QUENCH TEXTURES IN BASALTS OF THE MINERAL FIELD HIERRO-MANTUA. PINAR DEL RÍO PROVINCE
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Abstract
The Hierro-Mantua mineral field (Pinar del Río, Cuba) is a deposit type siliciclastic- mafic VMS of lenticular morphology in concordance with host rocks belonging to the Esperanza Formation of J3ox K1ne age, constituted by a sequence of terrigenous sediments and carbonates (schistose limestones, calcareous sandstones, black shales, argillites and siltstones) and concordant bodies of diabases and gabbro-diabases representative of submarine tholeiitic rift magmatism. Basic volcanic rocks were analyzed by petrographic analysis and quench textures in pyroxenes and plagioclases were identified for the first time. The plagioclases show swallow-tail, feathery and rosette morphologies while the pyroxenes have a feathery and herringbone habit. Much of these textures are identical to those reported in submarine basalts, lunar basalts, rocks with spinifex texture and experimentally produced textures. According to the recognized types of quench textures, it is inferred that crystallization occurred in submarine conditions with high supercooling rates, in the order of 32-66ºC/h in a range of temperature rates (ΔT) between 150-300ºC.
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