Early cambrian oceanic anoxic event in northern guizhou: biomarkers and organic carbon isotope
文献类型：期刊论文
| 作者 | Chen Lan; Zhong Hong; Hu RuiZhong; Xiao JiaFei; Zou YanRong |
| 刊名 | Acta petrologica sinica
 |
| 出版日期 | 2006-09-01 |
| 卷号 | 22期号:9页码:2413-2423 |
| 关键词 | Early cambrian Black rock series Biomarkers Organic carbon isotope Oae Northern guizhou |
| ISSN号 | 1000-0569 |
| 通讯作者 | Chen lan(cllc_10@163.con) |
| 英文摘要 | This paper first provides biomarkers of early cambrian black rock series in the zunyi area, northern guizhou. integrated with organic carbon isotope compositions, the significant geological events are discussed in detail. abundant biomarkers, including n-alkanes, isoprenoid, steranes and terpanes from the late sinian-early cambrian black rock series, have been detected by gc and gc-ms. the n-alkanes are composed of nc(14)-nc(31) with nc(18) , nc(19) and/or nc(20) as the main peaks, and-characteristic of single peak distribution. the nc(17)/nc(31) ratios of 1.15 to 50.17 show the predominance of light hydrocarbons in the n-alkanes. oep values vary from 0.94 to 1.11, and cpi from 0.93 to 1.13, close to equilibrium value of 1.0, indicating no obvious odd-even carbon number predominance. pr/ph values range between 0.24 and 0.47, and they fluctuate in the vertical section. in the m/z191 gc-ms, c(30) hopane is the most abundant in the terpanes. according to the relative abundance, tricyclic terpanes are characterized by highest abundances, pentacyclotriterpanes by the second, and then tetracyclic terpanes. minor gammacerane is presented. in the m/z217 gc-ms, the regular steranes c(27)-c(28)-c(29) distributed with "v" shape, and sigma (c(27) + c(28)) > sigma c(29) with varying ratios between 1.25 and 1.99, whereas steranes sigma c(27)/sigma c(29) from 0.78 to 1.22 and rearranged steranes c(27)/regular steranesc(27) from 0.21 to 0.47. 4-methyl steranes have been detected, but their abundance are relatively lower. the sedimentary organic matter of anomalously organic-carbon-rich laminated shales across the zunyi area is characterized by high organic-carbon contents, ranging between 0.05 and 7. 91%. the carbon isotope curve displays delta(13)c values of the kerogen(delta(13)c(org)) fluctuating from -29.49 to -34.41 parts per thousand pdb with a negative excursion close to 4.3 parts per thousand, which may have been associated with seal level rise, anoxic water in the bottom and scarcity of benthic fauna. on the basis of geochemical parameters of biomarkers and organic carbon isotope compositions of the black rock series in the zunyi area, this paper discussed the maturity of rocks, quality and origin of organic matter, depositional environments and palaeoceanography. this study will provide reliable evidence for the paleogeographic reconstruction and geological events record in early cambrican of southern china. |
| WOS关键词 | YANGTZE PLATFORM ; BLACK SHALES ; CHINA ; SEDIMENTS ; BOUNDARY ; MINERALIZATION ; CONSTRAINTS ; RECORD ; OIL |
| WOS研究方向 | Geology |
| WOS类目 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000242107400018 |
| 出版者 | SCIENCE PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2379985 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Chen Lan |
| 作者单位 | 1.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China 2.Chongqing Univ, Inst Petr Engn, Chongqing 400042, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 4.Chinese Acad Sci, Guangzhou Inst Geochem, Styate Key Lab Organ Geochem, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen Lan,Zhong Hong,Hu RuiZhong,et al. Early cambrian oceanic anoxic event in northern guizhou: biomarkers and organic carbon isotope[J]. Acta petrologica sinica,2006,22(9):2413-2423. |
| APA | Chen Lan,Zhong Hong,Hu RuiZhong,Xiao JiaFei,&Zou YanRong.(2006).Early cambrian oceanic anoxic event in northern guizhou: biomarkers and organic carbon isotope.Acta petrologica sinica,22(9),2413-2423. |
| MLA | Chen Lan,et al."Early cambrian oceanic anoxic event in northern guizhou: biomarkers and organic carbon isotope".Acta petrologica sinica 22.9(2006):2413-2423. |
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来源：中国科学院大学
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