Characteristics and origin of the Middle Proterozoic Dongshuichang chambersite deposit, Jixian, Tianjin, China
文献类型：期刊论文
| 作者 | Fan, DL; Yang, PJ; Wang, R |
| 刊名 | ORE GEOLOGY REVIEWS
 |
| 出版日期 | 1999-10-01 |
| 卷号 | 15期号:1-3页码:15-29 |
| 关键词 | B-Mn deposits chambersite rhodochrosite Middle Proterozoic Tianjin China |
| ISSN号 | 0169-1368 |
| 文献子类 | Review |
| 英文摘要 | The Jixian-type boron-manganese (B-Mn) deposits include both chambersite and rhodochrosite deposits, from which Dongshuichang is economically the best chambersite deposit. Although the ore bodies of the region are relatively small, they contain a rare B-Mn ore that is scientifically significant. Chambersite (Mn(3)B(7)O(13)Cl) is a rare mineral, discovered as a mineral in 1957 and as an ore in 1971 at the Dongshuichang deposit near Jixian, Tianjin City. The deposit forms a monocline with a southwest dip and covers an area of 2 km(2). In the mine area, the Gaoyuzhuang Formation, the upper member of the Middle Proterozoic Changcheng System, consists mainly of stromatolitic and muddy dolostone with B-Mn-bearing siliceous shale and dark-gray dolostone, Individual ore lenses range in length from 1 to 4 m with a mean thickness of 0.25 m. The ores can be divided into high-grade and low-grade, the former is composed of spindle and granular chambersite aggregates and the latter of spheroidal chambersite in dark-gray micritic dolostone. The center of spheroids is commonly composed of micritic and columnar chambersite, dolomite, clay minerals, and organic matter, around which columnar chambersite grew, forming a sunflower shape. The organic-carbon content in high-grade ores is 0.63%; in low-grade ores, 0.83%; and in overlying black siliceous shale, 3.75%. Total rare earth element (REE) contents of two chambersite ore samples are 29 and 35 ppm, whereas that of rhodochrosite ore is 22 ppm. The chondrite-normalized REE patterns of chambersite and rhodochrosite ores are similar, with small negative Ce and Eu anomalies and a small positive Gd anomaly. The delta(13)C(PDB) values of two rhodochrosite ore samples are -4.3 parts per thousand and -7.3 parts per thousand, indicating that the carbon source of Mn-carbonate minerals was mainly seawater bicarbonate with a small contribution from the degradation of organic carbon. The source of the Dongshuichang ore components was mainly submarine volcanic eruptions and a small amount from the weathering of pre-Proterozoic boron deposits. The chambersite precipitated under conditions of high salinity, high B, Mn, and Mg concentrations, and weak alkalinity. Low-oxygen conditions might be favorable for precipitation of chambersite. (C) 1999 Elsevier Science B.V. All rights reserved. |
| WOS关键词 | ELEMENTS |
| WOS研究方向 | Geology ; Mineralogy ; Mining & Mineral Processing |
| 语种 | 英语 |
| WOS记录号 | WOS:000083933600003 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/75302]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Fan, DL |
| 作者单位 | Chinese Acad Sci, Inst Geol, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Fan, DL,Yang, PJ,Wang, R. Characteristics and origin of the Middle Proterozoic Dongshuichang chambersite deposit, Jixian, Tianjin, China[J]. ORE GEOLOGY REVIEWS,1999,15(1-3):15-29. |
| APA | Fan, DL,Yang, PJ,&Wang, R.(1999).Characteristics and origin of the Middle Proterozoic Dongshuichang chambersite deposit, Jixian, Tianjin, China.ORE GEOLOGY REVIEWS,15(1-3),15-29. |
| MLA | Fan, DL,et al."Characteristics and origin of the Middle Proterozoic Dongshuichang chambersite deposit, Jixian, Tianjin, China".ORE GEOLOGY REVIEWS 15.1-3(1999):15-29. |
入库方式： OAI收割
来源：地质与地球物理研究所
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