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首页> 外文期刊>Journal of Asian earth sciences >Tectonic evolution of a complex orogenic system: Evidence from the northern Qinling belt, Central China
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Tectonic evolution of a complex orogenic system: Evidence from the northern Qinling belt, Central China

机译：复杂的造山系统的构造演化：来自中国中部北部秦岭带的证据

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The Qinling orogenic belt preserves the records of a long evolution history of convergence between the North China Craton and the South China Craton. In this study, we present results from new geological, geochemical, zircon U-Pb geochronological and Lu-Hf isotopic investigations on a suite of orthogneisses from the Taihua Group (THG) and Tietonggou Group (TGG). We also present geochronological data on schist and migmatite from the North Qinling belt (NQB) and metasedimentary rocks from the Wuguan unit (WGU) which is exposed along the southern side of the Shangdan suture zone. Two orthogneisSes from the THG define several stages of arc magmatism at similar to 2.51 Ga, similar to 2.34 Ga, similar to 2.28 Ga and similar to 2.16 Ga, followed by metamorphism at 1930 +/- 31 Ma. Zircons from the TGG trace a tectonothermal event at 1897 +/- 15 Ma. Geochemical data on biotite gneiss from the THG and the TTG (tonalite-trondhjemitegranodiorite) gneiss from the TGG classify these rocks as dacite and display volcanic arc affinity. Zircon Lu-Hf isotopic results suggest that the parental magma for the protolith of felsic gneisses were derived from Mesoarchean crustal components (T-DM(C) = 2766-3067 Ma). The amphibole gneiss from the THG classifies as metabasalt and the zircons from this rock show dominantly negative epsilon(Hf)(t) values varying from -10.3 to -4.6 and T-DM(C) range of 3088-3437 Ma, suggesting magma derivation by melting of Paleoarchean-Mesoarchean subducted oceanic crust.
机译：秦岭造山带保留了华北克拉通和华南克拉通之间长期收敛演化的记录。在这项研究中，我们介绍了来自新的地质，地球化学，锆石U-Pb地质年代学和Lu-Hf同位素研究的结果，这些研究来自太华集团（THG）和铁通沟集团（TGG）的一组片麻岩。我们还提供了北秦岭带（NQB）的片岩和辉长岩和and关单元（WGU）的准沉积岩的地质年代学数据，这些岩石沿上丹缝合带的南侧暴露。来自THG的两个正斜系定义了几个弧岩浆作用的阶段，类似于2.51 Ga，近似于2.34 Ga，近似于2.28 Ga，近似于2.16 Ga，随后是1930 +/- 31 Ma的变质作用。来自TGG的锆石追踪了1897 +/- 15 Ma的构造热事件。 THG的黑云母片麻岩和TGG的TTG片云母片麻岩的片岩地球化学数据将这些岩石归类为辉晶岩，并显示出火山弧亲和力。锆石Lu-Hf同位素结果表明，长英质片麻岩原生岩的母岩浆来自中古统壳构造（T-DM（C）= 2766-3067 Ma）。 THG的闪石片麻岩被分类为玄武岩，而该岩石的锆石显示出显着的负ε（Hf）（t）值，范围从-10.3到-4.6，T-DM（C）范围为3088-3437 Ma，表明岩浆衍生通过古古纪-中古纪俯冲洋壳的融化。

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