四川米易垭口地区前震旦纪五马箐组岩石学特征  

Petrological characteristics of pre-sinian Wumaqing formation in Miyi area,Sichuan Province

作　　者：詹国鑫 陈友良[1,2] 殷桂芹 张宝玲 顾孟娟 范伟 ZHAN Guoxin;CHEN Youliang;YIN Guiqin;ZHANG Baoling;GU Mengjuan;FAN Wei(College of Earth Sciences,Chengdu University of Technology,chengdu 610059,Sichaun,China;Key Laboratory ofApplied Nuclear Techniques in Geosciences of Sichuan Province,chengdu 610059,Sichaun,China)

机构地区：[1]成都理工大学地球科学学院,四川成都610059 [2]成都理工大学地学与核技术四川省重点实验室,四川成都610059

出　　处：《四川冶金》2022年第5期22-25,共4页Sichuan Metallurgy

基　　金：国家自然科学基金项目(42072096);中国核工业地质局重点科研项目(202137-3);成都理工大学珠峰科技计划(2021ZF11413)。

摘　　要：本文以四川米易垭口地区五马箐组地层为研究对象,通过详细的野外地质调查、剖面实测以及室内岩矿鉴定,对五马箐组的岩石组合与岩相学特征进行了系统地研究,结果表明:米易垭口地区的五马箐组为一套海相沉积的陆缘碎屑岩建造,其岩性组合为一套以云母石英片岩、云母片岩、片状石英岩夹变质泥岩、变质粉砂岩等组成的变沉积岩系,其地层层序相当于会理群下部的力马河组。野外观察和镜下岩矿鉴定结果均表明五马箐组变沉积岩成分成熟度、结构成熟度均较低,指示其为近源沉积产物。This paper takes the Stratum of the Wumaqing Formation in Yakou area of Sichuan Province as the research object,and systematically studied the rock assemblage and petrographic characteristics of the Wumaqing Formation through detailed field geological survey,section measurement and indoor rock and ore identification.The results indicate that the Wumaqing Formation in Yakou area is a Marine sedimentary continental margin clastic rock formation,and its lithological association is a variable sedimentary rock series consisting of mica quartz schist,mica schist,flake quartzite mixed with metamorphic mudstone and metamorphic siltstone,and its stratigraphic sequence is equivalent to Limahe Formation in the lower part of Huili Group.The results of field observation and microscopic identification indicate that the maturity of composition and structure of the metamorphotic sedimentary rocks in the Wumaqing Formation is low,indicating that they are proximal sedimentary products.

关 键 词：垭口地区 五马箐组 岩石组合 岩相学特征 

分 类 号：P583[天文地球—岩石学]