Dzhida island-arc system in the Paleoasian Ocean: structure and main stages of Vendian-Paleozoic geodynamic evolution

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• 作者：I.V. Gordienko ; A.V. Filimonov ; O.R. Minina ; M.A. Gornova ; A.Ya. Medvedev ; V.S. Klimuk ; A.L. Elbaev ; O. Tomurtogoo
• 关键词：Island arc ; oceanic islands ; back-arc basins ; oceanic crust ; spreading ; subduction ; collision ; sedimentation ; magmatism ; Paleoasian Ocean
• 刊名：Russian Geology and Geophysics
• 出版年：2007
• 出版时间：January 2007
• 年：2007
• 卷：48
• 期：1
• 页码：91-106
• 全文大小：1011 K

文摘

We propose a model of the geodynamic evolution of the Dzhida island-arc system of the Paleoasian Ocean margin which records transformation of an oceanic basin into an accretion-collision orogenic belt. The system includes several Vendian-Paleozoic complexes that represent a mature oceanic island arc with an accretionary prism, oceanic islands, marginal and remnant seas, and Early Ordovician collisional granitoids. We have revealed a number of subunits (sedimentary sequences and igneous complexes) in the complexes and reconstructed their geodynamic settings. The tectonic evolution of the Dzhida island-arc system comprises five stages: (1) ocean opening (Late Riphean); (2) subduction and initiation of an island arc (Vendian-Early Cambrian); (3) subduction and development of a mature island arc (Middle-Late Cambrian); (4) accretion and formation of local collision zones and remnant basins (Early Ordovician-Devonian); and (5) postcollisional strike-slip faulting (Carboniferous-Permian).