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Pälike, Heiko; Frazier, Julia; Zachos, James C (2006): Age models, stable isotope record, and physical properties of ODP Hole 154-926B. PANGAEA,, Supplement to: Pälike, H et al. (2006): Extended orbitally forced palaeoclimatic records from the equatorial Atlantic Ceara Rise. Quaternary Science Reviews, 25(23-24), 3138-3149,

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We extend existing high-resolution Oligocene–Miocene proxy records from Ocean Drilling Program (ODP) Leg 154. The extended record spans the time interval from ~17.86 to 26.5 Ma. The data are age calibrated against a new astronomical solution that affords a re-evaluation of the intricate interaction between orbital (“Milankovitch”) forcing of the climate and ocean system, and the fidelity with which this forcing is recorded in oxygen and carbon stable isotope measurements from benthic foraminifera, and associated lithological proxy records of magnetic susceptibility, colour reflectance, and the measured sand fraction. Our records show a very strong continual imprint of the Earth's obliquity cycle, modulate in amplitude every ~41 ka, a very strong eccentricity signal in the carbon isotope records, and a strong, but probably local, imprint of climatic precession on the coarse fraction and magnetic susceptibility records. Our data allowed us to evaluate how the interaction of long, multi-million year beats in the Earth's eccentricity and obliquity are implicated in the waxing and waning of ice-sheets, presumably on Antarctica. Our refined age model confirms the revised age of the Oligocene–Miocene boundary, previously established by analysis of the lithological data, and allows a strong correlation with the geomagnetic time scale by comparison with data from ODP Site 1090, Southern Ocean.
Related to:
Laskar, Jacques; Joutel, F; Boudin, F (1993): Orbital, precessional, and insolation quantities for the earth from -20 Myr to +10 Myr. Astronomy and Astrophysics, 270(1-2), 522-533
Laskar, Jacques; Robutel, P; Joutel, F; Gastineau, M; Correia, A C M; Levrard, B (2004): A long-term numerical solution for the insolation quantities of the Earth. Astronomy and Astrophysics, 428(1), 261-285,
Shackleton, Nicholas J; Crowhurst, Simon J; Weedon, Graham P; Laskar, Jacques (1999): Astronomical calibration of Oligocene-Miocene time. Philosophical Transactions of the Royal Society of London Ser. A, 357(1757, 1907-1929,
Shackleton, Nicholas J; Hall, Michael A (1997): The Late Miocene stable isotope record, Site 926. In: Shackleton, N.J., Curry, W.B., Richter, C., and Bralower, T.J. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 154, 367-373,
Latitude: 3.719130 * Longitude: -42.908400
Date/Time Start: 1994-02-21T10:30:00 * Date/Time End: 1994-02-25T19:00:00
Minimum DEPTH, sediment/rock: 320.32 m * Maximum DEPTH, sediment/rock: 557.90 m
154-926B * Latitude: 3.719130 * Longitude: -42.908400 * Date/Time Start: 1994-02-21T10:30:00 * Date/Time End: 1994-02-25T19:00:00 * Elevation: -3610.0 m * Penetration: 605.8 m * Recovery: 593.25 m * Location: North Atlantic Ocean * Campaign: Leg154 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 64 cores; 605.8 m cored; 0 m drilled; 97.9 % recovery
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmGeocode
2Depth, compositeDepth compmcdPälike, Heiko
3Age modelAge modelkaPälike, Heikofrom Shackleton et al. (1999) using astronomical solution from Laskar et al. (1993)
4Age model, optionalAge model optkaPälike, Heikore-adjusted to Lasker et al. (2004)
5Cibicidoides spp., δ13CCibicidoides spp. δ13C‰ PDBPälike, HeikoC. mundulus + C. cresbi
6Cibicidoides spp., δ18OCibicidoides spp. δ18O‰ PDBPälike, HeikoC. mundulus + C. cresbi
7δ18O, adjusted/correctedδ18OPälike, Heikoto adjust for sea-water disequilibrium (Shackleton and Hall, 1997)
8Size fraction > 0.065 mm>65 µm%Pälike, Heiko
9--Pälike, Heikoasin: arcsin(root(5coarse fracttion/100))
10Susceptibility, volumekappa10-6 SIPälike, Heiko
11Color, L*, lightnessL*Pälike, Heiko
20128 data points

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