【摘要】 阿尔泰造山带南缘发育一系列后造山花岗岩体。富蕴南额尔齐斯断裂带中发育具有片麻理的黑云母花岗岩体,其中还侵入有未变形的黑云母花岗岩体。本文对这两个岩体进行了 TIMS 法锆石 U-Pb 测年,结果分别为 281±5 Ma(变形岩体)和275±2 Ma(不变形岩体),显示其为后造山花岗岩体。该研究表明,阿尔泰造山带在281± 5 Ma 时仍存在一定规模的后造山剪切作用,275±2 Ma 之后变形作用开始变弱。更多还原

【Abstract】 A series of post-orogenic granite plutons occur on the southern margin of Altay orogenic belt.A gneis- sic deformed granitic pluton occurs in the Ertix faulted zone to the south of Fuyun,intruded by an underformed granitic pluton.The former pluton is dated by U-Pb TIMS method at 281±5 Ma and the latter at 275±2 Ma. These data indicate that shearing deformation still took place to some extent along Ertix zone during ca.280～ 275 Ma in the post-orogenic period.The deformation probably ended or became much weaker after 275±2 Ma.更多还原