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Westerhold, Thomas; Röhl, Ursula; Laskar, Jacques; Bowles, Julie; Raffi, Isabella; Lourens, Lucas Joost; Zachos, James C (2007): The early Eocene global warming events: Implications from ODP Leg 208 Walvis Ridge depth transect. PANGAEA, https://doi.org/10.1594/PANGAEA.603177, Supplement to: Westerhold, Thomas; Röhl, Ursula; Laskar, Jacques; Raffi, Isabella; Bowles, Julie; Lourens, Lucas Joost; Zachos, James C (2007): On the duration of magnetochrons C24r and C25n and the timing of early Eocene global warming events: Implications from the Ocean Drilling Program Leg 208 Walvis Ridge depth transect. Paleoceanography, 22, PA2201, https://doi.org/10.1029/2006PA001322

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Abstract:
Five sections drilled in multiple holes over a depth transect of more than 2200 m at the Walvis Ridge (SE Atlantic) during Ocean Drilling Program (ODP) Leg 208 resulted in the first complete early Paleogene deep-sea record. Here we present high-resolution stratigraphic records spanning a ~4.3 million yearlong interval of the late Paleocene to early Eocene. This interval includes the Paleocene-Eocene thermal maximum (PETM) as well as the Eocene thermal maximum (ETM) 2 event. A detailed chronology was developed with nondestructive X-ray fluorescence (XRF) core scanning records and shipboard color data. These records were used to refine the shipboard-derived spliced composite depth for each site and with a record from ODP Site 1051 were then used to establish a continuous time series over this interval. Extensive spectral analysis reveals that the early Paleogene sedimentary cyclicity is dominated by precession modulated by the short (100 kyr) and long (405 kyr) eccentricity cycles. Counting of precession-related cycles at multiple sites results in revised estimates for the duration of magnetochrons C24r and C25n. Direct comparison between the amplitude modulation of the precession component derived from XRF data and recent models of Earth's orbital eccentricity suggests that the onset of the PETM and ETM2 are related to a 100-kyr eccentricity maximum. Both events are approximately a quarter of a period offset from a maximum in the 405-kyr eccentricity cycle, with the major difference that the PETM is lagging and ETM2 is leading a 405-kyr eccentricity maximum. Absolute age estimates for the PETM, ETM2, and the magnetochron boundaries that are consistent with recalibrated radiometric ages and recent models of Earth's orbital eccentricity cannot be precisely determined at present because of too large uncertainties in these methods. Nevertheless, we provide two possible tuning options, which demonstrate the potential for the development of a cyclostratigraphic framework based on the stable 405-kyr eccentricity cycle for the entire Paleogene.
Related to:
Bowles, Julie (2006): Data report: Revised magnetostratigraphy and magnetic mineralogy of sediments from Walvis Ridge, Leg 208. In: Kroon, D., Zachos, J.C., and Richter, C. (Eds.), Proceedings of the Ocean Drilling Program, Scientific Results, 208: College Station, TX (Ocean Drilling Program), 208, 1-24, https://doi.org/10.2973/odp.proc.sr.208.206.2006
Coverage:
Median Latitude: -28.285305 * Median Longitude: 2.265264 * South-bound Latitude: -28.835017 * West-bound Longitude: 1.577000 * North-bound Latitude: -27.185833 * East-bound Longitude: 2.779700
Date/Time Start: 2003-03-24T00:00:00 * Date/Time End: 2003-04-26T16:45:00
Event(s):
208-1262 * Latitude: -27.185833 * Longitude: 1.577000 * Date/Time Start: 2003-03-24T00:00:00 * Date/Time End: 2003-03-29T00:00:00 * Elevation: -4755.4 m * Penetration: 583.9 m * Recovery: 502.5 m * Location: Walvis Ridge, Southeast Atlantic Ocean * Campaign: Leg208 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 54 cores; 493.9 m cored; 90 m drilled; 101.7 % recovery
208-1263 * Latitude: -28.532950 * Longitude: 2.779567 * Date/Time Start: 2003-03-29T00:00:00 * Date/Time End: 2003-04-05T00:00:00 * Elevation: -2717.1 m * Penetration: 1261.5 m * Recovery: 709.5 m * Location: Walvis Ridge, Southeast Atlantic Ocean * Campaign: Leg208 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 93 cores; 777.9 m cored; 483.6 m drilled; 91.2 % recovery
208-1263A * Latitude: -28.532830 * Longitude: 2.779480 * Date/Time Start: 2003-03-29T15:15:00 * Date/Time End: 2003-04-02T01:25:00 * Elevation: -2717.1 m * Penetration: 345.6 m * Recovery: 295.78 m * Location: Walvis Ridge, Southeast Atlantic Ocean * Campaign: Leg208 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 40 cores; 345.6 m cored; 0 m drilled; 85.6 % recovery
Comment:
This dataset contains new high-resolution XRF-core scanning Fe intensity data of composite sections for ODP Site 1262 (table S2), Site 1263 (tableS3), and Site 1265 (tableS4). Revised composite sections can be constructed using the new offset and splice tables for Site 1263 (tableS5; offset in tableS6) and Site 1267 (splice table in tableS7; offset table in tableS8). The Magnetostratigraphy of Leg 208 Sites 1262 and 1267 is given in table S1 with the revised composite depth for Site 1267. The relative age model constructed in this study is given in table S9.
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