A-Type Granites Along With Shoshonitic Rocks in the Luzong Area <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

A-Type Granites Along With Shoshonitic Rocks in the Luzong Area

详细信息

责任者：Xiang Wenshuai (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Du Yangsong
刊名：Journal of Mineralogy and Petrology
出版年：2009
卷期：29(3)
关键词：A型花岗岩 ; A-type granite ; 安粗岩 ; latite ; 安徽 ; Anhui
页码：p.36-42
图表：6 illus., 1 table, 45 refs.
分类号：0810
issnNo：ISSN1001-6872
isbnNo：CN51-1143/TD

摘要

Luzong area (Lujiang and Zongyang) was famous for its two significant petrological associations, the Luzong shoshonitic volcanic rocks and the Anlu A-type granites. Their petrology, lithochemistry and trace element geochemistry revealed that, though, the rock series changed from shoshonite to quartz syenite, syenite and alkaline-feldspar granite, they did not belong to ultrapotassic rocks (K2O/Na₂O<₂, ω(MgO)<3%). Trace elements and REE geochemical data were in a same pattern (enriching in LILE such as Rb, Th, poor in HFS like Ti, also rich in LREE); and their major element data revealed that these two rock types were formed by crystallization differentiation from the same magma chambe. Taking the tectonic environment into consideration, the A-type granites, which are younger than shoshonite, represent the end of this magmatic evolution.

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