Magnetostratigraphy and rock magnetism of the Ilerdian stratotype at Tremp, Spain

Abstract

Pascual, JO., Pares, J.M., Langereis, C.G. and Zijderveld, J.D.A., 1992. Magnetostratigraphy and rock magnetism of the Ilerdian stratotype at Tremp, Spain. Phys. Earth Planet. Inter., 74: 139—157. The first magnetic polarity stratigraphy of the Ilerdian stratotype locality—the Tremp section, Spain—has been established. In total, 315 samples from 66 levels have been demagnetized, both thermally and by alternating field. Various types of (rock) magnetic behaviors and (low- and high-temperature) magnetization components have been distinguished, and have been correlated with the three sampled rock types: clays, mans and fine-grained sandstones, and coarse-grained sandstones. The paleomagnetic directions have been classified according to their reliability in representing a primary magnetization. The magnetostratigraphy of the Tremp section is characterized by a long reversed polarity zone interrupted by a normal zone. We conclude that the normal polarity interval found in the Ilerdian stratotype may represent Chron 24.2. The lower and upper reversed intervals of the section are then respectively Chrons 24.1R and 24R.