Paleomagnetic results from granitic basement rocks in the Cajon Pass Scientific Drillhole
Natural remanent magnetizations in granitic rocks intersected by the Cajon Pass scientific drillhole are a composite of two superimposed magnetizations. One magnetization is a primary TRM acquired in late Cretaceous times upon initial cooling, while the other is an IRM induced by the coring device. Coring-induced IRM has obscured any pre-coring VRM, and thus core orientation using recent VRM was not possible. Primary inclinations are internally consistent and agree with expected values derived from the adjacent Sierra Nevada and Southern California batholiths.