白城晚二叠世二长花岗岩地质特征、年代学及其地质意义

The geological features,chronology and geological significance of Late Permian adamellite in Baicheng area

本文通过对白城地区那金-岭下-瓦房一带出露的二长花岗岩进行年代学和地球化学研究,并探讨了其成因及形成的构造背景。研究表明,白城那金岭下岩体主要岩石类型为二长花岗岩。本次工作取得单点测年数据为(275±4.6)Ma、(254±3.0)Ma,形成于晚二叠世。为过铝质钙碱性系列,认为与古亚洲洋闭合同碰撞造山密切相关。

In this paper,based on the chronological and geochemical studies of adamellite in the Najin-Lingxia-Wafang area in Baicheng,the genesis and structural background of its formation are discussed.Studies have shown that the main rock type of the Najin-Lingxia rocks in Baicheng area is adamellite.The single-point dating data obtained in this work are(275±4.6)Ma and(254±3.0)Ma,which were formed in the Late Permian.It is peraluminescent calcium alkaline series,which is believed to be closely related to syn-collisional orogeny during closure of the ancient Asian Ocean.