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- W2765481618 abstract "Abstract Bavenite, (Ca4[(Al,Be)4(Si9(O,OH)26-n)](OH)2+n), is present in a pegmatite of the Paarl Pluton, a metaluminous I-type granite of Late Precambrian age. We are not aware of any other previous description of a beryllium mineral occurrence in the Cape Granite Suite. The pegmatite consists essentially of quartz and microcline microperthite together with albite, calcite and fluorite. A hydrothermal alteration assemblage of epidote, chlorite and bavenite occurs in vugs and veins within the pegmatite. Stilbite, which is stable below 170ºC, is also present, but not texturally related to the alteration assemblage. Microthermometric analyses and mineral chemistry of associated minerals elucidate the conditions of formation for the bavenite. According to primary fluid inclusions in the cores of euhedral quartz, the minimum temperature of crystallization of the pegmatite is 450ºC. Homogenization temperatures of later fluids indicate a minimum temperature of 210ºC for the main hydrothermal event. Chlorite geothermometry yields crystallization temperatures around 320ºC. The bavenite formed between 210ºC and 320ºC, at a pressure of less than 2 kbar." @default.
- W2765481618 created "2017-11-10" @default.
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- W2765481618 date "2017-06-01" @default.
- W2765481618 modified "2023-09-23" @default.
- W2765481618 title "An occurrence of bavenite in the Cape Granite Suite, southwestern Cape Province, South Africa, and its implication on the formation of the host pegmatite" @default.
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- W2765481618 doi "https://doi.org/10.25131/gssajg.120.2.223" @default.
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