Devonian continental arc magmatism in the southern Central Asian Orogenic Belt:Evidence from the Dunhuang Block,NW China  

作　　者：Baoping Gan Juxing Tang Inna Safonova Limao Qin Chunrong Diwu 

机构地区：[1]Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China [2]State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an 710069,China [3]MNR Key Laboratory of Metallogeny and Mineral Resource Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China [4]Sobolev Institute of Geology and Mineralogy SB RAS,Koptyuga ave.,3,Novosibirsk 630090,Russia

出　　处：《Geoscience Frontiers》2023年第6期155-169,共15页地学前缘（英文版）

基　　金：supported by the National Natural Science Foundation of China(41972200);Project funded by China Postdoctoral Science Foundation(2022M712629);Opening Foun-dation of State Key Laboratory of Continental Dynamics,Northwest University(21LCD13);Fundamental Research Funds for the Central Universities(2682022CX029,2682023CX016);Ministry of Science and Higher Education of Russia,State Assignment Project(122041400044-2)。

摘　　要：Reconstruction of periods and sources of continental arc magmatism provides critical insights for deciphering the thermal evolution and geodynamics of the continental lithosphere and unveiling subduction-related episodes of accretion and orogeny.The Dunhuang Block,located in the southern Central Asian Orogenic Belt,is built upon a Precambrian metamorphic crystalline basement that is intruded by numerous Paleozoic granitoids.In this paper,we present new zircon U-Pb ages,wholerock geochemistry and Sr-Nd-Pb-Hf isotopes from the Hanxiakouzi and Shuangta granodiorite plutons outcropped in the central and northern Dunhuang Block,respectively.The U-Pb zircon dating indicate that the Hanxiakouzi and Shuangta granodiorites were emplaced at ca.366–363 Ma,i.e.,in the late Devonian.Geochemically,the Hanxiakouzi granodiorites are medium-to high-K,I-type granites possessing high Sr and Sr/Y,i.e.,similar to adakites.The Hanxiakouzi granodiorites show negativeε_(Nd)(t)values(-8.2 to-6.6),significant positive eHf(t)values(+0.7 to+8.1),and evolved Pb isotope features suggesting their derivation by melting of subducted terrigenous sediments,interaction of melts with mantle peridotite,and assimilation of ancient crust during magma ascent.The Shuangta granodiorites belong to high-K calc-alkaline I-type granites with medium Sr and low Sr/Y.The Shuangta granodiorites yield negativeε_(Nd)(t)values(-2.9 to-3.1)and negative to positive zircon eHf(t)values(-1.8 to+3.6),suggesting their formation by partial melting of ancient mafic crust with addition of minor mantle-derived melt and subducted terrigenous sediments.In general,Hf-in-zircon isotopes characteristics of the late Paleozoic granitic rocks in the Dunhuang Block indicate that the southern Dunhuang area carries more ancient crust materials than the central and northern Dunhuang areas,indicating a lateral heterogeneity of the middle Paleozoic crust.Conclusively,the middle Paleozoic granitoids of the Dunhuang Block were emplaced at an active continental margin of the southern Pale

关 键 词：Devonian granitoids Hf-in-zircon isotopes Sr-Nd-Pb isotopes Subducted sediments Active continental margin 

分 类 号：P534.4[天文地球—古生物学与地层学] P597.3[天文地球—地质学] P542