KMS Nanjing Institute of Geology and Palaeonotology,CAS
Microbial processes in the formation of the Sinian Gaoyan manganese carbonate ore, Sichuan Province, China | |
Fan, DL; Ye, J; Yin, LM (尹磊明); Zhang, RF | |
1999-10-01 | |
发表期刊 | ORE GEOLOGY REVIEWS |
ISSN | 0169-1368 |
卷号 | 15期号:1-3页码:79-93 |
摘要 | Based on a detailed study of ore fabrics, microbial remains, stable isotopes, and organic matter, the characteristics of the Late Sinian Gaoyan Mn-carbonate ores can be summarized as follows: (1) Ores have massive, laminated, spheroid-banded, and spheroidal structures. (2) Microbial remains, such as Sphareocongregus variabilis (Moorman, 1974) and Eoentophysalis sp. occur in the ores. (3) The ores contain abundant rhodochrosite, pyrite, and siliceous microframboids and possibly also multicellular magnetotactic aggregates. (4) Ca rhodochrosite in spheroidal ores always has a fibrous texture, similar to that of calcite reported to form as a product of bacterial fermentation. (5) The organic matter of ore samples records a relatively mild thermal history (up to catagenesis). Hopane and sterane indicate that bacteria and algae were the likely sources of the organic matter. (6) The mean value of delta(13)C(PDB) for micritic dolostone overlying the ore beds is -3.3 parts per thousand, and for Mn-carbonate ores, -4.9 parts per thousand. No positive correlation exists between the MnO content and delta(13)C(PDB) values, which is used as an indicator of enrichment of Mn in rhodochrosite formed during sulfate reduction, The above characteristics indicate that the Gaoyan Mn-carbonate ores were rich in organic matter and that sulfate reduction during early diagenesis was well developed. However, delta(13)C(PDB) values of Mn-carbonate ores are not consistent with formation solely in the zone of sulfate reduction. It is also difficult to explain the carbon source of the Gaoyan carbonate ores as being only from seawater bicarbonate and CO2 produced during sulfate reduction. We suggest that an integrated model for the origin of Gaoyan Mn-carbonate ores must include a combination of primary sedimentation, sulfate reduction, and fermentation processes, (C) 1999 Elsevier Science B.V. All rights reserved. |
关键词 | Mn Carbonate Microbial Processes Gaoyan Deposit Sinian Sichuan China |
语种 | 英语 |
关键词[WOS] | Isotopic Evidence ; Organic-matter ; Black Shales ; Oxidation ; Sediments ; Deposits ; Geochemistry ; Diagenesis ; Minerals ; Origin |
WOS研究方向 | Geology ; Mineralogy ; Mining & Mineral Processing |
WOS类目 | Geology ; Mineralogy ; Mining & Mineral Processing |
WOS记录号 | WOS:000083933600007 |
出版者 | ELSEVIER SCIENCE BV |
文献类型 | 期刊论文 |
条目标识符 | http://ir.nigpas.ac.cn/handle/332004/804 |
专题 | 中国科学院南京地质古生物研究所 |
通讯作者 | Fan, DL |
作者单位 | 1.Chinese Acad Sci, Inst Geol, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Nanjing Inst Geol & Paleontol, Nanjing 210008, Jiangsu Prov, Peoples R China |
推荐引用方式 GB/T 7714 | Fan, DL,Ye, J,Yin, LM ,et al. Microbial processes in the formation of the Sinian Gaoyan manganese carbonate ore, Sichuan Province, China[J]. ORE GEOLOGY REVIEWS,1999,15(1-3):79-93. |
APA | Fan, DL,Ye, J,Yin, LM ,&Zhang, RF.(1999).Microbial processes in the formation of the Sinian Gaoyan manganese carbonate ore, Sichuan Province, China.ORE GEOLOGY REVIEWS,15(1-3),79-93. |
MLA | Fan, DL,et al."Microbial processes in the formation of the Sinian Gaoyan manganese carbonate ore, Sichuan Province, China".ORE GEOLOGY REVIEWS 15.1-3(1999):79-93. |
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