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- W2313874986 startingPage "715" @default.
- W2313874986 abstract "The Niquelandia igneous layered complex is made up of a lower sequence (LS), consisting of a basal layered zone (gabbros, peridotites, and pyroxenites), followed by an ultramafic zone (peridotites and pyroxenites), followed in turn by layered gabbros, and an upper sequence (US), composed of coronitic gabbros and anorthosites and upper amphibolites. Its stratigraphy and the proportion between ultramafic and gabbroic units resemble those of other layered complexes of the world, e.g. Stillwater and Bushveld. The LS and US have different fractionation trends related to the different liquidus phases, viz. ol (±sp), cpx and opx in the LS and ol, pl, and cpx in the US. Differentiates appear at the top of both the LS and US. The possibility that the Niquelandia complex is formed by two unrelated intrusions is rejected and a model accounting for the fractionation pattern is presented. This model implies that, during crystallization, water caused a decrease in the temperature of the liquidus of the magma in the upper portion of the chamber. Taking into account the shape of the geotherm and its intersections with the liquidus temperature gradient, a point was reached at which crystallization may have occurred simultaneously in the lower and upper portions of the magma chamber, leaving differentiated residua both at the roof and in the middle of the complex. The inferred composition of the parent magma is that of a low-Ti picritic basalt of possibly transitional character, poor in incompatible elements and rich in Cr and Ni. These characteristics imply a derivation by extensive partial melting of a relatively depleted source in a tensional environment. The composition of the liquid and the occurrence of metamorphic xenoliths of the country-rock in the uppermost gabbros suggest that the complex intruded the continental crust during a rifting episode. The abnormal thickness of the complex (14 500 m) implies a continental crust comparable in thickness to the present one." @default.
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- W2313874986 date "1986-06-01" @default.
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- W2313874986 title "The Petrogenesis of the Niquelandia Layered Basic-Ultrabasic Complex, Central Goias, Brazil" @default.
- W2313874986 doi "https://doi.org/10.1093/petrology/27.3.715" @default.
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