| _version_ | 1867171362510995456 |
|---|---|
| author | Suganuma, Yusuke Ogg, James G |
| author_facet | Suganuma, Yusuke Ogg, James G |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Ocean Drilling Program (ODP) Sites 1257-1261 recovered thick sections of Upper Cretaceous-Eocene oceanic sediments on Demerara Rise off the east coast of Surinam and French Guiana, South America. Paleomagnetic and rock magnetic measurements of ~800 minicores established a high-resolution composite magnetostratigraphy spanning most of the Maastrichtian-Eocene. Magnetic behavior during demagnetization varied among lithologies, but thermal demagnetization steps >200°C were generally successful in removing present-day normal polarity overprints and a downward overprint induced during the ODP coring process. Characteristic remanent magnetizations and associated polarity interpretations were generally assigned to directions observed at 200°-400°C, and the associated polarity interpretations were partially based on whether the characteristic direction was aligned or apparently opposite to the low-temperature "north-directed" overprint. Biostratigraphy and polarity patterns constrained assignment of polarity chrons. The composite sections have a complete polarity record of Chrons C18n (middle Eocene)-C34n (Late Cretaceous). |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_775890 |
| institution | PANGAEA |
| language | en |
| publishDate | 2006 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Magnetostratigraphy of ODP Leg 207 sediments Suganuma, Yusuke Ogg, James G 207-1257A; 207-1257B; 207-1257C; 207-1258A; 207-1258B; 207-1259A; 207-1259B; 207-1260A; 207-1260B; 207-1261A; 207-1261B; DRILL; Drilling/drill rig; Joides Resolution; Leg207; North Atlantic Ocean; Ocean Drilling Program; ODP; Walvis Ridge, Southeast Atlantic Ocean Ocean Drilling Program (ODP) Sites 1257-1261 recovered thick sections of Upper Cretaceous-Eocene oceanic sediments on Demerara Rise off the east coast of Surinam and French Guiana, South America. Paleomagnetic and rock magnetic measurements of ~800 minicores established a high-resolution composite magnetostratigraphy spanning most of the Maastrichtian-Eocene. Magnetic behavior during demagnetization varied among lithologies, but thermal demagnetization steps >200°C were generally successful in removing present-day normal polarity overprints and a downward overprint induced during the ODP coring process. Characteristic remanent magnetizations and associated polarity interpretations were generally assigned to directions observed at 200°-400°C, and the associated polarity interpretations were partially based on whether the characteristic direction was aligned or apparently opposite to the low-temperature "north-directed" overprint. Biostratigraphy and polarity patterns constrained assignment of polarity chrons. The composite sections have a complete polarity record of Chrons C18n (middle Eocene)-C34n (Late Cretaceous). |
| title | Magnetostratigraphy of ODP Leg 207 sediments |
| topic | 207-1257A; 207-1257B; 207-1257C; 207-1258A; 207-1258B; 207-1259A; 207-1259B; 207-1260A; 207-1260B; 207-1261A; 207-1261B; DRILL; Drilling/drill rig; Joides Resolution; Leg207; North Atlantic Ocean; Ocean Drilling Program; ODP; Walvis Ridge, Southeast Atlantic Ocean |
| url | https://doi.org/10.1594/PANGAEA.775890 |