Time scales of melt extraction revealed by distribution of lava composition across a ridge axis

Carole Cordier, Mathieu Benoit, Christophe Hémond, Jérôme Dyment, Bernard Le Gall, Anne Briais, Mitsuko Kitazawa

doi:10.1029/2010gc003074

Time scales of melt extraction revealed by distribution of lava composition across a ridge axis

DOI Web Site Web Site 被引用文献2件

Carole Cordier

Domaines Océaniques, UMR 6538 Université Européenne de Bretagne, Université de Brest, IUEM, CNRS Place N. Copernic, F‐29280 Plouzané France
Mathieu Benoit

Domaines Océaniques, UMR 6538 Université Européenne de Bretagne, Université de Brest, IUEM, CNRS Place N. Copernic, F‐29280 Plouzané France
Christophe Hémond

Domaines Océaniques, UMR 6538 Université Européenne de Bretagne, Université de Brest, IUEM, CNRS Place N. Copernic, F‐29280 Plouzané France
Jérôme Dyment

Equipe Géosciences Marines, UMR 7154 IPGP, CNRS 4 Place Jussieu, F‐75005 Paris France
Bernard Le Gall

Domaines Océaniques, UMR 6538 Université Européenne de Bretagne, Université de Brest, IUEM, CNRS Place N. Copernic, F‐29280 Plouzané France
Anne Briais

Dynamique Terrestre et Planétaire, OMP 14 avenue Edouard Belin, F‐31400 Toulouse France
Mitsuko Kitazawa

Equipe Géosciences Marines, UMR 7154 IPGP, CNRS 4 Place Jussieu, F‐75005 Paris France

書誌事項

公開日: 2010-07

権利情報

http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1029/2010gc003074

公開者: American Geophysical Union (AGU)

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説明

<jats:p>Temporal fluctuations of magmatic processes during the last 800 kyr have been investigated for the slow spreading Central Indian Ridge. The fluctuations are recorded by variations in lava chemistry along a 40 km long profile across the ridge. The temporal relations of the basalts were accurately restored using magnetic microanomalies. We report on the occurrence of ancient lavas enriched in incompatible elements whereas on‐axis samples are typical normal mid‐ocean ridge basalts. The enriched lavas are symmetrically distributed on either side of the ridge, implying that enriched melts reached the seafloor at intervals of about 150–200 kyr. This periodicity is viewed as a characteristic time scale in the aggregation processes of the melts produced from a heterogeneous mantle source. Geochemical variations of zero‐age mid‐ocean ridge basalts may primarily reflect such periodic processes rather than the spatial distribution of mantle heterogeneities.</jats:p>