四川石棉草科穹状岩浆核杂岩构造特征  

DOMAL STRUCURE OF MAGMATIC CORE COMPLEX IN CAOKE, SHIMIAN, SICHUAN

作　　者：郭建强[1] 喻安光[1] 游再平[1] 杨军[1] 

机构地区：[1]四川地勘局区调队

出　　处：《矿物岩石》1998年第4期90-97,共8页Mineralogy and Petrology

摘　　要：位于扬子陆块西缘的石棉草科穹状变形变质体，据近年来的研究表明，该穹隆体经历了三次变形变质时期：早期为收缩滑脱变形的区域动力变质、中期热隆伸展动热变质和后期岩浆热接触变质。对主期变质划分出黑云母带、石榴石带、红柱石－十字石带和矽线石带，确定为低压相系，利用变质反应、矿物地质温压计及相关的同位素年龄资料，建立了草科穹状变形变质体演化的ｐ－Ｔ－ｔ－Ｄ轨迹。轨迹图呈顺时针形式，具碰撞造山带环境的特点，变形变质过程受变质体前缘西油房韧性剪切带逆冲－推覆作用和后缘碰撞晚期岩浆大规模上侵的双重制约，为深源岩浆热动力变质成因，属穹状岩浆核杂岩构造。Domal metamorphic body occurs in Caoke,Shimian in the western margin of the Yangtze platform.Recent study shows that the body experienced three stages of metamorphism. The first is compressive datachmemt regional dynamical metamorphism, the middle is thermal dome extensional dynamothermal metamorphism,and the later is magmatic thermal contact metamorphism.The middle is divided into biotite zone,garnet zone,andalusite staurolite zone,andsillimanite zone,and defined low pressure facies.Clockwise p T t D path forthe metamorphic body is constructed by use of metamorphic reactions,geothermobardmeter and related isotopic dating data.Being restricted by thrusting and napping of Xi Yiufang ductile shear zone and massive magmatic invading.The body is subjected to structure of magmatic core complex,and formed by deep magmatic dynamothermal metamorphism.

关 键 词：穹状岩浆核杂岩 构造 石棉草科 变质岩 

分 类 号：P588.3[天文地球—岩石学]