Volcanogenic massive sulfide occurrence model: chapter C of mineral deposit models for resource assessment

Medientyp: E-Book

Titel: Volcanogenic massive sulfide occurrence model : chapter C of mineral deposit models for resource assessment

Beteiligte: Shanks, Wayne C. [Hrsg.]

Körperschaft: United States Geological Survey

Erschienen: Reston, Va: U.S. Dept. of the Interior, U.S. Geological Survey, 2012

Umfang: Online-Ressource

Sprache: Englisch

Schlagwörter: VHMS-Lagerstätte > Sedimentär-exhalative Lagerstätte > Geologie > Mineralisation > Lagerstättenkunde
Erzlagerstätte > Stratiforme Lagerstätte > Sulfidlagerstätte > Metallogenese
Bleilagerstätte > Silberlagerstätte > Zinklagerstätte > Kupferlagerstätte > Goldlagerstätte > Prospektion

Entstehung:

Anmerkungen: 1. Introduction -- 2. Deposit type and associated commodities -- 3. Historical evolution of descriptive and genetic knowledge and concepts -- 4. Regional environment -- 5. Physical volcanology of volcanogenic massive sulfide deposits -- 6. Physical description of deposit -- 7. Geophysical characteristics of volcanogenic massive sulfide deposits -- 8. Hypogene ore characteristics -- 9. Hypogene gangue characteristics -- 10. Exhalites -- 11. Hydrothermal alteration -- 12. Supergene ore and gangue characteristics -- 13. Weathering processes -- 14. Geochemical characteristics -- 15. Petrology of associated igneous rocks -- 16. Petrology of sedimentary rocks associated with volcanogenic massive sulfide deposits -- 17. Petrology of metamorphic rocks associated with volcanogenic massive sulfide deposits -- 18. Theory of deposit formation -- 19. Exploration-resource assessment guides -- 20. Geoenvironmental features -- 21. Knowledge gaps and future research directions

Beschreibung: Volcanogenic massive sulfide (VMS) deposits, also known as volcanic-hosted massive sulfide, volcanic-associated massive sulfide, or seafloor massive sulfide deposits, are important sources of copper, zinc, lead, gold, and silver (Cu, Zn, Pb, Au, and Ag). These deposits form at or near the seafloor where circulating hydrothermal fluids driven by magmatic heat are quenched through mixing with bottom waters or porewaters in near-seafloor lithologies. Massive sulfide lenses vary widely in shape and size and may be podlike or sheetlike. They are generally stratiform and may occur as multiple lenses. Volcanogenic massive sulfide deposits range in size from small pods of less than a ton (which are commonly scattered through prospective terrains) to supergiant accumulations like Rio Tinto (Spain), 1.5 Bt (billion metric tons); Kholodrina (Russia), 300 Mt (million metric tons); Windy Craggy (Canada), 300 Mt; Brunswick No. 12 (Canada), 230 Mt; and Ducktown (United States), 163 Mt (Galley and others, 2007). Volcanogenic massive sulfide deposits range in age from 3.55 Ga (billion years) to zero-age deposits that are actively forming in extensional settings on the seafloor, especially mid-ocean ridges, island arcs, and back-arc spreading basins (Shanks, 2001; Hannington and others, 2005). The widespread recognition of modern seafloor VMS deposits and associated hydrothermal vent fluids and vent fauna has been one of the most astonishing discoveries in the last 50 years, and seafloor exploration and scientific studies have contributed much to our understanding of ore-forming processes and the tectonic framework for VMS deposits in the marine environment. Massive ore in VMS deposits consists of>40 percent sulfides, usually pyrite, pyrrhotite, chalcopyrite, sphalerite, and galena; non-sulfide gangue typically consists of quartz, barite, anhydrite, iron (Fe) oxides, chlorite, sericite, talc, and their metamorphosed equivalents. Ore composition may be Pb-Zn-, Cu-Zn-, or Pb-Cu-Zn-dominated, and some deposits are zoned vertically and laterally. Many deposits have stringer or feeder zones beneath the massive zone that consist of crosscutting veins and veinlets of sulfides in a matrix of pervasively altered host rock and gangue. Alteration zonation in the host rocks surrounding the deposits are usually well-developed and include advanced argillic (kaolinite, alunite), argillic (illite, sericite), sericitic (sericite, quartz), chloritic (chlorite, quartz), and propylitic (carbonate, epidote, chlorite) types (Bonnet and Corriveau, 2007). An unusual feature of VMS deposits is the common association of stratiform "exhalative" deposits precipitated from hydrothermal fluids emanating into bottom waters. These deposits may extend well beyond the margins of massive sulfide and are typically composed of silica, iron, and manganese oxides, carbonates, sulfates, sulfides, and tourmaline

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