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Paleozoic Accretion-Collision Events and Kinematics of Ductile Deformation in the Eastern Part of the southern-central tianshan belt, China

引用

Acta Geologica Sinica(English Edition) 2002年第3期76卷 308-323页

作者：舒良树 J.Charvet 卢华复 S.C.LAURENT Department of Earth Sciences and State Key Laboratory of Metallization Nanjing University Nanjing 210093 China UMR 6530 CNRS FR009 Departement des Sciences de la Terre Université d'Orléans 45067 Orléans France

The tianshan range could have been built by both late Early Paleozoicaccretion and Late Paleozoic collision events. The late Early Paleozoic Aqqikkudug-Weiya suture ismarked by Ordovician ophiolitic melange and a Silurian flysch sequence, high-pressure metamorphicrelics, and mylonitized rocks. The central tianshan belt could principally be an Ordovician volcanicarc; whereas the South tianshan belt, a back-arc basin. Macro- and microstructures, along withunconformities, provide some kinematic and chronological constraints on 2-phase ductile *** earlier ductile deformation occurring at ca. 400 Ma was marked by north-verging ductileshearing, yielding granulite-bearing ophiolitic melange blocks and garnet-pyroxene-facies ductiledeformation, and the later deformation, a dextral strike-slip tectonic process, occurred during theLate Carboniferous-Early Permian. Early Carboniferous molasses were deposited unconformably onpre-Carboniferous metamorphic and ductilely sheared rocks, implying the end of the early *** large-scale ductile strike-slip along the Aqqikkudug-Weiya zone was possibly caused by thesecond tectonic event, the Hercynian collision between the northern Tarim block and the southernSiberian block. Late Paleozoic granitic magmatism and superimposed structures overprinted this EarlyPaleozoic deformation belt. Results of geometric and kinematic studies suggest that the primaryframework of the southern-central tianshan belt, at least the eastern part of the tianshan belt, wasbuilt by these two phases of accretion events.

关键词： kinematics ductile deformation collision-accretion Paleozoic southern-central tianshan belt

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