| 西藏甲玛铜多金属矿富银矿体地质特征、银赋存状态及富集机理研究 |
| |
| 引用本文： | 胡正华,唐菊兴,丁枫,郑文宝,邓世林,杨毅,张志,王艺云,林彬,丁帅.西藏甲玛铜多金属矿富银矿体地质特征、银赋存状态及富集机理研究[J].地球学报,2011,32(6):668-680. |
| |
| 作者姓名： | 胡正华 唐菊兴 丁枫 郑文宝 邓世林 杨毅 张志 王艺云 林彬 丁帅 |
| |
| 作者单位： | 成都理工大学;成都理工大学；中国地质科学院矿产资源研究所;成都理工大学;成都理工大学;四川省地矿局物探队;成都理工大学;成都理工大学;成都理工大学;成都理工大学;成都理工大学 |
| |
| 基金项目： | 自然科学基金(编号: 41172077)；中央公益性行业专项(编号: 201011013-3)；国家973项目(编号: 2011CB403103) |
| |
| 摘 要： | 位于西藏墨竹工卡县的甲玛铜多金属矿床是冈底斯中东段近年来新发现的超大型矿床,已探明伴生银资源量大于6000t.根据产出特征可将甲玛矿区的银矿体分为矽卡型与大理岩型两种.通过矿相学、电子显微探针研究发现银均以不可见银和可见银两种形式存在.不可见银以晶格银的形式赋存于铜矿物中；其次以次显微包体银的形式赋存于方铅矿中.可见银...
|
| 关 键 词： | 甲玛 银矿体特征 赋存状态 富集机理 |
A Study of Features, Modes of Occurrence and Enrichment Mechanism of Silver-rich Ore Bodies in the Jiama Copper-Polymetallic Deposit of Tibet |
| |
| HU Zheng-hu,TANG Ju-xing,DING Feng,ZHENG Wen-bao,DENG Shi-lin,YANG Yi,ZHANG Zhi,WANG Yi-yun,LIN Bin and DING Shuai.A Study of Features, Modes of Occurrence and Enrichment Mechanism of Silver-rich Ore Bodies in the Jiama Copper-Polymetallic Deposit of Tibet[J].Acta Geoscientia Sinica,2011,32(6):668-680. |
| |
| Authors: | HU Zheng-hu TANG Ju-xing DING Feng ZHENG Wen-bao DENG Shi-lin YANG Yi ZHANG Zhi WANG Yi-yun LIN Bin and DING Shuai |
| |
| Institution: | Chengdu University of Technology;Chengdu University of Technology; Institute of Mineral Resources, Chinese Academy of Geological Science;Chengdu University of Technology;Chengdu University of Technology;Geophysical Prospecting Team of Sichuan Bureau of Geology and Mineral Resources;Chengdu University of Technology;Chengdu University of Technology;Chengdu University of Technology;Chengdu University of Technology;Chengdu University of Technology |
| |
| Abstract: | Located in Maizhokunggar County of Tibet, the Jiama copper-polymetallic ore deposit discovered in recent years has silver reserves of over 6000t, constituting a superlarge ore deposit in the eastern part of central Gangdise. According to modes of occurrence, the silver ore bodies in the Jiama copper-polymetallic ore deposit can be classified into skarn-type and marble-type. Mineragraphic studies and electron probe microanalysis reveal that silver exists in two types, i.e., visible silver and invisible silver, with visible silver being dominant. Invisible silver exists in copper minerals in the form of lattice silver besides existing in galena in the form of sub-microinclusions. Visible silver generally replaces sulfides such as bornite and chalcopyrite, or fills in the microsection of sulfides and lodestones in the form of four independent minerals, i.e., hessite, electrum, silver-lead ore and native silver. In the premetallogenic and high temperature phases, the metal ions in the Jiama ore deposit such as Cu, Mo, Au, Pb, Zn, Ag were transported in the form of complex compound. With the lowering of the temperature of metallogenic hydrothermal solution and the rising of the oxygen fugacity and pH value, the complex compound disintegrated due to the falling of its stability. S- and H- complex compounds constituted the main transporting form of Cu, Mo, Au, Pb, Zn, Ag. With the lowering of the temperature, the metal S- and H- complex compounds, such as Cu, Mo complex compounds, started to disintegrate and formed sulfides like molybdenum, chalcopyrite and bornite. And at this time, part of silver was distributed in these sulfides in the form of micro and sub-microinclusions and lattice silver. With the continuous lowering of the temperature, the precipitation of large quantities of Pb and Zn sulfides caused remarkable alteration of the components and properties of metallogenic hydrothermal solution, leading to thorough silver disintegration from S- and H- complex compounds and combination with Cu2+ to form large quantities of independent silver minerals, while the oversaturated silver in the solution was settled in the form of native silver. |
| |
| Keywords: | Jiama features of silver ore body modes of occurrence enrichment mechanism |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《地球学报》浏览原始摘要信息 |
| 点击此处可从《地球学报》下载免费的PDF全文 |
|
