Calcareous nannofossil abundance in ODP Site 185-1149 sediments
Fuente:
PANGAEA
Gespeichert in:
| Hauptverfasser: | , |
|---|---|
| Format: | Dataset Open Access |
| Sprache: | en |
| Veröffentlicht: |
PANGAEA
2003
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1867170462734221312 |
|---|---|
| author | Lozar, Francesca Tremolada, Fabrizio |
| author_facet | Lozar, Francesca Tremolada, Fabrizio |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Basal carbonate sediments recovered at Ocean Drilling Program (ODP) Site 1149 lie directly on magnetic Anomaly M12. They contain abundant and moderately well preserved calcareous nannofossils. Two nannofossil zones are recognized: the lower Calcicalathina oblongata Zone and the upper Lithraphidites bollii Zone, indicating a late Valanginian-late Hauterivian age. The close occurrence of two significant bioevents, the first occurrence (FO) of L. bollii and the FO of Rucinolithus terebrodentarius in Core 185-1149B-20R, together with dip data recorded during in situ geophysical logging, suggest the presence of an unconformity that corresponds to the lower Hauterivian sedimentary section. The continuous occurrence of L. bollii is reported for the first time in sediments from the Pacific Ocean. Other marker species regarded as cosmopolitan (e.g., C. oblongata) have a sporadic occurrence. Nannoconids, very useful zonal markers for Tethyan areas, are virtually absent. The presence of an unusually high abundance of Diazomatolithus lehmanii is also recorded and correlates with the Valanginian 13C positive excursion. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_783929 |
| institution | PANGAEA |
| language | en |
| publishDate | 2003 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Calcareous nannofossil abundance in ODP Site 185-1149 sediments Lozar, Francesca Tremolada, Fabrizio 185-1149B; 185-1149C; 185-1149D; DRILL; Drilling/drill rig; Joides Resolution; Leg185; North Pacific Ocean; Ocean Drilling Program; ODP Basal carbonate sediments recovered at Ocean Drilling Program (ODP) Site 1149 lie directly on magnetic Anomaly M12. They contain abundant and moderately well preserved calcareous nannofossils. Two nannofossil zones are recognized: the lower Calcicalathina oblongata Zone and the upper Lithraphidites bollii Zone, indicating a late Valanginian-late Hauterivian age. The close occurrence of two significant bioevents, the first occurrence (FO) of L. bollii and the FO of Rucinolithus terebrodentarius in Core 185-1149B-20R, together with dip data recorded during in situ geophysical logging, suggest the presence of an unconformity that corresponds to the lower Hauterivian sedimentary section. The continuous occurrence of L. bollii is reported for the first time in sediments from the Pacific Ocean. Other marker species regarded as cosmopolitan (e.g., C. oblongata) have a sporadic occurrence. Nannoconids, very useful zonal markers for Tethyan areas, are virtually absent. The presence of an unusually high abundance of Diazomatolithus lehmanii is also recorded and correlates with the Valanginian 13C positive excursion. |
| title | Calcareous nannofossil abundance in ODP Site 185-1149 sediments |
| topic | 185-1149B; 185-1149C; 185-1149D; DRILL; Drilling/drill rig; Joides Resolution; Leg185; North Pacific Ocean; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.783929 |