U-Pb dating and geochemistry of granite porphyry dykes in the Xicha gold-(silver)deposit,southern Jilin Province,China,and their metallogenic significance

作     者：Jian Wang Fengyue Sun Bile Li Lihui Tian Jian Wang;Fengyue Sun;Bile Li;Lihui Tian

作者机构：School of Mining Engineering.Heilongjiang University of Science and TechnologyNo.2468 Puyuan StreetHarbin 150022People's Republic of China College of Earth SciencesJilin UniversityChangchun 130061People's Republic of China 

出 版 物：《Acta Geochimica》 (地球化学学报（英文）)

年 卷 期：2020年第39卷第4期

页      面：574-586页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the Undergraduate Institutions Basic Scientific Research Foundation of Heilongjiang Province(Hkdcx201805) the Natural Science Foundation of Heilongjiang Province,China(QC2017035) the National Nature Science of Foundation of China(41272093) 

主　　题：Southern Jilin Province Syn-mineralization dykes Jinchanggou Zircon U-Pb geochronology Geochemistry Hf isotopes 

摘      要：We report U-Pb dating of zircon,as well as geochemical and Hf isotope data,in order to constrain the formation time,magma source,and tectonic setting of granite porphyry dykes in the Xicha gold-(silver)district in southern Jilin Province,Northeast *** zircon grains are euhedral-subhedral,display oscillatory growth zoning and have Th/U ratios varying between 0.11 and 0.78,which together imply a magmatic *** dating results indicate the porphyry formed in the Early Cretaceous(122±1 Ma)and it contains SiO2=70.64-72.31 wt%,Al2O3-=13.99-14.64 wt%,K2O+Na2O=6.96-7.81 wt%K2O/Na2O=1.24-2.10,and A/CNK=***,the porphyry belongs to a high-K calc-alkaline S-type ***-normalized rare earth elements(REE)patterns show LREE enrichment,light rare earth elements(LREE)/heavy rare earth elements(HREE)=9.93-11.97(La/Yb)N=11.08-15.16,and d Eu=*** the trace element spider diagram,large ion lithophile elements such as Rb,Ba,K,Th,and U are enriched,whereas the high field strength elements Ti and P are *** e Hf(t)values of zircon from the granite porphyry vary between-17.1 and-13.2,and their Hf two-stage model ages vary from 2.01 to 2.26 Ga,implying that the magma was derived from partial melting of old lower *** granite porphyry dykes and many A-type granites in the region formed at the same time,suggesting an extensiona *** combination of the occurrence of strong magmatism,large-scale mineralization,and extensiona tectonics throughout much of Eastern China indicate that the Early Cretaceous was a period of significant lithospheric *** southern Jilin Province,therefore,experienced lithospheric thinning during the Early Cretaceous.