Mineral Chemistry,Trace Elements,Isotopic Analysis and Zircon U-Pb Dating in the Hesar Pluton,Northern UDMA,Iran:Implications for Pre-Collisional Magma Mixing

扫码查看

原文链接

国家科技期刊平台
NETL
NSTL
万方数据

外文摘要：The Hesar pluton in the northern Urumieh-Dokhtar magmatic arc hosts numerous mafic-microgranular enclaves(MMEs).Whole rock geochemistry,mineral chemistry,zircon U-Pb and Sr-Nd isotopes were measured.It is suggested that the rocks are metaluminous(A/CNK=1.32-1.45),subduction-related I-type calc-alkaline gabbro to diorite with similar mineral assemblages and geochemical signatures.The host rocks yielded an U-Pb crystallization age of 37.3±0.4 Ma for gabbro-diorite.MMEs have relatively low SiO2 contents(52.9-56.6 wt％)and high Mg#(49.8-58.7),probably reflecting a mantle-derived origin.Chondrite-and mantle-normalized trace element patterns are characterized by LREE and LILE enrichment,HREE and HFSE depletion with slight negative Eu anomalies(Eu/Eu*=0.86-1.03).The host rocks yield(87Sr/86Sr)i ratios of 0.70492-0.70510,positive εNd(t)values of+1.55-+2.06 and TDM2 of 707-736 Ma,which is consistent with the associated mafic microgranular enclaves((87Sr/86Sr)i=0.705014,εNd(t)=+1.75,TDM2=729 Ma).All data suggest magma-mixing for enclave and host rock formation,showing a complete equilibration between mixed-mafic and felsic magmas,followed by rapid diffusion.The TDM1(Nd)and TDM2(Nd)model ages and U-Pb dating indicate that the host pluton was produced by partial melting of the lower continental crust and subsequent mixing with injected lithospheric mantle-derived magmas in a pre-collisional setting of Arabian-Eurasian plates.Clinopyroxene composition indicates a crystallization temperature of～1000℃ and a depth of～9 km.

外文关键词：

enclavemagma mixingzircon U-Pb datingUrumieh-Dokhtar magmatic arc

作者：

Kazem KAZEMI、Soroush MODABBERI、Parisa GHARIBNEJAD、XIAO Yilin、Fatemeh SARJOUGHIAN、Ali KANANIAN

展开 >

作者单位：

School of Geology,College of Science,University of Tehran,Tehran,Iran

Research Centre for Mineral Resources,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China

National Key Laboratory of Ecological Security and Resource Utilization in Arid Areas,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China

Department of Geochemistry and Environmental Sciences,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China

Department of Earth and Sciences,Faculty of Sciences,University of Kurdistan,Sanandaj,Iran

Department of Science Education,Farhangian University,Tehran,Iran

展开 >

基金：

Iran National Science Foundation(INSF)国家自然科学基金国家自然科学基金

项目编号：

980125784147303341673031

出版年：

2024

DOI：

10.1111/1755-6724.15118

地质学报(英文版)