Early cretaceous paleogeography of Korea and Southwest Japan inferred from occurrence of detrital chromian spinels
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概要
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The Sindong Group was deposited in the north-south trending half-graben Nakdong Trough, southern Korean peninsula. The occurrence of detrital chromian spinels from the Jinju Formation of the Sindong Group in the Gyeongsang Basin means that the mafic to ultramafic rocks were exposed in its provenance. The chromian spinels from the Jinju Formation are characterized by extremely low TiO2 and Fe3+. Moreover, their range of Cr# is from 0.45 to 0.80 and makes a single trend with Mg#. The chemistry of chromian spinels implies that the source rocks for chromian spinels were peridotites or serpentinites, which originated in the mantle wedge. To more narrowly constrain their source rocks, the Ulsan and Andong serpentinites exposed in the Gyeongsang Basin were examined petrographically. Chromian spinels in the Andong serpentinite differ from those of the Jinju Formation and those in the Ulsan serpentinite partly resemble them. Furthermore, the Jinju chromian spinel suite is similar to the detrital chromian spinels from the Mesozoic sediments in the Circum-Hida Tectonic zone, which includes the Nagato Tectonic zone in Southwest Japan and the Joetsu Belt in Northeast Japan. This suggests that the basement rocks, which were located along the main fault bounding the eastern edge of the Nakdong Trough, had exposures of peridotite or serpentinite. It is possible that the Nakdong Trough was directly adjacent to the Circum-Hida Tectonic zone before the opening of the Sea of Japan (East Sea). © 2008 The Authors Journal compilation © 2008 Blackwell Publishing Asia Pty Ltd.
- Blackwell Publishingの論文
- 2008-12-01
著者
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HISADA KEN-ICHIRO
Graduate School of Life and Environmental Sciences, University of Tsukuba
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Hisada K
Graduate School Of Life And Environmental Sciences University Of Tsukuba
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Hisada Ken‐ichiro
Univ. Tsukuba Ibaraki Jpn
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Hisada Ken-ichiro
Graduate School Of Life And Environmental Sciences University Of Tsukuba
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Lee Yong
Seoul National Univ. Seoul Kor
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Lee Yong
School Of Earth And Environmental Sciences Seoul National University
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Arai Shoji
Department Of Earth Sciences Faculty Of Science Kanazawa University
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TAKASHIMA SHIZUKA
Graduate School of Life and Environmental Sciences, University of Tsukuba
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Takashima Shizuka
Graduate School Of Life And Environmental Sciences University Of Tsukuba
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Lee Yong
School Of Bioscience And Biotechnology And Institute Of Bioscience And Biotechnology Kangwon Nationa
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ARAI Shoji
Department of Earth Science, Graduate School of Science and Technology, Kanazawa University
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