HR: 0800h
AN: GP31C-05    [Abstracts]
TI: Combined Rock Magnetic and Dielectric studies applied to stratigraphic and archeological problems in Venezuela
AU: * Costanzo-Alvarez, V
EM: vcosta@usb.ve
AF: Departamento de Ciencias de la Tierra, Universidad Simon Bolivar, Edf. FE-II 3er piso, Sartenejas, Baruta, Mir 89000, Venezuela
AU: Aldana, M
EM: maldana@usb.ve
AF: Departamento de Ciencias de la Tierra, Universidad Simon Bolivar, Edf. FE-II 3er piso, Sartenejas, Baruta, Mir 89000, Venezuela
AU: Suarez, N
EM: nsuarez@usb.ve
AF: Departamento de Fisica, Universidad Simon Bolivar, Edf. FE-II planta baja, Sartenejas, Baruta, Mir 89000, Venezuela
AB: In the last few years the paleomagnetism research group, at the Universidad Simon Bolivar in Caracas (Venezuela), has undertaken combined studies of rock magnetism (e.g. natural magnetic remanence, magnetic susceptibility, hysteresis parameters etc.) and dielectric properties (maximum current depolarization temperatures and average activation energies) in Cretaceous and Paleogene sedimentary sequences from eastern and western Venezuela. Our main goal has been to find new ways of defining physical markers, in fossil- poor sedimentary rocks, for stratigraphic correlations. Magneto/dielectric characterizations of these rocks have proved also useful identifying lithological discontinuities and paleoenvironmental changes. More recently these two-fold technique have been extended to archeological materials (potsherds) from a series of Venezuelan islands, in order to track down clay sources and find out about different stages of pottery craftsmanship. Magneto/Dielectric characterization of archeological potsherds seems to allow the tracing of their provenance from various mainland prehistoric settlements of distinct Venezuelan amerindian groups. In this paper we present a comprehensive review of this research applied to a contact between two sedimentary formations in eastern Venezuela (Cretaceous Chimana/Querecual) and a number of pottery samples with diverse stylistic features excavated in a single archeological site from Los Roques islands.
DE: 1503 Archeomagnetism
DE: 1519 Magnetic mineralogy and petrology
DE: 1520 Magnetostratigraphy
DE: 1540 Rock and mineral magnetism
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Joint Assembly