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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Late Neoproterozoic magmatism in South Qinling, Central China: Geochemistry, zircon U-Pb-Lu-Hf isotopes and tectonic implications
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Late Neoproterozoic magmatism in South Qinling, Central China: Geochemistry, zircon U-Pb-Lu-Hf isotopes and tectonic implications

机译：中国中部南秦岭新元古代晚期岩浆作用：地球化学，锆石U-Pb-Lu-Hf同位素及其构造意义

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摘要

The Neoproterozoic tectonic evolution of the northern margin of the Yangtze Block in South China remains debated. In this study, we present results from LA-ICP-MS zircon U-Pb geochronology on a suite of intermediate-felsic rocks in South Qinling, Central China which show a mean age of ca. 630 Ma. The zircon epsilon(Hf) (t) values of these rocks mostly range from +0.44 to +14.78. Geochemically, the granites and syenite show high total alkali contents, with enrichment in LREE, LILE (Rb, Ba, and K), and HFSE (Th, U, Nb, Ta, Zr, and Hf), and depletion in Sr, P, and Ti, similar to the features of A-type granites. The meta-diorite shows high Na2O, with depletion in Eu, Ti, and LILE (Sr, Rb, Ba, and K), and enrichment in HFSE (Th, U, Nb, Ta, Zr, and Hf). The geochemical features are consistent with formation of the intermediate-felsic suite through fractionation from underplated basaltic magma that originated from sub-continental lithospheric mantle metasomatized by asthenosphere-derived oceanic-island-basalt-like (OIB-like) melts, coupled with minor crustal contamination. We correlate the ca. 630 Ma magmatism with a back-arc rift setting that probably developed in relation to slab tearing during continued slab rollback. (C) 2016 Elsevier B.V. All rights reserved.
机译：中国南方扬子地块北缘的新元古代构造演化仍存在争议。在这项研究中，我们介绍了中国中南部南秦岭一套中长质岩石上的LA-ICP-MS锆石U-Pb年代学结果。 630毫安。这些岩石的锆ε（hf）（t）值大多在+0.44至+14.78之间。从地球化学上讲，花岗岩和正长岩中总碱含量很高，富含LREE，LILE（Rb，Ba和K）和HFSE（Th，U，Nb，Ta，Zr和Hf），并且Sr，P贫化和Ti，类似于A型花岗岩的特征。亚闪长岩显示出较高的Na2O，其中Eu，Ti和LILE（Sr，Rb，Ba和K）耗尽，而HFSE中（Th，U，Nb，Ta，Zr和Hf）富集。地球化学特征与通过从地下软岩石层地幔分馏而形成的中等长统组相一致，该玄武岩源于软流圈衍生的洋岛玄武岩样（OIB样）熔体交代后的次大陆岩石圈地幔，再加上次要地壳污染。我们将ca关联起来。 630 Ma岩浆作用具有弧后裂谷设置，这可能是由于板坯持续回滚期间板坯撕裂引起的。 （C）2016 Elsevier B.V.保留所有权利。

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