Carbon and hydrogen isotopic compositions of C7 hydrocarbons and their geochemical significance in light oils/condensates from the Kuqa Depression, Tarim Basin, NW China","authors":"Qinghua Wang ,&nbsp;Hanyu Deng ,&nbsp;Tao Mo ,&nbsp;Haizu Zhang ,&nbsp;Bin Cheng ,&nbsp;Yunpeng Wang ,&nbsp;Zewen Liao","doi":"10.1016/j.orggeochem.2024.104783","DOIUrl":"https://doi.org/10.1016/j.orggeochem.2024.104783","url":null,"abstract":"<div><p>In this study, the geochemical significance of the δ¹³C and δ²H values of selected C₇ light hydrocarbons (<em>n</em>C₇ = <em>n</em>-heptane; MCH = methylcyclohexane; Tol = toluene) is investigated in 58 light oil/condensate (LOC) samples from the Kuqa Depression of the Tarim Basin, NW China. For most of the LOCs in the western region, the <em>n</em>C₇, MCH, and Tol exhibit systematic differences where δ¹³C<em>_n</em>_C7 &lt; δ¹³C_MCH &lt; δ¹³C_Tol and δ²H_Tol &lt; δ²H<em>_n</em>_C7 &lt; δ²H_MCH. LOCs from the eastern area have higher δ¹³C_oil, δ¹³C_Tol, and δ¹³C_MCH values than those from the western area and their δ¹³C values for C₇ hydrocarbons are similar and δ²H<em>_n</em>_C7 &lt; δ²H_MCH &lt; δ²H_Tol. These organic geochemical differences indicate that the LOCs from the western and eastern areas of the Kuqa Depression were mainly derived from lacustrine and coaly parent materials, respectively. The LOC reservoirs generally received a late hydrocarbon charge of the high-maturity natural gas, and the LOCs from the western Kela–Keshen areas subsequently experienced gas leakage. Hierarchical cluster analysis indicates that the most important influencing factor on the LOCs of the Kuqa Depression is the sedimentary facies (coaly and lacustrine), followed by gas leakage and then parent organic type (lacustrine sapropel and humic organic matter). A cross-plot of the Δδ²H_Tol–MCH versus Tol/MCH can distinguish the origins of continental facies parent materials and gas leakage of the LOCs.</p></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"192 ","pages":"Article 104783"},"PeriodicalIF":3.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140632762","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":"Source rock and climate model for the Cretaceous Jiufotang Formation, Kazuo Basin, China: Geochemistry and petrography","authors":"Shangli Liu ,&nbsp;Haifeng Gai ,&nbsp;Peng Cheng ,&nbsp;Qin Zhou ,&nbsp;Tengfei Li ,&nbsp;Sui Ji ,&nbsp;Xing Wang ,&nbsp;Hui Tian","doi":"10.1016/j.orggeochem.2024.104781","DOIUrl":"https://doi.org/10.1016/j.orggeochem.2024.104781","url":null,"abstract":"<div><p>The Lower Cretaceous Jiufotang Formation, situated in western Liaoning Province, China, has attracted attention for abundant Jehol Biota fossils and the potential to improve understanding of the relationships among climate change, evolution of terrigenous organisms, and organic matter (OM) enrichment in lake systems during the Early Cretaceous. Based on organic petrology and biomarker analyses, this study investigated the depositional environment, OM sources, and enrichment mechanism of Jiufotang mudstone in the Kazuo Basin. Maceral composition shows that the OM source of Jiufotang mudstone shifted from mainly aquatic to terrigenous, and biomarkers such as abundant diterpenoids and retene indicate that terrigenous higher plants were mainly conifers during deposition of the Jiufotang Formation. Pr/Ph ratios (0.07–0.65) show that the studied section was deposited in anoxic bottom water that may be necessary for OM enrichment in lake systems. Gravity flows were accompanied by input of many clastic minerals and oxygenation of bottom waters, which is unfavorable for OM enrichment. Therefore, the best OM enrichment model for lake systems includes anoxic bottom water, stable water column stratification, low sedimentation rates, and high phytoplankton contributions. The climate changed from relatively dry to humid, which drove changes in the OM enrichment model in the lake. More importantly, the climate and terrigenous plant information obtained by biomarkers is useful to reconstruct the ecological environment of the Jehol Biota.</p></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"192 ","pages":"Article 104781"},"PeriodicalIF":3.