吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (6): 1711-1723.doi: 10.13278/j.cnki.jjuese.201606110

• 地质与资源 • 上一篇    下一篇

西藏柯月Pb-Zn-Sb-Ag多金属矿床I号矿体原生晕地球化学特征

程文斌1,2, 尹力3, 陈翠华1,2, 宋玉坤4, 李关清5, 张兴国5, 夏抱本5, 达瓦次仁5   

  1. 1. 成都理工大学地球科学学院, 成都 610051;
    2. 成都理工大学构造成矿成藏国土资源部重点实验室, 成都 610051;
    3. 成都蒲江县国土资源局, 成都 611630;
    4. 黑龙江省区域地质调查所, 哈尔滨 150036;
    5. 西藏地勘局区域地质调查大队, 拉萨 851400
  • 收稿日期:2016-03-23 出版日期:2016-11-26 发布日期:2016-11-26
  • 作者简介:程文斌(1982),男,讲师,主要从事矿床学、地球化学方面研究,E-mail:haitianyisu@126.com
  • 基金资助:
    教育部高等学校博士学科点专项科研基金项目（20125122120013）；国家自然科学青年基金项目（41302066）；国家自然科学基金面上项目（41372093）；全国矿产资源潜力评价项目（1212010813025，1212011121023）

Geochemical Characteristics of Primary Halos in No. I Ore Body of Keyue Pb-Zn-Sb-Ag Polymetallic Deposit, Tibet

Cheng Wenbin1,2, Yin Li3, Chen Cuihua1,2, Song Yukun4, Li Guanqing5, Zhang Xingguo5, Xia Baoben5, Dawa Ciren5   

  1. 1. College of Earth Sciences, Chengdu University of Technology, Chengdu 610051, China;
    2. Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation, Ministry of Land and Resources, Chengdu University of Technology, Chengdu 610051, China;
    3. Pujiang County Land Resources Bureau, Chengdu 611630, China;
    4. Heilongjiang Province Regional Geological Survey, Harbin 150036, China;
    5. Regional Geological Survey Team, Tibet Bureau of Geology and Exploration, Lhasa 851400, China
  • Received:2016-03-23 Online:2016-11-26 Published:2016-11-26
  • Supported by:
    Supported by Doctoral Fund of Ministry of Education of China (20125122120013), National Natural Science Foundation of China (41302066), National Natural Science Foundation of China (General Program; 41372093) and National Mineral Resources Potential Evaluation Project (1212010813025, 1212011121023)

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摘要： 西藏柯月Pb-Zn-Sb-Ag多金属矿床位于雅鲁藏布江缝合带（IYS）与藏南拆离系（STDS）之间的北喜马拉雅成矿带。该矿床经详查验证，4 300 m以浅的矿体赋存于日当组钙质板岩夹薄层泥晶灰岩中，严格受北东向断裂控制，但深部延伸不明。本文通过该矿床I号矿体原生晕地球化学特征分析，对此问题进行初步探讨。研究表明，前缘晕元素为Hg、As、Tl，近矿晕元素为Pb、Zn、Sb、Ag、Au、Cd、Cu、Mn，尾晕元素为Sn、In、Bi；采用改良的格里戈良分带指数法计算分带序列为In-Mn-As-Cu-Zn-Cd-Bi-Pb-Sn-Hg-Tl-Ag-Au-Sb，重心法计算分带序列为In-Mn-As-Cu-Cd-Zn-Hg-Bi-Sn-Pb-Ag-Sb-Tl-Au；同时，讨论原生晕地球化学参数变化规律，并以各元素的几何平均值累乘比建立矿体的剥蚀参数模型及矿体原生晕叠加理想模型。综合以上分析，推测矿床有多次成矿作用叠加，上部存在剥蚀至尾部的矿体，而深部可能有矿体延伸。

关键词: 原生晕地球化学特征, 分带序列, 多金属矿床, 柯月矿床, 西藏

Abstract: The Keyue Pb-Zn-Sb-Ag polymetallic deposit is located in the Himalaya metallogic belt between the IYS and STDS. The general exploration shows that ore bodies above 4 300 m are mainly distributed in calcareous slate within thin micrite of the Ridang Formation(J1r) and strictly controlled by N-E faults. While deep extension of ore bodies are unknown. Based on the analysis of geochemical characteristics of the primary halos about the No. I ore body, the deep extension is discussed in this paper. Studies show that the frontal elements are Hg, As, Tl and the near-ore indicator elements are Pb, Zn, Sb, Ag, Au, Cd, Cu, Mn and the rear elements are Sn, In, Bi. According to the Grigorian's zoning index method and the barycenter method, the axail zoning downward follows in the sequences of In-Mn-As-Cu-Zn-Cd-Bi-Pb-Sn-Hg-Tl-Ag-Au-Sb (the Grigorian's zoning index method) and In-Mn-As-Cu-Cd-Zn-Hg-Bi-Sn-Pb-Ag-Sb-Tl-Au (the barycenter method). The change rules of the primary halos geochemical parameters are discussed, the erosion parameters models are established by the geometric averages of elements, and the ideal zoning models of the primary dispersion halos is established by comprehensive analysis. In conclusion, the speculative results can be listed as followings. Firstly, there are multiple superposition of mineralization. Secondly, there are ore bodies eroded to tail at the upper section, Thirdly, some ore bodies may extend to the depth.

Key words: geochemical characteristics of primary halos, zoning sequence, polymetallic deposit, Keyue deposit, Tibet

中图分类号: 

  • P618.4
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