Neoproterozoic tectonic evolution of the Hongseong area, southwestern Gyeonggi Massif, South Korea; implication for the tectonic evolution of Northeast Asia

C. W. Oh, Seon-Gyu Choi, J. Seo, V. J. Rajesh, J. H. Lee, M. Zhai, P. Peng

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47 Citations (Scopus)

Abstract

Two types of Neoproterozoic metabasites occur together with regionally intruded arc-related Neoproterozoic granitoids (ca. 850-830 Ma) in the Hongseong area, southwestern Gyeonggi Massif, South Korea, which is the extension of the Dabie-Sulu collision belt in China. The first type of metabasite (the Bibong and Baekdong metabasites) is a MORB-like back-arc basin basalt or gabbro formed at ca. 890-860 Ma. The Bibong and Baekdong metabasites may have formed during back-arc opening by diapiric upwelling of deep asthenospheric mantle which was metasomatized by large ion lithophile element (LILE) enriched melt or fluid derived from the subducted slab and/or subducted sediment beneath the arc axis. The second type of metabasite (the Gwangcheon metabasite) formed in a plume-related intra-continental rift setting at 763.5 ± 18.3 Ma and is geochemically similar to oceanic island basalt (OIB). These data indicate a transition in tectonic setting in the Hongseong area from arc to intra-continental rift between ca. 830 and 760 Ma. This transition is well correlated to the Neoproterozoic transition from arc to intra-continental rift tectonic setting at the margin of the Yangtze Craton and corresponds to the amalgamation and breakup of Rodinia Supercontinent.

Original languageEnglish
Pages (from-to)272-284
Number of pages13
JournalGondwana Research
Volume16
Issue number2
DOIs
Publication statusPublished - 2009 Oct 1

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Keywords

  • Arc
  • Hongseong area
  • Intra-continental rift
  • Neoproterozoic
  • Tectonics
  • Transition
  • Yangtze Craton

ASJC Scopus subject areas

  • Geology

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