Ishman, Scott E (1996): Benthic foraminiferal assemblages of middle to late Pliocene sediments in the North Atlantic Ocean [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.682260, Supplement to: Ishman, SE (1996): A benthic foraminiferal record of middle to late Pliocene (3.15-2.85 Ma) deep water change in the North Atlantic. Marine Micropaleontology, 27(1-4), 165-180, https://doi.org/10.1016/0377-8398(95)00058-5
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Abstract:
Records of benthic foraminifera from North Atlantic DSDP Site 607 and Hole 610A indicate changes in deep water conditions through the middle to late Pliocene (3.15 to 2.85 Ma). Quantitative analyses of modem associations in the North Atlantic indicate that seven species, Fontbotia wuellerstorfi, Cibicidoides kullenbergi, Uvigerina peregrina, Nuttallides umboniferus, Melonis pompilioides, Globocassidulina subglobosa and Epistominella exigua are useful for paleoenvironmental interpretation. The western North Atlantic basin (Site 607) was occupied by North Atlantic Deep Water (NADW) until c. 2.88 Ma. At that time, N. umboniferus increased, indicating an influx of Southern Ocean Water (SOW). The eastern North Atlantic basin (Hole 610A) was occupied by a relatively warm water mass, possibly Northeastern Atlantic Deep Water (NEADW), through c. 2.94 Ma when SOW more strongly influenced the site. These interpretations are consistent with benthic delta18O and delta13C records from 607 and 610A (Raymo et al., 1992). The results presented in this paper suggest that the North Atlantic was strongly influenced by northern component deep water circulation until 2.90-2.95 Ma. After that there was a transition toward a glacially driven North Atlantic circulation more strongly influenced by SOW associated with the onset of Northern Hemisphere glaciation. The circulation change follows the last significant SST and atmospheric warming prior to c. 2.6 Ma.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 47.111350 * Median Longitude: -25.922050 * South-bound Latitude: 41.001200 * West-bound Longitude: -32.957300 * North-bound Latitude: 53.221500 * East-bound Longitude: -18.886800
Date/Time Start: 1983-07-06T00:00:00 * Date/Time End: 1983-07-28T00:00:00
Event(s):
94-607 * Latitude: 41.001200 * Longitude: -32.957300 * Date/Time: 1983-07-06T00:00:00 * Elevation: -3427.0 m * Penetration: 284.4 m * Recovery: 248.6 m * Location: North Atlantic/FLANK * Campaign: Leg94 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 30 cores; 284.4 m cored; 0 m drilled; 87.4 % recovery
94-610A * Latitude: 53.221500 * Longitude: -18.886800 * Date/Time: 1983-07-28T00:00:00 * Elevation: -2417.0 m * Penetration: 201 m * Recovery: 191.4 m * Location: North Atlantic/RIDGE * Campaign: Leg94 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 21 cores; 201 m cored; 0 m drilled; 95.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
Download Data
Datasets listed in this publication series
- Ishman, SE (1996): (Appendix A) Benthic foraminiferal abundances and principal component scores in middle to late Pliocene desiments of DSDP Hole 94-607 from the North Atlantic. https://doi.org/10.1594/PANGAEA.682258
- Ishman, SE (1996): (Appendix B) Benthic foraminiferal abundances and principal component scores in middle to late Pliocene sediments of DSDP Hole 94-610A from the North Atlantic. https://doi.org/10.1594/PANGAEA.682259