走滑断裂带的两类花岗岩  

TWO KINDS OF GRANITES OF STRIKE-SLIP FAULTED ZONE

作　　者：彭玉鲸[1] 王明胜[2] 

机构地区：[1]吉林地勘局区域地质矿产调查所 [2]吉林省地质科技情报研究所

出　　处：《吉林地质》1998年第2期20-30,共11页Jilin Geology

摘　　要：大型走滑断裂带，由于在水平方向的运动，导致两个区域发生扩张；另两个区域发生压缩。前者控制了拉分火山沉积盆地，形成了与火山作用同源的走滑—拉分张裂型侵入岩；后者控制了菱形地垒，形成了走滑—挤压隆起型花岗岩。这两类花岗岩同时产于同一走滑断裂带的不同部位，因其构造环境不相一致，在宏观上以被动就位和强力就位而有明显区分；在微观上以岩石化学等物质组分或趋近典型的张裂性花岗岩套，或趋近典型的挤压性花岗岩套，而泾渭分明。首次发现的这两类花岗岩并存的实例，为产于辽吉黑东部鸭绿江断裂带中的东宁老黑山—珲春农坪的走滑—拉分张裂型花岗岩套和浑江荒沟山走滑—挤压隆起型花岗岩套。它们形成的时代均属晚三叠世。s the horizontal movement of the large strike-slip faulted zone,it leads to extension from two regions and compression from the other two one.The pull-apart volcanic-sedimentary basin was controlled by the former,forming strike-slip and pull-apart tensional intrusive rocks with congenetic volcanic actions;a lozenge-shaped horst was contrlled by the later,forming lifted granites with strike-slip and compression type.The two kinds of granites occurred simultaneously in different parts of the same strike-slip faulted zone.Macroscopically,the passive and forced emplacment have obvously difference as the different settings;and microcosmicly,the petrochemical compositions may be similar to typical tensional granite suite or typical compressive granite suite which they are entirely different.A case of two kinds of coexisted granites were discovered for the first time,they occurred in the Dongning(Laoheishan)-Nongping(Hunchun)strike-slip and pull-part tensional granite suite in the Yalujiang faulted zone in the eastern part of Liaoning,Jilin and Heilongjiang provinces and in the Huanggoushan strike-slip granit suite and compressive upwelling granit suite in Hunjiang,their forming age belongs to the late Triassic.

关 键 词：走滑断裂 花岗岩 岩石形态 类型 

分 类 号：P588.121[天文地球—岩石学]