Physics
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..545u&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 5, p. 545-548
Physics
2
Geomagnetism And Paleomagnetism, Geomagnetism And Paleomagnetism: Environmental Magnetism, Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism, Geomagnetism And Paleomagnetism: Remagnetization
Scientific paper
Two coexisting populations of magnetite that vary by at least 320 kyr in age characterize the magnetomineralogy in oxic through suboxic Peru Basin sediment (7°04'S/88°28'W). 1) Primary magnetite barely underwent post-depositional alteration and yields a straightforward magnetostratigraphy (Brunhes Chron-top of Olduvai Subchron). 2) A stable, low-coercivity overprint of the NRM resides in secondary, slightly oxidized SD magnetite that recorded the Brunhes Chron direction. The secondary magnetite appears at the modern Fe-redox boundary (2.6 mbsf) and continues downhole to abruptly disappear at 5.3 mbsf in the Matuyama Chron. It can be discerned by combined analyses of directional data and the Verwey transition in low-temperature remanence measurements (20-300K) that appears concomitant with the overprint.
Dekkers Mark J.
Urbat Michael
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