Citation:

2012GC004096

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Abstract:

Timing is crucial to understanding the causes and consequences of events in Earth history. The calibration of geological time relies heavily on the accuracy of radioisotopic and astronomical dating. Uncertainties in the computations of Earth's orbital parameters and in radioisotopic dating have hampered the construction of a reliable astronomically calibrated time scale beyond 40 Ma. Attempts to construct a robust astronomically tuned time scale for the early Paleogene by integrating radioisotopic and astronomical dating are only partially consistent. Here, using the new La2010 and La2011 orbital solutions, we present the first accurate astronomically calibrated time scale for the early Paleogene (47-65 Ma) uniquely based on astronomical tuning and thus independent of the radioisotopic determination of the Fish Canyon standard. Comparison with geological data confirms the stability of the new La2011 solution back to ~54 Ma. Subsequent anchoring of floating chronologies to the La2011 solution using the very long eccentricity nodes provides an absolute age of 55.530 {plus minus} 0.05 Ma for the onset of the Paleocene/Eocene Thermal Maximum (PETM), 54.850 {plus minus} 0.05 Ma for the early Eocene ash -17, and 65.250 {plus minus} 0.06 Ma for the K/Pg boundary. The new astrochronology presented here indicates that the intercalibration and synchronization of U/Pb and 40Ar/39Ar radiometric geochronology is much more challenging than previously thought.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Median Latitude: -8.876308 * Median Longitude: -26.578025 * South-bound Latitude: -27.186000 * West-bound Longitude: -54.733050 * North-bound Latitude: 9.433333 * East-bound Longitude: 1.577000

Date/Time Start: 2003-01-22T00:00:00 * Date/Time End: 2003-03-27T21:25:00

Event(s):

207-1258 * Latitude: 9.433333 * Longitude: -54.733050 * Date/Time Start: 2003-01-22T00:00:00 * Date/Time End: 2003-02-01T00:00:00 * Elevation: -3192.2 m * Penetration: 1393.4 m * Recovery: 882.7 m * Location: South Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 141 cores; 1116.6 m cored; 276.8 m drilled; 79 % recovery

208-1262A * Latitude: -27.186000 * Longitude: 1.577000 * Date/Time Start: 2003-03-24T13:00:00 * Date/Time End: 2003-03-26T12:40:00 * Elevation: -4759.0 m * Penetration: 161.5 m * Recovery: 163.53 m * Location: Walvis Ridge, Southeast Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 161.5 m cored; 0 m drilled; 101.3 % recovery

208-1262B * Latitude: -27.185830 * Longitude: 1.577000 * Date/Time Start: 2003-03-26T12:40:00 * Date/Time End: 2003-03-27T21:25:00 * Elevation: -4753.6 m * Penetration: 209.9 m * Recovery: 212.53 m * Location: Walvis Ridge, Southeast Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 23 cores; 209.9 m cored; 0 m drilled; 101.3 % 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

Westerhold, T; Röhl, U; Laskar, J (2012): (Table S1) Bulk stable carbon and oxygen isotope data analyzed from ODP Site 1258. https://doi.org/10.1594/PANGAEA.783346
Westerhold, T; Röhl, U; Laskar, J (2012): (Table S2) XRF core scanning Fe intensity data from ODP Site 1262. https://doi.org/10.1594/PANGAEA.783351
Westerhold, T; Röhl, U; Laskar, J (2012): (Table S3) Minimal tuning age model option 1, 2 & 3 for ODP Site 1258 and 1262. https://doi.org/10.1594/PANGAEA.783353