2006 Philadelphia Annual Meeting (2225 October 2006)
Paper No. 76-12
Presentation Time: 11:00 AM-11:15 AM

MINERAL MAGNETIC PARAMETERS AS PALEOENVIRONMENTAL PROXIES: A CASE STUDY USING ANNUALLY LAMINATED (VARVED) SEDIMENTS

LENTZ, Erika1, KING, John W.2, HUBENY, J. Bradford, and HEIL, Clifford, (1) Graduate School of Oceanography, University of Rhode Island, South Ferry Rd, Narragansett, RI 02882, elentz@gso.uri.edu, (2) Graduate School of Oceanography, University of Rhode Island, South Ferry Road, Narragansett, RI 02882

Mineral magnetic parameters have been used as indicators of increased soil erosion rates in numerous previous studies. Increased soil erosion may result from either anthropogenic activities (e.g. land clearance,cultivation) ,or naturally occuring paleoenvironmental changes (e.g. increased precipitation). We evaluate low-field susceptibility,ARM,IRM and ratios of these parameters as indicators of soil erosion. We compare stratigraphic profiles of these magnetic parameters to those of other paleoenvironmental proxies (e.g. varve thickness, GRAPE bulk density, CaCO3,and pollen). We find that mineral magnetic parameters are excellent indicators of anthropogenic activities. On the other hand, magnetic parameters need to be carefully calibrated on a site by site basis in order to be useful as indicators of climate induced changes in erosion rate.

2006 Philadelphia Annual Meeting (2225 October 2006)
General Information for this Meeting
Session No. 76
Dating and Environmental Interpretation of Lake, Loess and Marine Sediment Sequences using Paleomagnetism and Rock Magnetism
Pennsylvania Convention Center: 204 C
8:00 AM-12:00 PM, Monday, 23 October 2006

Geological Society of America Abstracts with Programs, Vol. 38, No. 7, p. 200

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