Journal of China University of Geosciences最新文献

{"title":"Depositional and Ecological Features of Permian Oxygen Deficient Deposits at Shangsi Section, Northeast Sichuan, China","authors":"Mao Zhixin, Yang Jiaxin, Xie Xinong, Ruan Xiao-yan, Li Bo","doi":"10.1016/S1002-0705(08)60054-0","DOIUrl":"https://doi.org/10.1016/S1002-0705(08)60054-0","url":null,"abstract":"","PeriodicalId":100762,"journal":{"name":"Journal of China University of Geosciences","volume":"27 1","pages":"488-495"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74587702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Guadalupian (Middle Permian) Conodont Faunas at Shangsi Section, Northeast Sichuan Province","authors":"Yadong Sun, X. Lai, Hai-shui Jiang, Genming Luo, S. Si, Chunbo Yan, P. Wignall","doi":"10.1016/S1002-0705(08)60050-3","DOIUrl":"https://doi.org/10.1016/S1002-0705(08)60050-3","url":null,"abstract":"","PeriodicalId":100762,"journal":{"name":"Journal of China University of Geosciences","volume":"77 1","pages":"451-460"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79263762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Occurrence of Organic Matter in Calcimicrobialites across Permian–Triassic Boundary in Huayingshan Region, Sichuan, South China","authors":"Yang Hao, Wang Yongbiao, Chen Lin","doi":"10.1016/S1002-0705(08)60057-6","DOIUrl":"https://doi.org/10.1016/S1002-0705(08)60057-6","url":null,"abstract":"","PeriodicalId":100762,"journal":{"name":"Journal of China University of Geosciences","volume":"99 1","pages":"518-525"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83941077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbon Isotope Records Indicative of Paleoceanographical Events at the Latest Permian Dalong Formation at Shangsi, Northeast Sichuan, China","authors":"B. Xiao, Luo Genming, Wu Xia, Wang Youzhen, Hu Junhua, Wang Xinjun","doi":"10.1016/S1002-0705(08)60053-9","DOIUrl":"https://doi.org/10.1016/S1002-0705(08)60053-9","url":null,"abstract":"","PeriodicalId":100762,"journal":{"name":"Journal of China University of Geosciences","volume":"49 1","pages":"481-487"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89859509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microbial Mats in the Mesoproterozoic Carbonates of the North China Platform and Their Potential for Hydrocarbon Generation","authors":"Shi Xiaoying, Zhang Chuanheng, Jiang Ganqing, L. Juan, Wang Yi, Li Dianbo","doi":"10.1016/S1002-0705(08)60060-6","DOIUrl":"https://doi.org/10.1016/S1002-0705(08)60060-6","url":null,"abstract":"","PeriodicalId":100762,"journal":{"name":"Journal of China University of Geosciences","volume":"30 1","pages":"549-566"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83028346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular Evidence for Primary Producers and Paleo-environmental Conditions in Mesoproterozoic in the Xuanlong Depression in North China","authors":"Luo Genming, Xie Shu-cheng, W. Wenjun, S. Si, Hu Junhua, Shi Xiaoying","doi":"10.1016/S1002-0705(08)60061-8","DOIUrl":"https://doi.org/10.1016/S1002-0705(08)60061-8","url":null,"abstract":"","PeriodicalId":100762,"journal":{"name":"Journal of China University of Geosciences","volume":"26 1","pages":"567-576"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83365007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular Records of Primary Producers and Sedimentary Environmental Conditions of Late Permian Rocks in Northeast Sichuan, China","authors":"Xiaoyan Ruan, Genming Luo, Shouzhi Hu, C. Feng, S. Si, Wenjun Wu, Qiaozhen Guo, Guoquan Liu","doi":"10.1016/S1002-0705(08)60052-7","DOIUrl":"https://doi.org/10.1016/S1002-0705(08)60052-7","url":null,"abstract":"","PeriodicalId":100762,"journal":{"name":"Journal of China University of Geosciences","volume":"61 3 1","pages":"471-480"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87732307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Main Controlling Factors of Organic Matter Richness in a Permian Section of Guangyuan, Northeast Sichuan","authors":"Xie Xinong, Liu Hongjing, Xiong Xiang, Hu Junhua, Yang Jiaxin, Qin Jianzhong, Tenger, Li Wu","doi":"10.1016/S1002-0705(08)60056-4","DOIUrl":"https://doi.org/10.1016/S1002-0705(08)60056-4","url":null,"abstract":"","PeriodicalId":100762,"journal":{"name":"Journal of China University of Geosciences","volume":"14 1","pages":"507-517"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91108354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preliminary Estimation of Paleoproductivity via TOC and Habitat Types: Which Method Is More Reliable? —A Case Study on the Ordovician–Silurian Transitional Black Shales of the Upper Yangtze Platform, South China","authors":"Su Wenbo ,&nbsp;Wang Yongbiao ,&nbsp;Bradley D Cramer ,&nbsp;Axel Munnecke ,&nbsp;Li Zhiming ,&nbsp;Fu Lipu","doi":"10.1016/S1002-0705(08)60059-X","DOIUrl":"https://doi.org/10.1016/S1002-0705(08)60059-X","url":null,"abstract":"<div><p>New total organic carbon (TOC) data from the two Ordovician–Silurian transitional graptolite-bearing black shale intervals, the Wufeng Formation and the Longmaxi Formation in Central Guizhou and West Hubei, respectively, as well as previously reported TOC data from the same intervals in other places on the Yangtze platform of South China, have been used to produce an initial estimate of the primary paleoproductivity via a conventional inverse method (i.e., <em>R</em>_pp-inverse). The values of the <em>R</em>_pp-inverse are estimated to be 32 (43–21) gC/(m²·a) (Wufeng Formation) and 21 (27–16) gC/(m²·a) (Longmaxi Formation). Also, simultaneously, the habitat types (i.e., HT; cf., BA: benthic assemblage) and their temporal and spatial changes have been documented from the same succession, and an initial estimate of the primary paleoproductivity has been produced using a forward method (i.e., <em>R</em>_pp-forward). Being bounded mainly by the peritidal to inner-shelf environment shelly-facies or mixed-facies successions with BA1 to BA3 faunas both at the top and the base, which indicates the habitat types from HT II₁ to HT III₂, the biohabitat type of the two graptolite-bearing black shale intervals can be limited to HT III to HT IV, corresponding to the inner shelf to the outer shelf, with depths from roughly 60 m to 200—300 m. Based on the current data from the South China Sea and the southern part of the East China Sea, values of R_pp-forward should be about 100 to 400 gC/(m²·a). The difference in the results via the two methods suggests that paleoproductivity estimates from the geological strata need to be made cautiously, with particular attention paid to the paleogeographic setting, oxic-anoxic conditions, as also the preservation factor of organic carbon.</p></div>","PeriodicalId":100762,"journal":{"name":"Journal of China University of Geosciences","volume":"19 5","pages":"Pages 534-548"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1002-0705(08)60059-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72246123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of Montmorillonite and Calcite on Release and Adsorption of Cyanobacterial Fatty Acids at Ambient Temperature","authors":"Liu Deng ,&nbsp;Yang Xiaofen ,&nbsp;Wang Hongmei ,&nbsp;Li Jihong ,&nbsp;Su Nian","doi":"10.1016/S1002-0705(08)60058-8","DOIUrl":"https://doi.org/10.1016/S1002-0705(08)60058-8","url":null,"abstract":"<div><p>Minerals might act as important sorbents of sedimentary organic matter and reduce biodegradation, which favors the formation of hydrocarbon source rocks in the earth's history. Since most organic matter is degraded during the sinking process, at ambient temperature, it is important to investigate the adsorption capacity of different minerals during this process, to assess the organic loss from primary productivity to sedimentary organic matter. In this study, montmorillonite and calcite have been selected to study the impact of different minerals on the release, adsorption, and deposition of cyanobacterial (<em>Synechococcus elonpata</em>) fatty acids (FAs) at ambient temperature. Gas chromatography (GC), gas chromatography-mass spectrometry (GC-MS) have been utilized to detect the variation in fatty acids. Primary results suggest that minerals have a different impact on dissolved organic matter. Montmorillonite can specifically enhance the release of fatty acids from cyanobacterial cells by lowering the pH values of the solution. The adsorption of the dissolved organic matter by montmorillonite will also be enhanced under a lower pH value. Conjunction of fatty acids with montmorillonite to form a complex will favor the sinking and preservation of these organics. Selective adsorption is observed among fatty acids with different carbon numbers. In contrast, calcite does not show any impact on the release and adsorption of organic matter even though it is reportedly capable of acting as a catalyst during the transformation of organic matter at high temperature. The primary data bridge a link between primary productivity and sedimentary organic matter, suggesting the relative importance of claystones in the formation of hydrocarbon source rocks in the earth's history.</p></div>","PeriodicalId":100762,"journal":{"name":"Journal of China University of Geosciences","volume":"19 5","pages":"Pages 526-533"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1002-0705(08)60058-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72246129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}