Dating and Tectonic Significance of Plagiogranite from <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:PlaceName w:st="on">Guoganjianian</st1:PlaceName> <st1:PlaceType w:st="on">Mountain</st1:PlaceType>, Central Qiangtang, Northern Tibet, <st1:country-region w:st="on"><st1:place w:st="on">China</st1:place></st1:country-region> <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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Dating and Tectonic Significance of Plagiogranite from Guoganjianian Mountain, Central Qiangtang, Northern Tibet, China

详细信息

责任者：Shi Jianrong (College of Earth Sciences ; Jilin University ; Changchun 130061 ; China) ; Dong Yongsheng
刊名：Geological Bulletin of China
出版年：2009
卷期：28(9)
关键词：斜长花岗岩 ; plagiogranite ; 铀—铅计时 ; U-Pb dating ; 羌塘盆地 ; Qiangtang Basin
页码：p.1236-1243
图表：7 illus., 2 tables, 22 refs.
分类号：0801
issnNo：ISSN1671-2552
isbnNo：CN11-4648/P

摘要

Plagiogranite is firstly found in the ophiolite in Guoganjianian Mountain. Based on the study of field geological characteristics, petrology, geochemistry and isotope geochronology, the authors suggest the plagiogranite has similar characteristics of adakite, which is high in Al₂O₃(14.84%～15.35%); Sr(338×10^-6～356×10^-6); Sr/Y(Sr/Y=46.94～55.45) and low in Y, Yb(Y=6.42×10^-6～7.20× 10^-6, Yb=0.56×10^-6～0.63×10^-6). Zircon SHRIMP U-Pb dating age is (348±9) Ma and it represents the subduction time of oceanic crust. The above geochemical characteristics indicate that plagiogranite in the Guoganjianian Mountain is the product of direct partial melting of subduction plate in high pressure, and these granites are likely produced in the environment of subduction zone.

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