Nicora, Alda; Premoli Silva, Isabella (1990): Late Eocene larger foraminifera and other fossils of ODP Leg 115 holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.757583, Supplement to: Nicora, A; Premoli Silva, I (1990): Paleogene shallow-water larger foraminifers from holes 714A abd 715A, Leg 115, Indian Ocean. In: Duncan, RA; Backmann, J; Peterson, LC; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 115, 381-393, https://doi.org/10.2973/odp.proc.sr.115.148.1990
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Abstract:
Shallow-water larger foraminifers have been recovered at two drill sites on the eastern Maldive Ridge. Despite the poor recovery in Hole 715A, a rather diversified larger benthic foraminifer assemblage allowed us to date the initiation of a carbonate platform, resting on volcanic basement, as late early Eocene. Several age-diagnostic species belonging to the genera Alveolina, Nummulites, Orbitolites, and Discocyclina have been identified. The assemblages may be attributable to the upper part of the Nummulites burdigalensis cantabricus Zone and/or to the lower part of the Nummulites campesinus Zone and to the Alveolina dainellii (upper part) and/or to the A. violae (lower part) zones. The carbonate platform had a very short life (a few hundred thousand years) and rapidly sank below the euphotic zone, as testified by the occurrence of several species of planktonic foraminifers associated with redeposited reef-derived skeletal debris, especially discocyclinids, in the upper part of the sequence. Among the planktonic foraminifers, the presence of Planorotalites palmeri, which has a range confined to the lower portion of the late early Eocene Zone P9, implies that the platform was drowned before the end of the early Eocene.
At Hole 714A, the occurrence of several shallow-water foraminifer genera, such as Nummulites (N. fabianii gr.), Discocyclina, Fabiania, Heterostegina, and Operculina (O. gomezi), in pebbles derived from turbidite beds interbedded within late Oligocene pelagic sediments, allows us to suggest that a carbonate platform, possibly reduced in size, was still growing in the Maldive Ridge area after the late early Eocene time. The erosional event, responsible for the redeposition of middle to late Eocene reef-derived skeletal debris, is apparently coeval with the global sea-level fall recorded in late Oligocene Zone P22.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 5.070750 * Median Longitude: 73.809000 * South-bound Latitude: 5.060000 * West-bound Longitude: 73.786700 * North-bound Latitude: 5.081500 * East-bound Longitude: 73.831300
Date/Time Start: 1987-06-23T03:55:00 * Date/Time End: 1987-06-28T07:45:00
Event(s):
115-714A * Latitude: 5.060000 * Longitude: 73.786700 * Date/Time Start: 1987-06-23T03:55:00 * Date/Time End: 1987-06-24T04:15:00 * Elevation: -2041.0 m * Penetration: 233 m * Recovery: 194.63 m * Location: Lakshadweep Sea * Campaign: Leg115 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 25 cores; 233 m cored; 0 m drilled; 83.5 % recovery
115-715A * Latitude: 5.081500 * Longitude: 73.831300 * Date/Time Start: 1987-06-24T16:00:00 * Date/Time End: 1987-06-28T07:45:00 * Elevation: -2273.0 m * Penetration: 287.8 m * Recovery: 137.62 m * Location: Lakshadweep Sea * Campaign: Leg115 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 31 core; 287.8 m cored; 0 m drilled; 47.8 % 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
- Nicora, A; Premoli Silva, I (1990): (Table 2) Distribution of early late Eocene fossil content in ODP Hole 115-714A. https://doi.org/10.1594/PANGAEA.757582
- Nicora, A; Premoli Silva, I (1990): (Table 1) Distribution of early late Eocene fossil content in ODP Hole 115-715A. https://doi.org/10.1594/PANGAEA.757580