云南个旧卡房蚀变玄武岩金云母40Ar-39Ar同位素年龄研究及意义

张娟; 毛景文; 程彦博; 李肖龙

云南个旧卡房蚀变玄武岩金云母40Ar-39Ar同位素年龄研究及意义

1.
中国地质大学地球科学与资源学院，北京100083
2.
中国地质科学院矿产资源研究所，北京100037
3.
School of Earth and Environmental Sciences, James Cook University, Townsville 4811

基金项目: 国家自然科学基金重点项目(40930419)、国土资源部公益性行业科研专项(200911007-12)、云南锡业集团有限责任公司科研项目(2010-04A)及中国地质调查局地质调查项目(1212011120994)资助。

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- 刊出日期: 2012-12-24

40Ar-39Ar isotopic age study of phlogopite from Kafang altered basalt in Gejiu of Yunnan Province and its significance

1.
School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China
2.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
3.
School of Earth and Environmental Sciences, James Cook University, Townsville 4811, Australia

摘要

摘要: 提要：云南个旧锡铜多金属矿床是世界级超大型矿床，个旧矿集区内与蚀变玄武岩有关的（似）层状铜矿床是其重要的矿床类型。该类型矿床的围岩玄武岩均发生蚀变，且蚀变强度与矿化关系密切。本文对个旧卡房矿化玄武岩中的金云母进行40Ar-39Ar同位素定年分析，得到其坪年龄为（85.49±0.63）Ma，等时线年龄为（85.62±0.42）Ma，反等时线年龄为（85.59±0.81）Ma，三者基本一致，代表了变玄武岩的蚀变年龄及同期矿化年龄，属于晚白垩世，可与个旧锡铜多金属矿床的成矿时代进行对比。
- 40Ar-39Ar同位素年龄 /
- 金云母 /
- 矿化蚀变玄武岩 /
- 个旧卡房铜矿
Abstract: Abstract：The Gejiu polymetallic tin ore district in Yunnan Province is the largest tin deposit in the world, and the Kafang copper (tin) deposit is a component part of this ore district. The stratoid ore body of the Kafang copper (tin) deposit, closely related to meta-basalt, is characterized by enriched copper. The basalt has been altered and the alteration intensity is related to the copper mineralization. This paper presents a new 40Ar-39Ar phlogopite age for the meta-basalt in the Kafang tin-copper deposit in order to constrain the timing and duration of the alteration of basalt and the mineralization. Phlogopite yielded 40Ar-39Ar plateau age of 85.49±0.63 Ma, isochronal age of 85.62±0.42 Ma, and inverse isochronal age of 85.59±0.81 Ma. These ages are substantially consistent with each other, pointing to late Cretaceous. These results are coincident with the data obtained from the Gejiu polymetallic tin-copper deposit.
- meta-basalt /
- 40Ar -39Ar age /
- phlogopite /
- Gejiu

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云南个旧卡房蚀变玄武岩金云母40Ar-39Ar同位素年龄研究及意义

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40Ar-39Ar isotopic age study of phlogopite from Kafang altered basalt in Gejiu of Yunnan Province and its significance

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出版历程

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