西藏多不杂斑岩铜金矿钾长石40Ar/39Ar年龄及其地质意义

现代地质 ›› 2012, Vol. 26 ›› Issue (4): 656-662.

西藏多不杂斑岩铜金矿钾长石⁴⁰Ar/³⁹Ar年龄及其地质意义

祝向平¹, 陈华安¹, 马东方¹, 黄瀚霄¹, 李光明¹, 刘朝强², 卫鲁杰²

1成都地质矿产研究所，四川成都610081；2西藏自治区地质矿产勘查开发局第五地质大队, 青海格尔木816000

收稿日期:2011-11-15 修回日期:2012-04-26 出版日期:2012-08-18 发布日期:2012-08-24
作者简介:祝向平，男，助理研究员，博士，1979年出生，矿物学、岩石学、矿床学专业，主要从事矿床学研究。 Email: zhuxiangping3@yahoo.com.cn。
基金资助:
国家“973”计划项目“青藏高原南部大陆聚合与成矿作用”(2011CB403100)；中国地质调查局地质矿产调查评价专项“班公湖—怒江成矿带铜多金属矿成矿规律综合研究”(1212011086074)。

⁴⁰Ar/³⁹Ar Dating for Kfeldspar from Duobuza Porphyry Coppergold Deposit in Tibet, China and Its Geological Significance

CHU Xiang-Beng^-1, CHEN Hua-An^-1, MA Dong-Fang^-1, HUANG Han-Xiao^-1, LI Guang-Meng^-1, Liu-Chao-Jiang^-2, WEI Lu-Jie^-2

1Chengdu Institute of Geology and Mineral Resources, Chengdu, Sichuan610081, China；2No5 Geological Party,
Exploration and Development Bureau of Geology and Mineral of Tibet Autonomous Region, Golmud, Qinghai816000, China

Received:2011-11-15 Revised:2012-04-26 Online:2012-08-18 Published:2012-08-24

摘要/Abstract

摘要：

西藏多不杂斑岩铜金矿是在班公湖—怒江成矿带发现的第一个斑岩型矿床。通过对多不杂矿床蚀变钾长石进行⁴⁰Ar/³⁹Ar年代学测试获得，蚀变钾长石的坪年龄为(118.31±0.60)Ma，反等时线年龄为(118.30±0.79)Ma，它们代表多不杂矿床钾化蚀变的年龄为119~118 Ma，与成矿年龄同期。多不杂矿床形成的岩浆-热液过程为，由岩浆期(约120 Ma)演化至钾化和成矿期(119~118 Ma)，再演化至绢英岩化期(118~115 Ma)。

关键词: ⁴⁰Ar/³⁹Ar年龄, 钾长石化, 多不杂斑岩铜矿, 班公湖&mdash, 怒江成矿带, 西藏

Abstract:

Duobuza porphyry coppergold deposit is a newly discovered deposit, which is located in the middle of Tibet plateau and in the west of BangonghuNujiang metallogenic belt. K-feldspar from the potassic alteration zone was analyzed by ⁴⁰Ar/³⁹Ar dating technique, and these results yielded a plateau age of (118.31±0.60) Ma and a reverse isochron age of (118.30±0.79) Ma with initial 40Ar/36Ar=291±17, indicating that potassic alteration age in Duobuza porphyry deposit ranges from 119 to 118 Ma and coincide with the mineralization age (molybdenite Re-Os age, 119-118 Ma ). The magmatichydrothermal evolution of Duobuza deposit should be from magmatic stage (around 120 Ma) to potassic alteration and mineralization (119-118 Ma), then to phyllic alteration (118-115 Ma), and the duration of magmatichydrothermal evolution probably persisted 5 million years.

Key words: ⁴⁰Ar/³⁹Ar age, Kfeldspathic alteration, Duobuza porphyry deposit;BangonghuNujiang metallogenic belt, Tibet

祝向平, 陈华安, 马东方, 黄瀚霄, 李光明, 刘朝强, 卫鲁杰. 西藏多不杂斑岩铜金矿钾长石⁴⁰Ar/³⁹Ar年龄及其地质意义[J]. 现代地质, 2012, 26(4): 656-662.

CHU Xiang-Beng, CHEN Hua-An, MA Dong-Fang, HUANG Han-Xiao, LI Guang-Meng, Liu-Chao-Jiang, WEI Lu-Jie. ⁴⁰Ar/³⁹Ar Dating for Kfeldspar from Duobuza Porphyry Coppergold Deposit in Tibet, China and Its Geological Significance[J]. Geoscience, 2012, 26(4): 656-662.

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西藏多不杂斑岩铜金矿钾长石⁴⁰Ar/³⁹Ar年龄及其地质意义

⁴⁰Ar/³⁹Ar Dating for Kfeldspar from Duobuza Porphyry Coppergold Deposit in Tibet, China and Its Geological Significance

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