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Clay minerals in basalt-hawaiite rocks from mururoa atoll (French polynesia). I. mineralogy
Mas, Antoine (University of Poitiers)
Meunier, Alain (University of Poitiers)
Beaufort, Daniel (University of Poitiers)
Patrier, Patricia (University of Poitiers)
Dudoignon, Patrick (University of Poitiers)

Date: 2008
Abstract: Clay minerals in chilled or brecciated margins (altered glass) and massive inner crystalline parts (mesostasis) of three basalt-hawaiite bodies from Mururoa Atoll (French Polynesia) have been studied in order to compare their chemical and mineralogical compositions. Polyphase assemblages comprise di- and trioctahedral phases, both of which consist of non-expandable layers (chlorite, celadonite) and two types of expandable layers (saponite and Fe-rich smectite or 'nontronite-like' material). The presence of the Fe-rich clays is supported by the presence of the X-ray diffraction 060 peak at 1. 51-1. 52 Å and of the infrared absorption bands at 875 and 822 cm (Fe-Al-OH and Fe-Fe-OH groups, respectively). The chemical composition of the Fe-rich smectites does not fit with the theoretical nontronite field. The layer charge averages 1 per SiO making these Fe-rich smectites close to 'celadonite-type' clays. This could explain the presence of mixed-layer celadonite-smectite. Plotted in an M/4Si vs. Fe/sum octahedral cations diagram, the chemical compositions of clay minerals in the mesostasis form a continuous field limited by the celadonite high-charge nontronite-like smectite and chlorite end-members. The clay assemblages are different from those formed in hydrothermal systems or low-grade metamorphic conditions which are characterized by the sequence: saponite → randomly ordered chlorite-smectite mixed-layered minerals (MLMs)→ corrensite → chlorite. The systematic presence of Ferich clays either in the altered chilled margins or in the massive inner parts of the basalt-hawaiite bodies (high-charge nontronite-like smectite and mixed-layer nontronite-celadonite) makes the Mururoa seamount a potential terrestrial analogue for Mars surface exploration.
Rights: Tots els drets reservats.
Language: Anglès
Document: Article ; recerca ; Versió publicada
Subject: Basalt ; C-S ; Celadonite ; French Polynesia ; Glass ; Mesostasis ; Mururoa ; Nontronite ; Vesicle
Published in: Clays and Clay Minerals, Vol. 56, Núm. 6 (2008) , p. 711-729, ISSN 1552-8367

DOI: 10.1346/CCMN.2008.0560611


19 p, 3.4 MB
 UAB restricted access

The record appears in these collections:
Articles > Research articles
Articles > Published articles

 Record created 2020-06-10, last modified 2023-06-03



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