甘肃省皋兰县什川岩体的地质学特征  

GEOLOGICAL CHARACTERISTICS OF SHICHUAN ROCK MASS IN GAOLAN COUNTY OF GANSU PROVINCE

作　　者：梁志录 刘宏伦 王云斌[3] 康胜松[4] 付国民[4] 

机构地区：[1]甘肃省地矿局第三地勘院,甘肃兰州73000 [2]云南地矿资源股份有限公司,云南昆明671000 [3]西北有色地质研究院,陕西西安710054 [4]长安大学,陕西西安710054

出　　处：《甘肃地质》2007年第4期31-36,共6页Gansu Geology

基　　金：中国地质调查局地质调查项目(项目编号J6.2.7);兰州市幅1:25万区域地质调查项目(J48C004002)

摘　　要：什川岩体出露于甘肃省皋兰县什川镇一带,侵位于中元古代的变质地层——皋兰岩群中,岩体从早到晚依次由中细粒黑云母斜长花岗岩侵入体、中细粒黑云花岗闪长岩侵入体、中细粒二长花岗岩侵入体、中粗粒二长花岗岩侵入体和细粒二长花岗岩侵入体组成。各侵入体之间的接触关系有脉动和涌动两种,为同源岩浆演化的产物,且侵入体中包体发育,岩性较复杂,形态各异,并普遍有原生流动构造、流动变形构造、叠加变形构造等样式,产状多变。岩浆以被动就位的岩墙扩张模式为主,兼具强力就位的特点,就位时代为志留纪晚期。Shichuan rock mass outcrop at Shichuan township of Gaolan County in Gansu Province intruded into Gaolan Rock Group of middle Proterozoic metamorphic strata. The rock mass are divided respectively to mid-fine granular biotite plagiogranite unit, mid-fine granular biotite granodiorite, mid-fine granular adamellite, mid-coarse adamellite and fine granular adamellite, between which relationships of pulsating and upwelling occurred , and they are formed from comagmatic evolution. The intrusive bodies, among which inclusions are developed, broadly have primary flow structure, flow and superimposed deformation structure with the various occurrences. The magma are forced intensively into emplacement mainlv by the pattern of dike expansion at Late Silurian.

关 键 词：皋兰县什川 侵入体 构造特征 

分 类 号：P588.12[天文地球—岩石学]