新疆于田普鲁一带早古生代花岗岩岩石地球化学特征及构造意义  

Geochemical Characteristics of Early Paleozoic granites in the Pulu area,Yutian,Xinjiang and its tectonic significance

作　　者：王炬川 韩芳林[1] 崔建堂[2] 张俊良 

机构地区：[1]陕西省地质勘查局区域地质调查研究院,陕西咸阳712000 [2]长安大学,陕西西安710054

出　　处：《地质通报》2003年第3期170-181,共12页Geological Bulletin of China

基　　金：中国地质调查局1:25万于田幅区域地质调查项目成果之一。

摘　　要：昆仑山北缘于田地区发育有大量的早古生代花岗岩,通过开展1∶25万于田县幅区域地质调查工作,将其划分为2个岩浆岩带,进一步细分为4个岩石系列。岩石组合及岩石地球化学特征的研究表明,南带石英闪长岩系列的岩浆主要来自于地幔,是俯冲作用的产物,其中似斑状二长花岗岩系列的岩浆主要来源于下地壳,是碰撞造山作用中壳幔相互作用的共同产物;北带正长花岗岩系列和英云闪长岩系列的岩浆则主要来源于下地壳或地幔,形成于造山后的伸展体制。整个早古生代岩浆岩的发展演化过程,直接、客观地反映了北昆仑和南昆仑板块的运动学特征。Large amounts of Early Paleozoic granite are developed in the Yutian area on the northern margin of the Kunlun Mountains.On the basis of 1∶250000regional geological survey of the Yutian Sheet,two magmatic belts with distinct characteristics may be distinguished,which may be further divided into four rock series.Through studies of their rock associations and geochemical characteristics,the authors propose the following view:in the southern belt,the magma of the quartz diorite series was mainly de-rived from the mantle and is the product of subduction and the magma of the porphyroid monzogranite series mainly originated from the lower crust,being the product of the interaction of crust and mantle in collisional orogeny;in the northern belt,the magma of the syenite granite series and tonalite series mainly came from the lower crust or mantle and originated in a post-orogenic extensional regime.

关 键 词：花岗岩 早古生代 岩带 系列 探讨成因 形成环境 

分 类 号：P588.121[天文地球—岩石学] P595[天文地球—地质学]