滇西高黎贡山变质带变质深成岩特征及时代  

Characteristics and Geological Times of Metamorphic Plutonic Rocks in the Metamorphic Zone of Gaoligong Mountains in Western Yunnan

作　　者：谭筱虹 尹光侯 张震[3,4] 李锡康 赵波 

机构地区：[1]云南省地质调查院,昆明650051 [2]云南省地质调查局,昆明650051 [3]中国地质科学院矿产资源研究所,北京100037 [4]国土资源部盐湖资源与环境重点实验室,北京100037

出　　处：《地质论评》2013年第4期687-701,共15页Geological Review

基　　金：1:5万曲石街;打苴街;大董街幅区域地质调查(编号200113000067);国家重点基础研究发展计划(编号2009CB421007)的成果

摘　　要：高黎贡山变质岩带中(腾冲大蒿坪地区),原划归古元古代高黎贡山岩群中广泛存在的变质深成岩类,原岩实际为早白垩世(163.5±5.7Ma)花岗闪长岩和晚白垩世(74.0±2.0Ma)二长花岗岩类,属变质的燕山期深成侵入岩,可划分为扬飞水角闪黑云花岗闪长质片麻岩、芹菜塘花岗片麻岩两个变质地体单元。早白垩世花岗闪长岩形成于造山前期同碰撞火山弧环境;晚白垩世二长花岗岩侵入岩形成于造山前期碰撞造山环境,并沿断裂带强烈侵位。原岩经喜马拉雅早期韧性剪切带动力变质,变质强度达高绿片岩相或低角闪岩相,形成花岗质片麻岩类,喜马拉雅中期叠加脆韧性动力变质作用。The widely developed metamorphic plutonic rocks in the metamorphic zone of the Gaoligong Mountains were allocated to Gaoligongshan Group of Paleoproterozoic previously,however,the original rocks of which were granodiorite of Early Crataceous（163.5±5.7 Ma） and adamellite of Late Crataceous（74.0±2.0Ma） .They belong to metamorphic plutonic intrusion rocks of Yanshanian age,which could be divided into two metamorphic terrane units,being named the Yangfeishui hornblende-biotite granodiorite gneiss and the Qincaitang granite gneiss.The granodiorite rocks of Early Crataceous were formed in the environment of syn-collision volcanic arc of pre-orogenic phase,while the adamellite intrusion rocks of Late Crataceous were formed in the environment of collisional orogeny of pre-orogenic phase,with intense emplacement along the fault belt.The original rocks were undergone the dynamic metamorphism of ductile shear belt of early Himalayan period with the metamorphic intensity of high greenschist facies or low amphibolite facies,which attributed to the formation of granitic gneiss and the superimposed brittle-ductile dynamic metamorphism of the middle Himalayan period.

关 键 词：变质带 杨飞水片麻岩 芹菜塘片麻岩 锆石U-PB年龄 高黎贡山 

分 类 号：P588.3[天文地球—岩石学]