Discussion on the Petrogenesis and Tectonic Setting of Beidaban Granitic Pluton in
详细信息
- 责任者：Huang Zengbao (College of Earth Sciences ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Li Baohua
- 刊名：Journal of Mineralogy and Petrology
- 出版年：2010
- 卷期：30(4)
- 关键词：花岗岩 ; granite ; 构造环境 ; tectonic setting ; 祁连山 ; Qilian Mountains
- 页码：p.62-68
- 图表：2 illus., 2 tables, 18 refs.
- 分类号：0801
- issnNo：ISSN1001-6872
- isbnNo：CN51-1143/TD
摘要
Baidaban granite pluton in the Baidaban area of North Qilian Mountain mainly consisted of monzonite granite. Chemical analysis of rocks showed that these rocks are characteristic of high SiO2(63.66%～74.38%) and K2O/Na2O(2.61～3.31), and low aluminous, belonging to high K calc-alkaline granite series. The normalized REE-patterns revealed LREE enrichment with unconspicuous Eu negative abnormity (δEu=0.61～0.82). Multi-element normalized spider diagrams showed that they were rich in LILE (Rb, Th, K) and poor in HFSE (Y, Yb, Ta and Nb), similar to the typical continent-continent syn-collisional granite. These geochemical characteristics were similar to syn-collisional granites of occurred in Jinfosi of northern Qilian with a U-Pb ages of (414±4) Ma. It was considered that the tectonic setting of this pluton belonged to syn-collision accompanied by granite melting from lower crust.
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