22. An Astronomically Calibrated Age Model for Pliocene Site 1085, ODP Leg 1751

Beth A. Christensen 2 and Mark Maslin 3


An astronomically calibrated age model for the Pliocene section of Ocean Drilling Program Leg 175 Cape Basin Site 1085 based on magnetic susceptibility data was developed using shipboard biostratigraphic datums. The composite core magnetic susceptibility record was compiled using shipboard correlations between Holes 1085A and 1085B and then tuned to the record of orbital variations in eccentricity to generate an orbitally tuned age model. Magnetic susceptibility apparently records climate variations in the Cape Basin. Strong power spectra values at the 100- and 400-k.y. frequency suggest an orbital control on the beat of Pliocene climate change in the Cape Basin.

1Christensen, B.A., and Maslin, M., 2001. An astronomically calibrated age model for Pliocene Site 1085, ODP Leg 175. In Wefer, G., Berger, W.H., and Richter, C. (Eds.), Proc. ODP, Sci. Results, 175 [Online]. Available from World Wide Web: <http://www-odp.tamu.edu/publications/175_SR/chap_22/chap_22.htm>. [Cited YYYY-MM-DD]

2Department of Earth and Environmental Sciences, Furman University, 3300 Poinsett Highway, Greenville SC 29613, USA. 

Present address: Department of Geology, 24 Peachtree Center Avenue, Georgia State University, Atlanta GA 30303, USA. bchristensen@gsu.edu

3Environmental Change Research Centre and Benfield Greig Hazard Research Centre, Department of Geography, University College London, 26 Bedford Way, London, United Kingdom.

Initial receipt: 21 February 2000
Acceptance: 18 June 2001
Web publication: 20 November 2001
Ms 175SR-204