甘肃北山马鬃山地区志留纪侵入岩的厘定及其构造意义  

DETERMINATION OF SILURIAN INTRUSIVE ROCKS IN MAZONGSHAN AREA, BEISHAN, GANSU AND ITS TECTONIC SIGNIFICANCE

作　　者：王红杰[1,2] 郭峰 赵海波 刘佳[1,2] 王伟红 WANG Hong-jie;GUO Feng;ZHAO Hai-bo;LIU Jia;WANG Wei-hong(Zhengzhou Institutes of Multipurpose Utilization of Mineral Resouse,China Academy of Geological Sciences,Key Laboratory for Ploy-metallic Ores'Evaluation and Utilization of Ministry of Natural Resources,Zhengzhou 450006,China;Northwest China Center for Geoscience Innovation,Xian 710054,China)

机构地区：[1]中国地质科学院郑州矿产综合利用研究所,自然资源部多金属矿评价与综合利用重点实验室,河南郑州450006 [2]西北地质科技创新中心,陕西西安710054

出　　处：《甘肃地质》2020年第3期13-21,共9页Gansu Geology

基　　金：东天山昌吉—双沟山地区区域地质调查(中国地质科学院郑州矿产综合利用研究所)(编号:DD20190067)。

摘　　要：本文在甘肃北山马鬃山夏尔陶勒地区,从1∶25万马鬃山幅划分的敦煌岩群地层中厘定出一套浅变质侵入体,岩性以片麻状花岗闪长岩、片麻状二长花岗岩和片麻状正长花岗岩为主。对其中的片麻状花岗闪长岩研究,其具有高SiO2(70.16%~73.12%)、富Al2O3(15.56%~17.86%)、富K2O(4.32%~5.32%)特征,A/CNK大于1.05,富集Rb、Th,亏损Nb、P、Ti,表现为S型花岗岩特征。锆石U-Pb测年结果表明其形成于(443.1±9.2)Ma,为早志留世,它的形成与北山造山带早古生代造山运动有关,北山造山带在早志留世处在同碰撞阶段。In this article, we researched in the Mazongshan Xiaertaole area of Beishan, Gansu, a set of shallow metamorphic intrusive bodies was identified from the dunhuang rock group division of the original1 ∶ 250,000 Mazongshan. The lithology is gneissic granodiorite and gneissic monzonitic granite and gneissic syenite. The study of the gneissic granodiorite shows that it has the characteristics of high SiO2(70. 16% ~73. 12%), rich Al2O3(15. 56% ~ 17. 86%), rich K2O(4. 32% ~ 5. 32%), and A/CNK is biger than 1. 05,enriched in Rb and Th, loss of Nb, P, and Ti, showing the characteristics of S-type granite. Zircon U-Pb dating results show that it was formed in(443. 1 ± 9. 2) Ma, in the Early Silurian, and its formation is related to the early Paleozoic orogeny of the Beishan orogenic belt, which was in the syn-collisional stage in the Early Silurian.

关 键 词：北山 马鬃山 敦煌岩群 片麻状花岗闪长岩 S型花岗岩 厘定 同碰撞 

分 类 号：P588.3[天文地球—岩石学]