GEOSCAN, résultats de la recherche


TitreZinc-rich volcanogenic massive sulphide (VMS) deposits
AuteurPiercey, S J; Peter, J M; Goodfellow, W D; Herrington, R M
SourceProceedings of the Seventh International Conference on Materials Engineering for Resources (ICMR 2013); par Irish Association for Economic Geology; 2013.
Séries alt.Secteur des sciences de la Terre, Contribution externe 20140448
RéunionSeventh International Conference on Materials Engineering for Resources (ICMR 2013); Akita City; JP; Novembre 20-22, 2013
Medianumérique; en ligne
Sujetsgîtes volcanogènes; gîtes sulfureux; zinc; métallogénie; genèse des minerais; gisements minéraux; milieu sédimentaire; minéraux métalliques
ProgrammeÉtude des gîtes de sulfures massifs volcaniques, Initiative géoscientifique ciblée (IGC-4)
Résumé(disponible en anglais seulement)
Volcanogenic massive sulphide (VMS) deposits are important contributors to global Zn resources. There are zinc-rich VMS deposits (defined here as >1 Mt contained Zn) in many of the VMS deposit sub-classes, but they are primarily hosted by felsic volcanic (e.g., bimodal mafic, bimodal felsic, and felsic siliciclastic types) and sedimentary (i.e., felsic siliciclastic and to a lesser extent mafic siliciclastic types) rocks. Although Zn-rich VMS deposits have formed throughout geological time, the contained Zn in these deposits is clustered in distinct peaks in the late Archean, Paleoproterozoic, late Cambrian-early Ordovician, and late Devonian-early Mississippian, and late Triassic. The key features that appear to result in the formation of Zn-rich (i.e., high grade and/or large tonnage) VMS deposits include: 1) optimal geodynamic setting (i.e., rifts, high-temperature magmatism, coincidence with crustal growth or plate reorganization); 2) associated with sediments and sediment-rich basins; 3) substantial subseafloor replacement; 4) local to global anoxia; 5) welldeveloped cap rocks; 6) anomalously high fluid salinities; and 7) caldera formational setting. These features are not universally present in all Zn-rich VMS systems, but most Zn-rich VMS systems contain a number of these features.