Zircon U-Pb Dating and Tectonic Significance of the Shipingchuan Granite in Southeastern <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:PlaceName w:st="on">Zhejiang</st1:PlaceName> <st1:PlaceType w:st="on">Province</st1:PlaceType>, <st1:place w:st="on">SE China</st1:place> <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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weight: bold" lang=EN-US>Zircon U-Pb Dating and Tectonic Significance of the Shipingchuan Granite in Southeastern Zhejiang Province, SE China

详细信息

责任者：Li Yanjun (Faculty of Earth Resources ; China University of Geosciences ; Wuhan 430074 ; China) ; Wei Junhao
刊名：Geological Review
出版年：2009
卷期：55(5)
关键词：花岗岩 ; granite ; 铀—铅计时 ; U-Pb dating ; 浙江 ; Zhejiang Province
页码：p.673-684
图表：8 illus., 4 tables, 56 refs.
分类号：0801
issnNo：ISSN0371-5736
isbnNo：CN11-1952/P

摘要

///The Shipingchuan K-feldspar granite is situated in south—central volcanic belt of southeastern Zhejiang Province. LA-ICP-MS zircon U-Pb dating yields a weighted mean ²⁰⁶Pb/²³⁸U age of (102.5±1.2) Ma (MSDW=2.1) for the Shipingchuan granite intrusion, implying its end of early Cretaceous crystallization time. Petrography and chemical compositions show that it belongs to high-K calc-alkaline series characterized by high silicon, enriched in kalium and aluminum but depleted in iron, magnesium, phosphorus and titanium. SiO₂ and K₂O contents range from 74.79% to 77.79% and 4.26% to 7.97%， respectively. A/CNK values vary from 0.98 to 1.10, indicating a metaluminous to weakly peraluminous character. The rocks are enriched in Rb, Th, U and K, but depleted in Sr, Ba, Nb, P and Ti. The results indicate the Shipingchuan granite is related to back-arc extension due to high angle subduction of the paleo-Pacific plate, caused by northward movement of Indian plate.

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