Results 131 to 140 of about 801 (184)
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Economic Geology, 1957
Concludes that structural features and zonal distribution of such minerals as mica, magnetite, columbite, and beryl in a zoned pegmatite dike in gneiss of the Odara area, Travancore, India, can be attributed to progressive crystallization of a pegmatitic magma, and that there is no evidence of hydrothermal replacement.
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Concludes that structural features and zonal distribution of such minerals as mica, magnetite, columbite, and beryl in a zoned pegmatite dike in gneiss of the Odara area, Travancore, India, can be attributed to progressive crystallization of a pegmatitic magma, and that there is no evidence of hydrothermal replacement.
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International Geology Review, 1968
Pegmatites of several areas are described. It is contended that their properties and relationships support Fersman's idea that pegmatites are magmatic rather than hydrothermal or metasomatic. The principal arguments are as follows: 1) contacts of the pegmatite material are sharp where it occurs in the original bides or in xenolithic fragments; 2) later
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Pegmatites of several areas are described. It is contended that their properties and relationships support Fersman's idea that pegmatites are magmatic rather than hydrothermal or metasomatic. The principal arguments are as follows: 1) contacts of the pegmatite material are sharp where it occurs in the original bides or in xenolithic fragments; 2) later
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Economic Geology, 1949
Montana pegmatites are of three main age groups: pre-Beltian, both metamorphosed and unmetamorphosed types; Laramide, associated with the Boulder batholith; and Tertiary, related to scattered alkalic stocks and small intrusives. Deposits of sillimanite, kyanite, corundum, mica, fergusonite, and chromite occur with pre-Beltian pegmatites.
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Montana pegmatites are of three main age groups: pre-Beltian, both metamorphosed and unmetamorphosed types; Laramide, associated with the Boulder batholith; and Tertiary, related to scattered alkalic stocks and small intrusives. Deposits of sillimanite, kyanite, corundum, mica, fergusonite, and chromite occur with pre-Beltian pegmatites.
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Northfieldite, pegmatite, and pegmatite schist
American Journal of Science, 1915openaire +1 more source
Distribution of Permian pegmatites and spodumene pegmatites in the Austroalpine unit
Lithium ist ein Metall, das in der heutigen Gesellschaft unverzichtbar geworden ist, und die Nachfrage nach Lithium steigt ständig. Aus diesem Grund könnten kleine Lithiumvorkommen wie Spodumen-Pegmatite aus dem Ostalpinen Kristallin in Zukunft von wirtschaftlicher Bedeutung sein.openaire +1 more source