An alternative astronomical calibration of the lower Pleistocene timescale based on ODP Site 677

Cambridge University Press (CUP) - Tập 81 Số 4 - Trang 251-261 - 1990
Nicholas J Shackleton1, Alfons Berger2, W. R. Peltier3
1Subdepartment of Quaternary Research, The Godwin Laboratory, Free School Lane, Cambridge CB2 3RS, U.K.
2Institut d'Astronomie et de Géophysique G. Lemaître, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
3Department of Physics, University of Tornoto, Ontario M5S 1A7, Canada.

Tóm tắt

ABSTRACTOcean Drilling Program (ODP) Site 677 provided excellent material for high resolution stable isotope analysis of both benthonic and planktonic foraminifera through the entire Pleistocene and upper Pliocene. The oxygen isotope record is readily correlated with the SPECMAP stack (Imbrie et al. 1984) and with the record from DSDP 607 (Ruddiman et al. 1986) but a significantly better match with orbital models is obtained by departing from the timescale proposed by these authors below Stage 16 (620 000 years). It is the stronger contribution from the precession signal in the record from ODP Site 677 that provides the basis for the revised timescale. Our proposed modification to the timescale would imply that the currently adopted radiometric dates for the Matuyama–Brunhes boundary, the Jaramillo and Olduvai Subchrons and the Gauss–Matuyama boundary underestimate their true astronomical ages by between 5 and 7%.

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Cambridge University Press (CUP)

Tập 81 Số 4

251-261

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