Madile, Marina; Monechi, Simonetta (1991): Late Eocene to early Oligocene calcareous nannofossils of ODP Holes 114-699A and 114-703A [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.755383, Supplement to: Madile, M; Monechi, S (1991): Late Eocene to early Oligocene calcareous nannofossil assemblages from sites 699 and 703, subantarctic South Atlantic Ocean. In: Ciesielski, PF; Kristoffersen, Y; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 114, 179-192, https://doi.org/10.2973/odp.proc.sr.114.185.1991
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Abstract:
Calcareous nannofossil assemblages were studied from Sites 699 and 703, drilled during ODP Leg 114 to the west and east, respectively, of the Mid-Atlantic Ridge in the subantarctic South Atlantic Ocean. Recovery at the two sites consists of an almost continuous sequence of upper Eocene-lower Oligocene sediments. This study describes the calcareous nannofossil assemblages at the transition between the Eocene and Oligocene and correlates these assemblages with those described in lower latitude sections. Quantitative analyses were performed on several important taxa in order to improve the biostratigraphic resolution and permit some paleoenvironmental interpretations. Several discrepancies were noted between the two sites and between the Eocene and Oligocene assemblages. The Eocene assemblages show a great number of species and warmer water conditions; the early Oligocene assemblages are less diversified and are indicative of cooler conditions. The Eocene/Oligocene boundary was not defined by planktonic foraminifers because of the strong dissolution, poor recovery, and drilling disturbances. On the other hand, the calcareous nannofossil assemblage allowed recognition of the interval where the Eocene/Oligocene boundary can possibly be placed.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -49.296500 * Median Longitude: -11.391150 * South-bound Latitude: -51.542000 * West-bound Longitude: -30.677000 * North-bound Latitude: -47.051000 * East-bound Longitude: 7.894700
Date/Time Start: 1987-03-20T10:45:00 * Date/Time End: 1987-04-24T07:14:00
Event(s):
114-699A * Latitude: -51.542000 * Longitude: -30.677000 * Date/Time Start: 1987-03-20T10:45:00 * Date/Time End: 1987-03-26T15:29:00 * Elevation: -3716.0 m * Penetration: 518.1 m * Recovery: 356.52 m * Location: South Atlantic Ocean * Campaign: Leg114 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 56 cores; 518.1 m cored; 0 m drilled; 68.8 % recovery
114-703A * Latitude: -47.051000 * Longitude: 7.894700 * Date/Time Start: 1987-04-21T04:59:00 * Date/Time End: 1987-04-24T07:14:00 * Elevation: -1807.0 m * Penetration: 377.4 m * Recovery: 192.29 m * Location: South Atlantic Ocean * Campaign: Leg114 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 41 core; 377.4 m cored; 0 m drilled; 51 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Madile, M; Monechi, S (1991): (Table 1) Calcareous nannofossil distribution and relative abundance in ODP Hole 114-699A. https://doi.org/10.1594/PANGAEA.755380
- Madile, M; Monechi, S (1991): (Table 2) Calcareous nannofossil distribution and relative abundance in ODP Hole 114-703A. https://doi.org/10.1594/PANGAEA.755381