Magnetic Properties of Source Clays: Rock Magnetic Implications

摘要

Paleomagnetic studies have helped derive chronostatic continental positions and determine timing of geochcmical events throughout the geologic record. A wide range of rock magnetic studies have identified the magnetic character of rock forming and accessory minerals. Magnetic remanence or the retention of a relict magnetic field by magnetic minerals is the fundamental rock magnetic property used to investigate paleomagnetics. Specifically, the acquisition and decay of an isothermal remanent magnetization (TRM) is often used to make mineralogic assignments in rock samples. Magnetite is often cited as the magnetic phase in sedimentary rocks of varied genetic and diagenetic histories.