Mineralogy, grain size composition, bulk carbonate isotopic ratios and ages of ODP Site 182-1128 sediments

This report presents mineralogic and geochemical data from Ocean Drilling Program Leg 182 Site 1128 in the Great Australian Bight. Clay mineralogy is dominated by mixed-layer illite-smectite, followed by minor amounts of kaolinite and illite, with intervals of pure smectite. Carbonate mineralogy is...

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Bibliographic Details
Main Authors: Mallinson, David, Flower, Benjamin P, Hine, Albert C, Brooks, Gregg R, Molina-Garza, Roberto S, Drexler, Tina M, ODP Leg 182 Shipboard Scientific Party
Format: Other/Unknown Material
Language:English
Published: PANGAEA 2002
Subjects:
Ocean Drilling Program
ODP
Antarctic
Antarc*
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.786030
https://doi.org/10.1594/PANGAEA.786030
Description
Summary:This report presents mineralogic and geochemical data from Ocean Drilling Program Leg 182 Site 1128 in the Great Australian Bight. Clay mineralogy is dominated by mixed-layer illite-smectite, followed by minor amounts of kaolinite and illite, with intervals of pure smectite. Carbonate mineralogy is exclusively low-Mg calcite, except for one interval of dolomite in lower Oligocene sediments. Carbonate increases significantly in upper Eocene sediments, decreases through the lower Oligocene, then increases again in the Neogene. Quartz is present as a minor component that covaries inversely with carbonate. High-resolution sampling associated with Chron 13 normal (early Oligocene) reveals high-frequency (~23 k.y.) fluctuations in clay mineralogy and carbonate abundance and a positive oxygen and carbon isotope excursion (in bulk carbonates) related to Antarctic glaciation.

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