东昆仑东段清水泉中酸性侵入岩地球化学特征及成因讨论  

Geochemical characteristics and Genesis of Qingshuiquan intermediate-acid intrusive body in the east segment of the eastern Kunlun mountains

作　　者：梁东 赵德怀 华北 王锋 吴浩 梁孝伟 LIANG Dong;ZHAO Dehuai;HUA Bei;WANG Feng;WU Hao;LIANG Xiaowei(Xinjiang Institute of Geological Exploration, China Metallurgical Geology Bureau, Urumqi 830000, Xinjiang, China)

机构地区：[1]中国冶金地质总局新疆地质勘查院,乌鲁木齐830000

出　　处：《地质找矿论丛》2022年第1期58-67,共10页Contributions to Geology and Mineral Resources Research

摘　　要：清水泉侵入体位于青海省沟里地区的北部,处于东昆南造山带的东段,为东昆仑岩浆岩带的组成部分。该侵入体主要为花岗闪长岩和斜长花岗岩,次为闪长岩。不同岩性之间具有清楚的接触界线,花岗闪长岩和斜长花岗岩中含有暗色闪长质包体。岩石化学特征显示,侵入体为富钙中钾的钙碱性系列岩石,是岩浆成因的Ⅰ型花岗岩,形成于与岛弧、大陆弧有关的大陆碰撞环境,推测源于深部基性岩类的部分熔融。稀土元素地球化学特征表明侵入体中各种岩石均为同源岩浆产物,微量元素特征则显示构成侵入体的岩浆与大陆地壳具有较大的亲缘性。研究表明,清水泉侵入体形成于晚古生代—早中生代阿尼玛卿洋壳向北部大陆俯冲碰撞过程中,是由深部基性岩类部分熔融而成的中酸性岩浆侵入体。Qingshuiquan intrusive body is geographically located in the North Gouli area of Qinghai province and geotectonically in the eastern segment of the east Kunlun orogenic belt constituting a part of the east Kunlun Magma belt.It is mainly composed of granodiorite,Plagioclase granite and less diorite with clear boundaries between the different lithologies.Granodiorite and Plagioclase granite enclose dark inclusions of diorite.Petrochemical results show that the intrusive rock belongs to I-type granite,the Ca-rich and K-rich calc-alkaline series formed under continental collision environment related to island arc and continental arc.It is presumed to be derived from partial melting of deep basic rocks.The REE geochemistry is characteristics of cognate material of the different lithologies;the trace element result,it's keen relationship to the continental crust.In summary it is a intermediate-acid intrusive body formed by partial melting of deep basic rocks during subduction of Arnimaqing ocean crust to north in the Late Paleozoic-Early Mesozoic period.

关 键 词：清水泉侵入体 中酸性岩浆岩 地球化学 岩石成因 东昆南构造带 青海省 

分 类 号：P584[天文地球—岩石学] P588.1[天文地球—地质学]