地质通报2016，Vol.35Issue(4)：605-613,9.
内蒙古艾勒格庙强过铝质花岗岩定年、地球化学特征及其地质意义
Age and geochemistry of strongly peraluminous granite in Airgin Sum area, Inner Mongolia, and its geological significance
摘要
Abstract
Airgin Sum monzogranite plution is located in western Xilin Gol-Airgin Sum Precambrian block, Inner Mongolia. Its age of 418.5±1.1Ma obtained by LA-MC-ICP-MS U-Pb zircon dating means that Airgin Sum plution was formed at the end of Late Silurian. Its petrology and geochemistry show that Airgin Sum monzogranite is characterized by high silicon (SiO 2 74.22%~75.51%) and rich potassium (K2O 5.41%~5.78%)in association with A/CNK ratios ranging from 1.17 to 1.21, suggesting high-K and calc-al⁃kaline strongly peraluminous granite. The monzogranite is strongly enriched in Rb, Th, U, Pb, K and heavy rare earth elements (Yb 3.74×10-6~9.65×10-6) and is also characterized by depletion of Nb, Ta, Ti and P. It is suggested that the strongly peraluminous mon⁃zogranite was formed in the post-collisional setting and resulted from partial melting of crustal material after exhumation of over-thickened crust. It is thus concluded that the northern orogen in Airgin Sum-Sonidzuoqi had collided between arc and block before Late Silurian, followed by an post-collision and post-orogenic extension setting during Upper Silurian-Middle Devonian.关键词
强过铝质二长花岗岩/LA-MC-ICP-MS锆石U-Pb年代学/地球化学/后碰撞/艾勒格庙Key words
strongly peraluminous monzogranite/LA-MC-ICP-MS zircon U-Pb geochronology/geochemistry/post-collision/Airgin Sum分类
天文与地球科学引用本文复制引用
许雅雯,李承东,赵利刚,高学生,张阔,申宗义..内蒙古艾勒格庙强过铝质花岗岩定年、地球化学特征及其地质意义[J].地质通报,2016,35(4):605-613,9.基金项目
国家自然科学基金项目（批准号41272065）和中国地质调查局项目 （）
