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

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Geoscience Frontiers 2023年第6期14卷 155-169页

作者： Baoping Gan Juxing Tang Inna Safonova Limao Qin Chunrong Diwu Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi’an 710069China MNR Key Laboratory of Metallogeny and Mineral Resource Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China Sobolev Institute of Geology and Mineralogy SB RAS Koptyuga ave.3Novosibirsk 630090Russia

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 *** Dunhuang Block,located in the southern Central Asian Orogenic Belt,is built upon a Precambrian metamorphic crystalline basement that is intruded by numerous Paleozoic *** 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,*** U-Pb zircon dating indicate that the Hanxiakouzi and Shuangta granodiorites were emplaced at ca.366–363 Ma,i.e.,in the late ***,the Hanxiakouzi granodiorites are medium-to high-K,I-type granites possessing high Sr and Sr/Y,i.e.,similar to *** 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 *** Shuangta granodiorites belong to high-K calc-alkaline I-type granites with medium Sr and low Sr/*** 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 *** 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 ***,the middle Paleozoic granitoids of the Dunhuang Block were emplaced at an ac

关键词： devonian granitoids Hf-in-zircon isotopes Sr-Nd-Pb isotopes Subducted sediments Active continental margin

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