Spatial and temporal variations in carbon and sulfur isotopic compositions of Sinian sedimentary rocks in the Yangtze platform, South China
文献类型：期刊论文
| 作者 | Li, R; Chen, J; Zhang, S; Lei, J; Shen, Y; Chen, X |
| 刊名 | PRECAMBRIAN RESEARCH
 |
| 出版日期 | 1999-08-01 |
| 卷号 | 97期号:1-2页码:59-75 |
| 关键词 | paleogeography Sinian stable carbon and sulfur isotopes Yangtze block |
| ISSN号 | 0301-9268 |
| 文献子类 | Article |
| 英文摘要 | Eight stratigraphic sections from the Yangtze Platform, South China were selected for a study of spatial and temporal variations in carbon and sulfur isotope compositions of Sinian sedimentary rocks. Carbon isotope compositions of carbonate from lower Sinian strata deposited between pulses of glacial diamictite range from -3.9 to -9.9 parts per thousand; the more negative values recorded from Mn carbonates suggest that, in part, the carbon was derived from the oxidation of organic matter during early diagenesis, In the upper Sinian strata delta(13)C varies with the facies, They are positive for the platform carbonates, whereas they are negative from about -3 to -12 parts per thousand for the carbonates formed in or near basin environments. It is evident that post-depositional alteration accounts for the strongly negative delta(13)C values. However, some information on primary isotopic compositions can be obtained by evaluating sample quality. The primary delta(13)C values of carbonates from the Doushantuo Formation are ca -3 to -4 parts per thousand, and from the Dengying Formation as low as -6 parts per thousand. delta(34)S values for pyrite from the lower Sinian rocks are highly positive, and range from values near the coeval seawater sulfate up to ca +60 parts per thousand. In contrast, delta(34)S values for pyrite from the upper Sinina rocks are negative down to -27 to -30 parts per thousand. The feature of sulfur isotopic composition for the lower Sinian rocks is consistent with the late Proterozoic sulfur isotopic record. It might be explained by the 'supercontinent model': many basins on the Yangtze block in a supercontinent tectonic background had limited or no access to the open ocean and the basin waters contained sulfate with considerably higher delta(34)S values than the coeval seawater for a geologically long period. An alternative explanation is based on the sulfate-minimum zone (SMZ) modal. Because of the slow sinking of organic matter bacterial sulfate reduction would be important in the lower Sinian shallow water environment. Particularly in the SMZ, the residual sulfate might have been significantly enriched in S-34, SO that pyrite produced in closed diagenetic system would yield very positive delta(34)S values. (C) 1999 Elsevier Science B.V. All rights reserved. |
| WOS关键词 | PRECAMBRIAN-CAMBRIAN BOUNDARY ; PROTEROZOIC STRATIGRAPHY ; ORGANIC-MATTER ; EARTH HISTORY ; EVOLUTION ; SEAWATER ; RECORD ; ORE ; GEOCHEMISTRY ; REDUCTION |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000082008800004 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/75506]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Li, R |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol, Beijing 100029, Peoples R China 2.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, R,Chen, J,Zhang, S,et al. Spatial and temporal variations in carbon and sulfur isotopic compositions of Sinian sedimentary rocks in the Yangtze platform, South China[J]. PRECAMBRIAN RESEARCH,1999,97(1-2):59-75. |
| APA | Li, R,Chen, J,Zhang, S,Lei, J,Shen, Y,&Chen, X.(1999).Spatial and temporal variations in carbon and sulfur isotopic compositions of Sinian sedimentary rocks in the Yangtze platform, South China.PRECAMBRIAN RESEARCH,97(1-2),59-75. |
| MLA | Li, R,et al."Spatial and temporal variations in carbon and sulfur isotopic compositions of Sinian sedimentary rocks in the Yangtze platform, South China".PRECAMBRIAN RESEARCH 97.1-2(1999):59-75. |
入库方式： OAI收割
来源：地质与地球物理研究所
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