祁连南缘嗷唠山花岗岩SHRIMP锆石年龄及其地质意义  

Zircon SHRIMP ages of Aolaoshan granite from the south margin of Qilianshan and its geological significance.

作　　者：吴才来[1] 杨经绥[1] TrevorI RELAND Joe WOODEN 李海兵[1] 万渝生[1] 史仁灯[1] 

机构地区：[1]中国地质科学院地质研究所,100037 [2]斯坦福大学

出　　处：《岩石学报》2001年第2期215-221,共7页Acta Petrologica Sinica

基　　金：国家重点自然科学基金项目 ( 4 9732 0 70 );国家 973项目 ( G19980 40 80 0 )

摘　　要：祁连南缘嗷唠山花岗岩锆石的 SHRIMP年龄变化于 44 5～ 496 Ma之间 ,平均为 473Ma,属早奥陶世。该花岗岩的岩石地球化学特征类似于 I型花岗岩 ,有关构造环境判别图解得出 ,该花岗岩类似于岛弧或活动陆缘环境。结合区域地质特征分析 ,该花岗岩是祁连南缘早古生代超高压变质带的一部分 。Zircon SHRIMP ages of Aolaoshan granite from the south margin of Qilian range from 445 Ma to 496 Mat with an averaged age of 473 Mar belonging to the early Ordovician. Geochemically, the granites are similar to I-type granites. Tectonically, the granite was formed in island are based on some discriminated diagrams. Combined with regional geology, authors suggest that the granite was one part of the ultra-high pressure metamorphic belt of the south margin of Qilian and both have a close relationship.

关 键 词：锆石 SHRIMP年龄 花岗岩 超高压变质带 构造环境 早奥陶世 地球化学特征 

分 类 号：P588.121[天文地球—岩石学] P597[天文地球—地质学]