Mantle peridotites from the Bouvet Triple Junction Region, South Atlantic

The Bouvet Triple Junction (BTJ) region in the South Atlantic,where the African, South American and Antarctica plates meet,is affected by several topographic ⁄ melting anomalies. Causesof these anomalies were investigated through a study ofmantle-derived serpentinized peridotites sampled from threes...

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Bibliographic Details
Published in:Terra Nova
Main Authors: BRUNELLI, Daniele, CIPRIANI, Anna, BONATTI E, OTTOLINI L.
Other Authors: Brunelli, Daniele, Bonatti, E, Cipriani, Anna, Ottolini, L.
Format: Article in Journal/Newspaper
Language:English
Published: 2003
Subjects:
mantle peridotite
Bouvet Triple Junction
slow spreading ridge
partial melting
Antarc*
Antarctic
Antarctica
Online Access:http://hdl.handle.net/11380/583636
https://doi.org/10.1046/j.1365-3121.2003.00482.x
Description
Summary:The Bouvet Triple Junction (BTJ) region in the South Atlantic,where the African, South American and Antarctica plates meet,is affected by several topographic ⁄ melting anomalies. Causesof these anomalies were investigated through a study ofmantle-derived serpentinized peridotites sampled from threesites in the BTJ region: (1) the Inner Corner High at theintersection of the America Antarctic Ridge (AAR) with theConrad transform; (2) the south wall of the Bouvet transform(South West Indian Ridge, SWIR); and (3) the eastern BouvetSWIR Transform Intersection. The degree of melting undergone by these rocks was estimated from relic mineral major- and trace-element composition. Geochemical profiles from residual peridotites and associated basalts show a > 1000-km-wide melting anomaly centred on the Bouvet and Spiess topographic anomalies.

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