Geochemical and Sr–Nd–Hf isotopic constraints on the origin of Late Triassic granitoids from the Qinling orogen, central China: Implications for a continental arc to continent–continent collision
作者： Yao-Hui Jiang , Guo-Dong Jin , Shi-Yong Liao , Qing Zhou , Peng Zhao
DOI: 10.1016/J.LITHOS.2010.02.014
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摘要: Abstract The Qinling–Dabie–Sulu orogen marks the junction between North and South China Blocks. However, exact timing of final coalescence Blocks in Qinling is poorly constrained. This paper presents new SHRIMP zircon U–Pb chronology, major trace elements, Sr–Nd–Hf isotope data for five early Mesozoic granitic plutons across orogen. dating shows that four were emplaced Carnian (227–218 Ma) Late Triassic with a southward-younging trend one pluton was Norian (∼ 211 Ma) Triassic. consist high-K calc-alkaline granitoids (quartz monzodiorite, quartz monzonite, granodiorite monzogranite) diorite. These rocks are mainly metaluminous characterized by high Sr low Y Yb contents, Sr/Y La/Yb ratios, Mg#, higher than pure crustal melts. composed two-mica granites, which peraluminous. granites have contents show similar Mg# to Detailed elemental isotopic suggest continental arc setting coupled northward subduction Paleo-Tethyan oceanic crust. Partial melting subducted sediments triggered dehydration underlying igneous crust, subsequent melts interacting overlying mantle wedge, formed magmas. hybridized peridotitic wedge induced slab generated dioritic magma. during collision terrane Block, integration at shallow depth (
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