论文部分内容阅读
本文对内蒙古苏左旗地区的闪长 -花岗岩类进行了精确的 SHRIMP定年研究。研究表明 ,富钠的白音宝力道岩体是一个多期次侵入的复合岩体 ,主体可能是 4 90～ 4 6 4 Ma之间侵位的 ,推测是洋壳俯冲的产物 ;随后在 4 2 4 Ma左右该地区发生了板块的碰撞事件 ,产生具高钾钙碱性系列的花岗岩。该区富钾的包尔汗喇嘛庙岩体本次得到的 SHRIMP年龄为 2 2 2～ 2 0 4 Ma,表明其在晚三叠世侵位 ,可能代表了造山期后的岩石圈拆沉事件。
In this paper, the SHRIMP dating of dioritic-granitoids in Suzuoqi, Inner Mongolia is studied. The study shows that the sodium-rich Baiyinbaolian pluton is a multi-stage intrusive complex rock body, and the host may be emplaced between 4 90 and 464 Ma, presumably the product of subduction of the oceanic crust; A plate collision occurred in the region around 24 Ma, producing granite with a high-K calc-alkaline series. The SHRIMP ages of this K-rich porphyry Lamaite porphyry in this area are 222 to 204 Ma, indicating that it was emplaced during the Late Triassic and may represent lithospheric delamination events after orogeny .