U-Pb SHRIMP zircon geochronology, petrogenesis, and tectonic setting of the Neoproterozoic Baekdong ultramafic rocks in the Hongseong Collision Belt, South Korea

C. W. Oh, J. Seo, Seon-Gyu Choi, V. J. Rajesh, J. H. Lee

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The Hongseong area, located in the western Gyeonggi Massif, South Korea, can be correlated with the northern margin of the South China block (Yangtze Craton). This area experienced Neoproterozoic igneous activity related to subduction before the amalgamation of Rodinia. Several isolated, lenticular, and serpentinized ultramafic-mafic bodies occur in the Hongseong area. The Baekdong body, one of the largest ultramafic bodies, has been highly deformed and metamorphosed to eclogite- and granulite-facies. The petrogenesis and tectonic environment of the Baekdong rocks are assessed using the composition of unaltered cores of spinel and olivine grains, and show that these rocks represent the mantle section of a suprasubduction ophiolite. The rocks originated from oceanic lithosphere that formed during the transition from nascent back-arc to mature island arc, related to subduction roll-back. During the back-arc stage, Al-rich spinel harzburgite formed through melt-rock interaction caused by the intrusion of magma. This magma was produced in small amounts, by less than 10% of partial melting of the wedge mantle. Subsequently, during the mature island arc stage, Cr-rich spinel dunite formed through melt-rock interaction caused by the intrusion of relatively evolved magma that formed by 30-35% partial melting due to a high input of volatiles from the subducted slab and sediments. The Baekdong ultramafic rocks, together with the Bibong ultramafic rocks, indicate that a suprasubduction tectonic setting prevailed before the amalgamation of Rodinia (at 860-890. Ma) in the Hongseong area, which may be an extension of the northern margin of the Yangtze Craton.

Original languageEnglish
Pages (from-to)100-112
Number of pages13
JournalLithos
Volume128-131
DOIs
Publication statusPublished - 2012 Jan 1

Fingerprint

Geochronology
Tectonics
ultramafic rock
petrogenesis
tectonic setting
geochronology
zircon
collision
Rocks
spinel
Rodinia
rock
magma
partial melting
island arc
craton
subduction
melt
mantle
harzburgite

Keywords

  • Baekdong
  • Hongseong
  • Neoproterozoic
  • Suprasubduction
  • Ultramafic

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

U-Pb SHRIMP zircon geochronology, petrogenesis, and tectonic setting of the Neoproterozoic Baekdong ultramafic rocks in the Hongseong Collision Belt, South Korea. / Oh, C. W.; Seo, J.; Choi, Seon-Gyu; Rajesh, V. J.; Lee, J. H.

In: Lithos, Vol. 128-131, 01.01.2012, p. 100-112.

Research output: Contribution to journalArticle

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abstract = "The Hongseong area, located in the western Gyeonggi Massif, South Korea, can be correlated with the northern margin of the South China block (Yangtze Craton). This area experienced Neoproterozoic igneous activity related to subduction before the amalgamation of Rodinia. Several isolated, lenticular, and serpentinized ultramafic-mafic bodies occur in the Hongseong area. The Baekdong body, one of the largest ultramafic bodies, has been highly deformed and metamorphosed to eclogite- and granulite-facies. The petrogenesis and tectonic environment of the Baekdong rocks are assessed using the composition of unaltered cores of spinel and olivine grains, and show that these rocks represent the mantle section of a suprasubduction ophiolite. The rocks originated from oceanic lithosphere that formed during the transition from nascent back-arc to mature island arc, related to subduction roll-back. During the back-arc stage, Al-rich spinel harzburgite formed through melt-rock interaction caused by the intrusion of magma. This magma was produced in small amounts, by less than 10{\%} of partial melting of the wedge mantle. Subsequently, during the mature island arc stage, Cr-rich spinel dunite formed through melt-rock interaction caused by the intrusion of relatively evolved magma that formed by 30-35{\%} partial melting due to a high input of volatiles from the subducted slab and sediments. The Baekdong ultramafic rocks, together with the Bibong ultramafic rocks, indicate that a suprasubduction tectonic setting prevailed before the amalgamation of Rodinia (at 860-890. Ma) in the Hongseong area, which may be an extension of the northern margin of the Yangtze Craton.",
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