Zircon U-Pb Dating for the Magmatic Rocks in the Chalukou Porphyry Mo Deposit in the Northern Great Xing’An Range, China, and Its Geological Significance
详细信息
- 责任者：Liu Jun (Key Laboratory of Metallogeny and Mineral Assessment ; MLR ; Institute of Mineral Resources ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Mao Jingwen
- 刊名：Acta Geologica Sinica
- 出版年：2013
- 卷期：87(2)
- 关键词：斑岩钼矿床 ; porphyry molybdenum deposit ; 铀—铅计时 ; U-Pb dating ; 大兴安岭 ; Greater Hinggan Mountains
- 页码：p.208-226
- 图表：illus., 1 table, 89 refs.
- 分类号：1001
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
The superlarge Chalukou porphyry Mo deposit, located in the northern Great Xing’an Range, is the biggest Mo deposit in NE China. Its ore bodies are mainly hosted in the intermediate-acid complex and Jurassic volcanic sedimentary rocks, of which granite porphyry, quartz porphyry and fine grained granite are closely associated with Mo mineralization. The high precision LA-ICP-MS zircon U-Pb dating method has been applied to measure the ages of the monzogranite, granite porphyry, quartz porphyry, fine grained granite, rhyolite porphyry, diorite porphyry and andesite porphyry in the Chalukou deposit, corresponding the dated ages of 162±1.6 Ma, 149±4.6 Ma, 148±1.6 Ma, 148±1.2 Ma, 137±3.3 Ma, 133±1.7 Ma and 132±1.6 Ma, respectively. There exist at least three magma activities in the Chalukou deposit. The sequences of the magma activities in the Chalukou deposit are from Jurassic volcanic sedimentary rocks and monzogranite, through late Jurassic granite porphyry, quartz porphyry and fine grained granite, to early Cretaceous rhyolite porphyry, diorite porphyry and andesite porphyry. The Chalukou porphyry Mo deposit formed at the late Jurassic, and was the product of the NE Asia intracontinental tectonic-magma activities, with metallogenesis occurring in a transitional tectonic setting from compression to extension caused by subduction of the Paleo-Pacific Oceanic plate, which is consistent with large scale Mo mineralization epoch in the east of China.
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