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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Provenance Investigations Using Magnetic Susceptibility
David L. Kimbrough, Patrick L. Abbott, R. Gordon Gastil, Patrick J. W. Hamner
ABSTRACT
Magnetic-susceptibility measurements of sandstone and granitoid conglomerate clasts in Upper Cretaceous forearc strata of the Cabrillo Formation in San Diego indicate that the source region(s) were dominated by ilmenite-series granitoid rocks similar to those that underlie the eastern part of the mid-Cretaceous Peninsular Ranges batholith (PRB). These data are consistent with recent thermochronologic studies of the batholith and forearc sandstone that document rapid uplift, cooling, and erosion in the eastern part of the batholith at approximately the same time the Cabrillo Formation was deposited.
Magnetic susceptibility of sandstone through part of a
6 km-thick section of Neogene rift-related strata in the western Salton
Trough clearly record the abrupt arrival in earliest Pliocene time of ancestral
Colorado River sediments into the basin. Pre-Colorado River sediments are
dominated by local ilmenite-only granitoid source regions of the eastern
Peninsular Ranges that contrast with regional magnetite-bearing Colorado
River sands. The transition previously has been recognized via painstaking
petrographic and micropaleontologic studies. The change in provenance can
be recognized in a few minutes in the field using in situ magnetic-susceptibility
measurements.
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