|Mantle heterogeneity from trace elements: MAR triple junction near 14°N|
Bougault, H.; Dmitrie, L.; Schilling, J.-G.; Sobolev, A.; Joron, J.L.; Needham, H.D. (1988). Mantle heterogeneity from trace elements: MAR triple junction near 14°N. Earth Planet. Sci. Lett. 88: 27-36
In: Earth and Planetary Science Letters. Elsevier: Amsterdam. ISSN 0012-821X; e-ISSN 1385-013X, meer
|Auteurs|| || Top |
- Bougault, H.
- Dmitrie, L.
- Schilling, J.-G.
- Sobolev, A.
- Joron, J.L.
- Needham, H.D.
The trace element composition of basalts dredged at the axis of the Mid-Atlantic Ridge between 12°N and 17°N by the R/V “Akademik Boris Petrov” demonstrates the presence of a high-amplitude geochemical anomaly, centered around 14°N and extending at least 300 km along the strike of the Rift Valley. The anomaly does not fit easily into any of the models that have been proposed: it may reflect the upwelling of an embryonic mantle plume or of a passive mantle domain responsible for or associated with a triple junction, possibly marking a recent shift into the area of the South American/North American plate boundary.