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Phanerozoic volcanism

Kerr, Andrew Craig and Menzies, M. A. 2012. Phanerozoic volcanism. In: Roberts, D. G. and Bally, A. W. eds. Regional Geology and Tectonics: Principles of Geologic Analysis, Amsterdam: Elsevier, pp. 40-74. (10.1016/B978-0-444-53042-4.00002-9)

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Abstract

Oceanic volcanism can be understood in terms of decompression melting (ridges), addition of water to dry mantle (arcs) and possible involvement of high temperature mantle (ocean islands and plateaux). Continental volcanism involves these melting regimes with the added complexity of lithosphere age (0–4500 Ma), thickness (≤200 km) and chemistry (refractory to fertile). Continental rifts may comprise basaltic, potassic and/or rhyolitic magmas dependent on the extent of involvement of sub-lithospheric mantle, lithospheric mantle and crust, respectively. The latter might involve establishment of high-level magma chambers with attendant fractionation and/or contamination. Continental flood basalts or large igneous provinces (LIPs) are spatially associated, in most cases, with volcanic rifted margins. However, controversy surrounds the source of voluminous basaltic magma, the relationship between magmatism and extension and the nature of the pre- to syn-rift transition.

Item Type: Book Section
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Uncontrolled Keywords: basalt, lithosphere, magma, mantle plume, subduction zone, mid-ocean ridge, mantle, large igneous provinces, black shale, ocean anoxia
Publisher: Elsevier
ISBN: 9780444530424
Related URLs:
Last Modified: 04 Jun 2017 04:04
URI: http://orca.cf.ac.uk/id/eprint/32287

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