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• W2012028150 abstract "Metallogenetically specialized felsic plutons are widespread in the Arabian Shield, but are concentrated in several belts and clusters. They are discordant bodies of unfoliated, equigranular to porphyritic, alkali granite, alkali-feldspar granite, monzogranite or (quartz) syenite. A computerized data-base containing 159 major-oxide and trace-element analyses representing these rocks has been compiled and statistically analysed. Four types of specialization can be distinguished: (1) rocks of agpaitic type are mostly alkali granite. Relative to other specialized types, they have high REE, Nb, Y, Zn and Zr, but low Ba, Li, Pb and Sr. Their precursors were plutons of the alkali granite association, and they are related to mineral deposits containing Nb, Th, Zr, REE and other granitophile elements; (2) rocks of plumasitic type are the most numerous, and are generally leucocratic alkali-feldspar granites with traces of muscovite, biotite, fluorite, or rarely sodic amphibole or topaz. They are characterized by high Be, Li, Nb, Pb, Rb, Sn, Ta, Th, U and Y, but low Ba, Ce, Cu, La, Ni, Sr, V and Zr. Their precursors were plutons of the alkali-feldspar granite association and they are associated with SnTaNbWF mineralization; (3) rocks of the calcic type are inconspicuous biotitic monzogranites to granodiorites characterized by high Ba, Pb, Sr and V, but relatively low Be, Li, Nb, Rb, Sn, U, Y, Zn and Zr. Their precursors were plutons of the monzogranite association and they are associated with MoBiW mineralization; (4) (quartz) syenites and (quartz) monzonites of the miaskitic type are the least common. They are characterized by high Ba, Co, La, Nd, Sc, Sr, V and Zr, and low Li, Nb, Pb, Rb, Sn, U and Y. Their precursors were plutons of the syenite association and they are associated with mineralization of several different types. There appears to be no single parameter which reliably distinguishes specialized rocks as a whole from unspecialized rocks, but the following granitophile-element concentrations suggest specialized character: F > 1000, Be > 7, La > 70, Li > 40, Nb > 70, Rb > 200, Y > 60, Ba < 200, and Sr < 80 ppm. Ratios of selected elements (notably Rb/Sr > 18, Y/Ba > 4, Rb/Ba > 6, Ba/Be > 10 or K/Rb < 200) may also be indicative. Specialized varieties of an established association can be more readily distinguished by a number of trace-element parameters. Specialized rocks of unknown type can best be classed by evaluating multivariate classification functions based on either major-oxide or trace-element parameters." @default.
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• W2012028150 date "1986-01-01" @default.
• W2012028150 modified "2023-09-27" @default.
• W2012028150 title "Specialized felsic plutonic rocks of the Arabian Shield and their precursors" @default.
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• W2012028150 doi "https://doi.org/10.1016/s0899-5362(86)80076-8" @default.
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