The Grand Brule Exploration Drilling- New Data On The Deep Framework Of The Piton De La Fournaise Volcano, Part 2- Secondary Minerals

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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 2- Secondary Minerals

Abstract
The Grand Brule borehole intersects a thick pile of basaltic lavas, down to 1010 m, and a basic-ultrabasic intrusive complex, from 1010 to 3003.50 m. The lavas are, in general, unaltered except in two fractured zones, where hydrothermal fluids circulated at temperatures not exceeding 350°C. The main secondary minerals there are pyroxene, feldspar, epidote, actinolite and chlorite. The entire thickness of the intrusive body intersected contains secondary minerals representing three stages of cooling: 1. 1. A late magmatic episode (600-900°C) characterized by biotite, kaersutite, edenite and pargasite. 2. 2. A hydrothermal episode (T<- 350°C) characterized by epidote, albite, biotite, actinolite and chlorite. 3. 3. A phase of serpentinization (T<= 350°C). It is very likely that the two later events occurred simultaneously, with physical and chemical interference.

Authors 
Patrice Lerebour, J. Philippe Rancon and Thierry Auge








Published Journal 
Journal of Volcanology and Geothermal Research, 1989





DOI 
Not Provided
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Citation

Patrice Lerebour,J. Philippe Rancon,Thierry Auge. 1989. The Grand Brule Exploration Drilling- New Data On The Deep Framework Of The Piton De La Fournaise Volcano, Part 2- Secondary Minerals. Journal of Volcanology and Geothermal Research. (!) .