中国地质2012，Vol.39Issue(6)：1647-1656,10.
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
40Ar-39Ar isotopic age study of phlogopite from Kafang altered basalt in Gejiu of Yunnan Province and its significance
摘要
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.关键词
40Ar-39Ar同位素年龄/金云母/矿化蚀变玄武岩/个旧卡房铜矿Key words
meta-basalt/40Ar-39Ar age/phlogopite/Gejiu分类
天文与地球科学引用本文复制引用
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[J].中国地质,2012,39(6):1647-1656,10.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. （40930419）
