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Occurrence of thaumasite in a seawater-basalt interaction, mururoa atoll (French Polynesia, South Pacific)

Published online by Cambridge University Press:  05 July 2018

Y. Noack*
Affiliation:
Lab. de Pétrologie de la Surface, 40 Avenue du Recteur Pineau, 86022 Poitiers Cédex, France

Abstract

The first occurrence of thaumasite resulting from seawater-basalt interaction has been discovered in a drill hole on Mururoa atoll (French Polynesia, South Pacific). This sulphate-carbonate-silicate is associated with zeolites (phillipsite, chabazite, gmelinite), apophyllite, analcime, and gyrolite. In this environment thaumasite can be considered as the last mineral of an alteration sequence. It crystallized from a Ca-SO3-CO2-rich and Al-Na-K-poor fluid. The temperature of this solution is unknown, but was probably not greater than 100°C.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1983

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