magnetostratigrafia
Magnetostratigrafia is a geochronological and stratigraphic method that uses the record of Earth's magnetic field reversals preserved in rocks to determine ages and correlate sedimentary sequences. As sediments are deposited, magnetic minerals such as magnetite acquire a remanent magnetization aligned with the ambient geomagnetic field. Over time, the field has reversed many times, creating alternating normal and reversed polarity intervals that are captured in rock records and define a global polarity timescale.
In practice, magnetostratigraphic studies involve collecting oriented rock samples, measuring their natural remanent magnetization, and applying
The method relies on recognizing continuous or near-continuous records and on distinguishing primary magnetization from later
Applications include dating and correlating sedimentary sequences, basin analysis, and studies of past plate movements and