Detrital chromian spinels in Devonian-Carboniferous sandstones of Hikoroichi area,NE Japan : their provenance and tectonic relationship

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概要

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• A total of 30 sandstones were collected from the well-defined mappable units of Middle Devonian to Early Carboniferous ages in the South Kitakami Terrane(=SKT) NE Japan, They are classified as litharenite, feldspathic litharenite,and lithic arkose. QFL discimination diagram of the studied sandstones indicates the provenance of magniatic arcs, Detrital chromian spinels, present as accessory minerals in the rocks, are discovered from 6 clastic samples, A total of 37 detrital chromian spinels are detemined for their major-oxide analysis using EPMA,Fe-Cr-Al diagram displays rather low Fe 3+ values suggesting the provenance from ultramafic regions. The result also indicates that most chromian spinels have wider ranges of Cr/(Cr+Al). The rather low values of TiO,contents suggest that the sandstone-hosted spinels were derived from ultramafic provenance. These lines of evidence support the idea that spinel-bearing sandstones were derived from ultramafic sources occurring in the fore-are leclonic setting of the northern peri-Gondwana Land.

• 筑波大学の論文
• 2002-03-29

著者

• Charusiri P

  Chulalongkorn Univ.

関連論文

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• Detrital chromian spinels in Devonian-Carboniferous sandstones of Hikoroichi area,NE Japan : their provenance and tectonic relationship

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