新疆萨吾尔地区两类花岗岩稀土元素特征  

Rare Earths in Two Types of Granites in Sawuer Region,Xinjiang

作　　者：袁峰[1] 周涛发[1] 谭绿贵[1] 范裕[1] 岳书仓[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《中国稀土学报》2005年第5期631-635,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家重点基础研究发展规划项目(2001CB4098);安徽省优秀青年科技基金项目(04045063)

摘　　要：研究萨吾尔地区两类花岗岩(A型、I型)的稀土元素特征。两类花岗岩的稀土元素地球化学特征明显不同,这与其所处的不同后碰撞构造演化阶段密切相关。森塔斯岩体和沃肯萨拉岩体为形成于后碰撞阶段晚期挤压-拉张转换体制下的I型花岗岩,稀土元素特征显示其岩浆演化过程中分离结晶作用不发育,具幔源特征。阔依塔斯岩体和恰其海岩体为形成于后碰撞结束阶段拉张体制下的A型花岗岩,稀土元素特征显示其岩浆演化过程中分离结晶作用发育,其稀土元素显示的一定的壳源特征应为幔源岩浆受地壳物质混染所致。The geochemical characteristics of rare earth elements of A type and I type granites from the Sawuer region were studied, Xinjiang. The characteristics of two types of granites are different, since A type and I type-granites which formed at different stage of the post-collisional period. The Sentasi intrusion and Wokensala intrusion are the I type granites formed at the late of post-collisional period, and there was extrusion transtating to extension stress. The characteristics of rare earth elements show that the fractional crystallization of the I type granites is indistinct, and the sources of the I type granites come from the mantle. The Kuoyitasi intrusion and Qiaqihai intrusion are the A type granites which formed at the end of postcollisional period, and there was extension stress. The characteristics of rare earth elements show that the fractional crystallization of the A type granites is distinct. The sources of the A type granites come from the mantle but interfused by the crust.

关 键 词：花岗岩 后碰撞 萨吾尔 新疆 稀土 

分 类 号：P618.51[天文地球—矿床学] P595[天文地球—地质学]