Geological Society of America

58 D12. Paleoclimatology/Paleoceanography (Posters)

Tuesday, 20 March 2018
8:00 AM - 12:00 PM
Lake Champlain Exhibition Hall

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

Paper number: 58-4
Program: Technical Sessions
Time: 8:00 AM – 12:00 PM

Authors

Andrew Hollyday Presenting Author
Middlebury College, Middlebury, VT
William Amidon
Middlebury College, Middlebury, VT
Eduardo Centeno
Wesleyan University, Middletown, CT
Mark LaPan
Colgate University, Hamilton, NY
Forrest W. Lloyd
Beloit College, Beloit, WI
Suzanne B. O'Connell
Wesleyan College, Middletown, CT
J.D. Ortiz
Kent State University, Kent, OH
Melissa Mostowy
Wesleyan University, Middletown, CT

Abstract

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.

Geological Society of America Abstracts with Programs. Vol. 50, No. 2

doi: 10.1130/abs/2018NE-311339

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