新疆乌恰县恰克马克地区长城系阿克苏岩群变质岩特征

摘要

Changcheng System Akesu rocks along Qiakemake Wuqia county in Xinjiang province are a suit of low-medium temperature and low-medium pressure metamorphic rocks,whose typical rocks mainly are biotite-quartzschist,twomica-quartzschist,epidote-biotiteschist,felsic-granulite,zoisite-biotiteschist,garnet-twomicaschist,quartzite,plagioclase-quartzleptite,chlorite-garnet-hornblende-twomica-quartzschist,sillimanite-twomica-quartzschist,andalusite-twomica-quartzschist and so on.Metamorphic zones were divided to biotite zone,almandine garnet zone and andalusite-sillimanite zone,and metamorphic facies were high green-chist and low amphibolite.The protolith of the metamorphic rocks are mudstone,pelitic siltstone,calcareous siltstone,quartz siltstone,felsic-quartz siltstone.The protolith occured as mixed deposits of terrigenous clastic and carbonate,which contained foreign material caused by volcanic eruption and rock intrusion comed from beyond provenance.And the metamorphism is regional low-temprature dynamothermal.%新疆乌恰县恰克马克地区长城系阿克苏岩群岩性主要为黑云石英片岩、二云石英片岩、绿帘石黑云母片岩、长英质变粒岩、黝帘石黑云母片岩、石榴石二云片岩、石英岩、斜长石英浅粒岩、绿泥石石榴石角闪石二云石英片岩、矽线石二云石英片岩、红柱石二云石英片岩等,为一套低-中温、低-中压变质岩系列区域动热岩,其变质带分为黑云母带、铁铝石榴石带、红柱石-矽线石带,属高绿片岩相和低角闪石相.变质岩原岩为泥岩、泥质粉砂岩、钙质砂岩、石英砂岩及少量火山碎屑岩等,属陆源碎屑岩夹碳酸盐岩沉积建造环境,变质作用属区域低温动热变质作用.