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

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...

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

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.