Variations of sulfur and carbon isotopes in seawater during the Doushantuo stage in late Neoproterozoic
文献类型：期刊论文
| 作者 | Zhang, TG; Chu, XL; Zhang, QR; Feng, LJ; Huo, WG |
| 刊名 | CHINESE SCIENCE BULLETIN
 |
| 出版日期 | 2003-07-01 |
| 卷号 | 48期号:13页码:1375-1380 |
| 关键词 | Doushantuo stage sulfur isotope carbon isotope snowball Earth bacterial sulfate reduction isotopic fractionation |
| ISSN号 | 1001-6538 |
| DOI | 10.1360/02wd0434 |
| 文献子类 | Article |
| 英文摘要 | Successive analyses of sulfur and carbon isotopic compositions of carbonates strata in the Doushantuo Formation in the Yangtze area were accomplished through a method of extracting trace sulfate from carbonates. Sulfur and carbon isotopic compositions of coeval seawater were estimated from the samples that show the least diagenetic alteration. A high-resolution age curve of sulfur isotopes in seawater sulfates was obtained in the Doushantuo stage, which reflects the trend of variation in seawater sulfur isotopes after the Neoproterozoic snowball Earth event. Similar characteristics of variation in carbon isotopes were observed in the coeval carbonates. A large positive delta(34)S excursion over +20parts per thousand occurs in ancient seawater sulfates in the early Doushantuo stage. Simultaneously, the delta(13)C values in ancient seawater carbonates exhibit a positive excursion up to 10parts per thousand. The maximum delta(34)S and delta(13)C values are +46.4% and +6.9parts per thousand, respectively. In the middle Doushantuo stage, the range of variation in delta(34)S values of seawater is relatively narrow, but delta(13)C values are quite high. Then, delta(34)S values of seawater become oscillating, and the same occurs in delta(13)C values. Negative excursions in delta(34)S and delta(13)C values occur simultaneously at the end of the Doushantuo stage, and the minimum delta(34)S and delta(13)C values dropped down to -10.1parts per thousand and -5.7parts per thousand, respectively. The characteristics of variations in the sulfur and carbon isotopes of ancient seawater imply strong changes in oceanic environment that became beneficial to inhabitation and propagation of organism. The organic productivity and burial rate of organic carbon once reached a quite high level during the Doushantuo stage. However, the state of environment became unstable after the global glaciation. The global climate and environment possibly were fluctuating and reiterating. The negative excursions in delta(34)S and delta(13)C values occurring at the end of the Doushantuo stage may represent a global event, which might be related to oxidation of deep seawater. |
| WOS关键词 | SNOWBALL EARTH ; YANGTZE PLATFORM ; CHINA ; SULFATE ; MODELS |
| WOS研究方向 | Science & Technology - Other Topics |
| 语种 | 英语 |
| WOS记录号 | WOS:000184463200020 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/78683]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zhang, TG |
| 作者单位 | Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources Explorat & Res, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, TG,Chu, XL,Zhang, QR,et al. Variations of sulfur and carbon isotopes in seawater during the Doushantuo stage in late Neoproterozoic[J]. CHINESE SCIENCE BULLETIN,2003,48(13):1375-1380. |
| APA | Zhang, TG,Chu, XL,Zhang, QR,Feng, LJ,&Huo, WG.(2003).Variations of sulfur and carbon isotopes in seawater during the Doushantuo stage in late Neoproterozoic.CHINESE SCIENCE BULLETIN,48(13),1375-1380. |
| MLA | Zhang, TG,et al."Variations of sulfur and carbon isotopes in seawater during the Doushantuo stage in late Neoproterozoic".CHINESE SCIENCE BULLETIN 48.13(2003):1375-1380. |
入库方式： OAI收割
来源：地质与地球物理研究所
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