Mantle plume:the dynamic setting of the origin of Early Paleozoic mafic dykes in Ziyang,Shaanxi Province,Southern Qinling Block,China

作     者：Xiaoqing Chen Shen Liu Caixia Feng Ian M.Coulson Yan Fan Kairui Tai Tianjing Gao Siyuan Zhang Xiaoqing Chen;Shen Liu;Caixia Feng;Ian M.Coulson;Yan Fan;Kairui Tai;Tianjing Gao;Siyuan Zhang

作者机构：College of Earth ScienceJilin UniversityChangchun 130061China State Key Laboratory of Continental Dynamics and Department of GeologyNorthwest UniversityXi'an 710069China Solid Earth Studies LaboratoryDepartment of GeologyUniversity of ReginaReginaSK S4S 0A2Canada 

出 版 物：《Acta Geochimica》 (地球化学学报（英文）)

年 卷 期：2020年第39卷第3期

页      面：307-325页

核心收录：

学科分类：070902[理学-地球化学] 070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：This study was supported by the National Natural Science Foundation of China(Grant:41573022) 

主　　题：Early Paleozoic Dolerites Geochemistry Origin Mantle plume 

摘      要：The mafic dykes(dolerites)during the Early Paleozoic are widely spread in Langao-Ziyang,southern Qiling Block,and the investigation on these dykes are very *** studies have mainly focused on the Silurian mafic dykes;however,research on the Earlier Paleozoic mafic dykes is relatively weak at ***,the overall understanding of the mantle source and genetic dynamic setting during the Early Paleozoic in this area is *** study the accurate age and origin of the Early Paleozoic mafic dykes in Ziyang,southern Shaanxi Province,the mafic dykes from dabacunand Qinmingzhai were selected and the petrology,zircon U-Pb chronology,geochemistry,and Sr-Nd-Hf isotopes were *** indicates that the mafic dykes studied are mainly composed of dolerite,and they are the products of the Early Ordovician(475.8-480.7 Ma).Furthermore,the dolerites belong to alkaline rock series,and they are characterized by enrichment in LREE,Rb,Ba,Sr,Nb,(87Sr/86Sr)i=0.7020-0.7050,εNd(t)=3.0-4.0),εHf(t)=4.5-12.1,176Hf/177Hf=*** suggests that the mafic dyke were derived from the partial melting of a depleted lithospheric mantle,and the genetic process is mainly controlled by the mantle plume based on the discussion of the genetic ***,the genetic process experienced the separation and crystallization of olivine and clinopyroxene at the same time,with little crustal contamination.