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东准噶尔贝勒库都克铝质A型花岗岩岩石化学特征

发表时间:2009-05-15  浏览量:1360  下载量:656
全部作者: 杨高学,李永军,司国辉,吴宏恩,张永智,金朝
作者单位: 长安大学地球科学与资源学院;陕西西安地质矿产勘查开发院;新疆维吾尔自治区有色地质矿产勘查院
摘 要: 新疆东准噶尔卡拉麦里地区是一个重要的锡成矿带,分布有多种类型花岗岩,其中黑云母花岗岩长期以来被认为是S型花岗岩。研究表明:贝勒库都克黑云母花岗岩具有高硅、低铝、贫钙镁、富碱的特征,FeOt/MgO值高,明显不同于典型的I型和S型花岗岩,属于典型的铝质A型花岗岩。这些黑云母花岗岩不是直接来源于亏损地幔,而更可能是源自地幔且被深埋的年轻地壳物质部分熔融和结晶分异作用的产物。花岗岩微量元素构造判别图显示它们是一种后碰撞花岗岩,标志晚石炭世卡拉麦里地区造山作用的结束和板内构造演化的开始。
关 键 词: 地球化学;铝质A型花岗岩;地质意义;贝勒库都克;东准噶尔
Title: Chemical feature and tectonic significance of the Beilekuduke aluminous A-type granite in Kalamaili area, East Junggar
Author: YANG Gaoxue, LI Yongjun, SI Guohui, WU Hongen, ZHANG Yongzhi, JIN Zhao
Organization: College of Earth Science and Resources, Chang’an University;Institute of Geology and Mineral Resources Exploration and Development;Xinjiang Institute of Geological Exploration for Nonferrous Resouries
Abstract: The research area is a tin metallogenic belt in Kalamaili region, East Junggar, Xinjiang, which is distributed with many types of granites, wherein the Beilekuduke biotite granites there have been perceived as S-type for a long period. The preliminary research showed that the biotite granites were actually typical aluminous A-type granites obviously different from the typical I-type and S-type characterized by high silicon content, low aluminum content, depleted calcium and magnesium, abundant alkali, and high FeOt/MgO. The biotite granites were not directly derived from depleted mantle, but were probably the products of partial melting and crystallization differentiation of deep-buried young crustal materials derived from the mantle. Trace elements in granite tectonic discriminant diagram showed that they were a kind of post-collisional granite, symbolizing the end of orogenesis and the beginning of plate tectonic evolution of the Late Carboniferous Kalamaili district.
Key words: geochemistry; aluminous A-type granite; geology significance; Beilekuduke; East Junggar
发表期数: 2009年5月第9期
引用格式: 杨高学,李永军,司国辉,等. 东准噶尔贝勒库都克铝质A型花岗岩岩石化学特征[J]. 中国科技论文在线精品论文,2009,2(9):920-926.
 
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