Trace element compositions of jadeite (+omphacite) in jadeitites from the Itoigawa-Ohmi district, Japan: Implications for fluid processes in subduction zones
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概要
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Trace-element compositions of jadeite (±omphacite) in jadeitites from the Itoigawa-Ohmi district of Japan, analyzed by a laser-ablation inductively coupled plasma mass spectrometry technique showed chemical zoning within individual grains and variations within each sample and between different samples. Primitive mantle-normalized patterns of jadeite in the samples generally showed high large-ion lithophile element contents, high light rare earth element/heavy rare earth element ratios and positive anomalies of high field strength elements. The studied jadeitites have no signatures of the protolith texture or mineralogy. Shapes and distributions of minerals coupled with chemical zoning within grains suggest that the jadeitites were formed by direct precipitation of minerals from aqueous fluids or complete metasomatic modification of the precursor rocks by fluids. In either case, the geochemical characteristics of jadeite are highly affected by fluids enriched in both large-ion lithophile elements and high field strength elements. The specific fluids responsible for the formation of jadeitites are related to serpentinization by slab-derived fluids in subduction zones. This process is followed by dissolving high field strength elements in the subducting crust as the fluids continue to circulate into the subducting crusts and serpentinized peridotites. The fluids have variations in chemical compositions corresponding to various degrees of water-rock interactions. © 2007 The Authors; Journal compilation © 2007 Blackwell Publishing Asia Pty Ltd.
- Blackwell Publishingの論文
- 2007-03-01
著者
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MORISHITA TOMOAKI
Graduate School of Natural Science and Technology, Kanazawa University
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Ishida Yoshito
Department Of Earth Sciences Kanazawa University
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Ishida Yoshito
Department Of Earth Sciences Faculty Of Sciences Kanazawa University
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Morishita Tomoaki
Frontier Science Organization Kanazawa University
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Morishita Tomoaki
Graduate School Of Agriculture Hokkaido University:(present Address)forestry And Forest Products Res
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ARAI SHOJI
Graduate School of Natural Science and Technology, Kanazawa University
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Arai Shoji
Faculty Of Science Department Of Earth Science Kanazawa University
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Arai Shoji
Kanazawa University
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Arai Shoji
Graduate School Of Natural Science And Technology Kanazawa University
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