Géochimie isotopique des basaltes de la ride médio-océanique de l'Atlantique Equatorial

Fontignie, Denis André; Schilling, Jean-Guy; Hanan, B.B.

doi:10.5169/seals-54901

Scientific article

Open access

French

Géochimie isotopique des basaltes de la ride médio-océanique de l'Atlantique Equatorial

Other titleIsotope geochemistry of mid ocean ridge basalts of the equatorial Atlantic

ContributorsFontignie, Denis André; Schilling, Jean-Guy; Hanan, B.B.

Published inSchweizerische mineralogische und petrographische Mitteilungen, vol. 72, no. 1, p. 123-127

Publication date1992

Abstract

A major, 1000-km long geochemical anomaly culminating at 1.7°N is observed in basalts erupted along the axis of the Mid-Atlantic Ridge across the Equatorial fracture zones. The anomaly is probably caused by the Sierra Leone mantle plume now in off-ridge position. The aseismic Sierra Leone and Ceara Rise reflect the activity of this hotspot in the past, when it was centered over the ridge axis.

Keywords

Pb-Sr-Nd isotopes
MOR basalts
Mid-Atlantic ridge
Mantle plumes.

Affiliation

Citation (ISO format)

FONTIGNIE, Denis André, SCHILLING, Jean-Guy, HANAN, B.B. Géochimie isotopique des basaltes de la ride médio-océanique de l’Atlantique Equatorial. In: Schweizerische mineralogische und petrographische Mitteilungen, 1992, vol. 72, n° 1, p. 123–127. doi: 10.5169/seals-54901

Article (Published version)

Identifiers

PID : unige:163439
DOI : 10.5169/seals-54901

ISSN of the journal0036-7699

47views

3downloads

Creation09/20/2022 6:33:00 AM

First validation09/20/2022 6:33:00 AM

Update time03/16/2023 7:35:34 AM

Status update03/16/2023 7:35:33 AM

Last indexation08/31/2023 9:24:58 AM

Archive ouverte UNIGE

Géochimie isotopique des basaltes de la ride médio-océanique de l'Atlantique Equatorial

Technical informations