扬子板块西南部古元古代岩浆、变质事件及其构造意义

The crystalline basement outcrops in the southwestern portions of the Yangtze Block are expected by many geologists, but only found in Cuoke Village, Shiping County, Yunnan Province recently. It has great significance to study early Precambrian magmatic and metamorphic events, evolution history of the southwest Yangtze Block. Due to the lack of high-precision geochronological and detailed field geological studies, the crystalline basement's nature and tectonic affinity have been poorly understood so far. This project will focus on geochronological, geochemical, and petrology research from the crystalline basement in Shiping County, Yunnan Province, with the purpose for identifying rock associations, constraining the ages and metamorphic, and providing important constraints on the tectonic affinity. These studies will preliminarily clarify the tectonic affinity, magmatic and metamorphic events of crystalline basement in the southwest Yangtze Block, and provide important constraints on the tectonic affinity of the Yangtze Block and its location in the paleocontinent reconstruction.

寻找扬子板块西南地区结晶基底一直是众多地质学者的目标，至今仅近期在云南石屏撮科村附近发现早前寒武纪结晶基底，这一发现对探讨扬子板块西南部早期岩浆活动、变质期次及演化历史具有重要的意义。但由于缺少更多的高精度年代学资料和系统性的研究工作，该结晶基底的性质和构造属性尚待深入研究。本项目拟以云南石屏地区的早前寒武纪结晶基底为研究对象，以岩石学、地球化学、地质年代学为主要研究手段，以期查明早前寒武纪结晶基底岩石组合和接触特征，厘定各类岩浆岩的时代和变质期次，确定结晶基底的构造属性和深部物质组成。初步构建本区早前寒武纪结晶基底的构造-岩浆-变质演化历史，进而对扬子板块的亲缘性及其在古大陆重建中的位置进行探索研究。