Open AccessA geomagnetic event recorded in loess deposits of the Tönchesberg (Germany): identification of the Blake magnetic polarity episode
Author(s) -
Reinders Jan,
Hambach Ulrich
Publication year - 1995
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1995.tb07004.x
Subject(s) - geology , natural remanent magnetization , loess , eemian , remanence , magnetite , earth's magnetic field , paleomagnetism , diagenesis , rock magnetism , polarity (international relations) , paleosol , maghemite , interglacial , mineralogy , pleistocene , geochemistry , magnetization , paleontology , magnetic field , chemistry , biochemistry , physics , quantum mechanics , cell
SUMMARY High‐resolution palaeomagnetic studies on a collection of nearly 350 specimens, taken from a 1.30 m thick section of an Upper Pleistocene loess profile from the Tönchesberg (Germany), are described. The Blake magnetic polarity episode is recorded in a layer above the partly eroded palaeosol of the Eemian interglacial. It is identified by its stratigraphic position and thermoluminescence data (±90.0 − 110.0 kyr: Zöller, Conard & Hahn 1991; Frechen 1991, 1992). Magnetite and haematite contribute to the natural remanent magnetization (NRM). Directional behaviour during thermal and alternating‐field cleaning suggests that magnetite carries a primary, (post‐)depositional remanent magnetization (pDRM) and haematite a secondary, chemical remanent magnetization (CRM) of early diagenetic origin.