Horizon / Plein textes La base de ressources documentaires de l'IRD

IRD

 

Publications des scientifiques de l'IRD

Lagabrielle Y., Ruellan E., Tanahashi M., Bourgois J., Buffet G., Alteriis G. de, Dyment J., Goslin J., Gracia-Mont E., Iwabushi Y., Jarvis P., Joshima M., Karpoff A.M., Matsumoto T., Ondréas H., Pelletier Bernard, Sardou O. (1996). Active oceanic spreading in the northern north Fiji basin : results of the NOFI cruise of R/V l'Atalante (Newstarmer project). Marine Geophysical Researches, 18, 225-247. Seafloor Mapping in the West and Southwest Pacific : Results and Applications, Nouméa (NCL), 1994/11/4-9. ISSN 0025-3235

Fichier PDF disponiblehttp://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_45-46/010009462.pdf[ PDF Link ]

Lien direct chez l'éditeur doi:10.1007/BF00286079

Titre
Active oceanic spreading in the northern north Fiji basin : results of the NOFI cruise of R/V l'Atalante (Newstarmer project)
Année de publication1996
Type de documentArticle
AuteursLagabrielle Y., Ruellan E., Tanahashi M., Bourgois J., Buffet G., Alteriis G. de, Dyment J., Goslin J., Gracia-Mont E., Iwabushi Y., Jarvis P., Joshima M., Karpoff A.M., Matsumoto T., Ondréas H., Pelletier Bernard, Sardou O.
SourceMarine Geophysical Researches, 1996, 18, p. 225-247. ISSN 0025-3235
ColloqueSeafloor Mapping in the West and Southwest Pacific : Results and Applications, Nouméa (NCL), 1994/11/4-9
RésuméThe South Pandora and the Tripartite Ridges are active spreading centers located in the northern part of the North Fiji Basin. These spreading centers were surveyed over a distance of 750 km during the NOFI cruise of R/V L'Atalante (August-September 1994) which was conducted in the frame of the french-japanese Newstarmer cooperation project. SIMRAD EM12-dual full coverage swath bathymetric and imagery data as well as airgun 6-channel seismic, magnetics and gravity profiles were recorded along an off-axis from 170°40'E to 178°E. Dredging and piston coring were also performed along and off-axis. The axial domain of the South Pandora Ridge is divided into 5 first-order segments characterized by contrasted morphologies. The average width of the active domain is 20 km and corresponds either to bathymetric highs or to deep elongated grabens. The bathymetric highs are volcanic constructions, locally faulted and rifted, which can obstruct totally the axial valley. The grabens show the typical morphology of slow spreading axes, with two steep walls flanking a deep axial valley. Elongated lateral ridges may be present on both sides of the grabens. Numerous volcanoes, up to several kilometers in diameter, occur on both flanks of the South Pandora Ridge. The Tripartite Ridge consists of three main segments showing a sigmoid shape. Major changes in the direction of the active zones are observed at the segment discontinuities. These discontinuities show various geometrical patterns which suggest complex transform relay zones. Preliminary analysis of seismic reflection profiles suggest that the Tripartite Ridge is a very young feature which propagates into an older oceanic domain characterized by a significant sedimentary cover. By contrast, a very thin to absent sedimentary cover is observed about 100 km on both flanks of the South Pandora Ridge active axis. The magnetic anomaly profiles give evidence of long and continuous lineations, parallel to the South Pandora Ridge spreading axis. (Résumé d'auteur)
Plan de classementTectonique [064TECTO]
DescripteursTECTONIQUE DE PLAQUES ; EXTENSION TECTONIQUE ; GEOLOGIE STRUCTURALE ; BATHYMETRIE ; MAGNETISME ; GRAVIMETRIE ; GEODYNAMIQUE
LocalisationFonds IRD [F B010009462]
Identifiant IRDfdi:010009462
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010009462

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL


* PDF Link :

    à télécharger pour citer/partager ce document sur les réseaux sociaux académiques


Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Cayenne

Nouméa

Papeete

Abidjan

Dakar

Niamey

Ouagadougou

Tunis

La Paz

Quito