Pinning down the Brunhes/Matuyama and upper Jaramillo boundaries - A reconciliation of orbital and isotopic time scales

Details Pinning down the Brunhes/Matuyama and upper Jaramillo boundaries - A reconciliation of orbital and isotopic time scales Pinning down the Brunhes/Matuyama and upper Jaramillo boundaries - A reconciliation of orbital and isotopic time scales

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.109..561t&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 109, no. 3-4, April 1992, p. 561-572. Research supported by NSF and S

Astronomy and Astrophysics

Astronomy

34

Geochronology, Orbital Elements, Paleomagnetism, Radioactive Age Determination, Solar Orbits, Stratigraphy, Argon Isotopes, Climate Change, Paleoclimatology

Scientific paper

The two reported estimates of the age of the Brunhes/Matuyama boundary (namely, 0.73 Ma, derived by Mankinen and Dalrymple (1979) using the 'chronogram technique' and 0.78 Ma obtained by Shackleton et al. (1990) using the 'astronomical technique') are reconciled by using new magnetostratigraphic data tied to high-quality Ar-40/Ar-39 dates, and a date of 0.992 for the upper Jaramillo boundary, which is considerably older than the estimate of 0.91 Ma in the chronomogram-based scale. An age of 0.746 +/-0.039 Ma is obtained for the sediment immediately overlying the Brunhes/Matuyama boundary, which is consistent with the astronomical estimates of 0.78 Ma and 0.99 Ma for the Brunhes/Matuyama and the upper Jaramillo boundaries, respectively. A new method is presented for estimating the uncertainties of the ages calculated using the chronogram technique, which uses a simple bootstrap resampling scheme.

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