Petrology of the Yugu peridotites in the Gyeonggi Massif, South Korea: Implications for its origin and hydration process
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概要
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Peridotites exposed in the Yugu area in the Gyeonggi Massif, South Korea, near the boundary with the Okcheon Belt, exhibit mylonitic to strongly porphyroclastic textures, and are mostly spinel lherzolites. Subordinate dunites, harzburgites, and websterites are associated with the lherzolites. Amphiboles, often zoned from hornblende in the core to tremolite in the rim, are found only as neoblasts. Porphyroclasts have recorded equilibrium temperatures of about 1000°C, whereas neoblasts denote lower temperatures, about 800°C. Olivines are Fo 90-91 in lherzolites and Fo 91 in a dunite and a harzburgite. The Cr# (=Cr/(Cr + Al) atomic ratio) of spinels varies together with the Fo of olivines, being from 0.1 to 0.3 in lherzolites and around 0.5 in the dunite and harzburgite. The Na2O content of clinopyroxene porphyroclasts is relatively low, around 0.3 to 0.5 wt% in the most fertile lherzolite. The Yugu peridotites are similar in porphyroclast mineral chemistry not to continental spinel peridotites but to sub-arc or abyssal peridotites. Textural and mineralogical characteristics indicate the successive cooling with hydration from the upper mantle to crustal conditions for the Yugu peridotites. Almost all clinopyroxenes and amphiboles show the same U-shaped rare earth element (REE) patterns although the level is up to ten times higher for the latter. The hydration was associated with enrichment in light REE, resulting from either a slab-derived fluid or a fluid circulating in the crust. The mantle-wedge or abyssal peridotites were emplaced into the continental crust as the Yugu peridotite body during collision of continents to form a high-pressure metamorphic belt in the Gyeonggi Massif. The peridotites from the Gyeonggi Massif exhibit lower-pressure equilibration than peridotites, with or without garnets, from the Dabie-Sulu Collision Belt, China, which is possibly a westward extension of the Gyeonggi Massif. © 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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ARAI Shoji
Department of Earth Sciences, Kanazawa University
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角島 和之
深海資源開発(株)
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Hisada Ken-ichiro
Graduate School Of Life And Environmental Sciences University Of Tsukuba
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Kadoshima Kazuyuki
Department Of Earth Sciences Kanazawa University
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Tamura Akihiro
Earth Science Course School Of Natural System College Of Science And Engineering Kanazawa University
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Ishimaru Satoko
Earth Science Course School Of Natural System College Of Science And Engineering Kanazawa University
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Ishimaru Satoko
Department Of Earth Sciences Faculty Of Science Kanazawa University
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Lee Yong-il
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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Tamura Akihiro
Department Of Architecture Faculty Of Engineering Yokohama National University
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Arai Shoji
Kanazawa University
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TAMURA Akihiro
Department of Architecture and Building Science, Faculty of Engineering, Yokohama National University
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