| 三江北段纳日贡玛花岗闪长斑岩成岩时代的确定及地质意义 |
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| 关键词:granodiorite porphyry Cu-Mo deposit petrogenic age 41.44±0.23Ma time of India-Asia continental collision northern part of the Sanjiang Region |
| 基金项目:中国地质调查局“青海省地质调查综合研究”(编号: 1212010918044); “青海省岩浆岩的时空分布与成矿作用研究工作项目”(编号: 科〔2011〕01-06-02号) |
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| The Petrogenic age of Narigongma Granitic Diorite-porphyry in the Northern Part of the Sanjiang Region and Its Geological Implications |
| The Narigongma porphery molybdenite copper deposit related to intrusive rocks was discovered recently in the northern part of the Sanjiang Region. U-Pb dating shows that the formation age of Narigongma granodiorite porphyry is 41.44?0.23 Ma, belonging to early Himalayan period. Metallogenic ages of the Narigongma porphery molybdenite copper deposit are mainly in the range of 40.8?0.4 Ma～40.86?0.85 Ma. During multiperiodic hydrother-mal activities and multistage ore-forming processes, the metallogenetic hydrothermal solution was provided by Narigongma granitite porphyry (41.53?0.24 Ma), Narigongma granite diorite-porphyry (41.44?0.23 Ma) and Narigongma plagioclase porphyry (41.00?0.18 Ma). Due to occurrence of many intermediate-acid mass, the age of these intrusive bodies provide evidence for collision function between India plate and Eurasian plate in 65～45 Ma, which has theoretical and practical meaning to forecast of porphyry copper-molybdenum deposit in the region. |
| SONG Zhong-bao,JIA Qun-zi,CHEN Xiang-yang,CHEN Bo,ZHANG Yu-lian,ZHANG Xiao-fei,QUAN Shou-cun,LI Ya-zhi.2011.The Petrogenic age of Narigongma Granitic Diorite-porphyry in the Northern Part of the Sanjiang Region and Its Geological Implications[J].Acta Geoscientica Sinica,32(2):154-162. |
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