新疆西准噶尔恰其海后碰撞花岗岩  

The Post-Collisional Granite in the Qiaqihai Area,Western Junggar,Xinjiang

作　　者：谭绿贵[1] 

机构地区：[1]皖西学院城市建设与环境系,安徽六安237012

出　　处：《吉林大学学报（地球科学版）》2008年第6期980-987,共8页Journal of Jilin University：Earth Science Edition

基　　金：国家重点基础研究发展规划项目(2001CB409800);安徽省优秀青年科技基金项目(04045063);安徽高校省级自然科学研究项目(KJ2007B057)

摘　　要：恰其海地区地处新疆阿勒泰地区吉木乃县及塔城地区的丰县,其岩体位于哈萨克斯坦—准噶尔板块北缘。岩性主要为肉红色中粗粒黑云母钾长花岗岩,其次为黑云母花岗岩;其岩石地球化学判别为A2型花岗岩,即侵位于板块主碰撞后或后碰撞期的张性构造环境中。恰其海碱长花岗岩锆石SHRIMPU-Pb年龄测定的结果为(290.7±9.3)Ma(1σ),为早二叠世后碰撞岩浆活动的产物,显示恰其海区域就此进入后碰撞阶段伸展构造环境。The Qiaqihai area is located in Jimunai County of Altay district and Hefeng County of Tacheng district, western Junggar of Xinjiang. The area is at the northern margin of Kazakstan-Junggar plate. The Qiaqihai intrusion is mainly pinkish red, middle-coarse grained biotite K-feldspar granite and secondly, biotite granite. They are classified as the A2-type granite based on geochemical discrimination, indicating a tectonic setting at the late period of the major collisional plate or at the extendable period of the post-collisional phase. The SHRIMP U - Pb zircon age for the Qiaqihai alkali-feldspar granite intrusion is （290.7±9.3） Ma （1σ）, representing the product of the post-collision magmatic activity during Early Permian. These show that Qiaqihai area has come into an extension setting of the post-collisional stage since then.

关 键 词：花岗岩 构造环境 恰其海 新疆 

分 类 号：P588.1[天文地球—岩石学]