Monday, 27 August 2007 - 4:00 PM
1.P2.A-2
Preliminary 40Ar/39Ar results from the AND-1B core
Jake I. Ross, William C. McIntosh, and Nelia W. Dunbar. Department of Earth and Environmental Sciences, New Mexico Tech, 801 Leroy Pl, Socorro, NM 87801
Preliminary 40Ar/39Ar dating of 13 volcanic samples from four stratigraphic intervals within the AND-1B core
provide key age constraints for the development of an accurate age-model. To date seven analyses have yielded
statistically robust and stratigraphically meaningful ages. The four different stratigraphic intervals represented
by the seven successfully dated samples are: 1) 85.53-85.85 mbsf felsic tephra (1.014±0.004 Ma), 2) ~112-145 mbsf
basaltic tephra (1.65±0.05 to 1.67±0.05 Ma), 3) 646.30-649.34 mbsf basaltic lava flow (6.48±0.13 Ma), and 4) ~1280
mbsf volcanic clasts (maximum depositional age 13.57±0.13 Ma)
provide key age constraints for the development of an accurate age-model. To date seven analyses have yielded
statistically robust and stratigraphically meaningful ages. The four different stratigraphic intervals represented
by the seven successfully dated samples are: 1) 85.53-85.85 mbsf felsic tephra (1.014±0.004 Ma), 2) ~112-145 mbsf
basaltic tephra (1.65±0.05 to 1.67±0.05 Ma), 3) 646.30-649.34 mbsf basaltic lava flow (6.48±0.13 Ma), and 4) ~1280
mbsf volcanic clasts (maximum depositional age 13.57±0.13 Ma)