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贵州贞丰烂泥沟卡林型金矿床含砷黄铁矿Re-Os同位素测年及地质意义

ISSN号：0371-5736
期刊名称：《地质论评》
时间：0
分类：P618.87[天文地球—矿床学;天文地球—地质学]
作者机构：[1]中国地质科学院矿产资源研究所,北京100037, [2]Sino Gold Mining Limited,悉尼 NSW2000澳大利亚, [3]国家地质实验测试中心,北京100037, [4]广西地勘局271地质队,广西临桂541100, [5]中国地质大学北京,北京100083
相关基金：本文为国家自然科学重点基金资助项目（编号40434011）、国家自然科学基金资助项目（编号40572062）和Sino Gold Mining Limited（Australia）资助的成果.致谢：感谢李晓峰博士,谢桂青博士,叶会寿博士,陆刚工程师的讨论.野外工作期间,得到了贵州锦丰矿业有限公司地质部方策、陈文斌、吕思灏、宋正刚及其他员工的大力支持,谨致谢忱.

作者：陈懋弘[1,2], 毛景文[1], 屈文俊[3], 吴六灵[2,4], Phillip J. UTTLEY[2], Tony NORMAN[2], 郑建民[5], 秦运忠[2]

关键词： RE-OS年龄, 含砷黄铁矿, 卡林型金矿, 微细粒浸染型金矿, 贵州贞丰烂泥沟(锦丰)金矿, Re-Os isotopic dating, postcollision, arsenian pyrite, Carlin-type gold deposits, Lannigou （Jinfeng）, Guizhou

中文摘要：

贵州贞丰烂泥沟金矿（现称锦丰金矿）是滇黔桂“金三角”已知最大的卡林型金矿床，矿体赋存于断层破碎带内，最主要的载金矿物是具环带结构的含砷黄铁矿。本文运用Re-Os同位素法对该矿床的9个含砷黄铁矿样品进行了两次测试，成功获得10^-9～10^-12。级Re-Os同位素数据：Re 0．1257～1．233ng／g，Os 6．75～33．50 pg／g，等时线年龄为193±13Ma，反映其成矿时代为早侏罗世。等时线的初始n（^187Os）／n（^188Os）值为1．127±0．043，指示成矿物质来源于地壳而不是地幔。结合其他资料，初步建立其成矿模式为：盆地流体不断地从沉积物中萃取出包括金在内的成矿组分，形成含矿流体。印支期挤压造山期间，含矿流体沿不整合接触面和同生断层向上运动，造山后的伸展含矿流体进入减压扩容空间沉淀形成超大型金矿床。成矿作用发生在从印支期挤压造山向燕山期伸展转变的构造转换期。该模式与本文得到的成矿年龄和初始比值相吻合。

英文摘要：

The Lannigou gold deposit, also be called Jinfeng gold deposit, is the largest known Carlin-type gold deposit in Yunnan-Guizhou -Guangxi triangle area in southwestern China. Orebodies are tightly confined to faults, known locally as the F3 and F2. The primary hosts mineral for Au are arsenian pyrites characterized by zonal structure. Re-Os dating on 9 arsenian pyrites from ores were analyzed in two times respectively, and yielded data as follows： Re range from 0. 1257 to 1. 233 ng/g, Os, from 6.75 to 33.50 pg/g. Corresponding isochron age is 193±13 Ma, which demonstrates mineralization age of gold was early Jurassic. Initial n （^187Os）/n （^188 Os） rate is 1. 127±0. 043, which suggests that the ore-forming materials originated from the crust, but not from the mantle. Genetic modal is proposed that basin fluid continuously extracted materials including Au from basin sediment, and then become ore-containing fluid. The ore-containing fluid moved upward along unconformity between basin and platform and contemporaneous faults during latter Triassic collisional compression. Ore-containing fluid came into decompressional dilatant zone and gold deposited and formed supper-large gold deposit during early Jurassic extension. Large scale gold metallogeny occurred at the transition from collisional compression to extension tectonic. This model matches the metallogeny age and initial rate.