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Tectonic settings of VMS deposits
NHM.
Laurentian University.
Franklin Geoscience.
CODES.
Show others and affiliations
2008 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

Modern and ancient volcanogenic or volcanic-hosted (VMS or VHMS deposits) have been usefully divided into five broad lithostratigraphic groups: 1) Bimodal-mafic; 2) Mafic; 3) Pelitic-mafic; 4) Bimodal-felsic and 5) Siliciclastic-felsic. This classification relates to the entire volcano-sedimentary cycle or assemblage within a district, using principles of sequence stratigraphy, not only the type of immediate host or footwall. Such a classification avoids using straight empirical metal ratios or more parochial nomenclature based on deposit-scale features but by necessity provides only broad models for the definition of sub-types.The tectonic settings of many VMS deposits are well defined, and classic examples are found forming at modern spreading ridges, which includes oceanic ridges, thickened oceanic crust and sedimented oceanic ridges and continental margin rifts. Modern arcs are also host to VMS deposits and due to problems of preserving spreading ridges in the geological record, it is the rifted arc settings that provide the best examples of the deposit type in the ancient record such as; nascent arcs - ophiolites; primitive volcanic arcs; complex oceanic arcs and mature volcanic arcs. The five lithostratigraphic groups can be linked to many of these tectonic settings directly although there are some important VMS camps where the broad criteria fit specific lithostratigraphic settings (e.g. Mt Read, Tasmania; Iberian Pyrite Belt) in Bimodal Felsic and Siliciclastic Felsic settings respectively) but that the literature suggests that a simple supra-subduction arc setting is not appropriate for either case. These types of tectonic settings are probably unknown in the modern crust and thus it follows that some of the potential settings for VMS deposits found in the geological record may not have a modern analogue.In this paper wesuggest that whilst strict definition of tectonic settings for each lithostratigraphic group of VMS deposits may not be possible, very specific lithogeochemical signatures of volcanic rocks relate to each of the settings. These rock types are all indicative of high-temperature melting and extension for each of the specific lithostratigraphic associations. Other work suggests that these specific magma types may be forming in a less proscriptive range of tectonic settings to that previously recorded and are simply indicative of a special set of rifting or arc to rifting conditions. This further suggests that VMS deposits may form in settings outside the normal spreading ridges and arcs and that we may able to extend the range of tectonic settings for the formation of VMS deposits accordingly. Following on from this, the recognition of some of these critical lithogeochemical magma types in tectonic settings previously considered less favourable for VMS deposits may lead to the discovery of new prospective belts.

Place, publisher, year, edition, pages
2008.
National Category
Geology
Research subject
Ore Geology
Identifiers
URN: urn:nbn:se:uu:diva-327780Local ID: 3ca209a0-6f97-11dd-8151-000ea68e967bOAI: oai:DiVA.org:uu-327780DiVA: diva2:1131043
Conference
International Geological Congress : 06/08/2008 - 14/08/2008
Note

Godkänd; 2008; 20080821 (pawe)

Available from: 2016-09-30 Created: 2017-08-11

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