老挝沙耶武里地区纳克汗(B.Nakhan)剪切带岩石有限应变特征及其与金成矿关系探讨

The relationship between the finite strain characteristics of B.Nakhan shear zone and the distribution of gold mineralization in xayaburi, Laos

本文通过对老挝沙耶武里地区纳克汗(B.Nakhan)剪切带进行岩石学、构造样式、动力学及运动学分析,认为该剪切带应变型式以K<1的挤压型应变为主,表明其形成于挤压环境。带内构造岩的矿物组合以绿片岩相为主,变形温度为250℃~300℃,为一条具多期活动的低温绿片岩相具右旋逆冲型韧性剪切带。同时,在区域上纳克汗(B.Nakhan)剪切带与已发现的金矿带分布位置关系密切,空间上属于韧脆性区—脆性区域,这为下一步研究沙耶武里地区韧性剪切带与金矿的关系研究提供了一个新的重点方向。

Based on the analysis of rock,structural style,kinetics and kinematics of the B.Nakhan shear zone in the pakhan region in xayaburi,Laos.this paper considers that the strain type of the shear band is mainly based on the extruded strain of K<1,indicating that it is formed in the extrusion environment.Belt tectonic rock mineral composition is given priority to with green schist facies,deformation temperature is250℃~300℃,the mutiperiodic activity into a low-temperature greenschist facies type right-lateral thrust ductile shear zone.At the same time,in the area and the zone of gold distribution location,belongs to the ductile brittle zone-fragile area,this for the next step research of sand in the regional ductile shear zone and gold relationship provides a new important direction.