PRELIMINARY PETROLOGICAL STUDIES OF THE METAMORPHIC ROCKS OF THE EASTERN SOR RONDANE MOUNTAINS
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概要
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The eastern Sor Rondane Mountains is largely underlain by biotite and biotite-hornblende quartzo-feldspathic gneisses, in which six rock types occur as lenses ranging from <1m to> 1km in extent : (1) manganese quartzite and iron-rich mafic granulite (2) mafic granulites and amphibolites, (3) ultramafics, (4) garnet-biotite and biotite gneisses, (5) marble and calc-silicate rocks, and (6) cummingtonite ± orthopyroxene orthogneiss. Distinctive mineral assemblages include plagioclase-K-feldspar-fayalite-hedenbergite/augite-ferrosilite-ferropargasitic hornblende-almandine-ilmenite-magnetite-graphite-allanite-pyrrhotite in iron-rich mafic granulite, quartz-spessartine-pyroxmangite-manganoan pigeonite-manganoan augite-manganoan ilmenite (+pyrophanite)-tirodite (secondary) in a manganese quartzite, pyropic garnet-biotite-clinopyroxene-hornblende-anorthite in mafic granulite, sillimanite-garnet-spinel ± corundum (no cordierite) in garnet-biotite gneiss, and forsterite-spinel-calcite and forsterite-diopside-calcite-dolomite in marbles. Secondary minerals include clinohumite, geikielite and Mg-allanite in marble and margarite and hogbomite in amphibolite. Kyanite relics are found in plagioclase in metapelite and with gedrite in garnet in a biotite ± spinel ± corundum schist; these imply pressures above 4kbar on the prograde path. Pressures and temperatures calculated from mineral compositions are ≥7kbar and 700-750℃ for an early granulite facies event and 500-600℃ for a later, discrete amphibolite facies event. Introduction of rare elements during the latter event and subsequent retrogression in the greenschist facies resulted in the local development of tourmaline, fluorite, allanite (in part) and a mineral of the zirconolite group.
- 国立極地研究所の論文
著者
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Grew Edward
Department Of Geological Sciences University Of Maine
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Grew E.
Department Of Geological Science University Of Maine
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Grew Edwqrd
メーン大学
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Grew E.
メーン大
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Grew Edward
Department Of Geological Science University Of Maine
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ASAMI Masao
Department of Geological Sciences, College of Liberal Arts, Okayama, University
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MAKIMOTO Hiroshi
Geological Survey of Japan
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Asami M
Department Of Earth Sciences Faculty Of Science Okayama University
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Asami Masao
Department Of Geological Sciences College Of Liberal Arts Okayama University
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Asami Masao
Department of Earth Sciences, Faculty of Science, Okayama University
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