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

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).

Zircon U–Pb ages of the metamorphic supracrustal rocks of the Xinghuadukou Group and granitic complexes in the Argun massif of the northern Great Hinggan Range, NE China, and their tectonic implications

“…Based on studies of the Neoproterozoic orogeny in the TuvaMongolia massif (Kuzmichev et al, 2001), the Shishkhid ophiolite, northern Mongolia (Kuzmichev et al, 2005) and the Dzhida islandarc system near the Tuva-Mongolia massif (Gordienko et al, 2007), the above authors suggested that the breakup of the Rodinia supercontinent occurred during the Middle Neoproterozoic, resulting in a chain of Precambrian massifs including the Tuva-Mongolia, Central Mongolia and Argun massifs separating from the Siberian continent and the passive margin succession developing along the southern edge of the Siberia. Extensive rifting in South China began in $825 Ma (Zhou et al, 2007;Li et al, 2008;Wang et al, 2008), resulting in intraplate magmatism during the period of 825-720 Ma.…”

Late Paleozoic low-angle southward-dipping thrust in the Züünharaa area, Mongolia: tectonic implications for the geological structures in the Sayan-Baikal and Hangai-Daur belts

“…The Central Mongol and Tuva Mongol are considered to be Precambrian continental fragments, while the Dzhida and Khamar Daban terranes are regarded to be Early Paleozoic accretion-collision orogens with a complex N-verging fold-thrust structure (e.g., Tomurtogoo 2006;Belichenko et al 2003;Gordienko et al 2007). The Tunka terrane is located on the west side of the southern rim of the Siberian craton (Fig.…”

The Fazenda Gavião granodiorite and associated potassic plutons as evidence for Palaeoproterozoic arc-continent collision in the Rio Itapicuru greenstone belt, Brazil

“…The magmatic evolution observed in active and recent arccontinent collisions on the west Pacific (e.g., Van Berger at al., 1993;Elburg and Foden, 1998;Elburg et al, 2002Elburg et al, , 2005Wang et al, 2004;Huang et al, 2006) provides important information to interpret ancient orogens as remnants of island arc-continent collision (e.g., Corriveau, 1990;Draut and Clift, 2001;Draut et al, 2002Draut et al, , 2009Brown et al, 2006;Chew et al, 2007;Gordienko et al, 2007, Van Staal et al, 2007.…”

“…In active and "recent" arc-continent collisions on the western Pacific the observed magmatic evolution from low-middle-K calc-alkaline to high-K to potassic plutonic rocks (e.g., Van Bergen et al, 1993;Elburg et al, 2002Elburg et al, , 2005Wang et al, 2004;Huang et al, 2006) provides important information to interpret ancient orogens as remnants of island arc-continent collision (e.g., Draut and Clift, 2001;Brown et al, 2006;Chew et al, 2007;Gordienko et al, 2007).…”