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140632761","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 – January 2024","authors":"","doi":"10.1016/j.orggeochem.2024.104769","DOIUrl":"https://doi.org/10.1016/j.orggeochem.2024.104769","url":null,"abstract":"","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"191 ","pages":"Article 104769"},"PeriodicalIF":3.0,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140645074","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 – February 2024","authors":"","doi":"10.1016/j.orggeochem.2024.104768","DOIUrl":"https://doi.org/10.1016/j.orggeochem.2024.104768","url":null,"abstract":"","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"191 ","pages":"Article 104768"},"PeriodicalIF":3.0,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140645073","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":"Impact of water depth on the distributions and proxies of isoprenoidal hydroxylated GDGTs in the Mediterranean Sea and the Red Sea","authors":"Devika Varma ,&nbsp;Marcel T.J. van der Meer ,&nbsp;Gert-Jan Reichart ,&nbsp;Stefan Schouten","doi":"10.1016/j.orggeochem.2024.104780","DOIUrl":"10.1016/j.orggeochem.2024.104780","url":null,"abstract":"<div><p>Hydroxylated Isoprenoidal Glycerol Dialkyl Glycerol Tetraethers (OH-isoGDGTs) have recently been utilized as paleothermometers in the marine environment. However, their ability to reconstruct temperature in the Mediterranean and Red Sea has not been adequately investigated. Previous research has shown that archaeal communities inhabiting different water depths in these basins exert a substantial influence on the regular isoGDGT distributions and associated proxies such as the <span><math><msub><mrow><mi>T</mi><mi>E</mi><mi>X</mi></mrow><mn>86</mn></msub></math></span>. However, the impact of these archaea on OH-isoGDGTs and their corresponding proxies remains unclear. In this study, we examined the distribution of OH-isoGDGTs and their associated proxies (<span><math><mrow><mo>%</mo><mi>O</mi><mi>H</mi></mrow></math></span>, RI-OH, RI-OH′ and <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>) in surface sediments of the Mediterranean and the Red Sea. We observe strong correlations between the fractional abundances of OH-isoGDGTs, relative to all isoGDGTs and OH-isoGDGTs, and water depth which suggests that deep-water archaeal communities have a lower OH-isoGDGT abundance compared to the shallow communities. As a result, <span><math><mrow><mo>%</mo><mi>O</mi><mi>H</mi></mrow></math></span> and <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> are strongly correlated with water depth, particularly at depths &lt;500 m in the Mediterranean Sea. Interestingly, RI-OH and RI-OH′ show no correlation with water depth in the Mediterranean Sea. Instead, they correlate more strongly with satellite-derived sea surface temperature compared to other isoGDGT-based proxies, indicating their potential as paleothermometers. Finally, unlike <span><math><msub><mrow><mi>T</mi><mi>E</mi><mi>X</mi></mrow><mn>86</mn></msub></math></span> and <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>, the <span><math><mrow><mo>%</mo><mi>O</mi><mi>H</mi></mrow></math></span>, RI-OH and RI-OH′ do not exhibit distinct 'Red Sea cluster' and display comparable values to sediments from other tropical oceans. Further research on sedimentary OH-isoGDGT distributions with broader geographical coverage within these basins and enrichment cultures of deep-water archaea are needed to confirm these observations.</p></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"194 ","pages":"Article 104780"},"PeriodicalIF":2.6,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0146638024000457/pdfft?md5=ffd1797c16877ffb7287d55cfaa65295&pid=1-s2.0-S0146638024000457-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140787238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Molecular and carbon isotopic evidence for the possible origin of 13α(n-alkyl)-tricyclic terpanes in Mesoproterozoic bitumens from the Yanliao Rift, North China","authors":"Tao Zhang ,&nbsp;Ping'an Peng ,&nbsp;Yongfei Li ,&nbsp;Shouliang Sun ,&nbsp;Huijuan Guo ,&nbsp;Haiming Pang","doi":"10.1016/j.orggeochem.2024.104766","DOIUrl":"https://doi.org/10.1016/j.orggeochem.2024.104766","url":null,"abstract":"<div><p>The Mesoproterozoic Jixian System in the Yanliao Rift of the North China Craton contains organic-rich shales within the Hongshuizhuang, Tieling, and Xiamaling formations. The biomarker composition of these formations is characterized by the dominance of 13α(<em>n</em>-alkyl)-tricyclic terpanes. The distinctive structure and main occurrence of 13α(<em>n</em>-alkyl)-tricyclic terpanes in the Mesoproterozoic Jixian System in the Yanliao Rift have intrigued researchers, raising questions about their origin and formation mechanisms. This study found that δ¹³C values of 13α(<em>n</em>-alkyl)-tricyclic terpanes ranged from −32.7‰ to −26.2‰, similar to those of kerogen and <em>n</em>-alkanes, but significantly more depleted in ¹³C compared to 13β(H),14α(H)-tricyclic terpanes, which ranged from −28.5‰ to −25.7‰. The difference in δ¹³C values suggested that 13α(<em>n</em>-alkyl)-tricyclic terpanes were not formed by the same mechanism or precursors as 13β(H),14α(H)-tricyclic terpanes. No sterane biomarkers indicative of eukaryotic source input were detected. Instead, the comparable concentrations of 13α(<em>n</em>-alkyl)-tricyclic terpanes and <em>n</em>-alkanes in the samples implied a possible origin from primary organic matter producers, notably cyanobacteria. Moreover, the biomarkers obtained from distinct formations within the Mesoproterozoic Jixian System exhibited an impressive degree of simplicity, similarity and mutual correlation. These findings collectively suggest the prevalence of a cyanobacteria-dominated primitive ecosystem during the Mesoproterozoic Era within the confines of the Yanliao Rift.