Paleomagnetic results from the Jurassic La Quinta Formation in the Perijá Range, Venezuela, and their tectonic significance
Published:January 01, 1984
W. B. Maze, R. B. Hargraves, 1984. "Paleomagnetic results from the Jurassic La Quinta Formation in the Perijá Range, Venezuela, and their tectonic significance", The Caribbean-South American Plate Boundary and Regional Tectonics, William E. Bonini, Robert B. Hargraves, Reginald Shagam
Download citation file:
The paleomagnetism of 150 oriented hand samples (32 sites) of volcanic, red bed, and dike rocks, constituting the La Quinta Formation in the Perijá Range of Venezuela, has been studied. After demagnetization, consistent vectors from volcanic rocks and red beds are bipolar but show considerable scatter both before and after correction for present dip. A northwest-southeast declination predominates, however, in contrast to the northeast-southwest declination previously recorded in La Quinta strata from the Venezuelan Andes. As the declination predicted from data from the South American craton is northerly, differential rotation betwen the Perijá Range and Mérida Andes, causing opening to the north, is suggested. Six dikes give consistent northerly vectors, indicating emplacement after the differential rotations, probably in Early Cretaceous time.