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Volcanic successions associated with ore deposits: facies characteristics and ore-host relationships
Citation
McPhie, J and Cas, R, Volcanic successions associated with ore deposits: facies characteristics and ore-host relationships, The Encyclopedia of Volcanoes, Academic Press Ltd, H Sigurdsson, B Houghton, H Rymer, J Stix, S McNutt (ed), London, pp. 865-879. ISBN 9780123859389 (2015) [Other Book Chapter]
Copyright Statement
Copyright 2015 Elsevier Inc
DOI: doi:10.1016/B978-0-12-385938-9.00049-3
Abstract
Four important ore deposits are commonly hosted in volcanic
successions: volcanic-hosted massive sulfide
(VHMS) deposits, komatiite-hosted nickel sulfide deposits,
epithermal gold silver deposits, and kimberlite-hosted
diamonds. There are different reasons why these ore deposit
types occur in volcanic successions. The occurrence
of VHMS deposits and komatiite-hosted nickel sulfide
deposits in volcanic rocks reflects the strong genetic
connection between the volcanism and the ore-forming
processes. Such a connection may also link epithermal
gold silver deposits with contemporaneous volcanism,
both being products of high heat flow and extension.
However, the connection does not always exist for epithermal
gold silver deposits because some of these deposits
are significantly younger than the host volcanic
succession, or the host succession is not volcanic. In the
case of kimberlite-hosted diamonds, kimberlite magmas
serve as the medium for transporting diamonds from the
mantle to the Earth's surface; the diamonds are not generated
by the host kimberlite magmas nor by the processes
that produced those magmas. A fifth important ore deposit
type, porphyry copper gold molybdenum deposits, typically
occurs in volcanic arcs and may be hosted by volcanic
successions. However, the magmatic-hydrothermal processes
that produce these deposits operate exclusively
subsurface, and venting of either the fluids or the magmas
reduces the metal potential of the system (Pasteris, 1996).
Hence, in general, there is no systematic relationship between
porphyry deposits and volcanism even in cases
where the host succession is volcanic or partly volcanic.
Item Details
| Item Type: | Other Book Chapter |
|---|---|
| Keywords: | volcano, hydrothermal, VHMS, epithermal, komatiite, diamond |
| Research Division: | Earth Sciences |
| Research Group: | Geology |
| Research Field: | Volcanology |
| Objective Division: | Expanding Knowledge |
| Objective Group: | Expanding knowledge |
| Objective Field: | Expanding knowledge in the earth sciences |
| UTAS Author: | McPhie, J (Professor Jocelyn McPhie) |
| UTAS Author: | Cas, R (Professor Ray Cas) |
| ID Code: | 105879 |
| Year Published: | 2015 |
| Funding Support: | Australian Research Council (CE0561595) |
| Deposited By: | IMAS Research and Education Centre |
| Deposited On: | 2016-01-18 |
| Last Modified: | 2016-08-08 |
| Downloads: | 2 View Download Statistics |
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