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Billups, Katharina; Pälike, Heiko; Channell, James E T; Zachos, James C; Shackleton, Nicholas J (2004): Revised geomagnetic polarity timescale for the late Oligocene to early Miocene of ODP Site 177-1090 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.708128, Supplement to: Billups, K et al. (2004): Astronomic calibration of the late Oligocene through early Miocene geomagnetic polarity time scale. Earth and Planetary Science Letters, 224(1-2), 33-44, https://doi.org/10.1016/j.epsl.2004.05.004

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Abstract:
At Ocean Drilling Program (ODP) Site 1090 (subantarctic South Atlantic), benthic foraminiferal stable isotope data (from Cibicidoides and Oridorsalis) span the late Oligocene through early Miocene (~24-16 Ma) at a temporal resolution of ~5 ky. Over the same interval, a magnetic polarity stratigraphy can be unequivocally correlated to the geomagnetic polarity time scale (GPTS), thereby providing direct correlation of the isotope record to the GPTS. In an initial age model, we use the newly derived age of the Oligocene/Miocene (O/M) boundary of 23.0 Ma of Shackleton et al. (2000, doi:10.1130/0091-7613(2000)28<447:ACAFTO>2.0.CO;2), revised to the new astronomical calculation (La2003) of Laskar et al (2004, doi:10.1016/j.icarus.2004.04.005) to recalculate the spline ages of Cande and Kent (1995, doi:10.1029/94JB03098). We then tune the Site 1090 dekta18O record to obliquity using La2003. In this manner, we are able to refine the ages of polarity chrons C7n through C5Cn.1n. The new age model is consistent, within one obliquity cycle, with previously tuned ages for polarity chrons C7n through C6Bn from Shackleton et al. (2000) when rescaled to La2003. The results from Site 1090 provide independent evidence for the revised age of the Oligocene/Miocene boundary of 23.0 Ma. For early Miocene polarity chrons C6AAr through C5Cn, our obliquity-scale age model is the first to allow a direct calibration to the GPTS. The new ages are generally within one obliquity cycle of those obtained by rescaling the Cande and Kent (1995) interpolation using the new age of the O/M boundary (23.0 Ma) and the same middle Miocene control point (14.8 Ma) used by Cande and Kent (1995).
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -42.913617 * Longitude: 8.899817
Date/Time Start: 1997-12-25T00:00:00 * Date/Time End: 1997-12-25T00:00:00
Event(s):
177-1090 * Latitude: -42.913617 * Longitude: 8.899817 * Date/Time: 1997-12-25T00:00:00 * Elevation: -3701.6 m * Penetration: 936.4 m * Recovery: 874.9 m * Location: South Atlantic Ocean * Campaign: Leg177 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 101 cores; 936.4 m cored; 0 m drilled; 93.4% recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Billups, K; Pälike, H; Channell, JET et al. (2004): (Appendix A2) Obliquity-scale age control points of ODP SIte 177-1090. https://doi.org/10.1594/PANGAEA.708068
  2. Billups, K; Pälike, H; Channell, JET et al. (2004): (Appendix A1) Stable carbon and oxygen isotope ratios of benthic foraminifera from ODP Site 177-1090. https://doi.org/10.1594/PANGAEA.708067
  3. Billups, K; Pälike, H; Channell, JET et al. (2004): (Table 1) Summary of the revised ages for eraly Miocene through late Oligocene polarity chron boundaries of ODP SIte 177-1090. https://doi.org/10.1594/PANGAEA.708069