Earliest planetary melting; the view from meteorites

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doi: 10.1016/0377-0273(92)90033-A
Authors:Hutchison, Robert
Author Affiliations:Primary:
Natural History Museum, Mineralogy Department, London, United Kingdom
University of Leeds, United Kingdom
Volume Title:Essays on magmas and other earth fluids; a volume in appreciation of Prof. Peter G. Harris
Volume Authors:Cox, K. G., editor; Baker, P. E.
Source:Essays on magmas and other earth fluids; a volume in appreciation of Prof. Peter G. Harris, edited by K. G. Cox and P. E. Baker. Journal of Volcanology and Geothermal Research, 50(1-2), p.7-16. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-0273
Publication Date:1992
Note:In English. 30 refs.; illus.
Summary:The eucrite meteorites and iron meteorites from the cores of asteroids have ages that testify to planetary formation and differentiation 4550-4600 m.y. ago. These ages are indistinguishable from those of the ordinary chondrites, mixtures of silicate, sulphide and metal that did not melt after their formation. Rare inclusions in the ordinary chondrites have textures and/or fractionated REE patterns indicating that they are the products of basaltic melts. Thus, some basaltic rocks predate the accretion of the ordinary chondrites. Four inclusions are briefly described. One contains evidence for the former presence of 'live' 26Al; another exhibits an ophitic texture, extreme Fe enrichment in the pyroxenes and an abnormally high MnO/FeO ratio. This inclusion is from a differentiated body of which no other sample has been identified. [R.E.S.]
Subjects:Achondrites; Chondrites; Differentiation; Eucrite; Geochemistry; Inclusions; Mantle; Melting; Meteorites; Stony meteorites; Upper mantle; Volcanism
Abstract Numbers:93M/910
Record ID:1996025109
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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