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- W50423620 abstract "The Iberian Pyrite Belt is the richest massive sulfide province in the world. The massive sulfideore deposits occur in a felsic volcanic and sedimentary succession (VS Complex) of lateFamennian (Upper Devonian) to late Visean (Middle Carboniferous) age. Volcanic faciesanalysis has been carried out on three areas in Portugal, including the Neves Corvo mine, andfive sections in Spain. In all sections studied, the depositional setting during accumulation of theVS Complex was submarine and below wave base.The principal felsic volcanic facies are: (1) coherent rhyolite and dacite, associated withmonomictic breccia; (2) fiamme-rich breccia (with variable amounts of dense volcanic andsedimentary clasts), fiamme-rich sandstone and fiamme-bearing mudstone; and (3) crystal-richsandstone and mudstone. Mafic units are minor, dominated by coherent facies and haveuncertain mode of emplacement (intrusions or lavas). Fiamme typically have lenticular shapeand quartz- or quartz- and feldspar-phyric texture, and are interpreted to be altered andcompacted pumice clasts. The volcanic facies are typically interleaved with, and regionally lessvoluminous than, the non-volcanic facies, which are dominated by mudstone.The felsic volcanic facies are interpreted to be the products of numerous, relatively smallintrabasinal volcanic centres that generated abundant lavas, domes and pyroclastic units. Somevolcanic centres are dominated by lavas, whereas others have similar proportions of lavas andpyroclastic units. The domes and lavas are more voluminous but less laterally extensive than thepyroclastic units. A sediment-matrix breccia typically occurs at the top contact of the felsiclavas with sedimentary units. This sediment-matrix breccia formed from the infiltration of finesediment into interclast spaces in previously formed hyaloclastite, and could be misinterpretedas peperite. Felsic intrusions are less voluminous than lavas, and were emplaced as cryptodomesand partly extrusive cryptodomes, late in the evolution of the VS Complex. The architecture ofthe different study areas reflects differences in the eruption style, emplacement processes andproximity to source. Parts of the succession interpreted to be proximal are dominated by thicklavas/domes and intrusions, and coarse pyroclastic deposits. Medial parts compriseresedimented autoclastic facies derived from the lavas and domes, and relatively thin pyroclasticunits. Distal parts comprise relatively thinly bedded crystal-rich sandstone and siliceousmudstone. Regional correlations in the VS Complex are impossible, as none of the volcanicfacies are regionally extensive and each of the volcanic centres has a unique internalarchitecture.At Neves Corvo mine, the massive sulfide ore deposits are close to one of the felsic volcaniccentre(s), occurring immediately above the rhyolitic lavas/domes.IV" @default.
- W50423620 created "2016-06-24" @default.
- W50423620 creator A5014009996 @default.
- W50423620 date "2007-01-01" @default.
- W50423620 modified "2023-09-27" @default.
- W50423620 title "Facies Architecture of the Volcanic Sedimentary Complex of the Iberian Pyrite Belt, Portugal and Spain" @default.
- W50423620 hasPublicationYear "2007" @default.
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