Picrite from the Katse area, Lesotho: evidence for flow differentiation

Autor:	A.E. Schoch, C.A. Myburgh, W.A. van der Westhuizen, H. de Bruiyn
Rok vydání:	2000
Předmět:	Olivine Lava Earth science Flow (psychology) Geology engineering.material Picrite basalt Flow velocity Magma engineering Compositional variation Petrology Earth-Surface Processes Melt inclusions
Zdroj:	Journal of African Earth Sciences. 31:657-668
ISSN:	1464-343X
DOI:	10.1016/s0899-5362(00)80013-5
Popis:	A basalt flow in the Katse area of Lesotho displays composite features with tholeiitic characteristics along its margins and a picritic composition in the centre. Geochemical modelling of the magma and the composition of microscopic melt inclusions indicate that the primary magma was olivine-rich. The chemical variation of the flow is evidence for fractionation of olivine from the magma, causing a trend towards tholeiitic compositions. The derived lava flow was modified by flow differentiation so that olivine concentrated progressively towards the centre, owing to differential flow velocity. Evidence from geochemical modelling corroborates these conclusions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ad07774a11a7e0b2ce007e8b21abaea1 https://doi.org/10.1016/s0899-5362(00)80013-5 Zobrazit plný text záznamu Full Text from ScienceDirect