</p></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"190 ","pages":"Article 104766"},"PeriodicalIF":3.0,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140123237","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":"Taraxerol abundance as a proxy for in situ mangrove sediment","authors":"Juliet P. Sefton ,&nbsp;Andrew C. Kemp ,&nbsp;Christopher H. Vane ,&nbsp;Alexander W. Kim ,&nbsp;Christopher E. Bernhardt ,&nbsp;Jonathan Johnson ,&nbsp;Simon E. Engelhart","doi":"10.1016/j.orggeochem.2024.104767","DOIUrl":"10.1016/j.orggeochem.2024.104767","url":null,"abstract":"<div><p>Mangrove sediments are valuable archives of relative sea-level change if they can be distinguished in the stratigraphic record from other organic-rich depositional environments (e.g., freshwater swamps). Proxies for establishing environment of deposition can be poorly preserved (e.g., foraminifera) in mangrove sediment. Consequently, differentiating mangrove and freshwater sediment in the stratigraphic record is often subjective. We explore if biomarkers can objectively identify mangrove sediment with emphasis on their utility for reconstructing relative sea level. Our approach is specific to identifying in situ sediment, which has received less attention than identifying allochthonous mangrove organic matter. To characterize mangrove and non-mangrove (freshwater) environments, we measured <em>n</em>-alkane, sterol, and triterpenoid abundances in surface sediments at three sites in the Federated States of Micronesia. Elevated taraxerol abundance is diagnostic of sediment accumulating in mangroves and taraxerol is particularly abundant beneath monospecific stands of <em>Rhizophora</em> spp. Taraxerol was undetectable in freshwater sediment. Other triterpenoids are more abundant in mangrove sediment than in freshwater sediment. Using cores from Micronesian mangroves, we examine if biomarkers in sediments are indicative of in situ deposition in a mangrove, and have utility as a relative sea-level proxy. Taraxerol concentrations in cores are comparable to surface mangrove sediments, which indicates deposition in a mangrove. This interpretation is supported by pollen assemblages. Downcore taraxerol variability may reflect changing inputs from <em>Rhizophora</em> spp. rather than diagenesis. We propose that taraxerol is a proxy that differentiates between organic sediment that accumulated in mangrove vs. freshwater environments, lending it utility for reconstructing relative sea level.</p></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"191 ","pages":"Article 104767"},"PeriodicalIF":3.0,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0146638024000329/pdfft?md5=8ff1efc74a63132f3decd270b40bd980&pid=1-s2.0-S0146638024000329-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140105512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"The presence of free benzenepolycarboxylic acids (BPCAs) may result in the overestimation of dissolved black carbon in aqueous samples","authors":"Riley Barton,&nbsp;Isabella Winston,&nbsp;Sasha Wagner","doi":"10.1016/j.orggeochem.2024.104765","DOIUrl":"https://doi.org/10.1016/j.orggeochem.2024.104765","url":null,"abstract":"<div><p>Dissolved black carbon (DBC) is the condensed aromatic fraction of dissolved organic matter produced during the thermal alteration of organic material (e.g., fire). DBC concentrations are often determined using the benzenepolycarboxylic acid (BPCA) method where condensed aromatic structures are oxidized into BPCA molecular markers for quantification. However, BPCA molecules have been recently identified in fire-affected surface waters and leachates of heated soils and wildfire ash. If they survive the sample preparation and analytical procedures, the presence of these “free” BPCAs in water may result in an overestimation of DBC concentrations in aqueous samples. To assess the potential impact of free BPCAs on DBC quantification, we spiked ultrapure water, salt water, and organic matter solutions with BPCA standards and treated them as environmental samples being analyzed for DBC. Each BPCA standard was recovered in detectable amounts, with the most-substituted BPCAs having lower percent recoveries than less-substituted BPCAs. Spiked organic matter solutions had significantly higher calculated DBC concentrations than their unamended counterparts only when the conversion factor used included less substituted BPCAs. Overall, our results show that DBC quantification could be impacted by free BPCAs in aqueous samples, but the degree of impact is largely dependent upon the properties of the individual BPCA molecular marker.