Petrogenesis and Dating of Two Types of Granite from North Qilian, China  

作　　者：WUCailai SHIRendeng YANGJingsui YANGHongyi JosephL.WOODEN ZHENGQiuguang CHENGShengyong 

机构地区：[1]ContinentalDynamicsLaboratory,InstituteofGeology,ChineseAcademyofGeologicalSciences,Beijing100037,China [2]ChungkungUniversity,Tainan,Taiwan,China [3]StanfordUniversity,USA

出　　处：《Acta Geologica Sinica(English Edition)》2005年第2期193-200,共8页地质学报（英文版）

基　　金：the NationalNatural Science Foundation of China(Nos.40472034 ,49732070);Chinese National Key Project for Basic Research(2003CB716500);National 973 Project(G1988040800); China Geological Survey Project(200313000058).

摘　　要：Two types of granitic intrusives occur in the lower Paleozoic strata in north Qilian. One is the hornblende- bearing granitic body in Jingzichuan, characterized by the REE total of 90×10-6-106×10-6, LREE/HREE ratio of less than 8 (ranging from 6.9 to 7.8) and zircon SHRIMP age of 464 Ma. These intrusives have island-arc affinity. The other is biotite-bearing granitic body in Huangyanghe with the REE total of 214×10-6-250×10-6, LREE/HREE ratio of more than 8 (ranging from 8.2 to 9.7) and zircon LA-ICP-MS age of 383 Ma. They were tectonically intruded in a post-collisional or within-plate environment.Two types of granitic intrusives occur in the lower Paleozoic strata in north Qilian. One is the hornblende- bearing granitic body in Jingzichuan, characterized by the REE total of 90×10-6-106×10-6, LREE/HREE ratio of less than 8 (ranging from 6.9 to 7.8) and zircon SHRIMP age of 464 Ma. These intrusives have island-arc affinity. The other is biotite-bearing granitic body in Huangyanghe with the REE total of 214×10-6-250×10-6, LREE/HREE ratio of more than 8 (ranging from 8.2 to 9.7) and zircon LA-ICP-MS age of 383 Ma. They were tectonically intruded in a post-collisional or within-plate environment.

关 键 词：north Qilian GRANITE zircon dating 

分 类 号：P588.115[天文地球—岩石学] P534.4[天文地球—地质学]