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Molecular and Isotopic Characteristics of Mature Condensates from the East China Sea Shelf Basin Using GC×GC-TOFMS and GC-IRMS

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Journal of Earth Science 2019年第2期30卷 376-386页

作者： Chao Shan Jiaren Ye Alan Scarlett Kliti Grice Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of Geosciences WA Organic and isotope Geochemistry centre and John de Laeter Centrethe Institute for Geoscience ResearchDepartment of Applied ChemistryCurtin University of Technology

In this study, biomarkers, together with stable carbon(δ13 C) and hydrogen(δD) isotopic compositions of n-alkanes have been examined in a suite of condensates collected from the East China Sea Shelf Basin(ECSSB) in order to delineate their source organic matter input, depositional conditions and evaluate their thermal maturity. Previously, GC-MS analyses have shown that all the condensates are formed in oxidizing environment with terrestrial plants as their main source input. No significant differences were apparent for biomarker parameters, likely due to the low biomarker content and high maturity of these condensates. Conventional GC-MS analysis however, may provides limited information on the sources and thermal maturity of complex mixtures due to insufficient component resolution. In the current study, we used comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry(GC×GC-TOFMS) to increase the chromatographic resolution. Compounds such as alkyl cyclohexanes, alkyl cyclopentanes and diamondoids, which can be difficult to identify using conventional GC-MS analysis, were successfully identified using GC×GC-TOFMS. From our analyses we propose two possibly unreported indicators, including one maturity indicator(C5--cyclohexane/C5+-cyclohexane) and one oxidation-reduction environment indicator(alkyl-cyclohexane/alkyl-cyclopentane). Multiple petroleum charging events were proposed as an explanation for the maturity indicators indexes discrepancy between methyl-phenanthrene index(MPI) and methyl-adamantane index(MDI). In addition, the stable isotopic results show that condensates from the Paleogene have significantly higher positive δ13 C values of individual n-alkanes than the Neogene samples. Based on δD values, the samples can be divided into two groups, the differences between which are likely to be attributed to different biosynthetic precursors. Variation within each group can likely be attributed to vaporization.

关键词： condensate biomarker characteristic source information GC×GC-TOFMS GC-IRMS

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Cooling and exhumation of the mid-Jurassic porphyry copper systems in dexing City,SE China:insights from geo-and thermochronology

Cooling and exhumation of the mid-Jurassic porphyry copper s...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Xuan Liu Hong-rui Fan Noreen J.Evans Geoffrey E.Batt Brent I.A.McInnes Kui-feng Yang Ke-zhang Qin Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences john de laeter centre for isotope research Department of Applied GeologyCurtin University Center for Exploration Targeting School of Earth and Environment University of Western Australia

The dexing porphyry copper and Yinshan polymetallic deposits in dexing City,southeastern China arc both giant porphyry ore *** 15 km apart,they formed synchronously and share a similar magma source and mctallogenic evolution,but their metal endowment,dominant rock types,and alteration assemblages differ *** this contribution,we investigate the cause of these distinctions through new molybdenite Re-Os ages and zircon and apatite(U-Th)/Hc thermochronology *** has a molybdenite Re-Os age of-170.3 Ma,zircon(U-Th)/He(ZHe) ages of 110 to 120 Ma and apatite(U-Th)/He(AHe) ages of 7 to9 *** contrast,Yinshan has older ZHe ages of 128 to140 Ma and an AHe age of-30 *** in combination with previously published data,we conclude that the apparently slow cooling experienced by these bodies is primarily a reflection of their experiencing multiple episodes of thermal *** tentatively infer that both deposits were exposed in the Late Miocene or more recent time,with the dexing deposit more deeply exhumed than *** study has exploration implications for deeper porphyry-style ores at Yinshan and for porphyry deposits in non-arc(intraplate) settings in general.

关键词： dexing porphyry Cu deposit Yinshan poly metallic deposit (U-Th)/He Thermochronology Cooling Exhumation

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南天山中心世以来的幕式陆内造山作用:来自塔西南前陆盆地的磁性地层学与沉积学证据

南天山中心世以来的幕式陆内造山作用:来自塔西南前陆盆地的磁性...

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2014年中国地球科学联合学术年会——专题42：古地磁-构造研究新进展

作者：陈新伟陈汉林林秀斌 Karl-Heinz Wyrwoll Geoffrey E.Batt 沈忠悦程晓敢浙江大学地球科学系 School of Earth and environment University of Western Australia Stirling Highway Crawley Western Australia 6009Australia john de laeter centre of isotope research for the eartha and environment University of Western AustraliaCrawley Western Australia 6009 Australia

天山位于中亚造山带南部,在新生代开始发生再活化。对南天山新生代以来构造演化的研究有助于我们理解印度-亚洲碰撞对陆内造山带演化的影响。前人的研究主要集中于南天山中部和东部的新生代前陆盆地沉积,为了更好地揭示南天山新生代的...

天山位于中亚造山带南部,在新生代开始发生再活化。对南天山新生代以来构造演化的研究有助于我们理解印度-亚洲碰撞对陆内造山带演化的影响。前人的研究主要集中于南天山中部和东部的新生代前陆盆地沉积,为了更好地揭示南天山新生代的构造演化与沉积过程,作者选择了西南天山山前的铁热克萨孜剖面的新生代地层开展了磁性地层研究,确定不同沉积地层的时间,以揭示各地层时代并确定不同时期的沉积速率,限定西南天山在新生代构造过程。铁热克萨孜剖面位于乌恰县城以西约80km处,起点和终点GPS分别为N39.84°,E74.583°和N39.81°,E74.53°。该剖面位于向斜的北翼,新生界地层层序较为完整,出露古近系的阿尔塔什组

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