Mineralogy and geochemistry of a basalt from ODP Hole 119-738C

The Lower Cretaceous tholeiitic basalt cored at Site 738, on the southernmost part of the Kerguelen Plateau, shows anomalous Sr, Nd, and Pb isotopic compositions compared to other lavas from Kerguelen Island and the Kerguelen Plateau. The strongly negative value of eNd (– 8.5) and high 207Pb/204Pb r...

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Bibliographic Details
Main Author: Alibert, Chantal
Format: Other/Unknown Material
Language:English
Published: PANGAEA 1991
Subjects:
119-738C
DRILL
Drilling/drill rig
Indian Ocean
Joides Resolution
Leg119
Ocean Drilling Program
ODP
Antarc*
Antarctica
East Antarctica
Kerguelen Islands
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.758111
https://doi.org/10.1594/PANGAEA.758111
Description
Summary:The Lower Cretaceous tholeiitic basalt cored at Site 738, on the southernmost part of the Kerguelen Plateau, shows anomalous Sr, Nd, and Pb isotopic compositions compared to other lavas from Kerguelen Island and the Kerguelen Plateau. The strongly negative value of eNd (– 8.5) and high 207Pb/204Pb ratio (15.71) reflect a long-term evolution in a source high in Nd/Sm and µ. These geochemical properties, not observed in the Indian Ocean mantle plumes (St. Paul, Kerguelen Islands), have been reported for alkali lavas erupted in East Antarctica, thus suggesting that they originate from the Gondwana subcontinental lithosphere.

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