LA-ICP-MS U-Pb Ages, Geochemical Characteristics of the Zircons from Wushanguan Complex Body in Anji Mining Area, Northwestern Zhejiang and Their Geological Significances
详细信息
- 责任者：Tang Yanwen (Institute of Civil and Environmental Engineering ; Beijing University of Science and Technology ; Beijing 100083 ; China) ; Xie Yuling
- 刊名：Geological Review
- 出版年：2013
- 卷期：59(4)
- 关键词：多金属矿 ; polymetallic ores ; 杂岩 ; complexes ; 铀—铅计时 ; U-Pb dating ; 浙江 ; Zhejiang Province
- 页码：p.702-715
- 图表：illus., 3 tables, 56 refs.
- 分类号：1001
- issnNo：ISSN0371-5736
- isbnNo：CN11-1952/P
摘要
As the major granite intrusion in Anji mining area,Wushanguan complex body is composed by four rock units of biotite-monzonitic granite,granodiorite,moyite and fine-grained granite.Zircons from the first three units are analyzed by petrography,cathodoluminescence (CL) and LA-ICP-MS,and the results show that the complex body formed in Late Jurassic and Early Cretaceous,and biotite-monzonitic granite,granodiorite and moyite formed in 141.0±1.4Ma (n=13,MSWD=1.3) ,138.1±1.0Ma (n=14,MSWD=0.92) and 137.0±1.8Ma (n =13,MSWD=1.9) respectively.That two inherence zircons have been found,whose U-Pb ages are 518±9Ma and 624±9Ma respectively,suggests some old crustal materials of Early Caledonian and Late Jinningian were carried in magma by partial melting and (or) assimilation-contamination in the forming process of Wushanguancomplex body.The crystallization temperature of zircons in biotite-monzonitic granite,granodiorite and moyite are ranging from 628～747℃ (with an average of 657℃ ) ,625～715℃ (with an average of 653℃ ) and 618～765℃ (with an average of 698℃) respectively.The passive emplacement of the complex body,tensional and tenso-shear character of NW faults and regional tectonic setting indicate that Anji mining area had been under the extensional environment from 141 to 137Ma,and the diagenesis and mineralization events associated with the complex body are controlled by this setting.Analysis results and some evidences from geological investigation indicate in Anji mining area the polymetallic mineralization and the complex body have a close association in time and space.Anji polymetallic deposit (about 141～134Ma) and Tongshan Sn deposit (about 147～143Ma) in Zhejiang province indicate that anther magmatic-mineralizing event had occurred during Late Jurassic-Early Cretaceous (about 148～134Ma) in East Qinzhou-Hangzhou metallogenic belts.
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