| _version_ | 1867171361149943808 |
|---|---|
| author | Thierstein, Hans R MacDougall, J Douglas Martin, Ellen E Larsen, Birger Barron, John A Baldauf, Jack G |
| author_facet | Thierstein, Hans R MacDougall, J Douglas Martin, Ellen E Larsen, Birger Barron, John A Baldauf, Jack G |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_758206 |
| institution | PANGAEA |
| language | en |
| publishDate | 1991 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Age determination of Paleogene sediments from the Prysz Bay Thierstein, Hans R MacDougall, J Douglas Martin, Ellen E Larsen, Birger Barron, John A Baldauf, Jack G 119-739; 119-739C; 119-743A; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg119; Ocean Drilling Program; ODP; Prydz 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 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. |
| title | Age determination of Paleogene sediments from the Prysz Bay |
| topic | 119-739; 119-739C; 119-743A; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg119; Ocean Drilling Program; ODP; Prydz Bay |
| url | https://doi.org/10.1594/PANGAEA.758206 |