滇西地区临沧花岗岩成因及地质意义  

Genesis and Geological Significance of Lincang Granite in Western Yunnan

作　　者：陈开煌 

机构地区：[1]桂林理工大学地球科学学院,广西 桂林

出　　处：《地球科学前沿(汉斯)》2024年第12期1489-1496,共8页Advances in Geosciences

摘　　要：三江地区临沧花岗岩基是研究古特提斯洋俯冲和闭合的关键所在,然而其岩浆成因和构造属性一直存在较大的争议,严重制约了我们对古特提斯洋与保山地块和思茅地块构造耦合关系的认识。本文对临沧花岗岩基的总体侵位时代、构造背景及侵位驱动机制进行了讨论。在上述基础上提出临沧晚三叠世花岗岩形成于思茅地块与保山地块的后碰撞伸展阶段,板片断离是这一岩浆活动的驱动机制,为古特提斯洋闭合时间提供了新的约束。The Lincang granite foundation in Sanjiang area is the key to the study of the subduction and closure of the ancient Tethys Ocean. However, its magmatic origin and tectonic properties have been greatly disputed, which seriously restricts our understanding of the structural coupling relationship between the Ancient Tethys Ocean and the Baoshan Block and the Simao Block. This paper discusses the overall emplacement age, tectonic setting and emplacement driving mechanism of Lincang granite base. On the basis of the above, it is proposed that the Late Triassic granite in Lincang was formed in the post-collision extension stage of Simao Block and Baoshan Block, and the Slab break-off is the driving mechanism of this magmatic activity, which provides a new constraint for the closing time of the ancient Tethys Ocean.

关 键 词：古特提斯洋 三江地区 板片断离 临沧花岗岩基 晚三叠世 

分 类 号：P59[天文地球—地球化学]