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Miller, Kenneth G; Wright, James D; Brower, Andrew N (1989): Oligocene to Miocene stable isotope record and planktonic foraminifer biostratigraphy of the Sierra Leone Rise. PANGAEA, https://doi.org/10.1594/PANGAEA.746537, Supplement to: Miller, KG et al. (1989): Oligocene to Miocene stable isotope stratigraphy and planktonic foraminifer biostratigraphy of the Sierra Leone Rise (DSDP Site 366 and ODP Site 667). In: Ruddiman, W; Sarnthein, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 108, 279-294, https://doi.org/10.2973/odp.proc.sr.108.177.1989

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Abstract:
We have integrated Oligocene to lower upper Miocene planktonic foraminifer biostratigraphy with benthic foraminifer (Cibicidoides spp.) stable isotope records for two sites drilled on opposite sides of the Sierra Leone Rise in the eastern equatorial Atlantic Ocean. Deep Sea Drilling Project Site 366 (2853 m present water depth; 2200-2800 m paleodepth) recovered an Oligocene to upper Miocene record with a minor unconformity in the "middle" Oligocene and a condensed middle Miocene section. Ocean Drilling Program Site 667 (3529 m present depth; 3000-3500 m paleodepth) recovered an apparently continuous "middle" Oligocene to lower middle Miocene record and a similar condensed middle Miocene section. The Oligocene to lower Miocene sections were deposited at similar sedimentation rates (~11-16 m/m.y.). Stable isotope stratigraphy proved to be useful in establishing intra- and interbasinal correlations. In addition to the well-known earliest Oligocene and middle Miocene S180 increases, a distinct d18O increase occurred near the Oligocene/Miocene boundary. Carbon isotope variations provide similar potential for improving correlations; for example, a d13C increase occurred near the Oligocene/Miocene boundary in concert with increased d18O values. There was little d13C difference between the western Atlantic and eastern Atlantic basins during the late Oligocene and most of the middle Miocene; in contrast, eastern basin d13C values were slightly lower than those in the western basins during the earliest Oligocene (about 35-33 Ma) and early Miocene (about 22-18 Ma).
Coverage:
Median Latitude: 5.123600 * Median Longitude: -20.881300 * South-bound Latitude: 4.569200 * West-bound Longitude: -21.911300 * North-bound Latitude: 5.678000 * East-bound Longitude: -19.851300
Date/Time Start: 1975-02-22T00:00:00 * Date/Time End: 1986-04-13T00:00:00
Event(s):
108-667 * Latitude: 4.569200 * Longitude: -21.911300 * Date/Time Start: 1986-04-08T00:00:00 * Date/Time End: 1986-04-13T00:00:00 * Elevation: -3529.3 m * Penetration: 520.9 m * Recovery: 437.7 m * Location: North Atlantic Ocean * Campaign: Leg108 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 56 cores; 520.9 m cored; 0 m drilled; 84% recovery
108-667A * Latitude: 4.569200 * Longitude: -21.911300 * Date/Time Start: 1986-04-08T13:45:00 * Date/Time End: 1986-04-12T10:00:00 * Elevation: -3529.3 m * Penetration: 381.3 m * Recovery: 309.16 m * Location: North Atlantic Ocean * Campaign: Leg108 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 41 core; 381.3 m cored; 0 m drilled; 81.1 % recovery
41-366 * Latitude: 5.678000 * Longitude: -19.851300 * Date/Time: 1975-02-22T00:00:00 * Elevation: -2853.0 m * Penetration: 850.5 m * Recovery: 302.8 m * Location: North Atlantic/CONT RISE * Campaign: Leg41 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 53 cores; 499 m cored; 19 m drilled; 60.7 % recovery
Size:
4 datasets

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