摘要
戈枕脆、韧性叠加剪切带为一条呈北东向横贯海南岛土外山金矿区的窄长线性强应变带,具有显著的塑性流变、剪切应变及递进演化的特点。带内岩石表现出强烈的韧性变形和糜棱岩化及叠加的碎袭岩化,以及绿片岩相退化变质作用,形成一套由不同时代不同类型岩石的糜棱岩、碎袭岩所组成,呈似透镜状平行产出的剪切带。其中较显著的是产生一套类似混合岩外貌的长英质糜棱岩系列岩石。戈枕脆、韧性叠加剪切带的发现和确定对研究土外山金矿床的成因以及进一步找矿具有十分重要的意义。
The Gezhen brittle-ductile supperimposition shear zone is a narrow, long and highly-strained zone, extending in a north-east direction through the Tuwaishan gold deposit area in Hainan Island. It has the following characteristics: obvious plastic flow, shear strain and progressive evolution. The rocks in the zone underwent intense ductile deformation, mylonitization, superimposed cataclastization and retrograde metamorphism in greenschist facies. Subsequently, a set of mylonite series with different time and lithological characters formed and shaped like lensoid. Among them the most prominent is a set of quartz-feldspathic mylonite series similar to migmatite. The discovery and identification of the shear zone is of important significance for the study of the Tuwaishan ore genesis and for prospecting.
出处
《大地构造与成矿学》
EI
CAS
CSCD
1990年第3期255-265,共11页
Geotectonica et Metallogenia
关键词
金矿
成矿
戈枕脆
叠加
剪切带
shear strain, quartz-feldspathic mylonite, Gezhen brittle-ductile superimposition shear zone, Tuwaishan gold-deposit area,Hainan Island.
