Cooling Process of Granite in <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on">Northwestern Sichuan</st1:place> Province and Its Constraint to Regional Mineralization <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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Cooling Process of Granite in Northwestern Sichuan Province and Its Constraint to Regional Mineralization

详细信息

责任者：Li Jiankang (College of Earth Science and Resource ; Chang’an University ; Xi’an 710054 ; China) ; Yang Xuejun
刊名：Acta Geologica Sinica
出版年：2009
卷期：83(8)
关键词：花岗岩 ; granite ; 金矿 ; gold ores ; 四川 ; Sichuan Province
页码：p.1141-1149
图表：3 illus., 4 tables, 34 refs.
分类号：0801
issnNo：ISSN0001-5717
isbnNo：CN11-1951/P

摘要

Located at north of the Songpan-Garz orogenic zone, northwestern Sichuan hosts a great number of Mesozoic granite bodies and Carlin-type gold deposits. The gold mineralization has an internal relation with the tectonic movement and magmatism. Aiming at the problem, this study analyzed ages of biotite and muscovite from the Yanggonghai monzonitic granite, Dagaizhai monzonitic granite and Ke’eryin two-mica granite using Ar-Ar dating method and yielded the plateau ages of (158.7±1.4) Ma, (185.2±1.4) Ma and (157.6±1.2) Ma, respectively. Combined with these Ar-Ar ages and the ages by other isotope systems, the cooling tracks of major granite bodies in different locations have been drawn. The result show that from the northern orogenic zone to the center of eastern orogenic zone, the emplacement age of granites become young and cooling rates decrease, but at the relatively stable stage of orogenic process the cooling rates decrease distinctly.

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