| 西藏多不杂斑岩铜金矿钾长石~(40)Ar/~(39)Ar年龄及其地质意义 |
| |
| 引用本文： | 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~(40)Ar/~(39)Ar年龄及其地质意义[J].现代地质,2012,26(4):656-662. |
| |
| 作者姓名： | 祝向平 陈华安 马东方 黄瀚霄 李光明 刘朝强 卫鲁杰 |
| |
| 作者单位： | 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 |
| |
| 基金项目： | 国家“973”计划项目“青藏高原南部大陆聚合与成矿作用”，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” |
| |
| 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120Ma)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—怒江成矿带 西藏 |
40Ar/39Ar Dating for K-feldspar from Duobuza Porphyry Copper-gold Deposit in Tibet, China and Its Geological Significance |
| |
| ZHU Xiang-ping
,
CHEN Hua-an
,
MA Dong-fang
,
HUANG Han-xiao
,
LI Guang-ming
,
LIU Chao-qiang
,
WEI Lu-jie.40Ar/39Ar Dating for K-feldspar from Duobuza Porphyry Copper-gold Deposit in Tibet, China and Its Geological Significance[J].Geoscience——Journal of Graduate School,China University of Geosciences,2012,26(4):656-662. |
| |
| Authors: | ZHU Xiang-ping CHEN Hua-an MA Dong-fang HUANG Han-xiao LI Guang-ming LIU Chao-qiang WEI Lu-jie |
| |
| Institution: | 1.Chengdu Institute of Geology and Mineral Resources,Chengdu,Sichuan 610081,China;2.No.5 Geological Party, Exploration and Development Bureau of Geology and Mineral of Tibet Autonomous Region,Golmud,Qinghai 816000,China) |
| |
| 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. |
| |
| Keywords: | 40Ar/39Ar age K-feldspathic alteration Duobuza porphyry deposit Bangonghu-Nujiang metallogenic belt Tibet |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
