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Hydrocarbons in ferromanganese crusts from Pacific seamounts and their implications for the genesis
Zhang, M; Sun, XM; Ting, X; He, GW; Lu, HF; eessxm@mail.systu.edu.cn
2007
发表期刊ACTA PETROLOGICA SINICA
ISSN1000-0569
卷号23期号:11页码:3026-3036
摘要Trace hydrocarbons in the ferromanganese crusts collected from central and west Pacific seamounts were detected by GC and GC-MS, and abundance, biological source, sedimentary environment and maturity of the soluble hydrocarbons in the crusts were investigated preliminarily. The results indicate that the organic matters are mostly of mature hydrocarbons, excepting one. sample. "A"/C ratios reach as high as 9.81 to 21.15. The ratios of 22S/(22S +22R) to C-31-homohopane are 0.43 similar to 0.46, Tm/(Tm + Ts) are 0.40 similar to 0.59. The ratios of C-29 and C-30 hopanes alpha beta/ (alpha beta +beta alpha) are 0.81 similar to 0.85 and 0.85 similar to 0.89, respectively. Besides, the ratio of C(29)20S/(20S + 20R) rearranged-sterane and C-29 alpha beta beta/(alpha beta beta + alpha alpha alpha) sterane gave values of 0.45 similar to 0.60 and 0.35 similar to 0.42, respectively. Consequently, the calculated vitrinite reflectance, R-sc ( %), varies between 0.73 % to 0.81 %, occasionally 1.06%. Abundance sequence of the measured sterane is C-29-sterane > C-27-sterane > C-28-sterane, pregnane and 4-methy steranes are also identified. The organic matters in ferromanganese crusts are composed predominantly of Type II ones. The pristane/phytane ( Pr/Ph) ratios for the ferromanganese crusts are 0.35 similar to 0.82, indicating that the hydrocarbon were probably deposited in a strong reducing environment. Composition and distribution of n-alkanes, acyclic isopenoid, terpanes and steranes seem to show that the organic matters sourced from algae or microbes and terrestrial plants. Submarine hydrothermal activity might have supplied heat energy for thermal evolution of hydrocarbon in the crusts. It is proposed that the hydrocarbons were generated in a strong reducing submarine environment, transported to the seamounts and finally entered the crusts by pervasion or infiltration.
部门归属[Zhang Mei; Sun XiaoMing; Xue Ting; He GaoWen; Lu HongFeng] Sun Yat Sen Univ, Dept Earth Sci, Guangzhou 510275, Peoples R China; [Sun XiaoMing] Sun Yatsen Univ, Hidden Deposits Res Inst, Nanjing 210007, Peoples R China; [Sun XiaoMing] Eastern China Geol & Mining Org Non Ferrous Metal, Nanjing 210007, Peoples R China; [Sun XiaoMing] Chinese Acad Sci, Key Lab Marginal Sea Geol, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China; [Sun XiaoMing] Chinese Acad Sci, Key Lab Marginal Sea Geol, S China Sea Inst Oceanol, Guangzhou 510640, Peoples R China; [He GaoWen; Lu HongFeng] Minist Land & Resoures, Guangzhou Marine Geol Survey, Guangzhou 510760, Guangdong, Peoples R China
关键词Ferromanganese Crusts Hydrocarbons Biomarkers Carbon Isotopic Compositions Genesis
学科领域Geology
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000254139500032
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4448
专题中科院边缘海地质重点实验室
通讯作者eessxm@mail.systu.edu.cn
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GB/T 7714
Zhang, M,Sun, XM,Ting, X,et al. Hydrocarbons in ferromanganese crusts from Pacific seamounts and their implications for the genesis[J]. ACTA PETROLOGICA SINICA,2007,23(11):3026-3036.
APA Zhang, M,Sun, XM,Ting, X,He, GW,Lu, HF,&eessxm@mail.systu.edu.cn.(2007).Hydrocarbons in ferromanganese crusts from Pacific seamounts and their implications for the genesis.ACTA PETROLOGICA SINICA,23(11),3026-3036.
MLA Zhang, M,et al."Hydrocarbons in ferromanganese crusts from Pacific seamounts and their implications for the genesis".ACTA PETROLOGICA SINICA 23.11(2007):3026-3036.
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