元谋变质核杂岩及其控矿作用

YUANMOU METAMORPHIC CORE COMPLEX AND ITS ORE-CONTROLLING ROLE

元谋变质核杂岩构造系统由核部杂岩、拆离断层下盘韧性剪切带、拆离断层以及上盘拆离滑脱系四大部分构成。研究表明:核部杂岩控制了本区与基性 超基岩、花岗岩有关的Cu,Pt,Pb,W,Mo及稀土等矿床;韧性剪切带与后期浅表部的脆性断层控制了本区Au,Cu等矿产的产出;主折离断层、次级折离断层与后期浅表部的脆性断层构成一个集导矿、储矿为一体的构造系统,共同控制了折离滑脱系中Pb,Cu,铂铜镍、赤(磁)铁矿及部分非金属矿的产出。本文结合Lister的混合流体模式,简述元谋变质核杂岩的成矿机理,指出本区矿产勘查远景及方向。

The metamorphic core complex structural system in Yuanmou of Yunnan Province is formed by 4 parts,ie,the metamorphic core complex;the ductile shear zone under the detachment fault;the detachment fault and the detachment system above it.According to this study,the core complex controls the rare metal(Cu,Pt,Pd,W,Mo)and REE deposits related to the maficultramafic rock and granite in this area,the ductile shear zone and the postshearing surfacial brittle fault control the Au and Cu deposits;the major and minor detachment faults and the surfacial brittle fault form a transfer and storing structural system and control the PtCuNi maghemite and part of nonmetals deposits in the detachment system.In this paper,according to the Listers model of mixture fluid,we describe the metallogenesis of Yuanmou metamorphic core complex and point out the prospecting potentiality and direction in this area.