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Northeastern Section - 53rd Annual Meeting - 2018

Paper No. 58-4
Presentation Time: 8:00 AM-12:00 PM

PRELIMINARY WAVELET ANALYSIS OF CIRCUM-ANTARCTIC ODP WELL LOGS AND SPLIT-CORE XRF SCANS FROM ODP SITE 697 CORES INFERS OBLIQUITY SIGNAL


HOLLYDAY, Andrew1, AMIDON, William H.2, CENTENO, Eduardo3, LAPAN, Mark4, LLOYD, Forrest W.5, O'CONNELL, Suzanne B.6, ORTIZ, J.D.7 and LUNA, Melissa R.3, (1)Dept. of Geology, Middlebury College, Middlebury, VT 05753, (2)Geology Department, Middlebury College, Middlebury, VT 05753, (3)Earth and Environmental Sciences, Wesleyan University, 265 Church Street, Middletown, CT 06459, (4)Geology, Colgate University, 13 Oak Dr, Hamilton, NY 13346, (5)R.D. Salisbury Department of Geology, Beloit College, 700 College Street, Beloit, WI 53511, (6)Earth and Environmental Sciences, Wesleyan College, Exley Science Center 431, Middletown, CT 06459, (7)Dept of Geology, Kent State University, Kent, OH 44242

Circum-Antarctic marine sediment archives preserve Late Pliocene and Early Pleistocene depositional geochronology linked to continental erosional systems and bottom currents. Geophysical and lithological ODP down hole well logs from the Plio-Pleistocene offer the only available marine sediment record for circum-Antarctic scientific ocean drilling sites. Even though recovered cores are often discontinuous, they can provide a higher resolution window into sedimentary process. Principal component analysis of XRF elemental counts from Weddell Sea ODP Leg 113 Site 697 split-cores reveals a dominant terrigenous elemental component, which may be linked to proximal ice erosional regimes. Wavelet analysis on both the well log and terrigenous component XRF datasets allows us to cross-calibrate proxies and identify 40, 100, and 400-kyr Milankovitch periodicities, with 40-kyr dominating. Well described, geographically-diverse linkages between continental erosion and marine deposition may inform the extent of monolithic change in Antarctic ice volume during the Pliocene.

Session No. 58--Booth# 44

D12. Paleoclimatology/Paleoceanography (Posters)
Tuesday, 20 March 2018: 8:00 AM-12:00 PM
Lake Champlain Exhibition Hall (DoubleTree by Hilton)
Geological Society of America Abstracts with Programs. Vol. 50, No. 2
doi: 10.1130/abs/2018NE-311339
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