HR: 1340h
AN: U23A-0860    [Abstracts]
TI: Gravity and Magnetic Surveys of the Weaubleau Quadrangle, South Central Missouri: Implications for an Impact Origin of the Weaubleau – Osceola Structure
AU: * Shoberg, T
EM: tshoberg@pittstate.edu
AF: Dept. of Physics, Pittsburg State University, Pittsburg, KS 66762-7501, United States
AU: Stoddard, P R
EM: prs@geol.niu.edu
AF: Dept. of Geology and Environmental Geosciences, Northern Illinois University, DeKalb, IL 60115-2854, United States
AB: In August, 2001 (gravity, magnetic) and May, 2005 (magnetic) high density, GPS-registered gravity and magnetic surveys were conducted throughout the Weaubleau (pronounced WAH-blow), MO quadrangle (located approximately 90 km north of Springfield). The 2001 survey occupied 110 sites, while the 2005 survey occupied 73 sites, with some re-occupation of the 2001 survey sites. This quadrangle was chosen for study in part because it forms the southeast quarter of a proposed impact crater. Evans et al. (2003, 2004) have proposed a 19 km structure, named the Weaubleau-Osceola structure, based on surface geology and topography. We present the results of the geophysical surveys here. In addition, perform a comparison of our reduced anomaly results with synthetic anomalies from impact structure forward models. Preliminary analysis shows little geophysical support for an impact origin for the structure.
DE: 1299 General or miscellaneous (1709)
DE: 1599 General or miscellaneous
DE: 5420 Impact phenomena, cratering (6022, 8136)
SC: Union [U]
MN: 2007 Fall Meeting