EdenteV2, Main, Exploration, bibRecord, 009837

Découverte d'un système hydrothermal océanique fossile dans l'ophiolite antécambrienne de Khzama (massif du Siroua, Anti-Atlas marocain)

Identifieur interne : 009837 ( Main/Exploration ); précédent : 009836; suivant : 009838

Découverte d'un système hydrothermal océanique fossile dans l'ophiolite antécambrienne de Khzama (massif du Siroua, Anti-Atlas marocain)

Auteurs : Hassan Admou [Maroc] ; Thierry Juteau [France]

Source :

Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science [ 1251-8050 ] ; 1998.

RBID : ISTEX:D235AF63168D5CFEF5251C440F4AA4A7E285F4DA

Descripteurs français

Wicri :
- geographic : Maroc, Maroc.

English descriptors

KwdEn :
- Anti-Atlas, Maroc, Morocco, Precambrian, Précambrien, complexe filonien, dyke complex, hydrothermalisme océanique, oceanic hydrothermalism, ophiolites.

Abstract

Abstract: The Khzama Precambrian ophiolite, tectonized and metamorphosed, exhibits all the lithological units of a complete ophiolite suite. The dyke complex, studied in detail in three tectonic slices, consists of isotropic to laminated, sometimes banded gabbros (about 50 %), crosscut by swarms of isolated diabase dykes with systematic chilled margins (about 50 %). This dyke complex unit shows a remarkably preserved network of fossil hydrothermal veins, consisting of quartz-epidote-sulfides associations, mostly oriented parallel to the margins of the diabase dykes. Greenish epidosites form veins and pockets, around which the diabases are impregnated with still fresh and shining sulfides, disseminated in the dykes' groundmass. These characteristics are identical to those described in fossil hydrothermal systems of much younger ophiolites, such as the cretaceous ophiolites of Oman or Cyprus, in the lower part of the sheeted dyke complex. The Khzama fossil hydrothermal system could constitute one of the most ancient oceanic hydrothermal systems developed at an oceanic spreading centre.

Url:

https://api.istex.fr/document/D235AF63168D5CFEF5251C440F4AA4A7E285F4DA/fulltext/pdf

DOI: 10.1016/S1251-8050(98)80052-9

Affiliations:

Links toward previous steps (curation, corpus...)

to stream Istex, to step Corpus: 006850
to stream Istex, to step Curation: 006850
to stream Istex, to step Checkpoint: 004494
to stream Main, to step Merge: 009D02
to stream Main, to step Curation: 009837

Le document en format XML

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<front><div type="abstract" xml:lang="en">Abstract: The Khzama Precambrian ophiolite, tectonized and metamorphosed, exhibits all the lithological units of a complete ophiolite suite. The dyke complex, studied in detail in three tectonic slices, consists of isotropic to laminated, sometimes banded gabbros (about 50 %), crosscut by swarms of isolated diabase dykes with systematic chilled margins (about 50 %). This dyke complex unit shows a remarkably preserved network of fossil hydrothermal veins, consisting of quartz-epidote-sulfides associations, mostly oriented parallel to the margins of the diabase dykes. Greenish epidosites form veins and pockets, around which the diabases are impregnated with still fresh and shining sulfides, disseminated in the dykes' groundmass. These characteristics are identical to those described in fossil hydrothermal systems of much younger ophiolites, such as the cretaceous ophiolites of Oman or Cyprus, in the lower part of the sheeted dyke complex. The Khzama fossil hydrothermal system could constitute one of the most ancient oceanic hydrothermal systems developed at an oceanic spreading centre.</div>
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Découverte d'un système hydrothermal océanique fossile dans l'ophiolite antécambrienne de Khzama (massif du Siroua, Anti-Atlas marocain)

Découverte d'un système hydrothermal océanique fossile dans l'ophiolite antécambrienne de Khzama (massif du Siroua, Anti-Atlas marocain)

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri