摘要
变形岩石的磁组构参数(K1,K2,K3,P,T,F,L,E等)可以用来定量地分析和了解构造变形的性状。内蒙古兵图—大泉子一带韧性剪切带发育,并伴有金矿的产出。文章通过定向采取韧性剪切带内的岩石样品,测定岩石磁组构特征,认为该断裂面两侧形成一对顺时针方向力偶,促使兵图—大泉子一带的韧性剪切带呈右行走滑运动。韧性剪切带由于剪切生热和上地幔物质的上涌,在中下地壳发生高温高压变质作用,将热烘烤作用中形成的富含CO2等偏碱性流体带入中上地壳,在剪切带的脆性构造中因温压下降和沸腾作用,使金矿物与多金属硫化物沿糜棱面理及显微裂隙分布,形成韧性剪切带型金矿。
Magnetic fabric parameters（K1,K2,K3,P,T,F,L,E） of deformed rocks can be used to quantitatively analyze and understand characters of structural deformation.At Bingtu-Daquanzi area ductile shear zone is developed and acompanued by gold deposit.Meassurement of the directively collected samples in the ductile shear zone shows certain magenatic fabric characters.Based on the characters we believe that a pair of clockwise couple was formed on the both sides of the discontinuous plane to make Bingtu-Daquanzi ductile shear zone strike-slip in right dirction.The shear heating and upwelling of upper mantle materials lead to high temperature and pressure metamorphism at middle-lower crust in the extent of the ductile shear zone and sub-alkalic CO2-rich fluid resulted from heat drying effect were brought to the mid-upper crust where Au minerals and polymetallic sulfides precipitate along foliations and micro-fractures of myllonite in brittle zone due to release of pressure and boiling to form ductile shear zone type gold deposit.
出处
《地质找矿论丛》
CAS
CSCD
2012年第1期49-54,共6页
Contributions to Geology and Mineral Resources Research
基金
内蒙古自治区地质勘查局项目(编号:[2005]矿调1-8)资助
关键词
兵图—大泉子金矿
磁组构
韧性剪切带
找矿方向
内蒙古
Bingtu-Daquanzi gold deposit
magnetic fabric
ductile shear zone
ore-searching direction
Inner Mongolia
