Mineralogy and geochemistry of alteration products in DSDP Leg 81 Holes

Alteration products of basalts from the four holes drilled during Leg 81 were studied and found to be characterized by the widespread occurrence of trioctahedral clay minerals (Mg smectite to chlorite). In some cases zeolites (analcite, chabazite) are associated with the saponite. A more oxidizing s...

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Bibliographic Details
Main Authors: Desprairies, Alain, Bonnot-Courtois, Chantal, Jehanno, Celestine, Vernhet, S, Joron, Jean Louis
Format: Dataset
Language:English
Published: PANGAEA 1984
Subjects:
Deep Sea Drilling Project
DSDP
Northeast Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.806988
https://doi.org/10.1594/PANGAEA.806988
Description
Summary:Alteration products of basalts from the four holes drilled during Leg 81 were studied and found to be characterized by the widespread occurrence of trioctahedral clay minerals (Mg smectite to chlorite). In some cases zeolites (analcite, chabazite) are associated with the saponite. A more oxidizing stage is marked by a saponite-celadonite association, presenting the geochemical characteristics of hydrothermal processes. Later stages of alteration are represented by palagonitization and subaerial weathering at two sites. These different alteration processes of basalts from Leg 81 record the paleoenvironment during the first opening stages of the Northeast Atlantic Ocean in the Paleocene-Eocene periods.

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