Age determination of Paleogene sediments from the Prysz Bay

Age dating of Paleogene diamictites from ODP Site 739 in Prydz Bay with marine microfossils (diatoms and calcareous nannofossils) suggests the build-up of a major East Antarctic ice shield in latest Eocene to earliest Oligocene time, about 35-38 m.y. ago. Strontium isotopic analyses of small mollusk...

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Bibliographic Details
Main Authors: Thierstein, Hans R, MacDougall, J Douglas, Martin, Ellen E, Larsen, Birger, Barron, John A, Baldauf, Jack G
Format: Other/Unknown Material
Language:English
Published: PANGAEA 1991
Subjects:
119-739
119-739C
119-743A
COMPCORE
Composite Core
DRILL
Drilling/drill rig
Joides Resolution
Leg119
Ocean Drilling Program
ODP
Prydz Bay
Antarctic
Antarc*
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.758206
https://doi.org/10.1594/PANGAEA.758206
Description
Summary:Age dating of Paleogene diamictites from ODP Site 739 in Prydz Bay with marine microfossils (diatoms and calcareous nannofossils) suggests the build-up of a major East Antarctic ice shield in latest Eocene to earliest Oligocene time, about 35-38 m.y. ago. Strontium isotopic analyses of small mollusk remains found within these diamictites, however, yield younger ages ranging from 29 to 23 Ma (i.e., latest early Oligocene to earliest Miocene). These age discrepancies could be caused by repeated glacial reworking of microfossils, macrofossils, and sediment clasts through the late Oligocene or, alternatively, by ion exchange in the still aragonitic mollusk shells.

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