Discovery of Middle Silurian Adakite Granite and Its Tectonic Significance in Liuyuan Area，Beishan Mountains，NW China
详细信息
- 责任者：Mao Qigui (State Key Laboratory of Lithospheric Evolution ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Xiao Wenjiao
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(2)
- 关键词：埃达克岩 ; adakite
- 页码：p.584-596
- 图表：8 illus., 4 tables, 90 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The gneiss granitiod in Liuyuan area of the Beishan Mountains belongs to the calc-alkaline serious, characterized by having relative high SiO2，Al2O3 and relative low MgO contents，Na2O>K2O；enriched in Sr and high Sr/Y ratios；relatively strong REE segregation and depleted HREE (Yb and Y)，only weak negative Eu negative；enriched in LREE and LILE，depleted in HREE and HFSE(Nb、Ta)，is similar to the typical adakites formed by melting of the oceanic slab subduction．However，the isotopic compositions of the adakite rocks are more radiogenic than most typical depleted adakites．These isotopic differences from typical adakites are attribute to participation of the crustal and/or sedimentary components in the magma source and/or the inheritance of a more radiogenic oceanic slab (OIB/E-MORB) of the source，and contaminated by crustal component in the intruded process．
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