滇西昌宁混杂岩带的地质特征

发布时间：2018-05-27 03:19

本文选题：昌宁-孟连带 + OIB型变玄武岩　；参考：《成都理工大学》2015年硕士论文

【摘要】：长期以来昌宁-孟连结合带一直是国内外地质专家、学者进行古特提斯洋构造演化研究的热点地区,通过多年的研究工作,新的发现、新的认识层出不穷,极大的提高了该区的研究。但是,对昌宁-孟连结合带原型沉积盆地的大地构造性质、规模和演化历史,不同的学者和专家有不同的认识和理解。滇西昌宁混杂岩带属于昌宁-孟连结合带的北延部分,该混杂岩带呈北西-南东走向,东侧与崇山岩群、三叠纪的花岗闪长岩呈断层接触,西侧与西盟岩群,喜鹊林组呈断层接触。通过对滇西昌宁混杂岩带系统的区域地质调查和详细的剖面研究发现,它是由不同时代和不同成因的地质体混杂而成。研究表明,混杂岩带可分为5个地质单元。它们之间互成断层接触。作为基质的温泉组形成于靠近大陆斜坡的的深水盆地环境,发生了区域低温动力变质作用与4期变形。原地岩块中的澜沧岩群经历过高压变质作用。原地岩块中的西盟岩群经历过区域中温变质作用。外来岩块中的的变玄武岩为泥盆纪的OIB型变玄武岩,共发生过一期变质和两期变形,第一期变质为同变形的变质,属于绿片岩相的区域低温动力变质作用,第二期变形主要是先存片理的褶皱,在强变形部位形成片理S2。外来岩体中的片麻状花岗闪长岩经历过区域低温动力变质作用。
[Abstract]:For a long time, the Changning-Menglian combined zone has been a hot spot for geological experts and scholars at home and abroad to study the tectonic evolution of the PaleoTethys ocean. Through many years of research work, new discoveries and new understandings have emerged in endlessly. The research in this area has been greatly improved. However, different scholars and experts have different understanding and understanding of the tectonic properties, scale and evolution history of the prototype sedimentary basin in Changning-Menglian belt. The Changning melange belt in western Yunnan belongs to the north extension part of the Changning-Menglian combination belt. The melange belt has a north-south-east strike, the east side is in contact with the Chongshan rock group, the Triassic granodiorite is in fault contact, and the west side is in contact with the west allied rock group. The magpie group was in fault contact. Based on the regional geological survey and detailed profile study of the Changning melange belt in western Yunnan, it is found that it is composed of geological bodies of different ages and different genesis. The study shows that the melange belt can be divided into five geological units. They are in contact with each other on a fault. The hot spring formation, as the matrix, was formed in the deep-water basin environment near the continental slope, and the regional low-temperature dynamic metamorphism and deformation occurred in the 4th stage. Lancang rock group in situ rock block has undergone high pressure metamorphism. The Ximeng rock group in the in-situ rock block has experienced regional metamorphism. The metamorphic basalt in the extraneous rock block is OIB type metamorphic rock of Devonian. The first metamorphism is the same deformation metamorphism, which belongs to the regional low-temperature dynamic metamorphism of greenschist facies. The second stage of deformation is mainly the fold of the tectonics, and the S2 is formed in the strong deformation position. The granodiorite in the extraneous rock mass has undergone regional low temperature dynamic metamorphism.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P588.36

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