Platinum group element ,mineralisation in the Munni Munni Complex, western Australia

Autor:	J. Barnes, J. R. McIntyre, B. W. Nisbet, C. R. Williams
Rok vydání:	1990
Předmět:	geography geography.geographical_feature_category Archean Geochemistry engineering.material Platinum group Closed chamber Geophysics Volcano Geochemistry and Petrology Ultramafic rock Pigeonite engineering Plagioclase Layering Geology
Zdroj:	Mineralogy and Petrology. 42:141-164
ISSN:	1438-1168 0930-0708
DOI:	10.1007/bf01162688
Popis:	The late Archaean Munni Munni Complex occupies an elliptical area of 9 by 25 km, the southern half of which is covered unconformably by a 2.7 Ga volcanic sequence. The Complex consists of a lower 1850 m thick Ultramafic Series (UMS) and an upper Gabbroic Series (GS) at least 3600 m thick, and is in the form of an elongate funnel. The UMS is made up of macrorhythmic cycles of dunite, wehrlite and clinopyroxenite, while the GS shows an uninterrupted fractionation trend from pigeonite gabbros through pigeonite-magnetite gabbros to granophyres. The base of the GS is very sharp, and marked by simultaneous appearance of cumulus plagioclase and pigeonite. GS cumulates show a monotonous upward increase in Fe/Mg and an absence of cyclic layering, indicating crystallization in a closed chamber.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4e831a13fd157331d128936ecde9cd51 https://doi.org/10.1007/bf01162688 Zobrazit plný text záznamu Full text from SpringerLink