The Grand Brule Exploration Drilling- New Data On The Deep Framework Of The Piton De La Fournaise Volcano, Part 3- Mineral Chemistry Of The Cumulate Rocks

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Journal Article: The Grand Brule Exploration Drilling- New Data On The Deep Framework Of The Piton De La Fournaise Volcano, Part 3- Mineral Chemistry Of The Cumulate Rocks

Abstract
Dunites at the base of the Grand Brule intrusive body are deformed cumulates with olivine (Fo84.5-Fo87.3) containing exsolution lamellae of spinel, discrete grains of chrome spinel enriched in titanium, with a high Fe3+/Fe2+ ratio and interstitial chrome diopside. A complex assemblage of silicate inclusions (pargasite, orthopyroxene, nepheline, albite, jadeite) has been found in these spinels. The mineral composition of wehrlite and gabbro overlaps that of dunite, with olivine (Fo76.9-Fo85.6), chrome spinel with up to 25 wt.% Fe2O3, chrome diopside and plagiocalse (An53.4-An80.6). These cumulates are interpreted as the result of fractional crystallization in a frequently replenished magma chamber. However, this chamber does not seem to be related to the present Piton de la Fournaise structure and is interpreted as part of an older, proto-Fournaise, volcanic edifice. Peridotitic and gabbroic nodules found in lavas from the Piton de la Fournaise and Piton des Neiges volcanoes are probably derived from similar bodies.

Authors 
Thierry Auge, Patrice Lerebour and Jean-Philippe Rancon








Published Journal 
Journal of Volcanology and Geothermal Research, 1989





DOI 
Not Provided
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Citation

Thierry Auge,Patrice Lerebour,Jean-Philippe Rancon. 1989. The Grand Brule Exploration Drilling- New Data On The Deep Framework Of The Piton De La Fournaise Volcano, Part 3- Mineral Chemistry Of The Cumulate Rocks. Journal of Volcanology and Geothermal Research. (!) .