您的位置:首页  > 论文页面

帕米尔构造结新生代塔什库尔干A型花岗岩的厘定和成因

发表时间:2012-11-15  浏览量:970  下载量:493
全部作者: 柯珊
作者单位: 中国地质大学地质过程与矿产资源国家重点实验室,中国地质大学(北京)地球科学与资源学院
摘 要: 通过对塔什库尔干碱性杂岩代表性岩体——苦子干杂岩的野外地质、岩相学和地球化学进行特征研究,认为塔什库尔干杂岩属于A型花岗岩类。同国内外典型A型花岗岩相比,该岩体有着自身的特点,主要受控于源区物质和熔融过程。该A型花岗岩类系加厚下地壳镁铁质榴辉岩的部分熔融,形成的过程中斜长石已不稳定存在,而且残余的矿物组合中石榴石为主要矿物。根据该A型花岗岩的特征和产出的特殊构造背景,该A型花岗岩是在造山过程中局部拉张条件下形成的,即在青藏高原总体为挤压的背景下,喀喇昆仑大断裂的强烈走滑运动形成。因此,造山带A型花岗岩的出现不一定意味着造山作用的结束,也可以在造山过程中产生,但必须具备拉张环境。
关 键 词: 地质学;帕米尔构造结;塔什库尔干碱性杂岩;苦子干杂岩;A型花岗岩类
Title: Ascertainment and petrogenesis of Cenozoic Taxkorgan A-type granitoids in Pamir syntax
Author: KE Shan
Organization: State Key laboratory of Geological Processes and Mineral Resources, China University of Geosciences, School of Earth Science and Mineral Resources, China University of Geosciences (Beijing)
Abstract: Taxkorgan alkaline complex is confirmed to be A-type granitoids based on filed observation, petrography and geochemistry research of Kuzigan complex which is a representative pluton of Taxkorgan alkaline complex. Compared with typical world A-type granites, this complex has its own special characteristics, mainly controlled by its source rocks and melting conditions. Taxkorgan A-type granitoids were the product of partial melting of mafic eclogite at the base of the thickened crust, with no plagioclase in the source but garnet in the residue. Because of its special tectonic setting, this kind of A-type granitoids was not formed at the end of orogeny. It is a magmatic product induced by the regional extension during the orogenic process, such as large scaled strike-slip movement of the Karakorum fault.
Key words: geology; Pamir syntax; Taxkorgan alkaline complex; Kuzigan complex; A-type granitoids
发表期数: 2012年11月第21期
引用格式: 柯珊. 帕米尔构造结新生代塔什库尔干A型花岗岩的厘定和成因[J]. 中国科技论文在线精品论文,2012,5(21):2045-2054.
 
0 评论数 0
暂无评论
友情链接