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DIGITAL.CSIC
Article . 2008 . Peer-reviewed
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Motukoreaita, Filipsita y Calcita: una Secuencia de Alteración Submarina en Basaltos en el margen Sur-Balear

Authors: ZAMARREÑO, Isabel; PLANA, F.; VAZQUEZ, Antonio;

Motukoreaita, Filipsita y Calcita: una Secuencia de Alteración Submarina en Basaltos en el margen Sur-Balear

Abstract

[EN] Olivine basalt hyaloclastites dredged from the Emile Baudot Bank in the southern margin of Balearic Islands show several alteration minerals. The principal secondary mineral assemblages are motukoreaite, phillipsite and calcite. The three main components occur infilling fractures, vugs, vesicles and as spherulitic textures. In cavities having the three mineral phases the precipitation sequence was found to be motukoreaite, phillipsite and calcite. Motukoreaite, the first phase to form, is the most abundant, and was identified by X-ray diffractometry, scanning electron microscopy and energy dispersive analysis. Worldwide this is the third occurrence of motukoreaite reported in the literature. Phillipsite is the second mineral in the sequence and generally occurs before calcite. Calcite appear late in the alteration sequence infilling the centers of cavities. Contacts between the three mineral phases are sharp, lacking any gradational zone. The secondary mineral assemblages originated by low temperature alteration of olivine basalts during the initial stages of basalt cooling in contact with sea water

[ES] El estudio mineralógico y petrográfico de las muestras de basaltos olivínicos dragados en el Banco de Emile Baudot, al SE de Ibiza, revelan la existencia de las siguientes fases minerales de alteración: motukoreaita, filipsita y calcita. Estos minerales secundarios constituyen el relleno de fracturas, oquedades y vesículas. Cuando las tres fases minerales están presentes, la secuencia de precipitación es: primero motukoreaita, seguida de filipsita y finalmente calcita. La motukoreaita constituye el mineral mas abundante y ha sido identificada mediante análisis por difracción de rayos X, microscopio electrónico de barrido y energía dispersivz. El hallazgo de motukoreaita es de gran relevancia puesto que únicamente se conocía su existencia en dos localidades en todo el mundo. La paragénesis de los minerales secundarios corresponde a una alteración o diagénesis submarina a baja temperatura

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Spain
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Keywords

Mediterráneo occidental, Banco Emile Baudot, Motukoreaita, Alteración basaltos, Filipsita

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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
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