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Mineral ages and zircon Hf isotopic composition of the Andong ultramafic complex: implications for the evolution of Mesozoic subduction system and subcontinental lithospheric mantle beneath SE Korea

Published online by Cambridge University Press:  18 October 2013

GI YOUNG JEONG ,
CHANG-SIK CHEONG ,
KEEWOOK YI ,
JEONGMIN KIM ,
NAMHOON KIM ,
SEOK-KI KWON ,
JIAN-ZHEN GENG  and
HUAI-KUN LI
GI YOUNG JEONG
Affiliation:
Department of Earth and Environmental Sciences, Andong National University, Andong, Gyeongsangbukdo 760-749, Republic of Korea
CHANG-SIK CHEONG*
Affiliation:
Division of Earth and Environmental Sciences, Korea Basic Science Institute, 162 Yeongudanji-ro, Ochang-eup, Cheongwon-gun, Chungcheongbukdo 363-883, Republic of Korea Graduate School of Analytical Science and Technology, Chungnam National University, 99 Daehangno, Yuseong, Daejeon 305-764, Republic of Korea
KEEWOOK YI
Affiliation:
Division of Earth and Environmental Sciences, Korea Basic Science Institute, 162 Yeongudanji-ro, Ochang-eup, Cheongwon-gun, Chungcheongbukdo 363-883, Republic of Korea
JEONGMIN KIM
Affiliation:
Division of Earth and Environmental Sciences, Korea Basic Science Institute, 162 Yeongudanji-ro, Ochang-eup, Cheongwon-gun, Chungcheongbukdo 363-883, Republic of Korea
NAMHOON KIM
Affiliation:
Division of Earth and Environmental Sciences, Korea Basic Science Institute, 162 Yeongudanji-ro, Ochang-eup, Cheongwon-gun, Chungcheongbukdo 363-883, Republic of Korea
SEOK-KI KWON
Affiliation:
Geological Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Republic of Korea
JIAN-ZHEN GENG
Affiliation:
Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China
HUAI-KUN LI
Affiliation:
Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China
*
§Author for correspondence: [email protected]
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Abstract

The Phanerozoic subduction system of the Korean peninsula is considered to have been activated by at least Middle Permian time. The geochemically arc-like Andong ultramafic complex (AUC) occurring along the border between the Precambrian Yeongnam massif and the Cretaceous Gyeongsang back-arc basin provides a rare opportunity for direct study of the pre-Cretaceous mantle wedge lying above the subduction zone. The tightly constrained SHRIMP U–Pb age of zircons extracted from orthopyroxenite specimens (222.1±1.0 Ma) is indistinguishable from the Ar/Ar age of coexisting phlogopite (220±6 Ma). These ages represent the timing of suprasubduction zone magmatism likely in response to the sinking of cold and dense oceanic lithosphere and the resultant extensional strain regime in a nascent arc environment. The nearly coeval occurrence of a syenite-gabbro-monzonite suite in the SW Yeongnam massif also suggests an extensional tectonic setting along the continental margin side during Late Triassic time. The relatively enriched ɛHf range of dated zircons (+6.2 to −0.6 at 222 Ma) is in contrast to previously reported primitive Sr–Nd–Hf isotopic features of Cenozoic mantle xenoliths from Korea and eastern China. This enrichment is not ascribed to contamination by the hypothetical Palaeozoic crust beneath SE Korea, but is instead attributable to metasomatism of the lithospheric mantle during the earlier subduction of the palaeo-Pacific plate. Most AUC zircons show a restricted core-to-rim spread of ɛHf values, but some grains testify to the operation of open-system processes during magmatic differentiation.

Keywords

ultramafic complexzirconU–Pb ageHf isotopeslithospheric mantle
Type
Original Articles
Information
Geological Magazine , Volume 151 , Issue 5 , September 2014 , pp. 765 - 776
Copyright
Copyright © Cambridge University Press 2013 

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