Strongly Peraluminous Granites across the Archean–Proterozoic Transition
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چکیده
منابع مشابه
Jurassic peraluminous gneissic granites in axial zone of Peninsular Ranges, southern California
The Peninsular Ranges batholith of southern California and Baja California, México, is well recognized as a prime example of an I-type Cretaceous batholith. Often overlooked, however, is a volumetrically signiÞ cant amount of pre-Cretaceous gneissic granite in the axial zone of the batholith. New U-Pb zircon age data conÞ rm that the metaluminous and peraluminous plutonic bodies were emplaced d...
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A comparison was made between single-crystal structure refinements, electron microprobe analyses and octahedral site populations of seven biotite crystals and data obtained previously for coexisting muscovite in peraluminous granites using the same methods. Both micas, from several plutons of Northern Victoria Land (Antarctica) and Sardinia (Italy), show significant octahedral substitutions: bi...
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In this presentation questions are raised about a melt-restite unmixing model proposed by Barton and Sidle (1994) for the myrmekite-bearing Waldoboro granite complex along the southeastern coast of Maine (USA). This complex consists mostly of granite/granodiorite gneiss and granite, but smaller masses of quartz diorite, aplite, pegmatite, leucogranite, tourmaline granite, and granite porphyry o...
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We examine the local density of states and the momentum-dependent distribution functions as they evolve in time for systems described by the FalicovKimball model initially in equilibrium, and then driven by a large uniform electric field turned on at time t = 0. We use exact dynamical mean-field theory, extended to nonequilibrium situations, to solve the problem. We focus on the accuracy of the...
متن کاملThe transition from peraluminous to peralkaline granitic melts: Evidence from melt inclusions and accessory minerals
Fractional crystallization of peraluminous Fand H2O-rich granite magmas progressively enriches the remaining melt with volatiles. We show that, at saturation, the melt may separate into two immiscible conjugate melt fractions, one of the fractions shows increasing peraluminosity and the other increasing peralkalinity. These melt fractions also fractionate the incompatible elements to significan...
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ژورنال
عنوان ژورنال: Journal of Petrology
سال: 2019
ISSN: 0022-3530,1460-2415
DOI: 10.1093/petrology/egz033