Strontium isotope ratios from multiple plates of two barnacle fragments from Site 1103 (Ocean Drilling Program Leg 178) provide maximum age estimates for the oldest glacial sedimentary package drilled. Three moderately preserved barnacle fragments from 262.63 meters below seafloor (mbsf) yielded a mean best-fit age of 7.4 Ma. A single, well-preserved fragment from the same horizon yielded a best-fit age of 12.2 Ma. Two moderately preserved fragments from 262.98 mbsf yielded a mean best-fit age of 7.8 Ma. The calculated mean strontium ages of 7.8 and 7.4 Ma agree well with the diatom estimates of 8.68 to 5.89 Ma for the underlying sediments.
1Lavelle, M., Barker, P.F., and Osterman, L.E., 2001. Data report: Strontium isotope dating of barnacle fragments: Antarctic Peninsula Site 1103. In Barker, P.F., Camerlenghi, A., Acton, G.D., and Ramsay, A.T.S. (Eds.), Proc. ODP, Sci. Results, 178 [Online]. Available from World Wide Web: <http://www-odp.tamu.edu/publications/178_SR/chap_27/chap_27.htm>. [Cited YYYY-MM-DD]
2British Antarctic Survey, Madingley Road, Cambridge CB3 0ET, United Kingdom. Correspondence author: m.lavelle@bas.ac.uk
3Department of Earth Sciences, University of Cambridge, Downing St., Cambridge CB2 3EQ, United Kingdom.
4U.S. Geological Survey, MS 926A, Reston VA 20192, USA.
Initial
receipt: 14 August 2000
Acceptance: 6 September 2001
Web publication: 20 December 2001
Ms 178SR-211