A Primary Discussion on the Age and Genesis of the Jiuqu Two-Mica Granite Related to W—Sn Mineralizations in Southern Jiangxi Province
详细信息
- 责任者：Zhao Xilin (Nanjing Institute of Geology and Mineral Resources ; Nanjing 210016 ; China) ; Mao Jianren
- 刊名：Geological Review
- 出版年：2013
- 卷期：59(1)
- 关键词：钨矿 ; tungsten ores ; 锡矿 ; tin ores ; 二云母花岗岩 ; two-mica granite ; 江西 ; Jiangxi Province
- 页码：p.83-96
- 图表：illus., 5 tables, 56 refs.
- 分类号：1001
- issnNo：ISSN0371-5736
- isbnNo：CN11-1952/P
摘要
The Jiuqu two-mica granite in southern Jiangxi Province, is related to W—Sn mineralizations. The zircon SHRIMP U-Pb and LA-ICP-MS U-Pb dating of the Jiuqu granite gave ages of 169±8Ma and 169.6±0.8 Ma, which shows that the granite was produced in the Middle Jurassic. The Ar-Ar plateau ages of muscovite and K-feldspar are 100.80±0.76 Ma and 169.7±1.2 Ma, respectively. The Ar-Ar anti-isochron ages of muscovite and K-feldspar are 104.1±3.5 Ma and 170.4± 2.2 Ma, respectively. The ages represent the isotopic closure ages of minerals in the rock-forming process. The cooling history of the Jiuqu granitic pluton indicates that the cooling velocity of pluton was faster at the early stage and was slower (about 2.90℃/Ma) at the late stage.The Jiuqu granites are characterized by being riched in Si, alkaline,and poorer in CaO,MgO,TiO2 and P2O5; the DI range from 95.04~95.57,which reflected the higher evolution of magmatism, and belongs to peraluminous high-K—Ca-Alkaline; the REE pattern is slightly light-inclined REE distribution pattern, and has strongly negative Eu, the εNd(t) values of the Jiuqu granite are -9.51 to -10.12, and T2DM values are 1.83 to 1.87Ga. It is belongs to S-type granite, which derived form the partial melting of continental crust metamorphic sedmentary rocks equal to Proterozoic, and lower K/Rb values indicate abundant fluids and suffered high-degree evolution of magmatism, belong to the record of later stage of magmatism.
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