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- W1964491181 abstract "The western margin of the postorogenic Akash granite, 30 km E of Ha'il in the northern Arabian Shield, is greisenized and contains anomalous concentrations of Sn. The pluton intrudes metamorphic and intrusive rocks, and crops out as a 10 by 15 km elliptical body with its long axis oriented N. It consists predominantly of metaluminous alkali-feldspar granite or syenogranite, with accessory biotite and muscovite, and traces of fluorite. Greisenization extends discontinuously in a zone at least 3 km long parallel to the western contact, and along E-trending hematitic quartz veins for more than 2 km from the contact. The veins occupy fractures that were probably conduits for ascending mineralizing fluids. Within about 20 m of the contact, they are enclosed in quartz—white mica greisen containing hematite, fluorite, and locally, topaz and cassiterite. Composite chip samples from the greisenized zone have an average Sn content of 710 ppm, and a maximum of 1600 ppm. Anomalous values for Zn, Fe, Mn, Mo, Bi and Cu also occur, but none of the samples contain detectable W. Three samples of hematitic quartz averaged 126 ppm Sn, and one contained 200 ppm W." @default.
- W1964491181 created "2016-06-24" @default.
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- W1964491181 creator A5069819494 @default.
- W1964491181 date "1986-01-01" @default.
- W1964491181 modified "2023-09-25" @default.
- W1964491181 title "Geology and tin-greisen mineralization of the Akash granite, northern Arabian Shield" @default.
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- W1964491181 doi "https://doi.org/10.1016/s0899-5362(86)80082-3" @default.
- W1964491181 hasPublicationYear "1986" @default.
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