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云南者桑金矿床载金矿物标型特征研究

ISSN号：0258-7106
期刊名称：《矿床地质》
时间：0
分类：P618.51[天文地球—矿床学;天文地球—地质学]
作者机构：[1]地质过程与矿产资源国家重点实验室,中国地质大学地球科学与资源学院,北京100083, [2]成都理工大学地球科学学院,四川成都610059
相关基金：本文得到国家自然科学基金重点项目（编号：40930423）、国家重点基础研究发展计划（973）（编号：2014CB440903）、国家自然科学基金面上项目（编号：41372093）、教育部高校博士点基金项目（编号：2009512212000）、成都理工大学中青年骨干教师培养计划项目、高等教育质量工程项目《矿相学》优秀教材建设（编号：XJCll05）联合资助

作者：代鸿章[1], 陈翠华[2], 顾雪祥[1], 李保华[2], 董树义[2], 程文斌[2]

关键词：地质学, 标型特征, 载金矿物, 者桑金矿床, 滇黔桂“金三角”, geology, typomorphic characteristics, gold-bearing minerals, Zhesang gold deposit, Yunnan- Guizhou-Guangxi gold triangle

中文摘要：

者桑金矿床处在滇黔桂“金三角”构造带中，该矿床的形成经历了沉积成岩期、热液成矿期及表生氧化期，黄铁矿及毒砂为矿床的重要载金矿物。通过岩相学特征、标型矿物研究，发现热液成矿Ⅰ阶段中主要载金矿物为毒砂，热液成矿Ⅱ阶段为金矿化最主要阶段，主要载金矿物为黄铁矿。黄铁矿呈胶状、细粒状、破碎状；毒砂呈粗粒板柱状，维氏硬度偏低为其载金标型。晶胞参数测试表明，黄铁矿“值在5．4300～5．4325A之间，成矿Ⅰ阶段至成矿Ⅱ阶段“值逐渐变大。载金毒砂明显富S、C0亏As，导致b、c、β均低于理论值。各成矿阶段的黄铁矿及毒砂中主量、微量元素及硫同位素组成呈现一定变化规律，成矿物质主要来自于富含有机质的围岩。者桑金矿床为中低温热液矿床。

英文摘要：

The Zhesang gold deposit located in the structural belt of Yunnan-Guizhou-Guangxi gold triangle structural belt. The formation of the Zhesang gold deposit experienced three stages, i.e., sedimentary diagenesis, hy-drothermal mineralization and supergenic oxidation. Pyrites and arsenopyrites are two major Au-bearing miner- als. Petrographic and typomorphic observations reveal that arsennopyrites were formed in the hydrothermal min- eralization Ⅰ phase （HM Ⅰ ） whereas pyrites in the hydrothermal mineralization Ⅱ phase （HM Ⅱ ）, which was the primary gold formation phase. The gold-bearing pyrites are colloidal, fine-gained or fragmentized, while the gold-bearing arsenopyrites are in the coarse columnar form. Both of them have low reflectance. Lattice parame- ter measurement indicates that the a of pyrite is 5. 4300～5. 4325 A, which gradually becomes larger from HM to HM Ⅱ, suggesting that As was concentrated in the hydrothermal mineralization stage. Gold-bearing ar- senopyrites are rich in S, Co and poor in As and, as a result, b, c and β are lower than their theoretical values.Similarities of geochemical and S isotopic compositions between pyrites and arsenopyrites imply that organic wall rock contributed most of the metallogenic materials. It is thus concluded that the Zhesang gold deposit is a mid- dle-low temperature hydrothermal deposit.

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