Magma source and tectonic setting of the Dunde granite in the Western Tianshan:constraints from geochronology,geochemistry,and Sr–Nd–Hf isotopes

作     者：Zhaode Xia Haibo Ding Yanjiao Ru Zhaode Xia;Haibo Ding;Yanjiao Ru

作者机构：School of Earth Science and ResourcesChang’an UniversityXi’an 710054ShaanxiChina The Third Geological BranchXinjiang Geological and Mineral BureauKuerleXinjiang 841000China Geophysical and Geochemical Exploration CorporationBureau of Geological Exploration for Nonferrous Metals in Northwest ChinaXi’an 710068ShaanxiChina 

出 版 物：《Acta Geochimica》 (地球化学学报（英文）)

年 卷 期：2023年第42卷第5期

页      面：879-894页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：supported by Special Fund for Basic Scientific Research of Central Colleges,Chang’an University(Grant No.:300102279210) the Natural Science Foundation of Shaanxi Province(Grant No.:2019JQ-690) the geological and mineral survey evaluation project of China Geological Survey(Grant No.:DD20190065) 

主　　题：Granite Geochemistry Magma source Tectonic setting Dunde deposit Western Tianshan 

摘      要：The Dunde iron-zinc polymetallic deposit is one of large iron deposits occurred in the Awulale Metallogenetic Belt,Western Tianshan(NW-China).This study reports new geochronology and geochemistry for granite in the Dunde mining area in order to constrain the tectonicmagmatic activities and metallogenesis of this *** in the southwest of Dunde mining area are mainly syenogranites intruded into volcanics of the Dahalajunshan Formation in the Early Carboniferous,and they are far from the area where ore bodies and mineralized altered rocks are widely ***-ICP-MS U–Pb zircon dating indicates that Dunde syenogranite was at 306.8±1.0 Ma,which could constrain the upper limit of metallogenic age for this *** Dunde granites are high SiO_(2)(73.41–80.07 wt%),high differentiation index(D.I.=89.7–95.0),weakly peraluminous to metaluminous(A/CNK=0.94–1.08),and they are enriched in LILE and LREE and depleted in Eu,Ba,Sr and P_(2)O_(5),indicating that they belong to highly fractionated Ⅰ-type *** on εHf values(+9.2 to+10.5)for zircon and high εNd(-t)values(+4.7 to+5.8)for whole-rock,and the two-stage model ages for 601–735 Ma,suggest that the magma source could be the juvenile lower *** with regional geological setting,the 306.8 Ma Dunde granites are formed in post-collision extensional tectonic setting.