Publishing House SB RAS:

Publishing House SB RAS:

Address of the Publishing House SB RAS:
Morskoy pr. 2, 630090 Novosibirsk, Russia



Advanced Search

Russian Geology and Geophysics

2007 year, number 1

DZHIDA ISLAND-ARC SYSTEM IN THE PALEOASIAN OCEAN: STRUCTURE AND MAIN STAGES OF VENDIAN-PALEOZOIC GEODYNAMIC EVOLUTION

I.V. Gordienko a , A.V. Filimonov a , O.R. Minina a , M.A. Gornova b , A.Ya. Medvedev b , V.S. Klimuk a , A.L. Elbaev a , O. Tomurtogoo c
a Geological Institute, Siberian Branch of the RAS, 6a ul. Sakhyanovoi, Ulan Ude, 670047, Russia
b Vinogradov Institute of Geochemistry, Siberian Branch of the RAS, 1a ul. Favorskogo, 664033, Irkutsk, Russia
c Institute of Geology and Mineral Resources, National Academy of Mongolia, 63 prosp. Mira, Ulaanbaatar, Mongolia
Keywords: Island arc, oceanic islands, back-arc basins, oceanic crust, spreading, subduction, collision, sedimentation, magmatism, Paleoasian Ocean
Pages: 91-106

Abstract

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).