</p></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"190 ","pages":"Article 104765"},"PeriodicalIF":3.0,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140095644","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":"Root-derived carbon stocks in formerly deep-ploughed soils – A biomarker-based approach","authors":"D.J. Burger ,&nbsp;S.L. Bauke ,&nbsp;F. Schneider ,&nbsp;A. Kappenberg ,&nbsp;M.I. Gocke","doi":"10.1016/j.orggeochem.2024.104756","DOIUrl":"10.1016/j.orggeochem.2024.104756","url":null,"abstract":"<div><p>Roots can add significant amounts of carbon (C) to the subsoil, which improves soil physical properties and can mitigate climate change. About 5% of croplands in Germany have been deep-ploughed (30–120 cm) at least once. This can provide better root access to the subsoil and may increase yields, but little is known on the fate of root-derived C in the subsoil (at depth greater than 30 cm) after deep-ploughing. We hypothesized that five decades after deep-ploughing, root-derived C stocks were higher than conventionally ploughed treatments due to better root development. We analysed suberin and cutin monomers as tracers for root- and shoot-derived C at three former deep-ploughed sites in Northern Germany with different soil textures and deep-ploughing depths. Concentrations of suberin monomers in the soil positively correlated with root biomass; this was most pronounced at one sandy site, but had higher variability at the other two sites due to crops with different root systems in the crop rotation, lower root development, and more favourable conditions for C decomposition. Suberin contributed more to the bulk soil organic carbon (SOC) stocks than cutin throughout the soil profile at all sites. The contribution of suberin monomers to the bulk SOC stock at silty site Banteln and the sandy site Essemühle was 38% higher in the deep-ploughed plots than at the reference plot, respectively, these differences were most visible in the subsoil of Essemühle. We conclude that as C stocks and root development increase, suberin SOC stocks also increase, especially in sandy subsoils with low pH.</p></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"190 ","pages":"Article 104756"},"PeriodicalIF":3.0,"publicationDate":"2024-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0146638024000214/pdfft?md5=3f487fca19ce6ff7dd2aad6e5afe0575&pid=1-s2.0-S0146638024000214-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139987725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Geochemical evidence for biodegradation in high-rank coals from Qinshui Basin, North China","authors":"Biying Chen,&nbsp;Xinchu Wang,&nbsp;Lujia Fang,&nbsp;Rob M. Ellam,&nbsp;Sheng Xu","doi":"10.1016/j.orggeochem.2024.104755","DOIUrl":"https://doi.org/10.1016/j.orggeochem.2024.104755","url":null,"abstract":"<div><p>Understanding the generation of secondary microbial methane (SMM) is important for the evaluation of natural gas resources and instructive for the stimulation of methane production. Coal seams are popular targets for extracting in situ preserved methane and studying microbe-stimulated methane yield. However, few studies have been done on overmature coals. Here we collected gas samples from coals varying from bituminous to meta-anthracite in the Qinshui Basin, North China, and analysed the molecular and stable isotopic compositions to systematically evaluate the influence of biodegradation in high-rank coals in geological settings. The stable isotope signatures (δ¹³C and δD) of methane are dominated by the thermal decomposition of organic matter in deep coals but inconsistent with the maturity rank of shallow burial coals. The decoupling of coal maturity with C₁/C₂₊ ratios and δ¹³C-CH₄ values, and positive δ¹³C-CO₂ values (−9.2 to +24.4 ‰) suggest biodegradation of light wet gases (C₂₊ components) and CO₂ reduction. Negative trends between δ¹³C-CO₂ and CH₄/CO₂ in shallow burial coal seams reveal the mutual conversion of CH₄ and CO₂ and carbon isotope exchange, driven by microorganisms. The calculated isotopic temperatures (33–328 °C) based on the carbon isotope fractionation factors between CH₄ and CO₂ (1.024–1.069) demonstrate that carbon isotope exchange is prevalent in high-rank coals. It also reveals that the burial depth is an imperative factor in controlling microbial environments and thus the biodegradation process. This study implicates the potential of high-rank coals as the target for microbial-enhanced methane recovery and also implies that microorganisms are widely involved in reservoir carbon cycling.</p></div>","PeriodicalId":400,"journal":{"name":"Organic Geochemistry","volume":"190 ","pages":"Article 104755"},"PeriodicalIF":3.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139941791","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}