Physics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.111...49k&link_type=abstract
Earth and Planetary Science Letters, Volume 111, Issue 1, p. 49-57.
Physics
3
Scientific paper
Paleomagnetic and structural data from the Pedraforca thrust sheet in the southeast Pyrenees show that the chemical weathering of the late Cretaceous limestones is a multistage process. The first weathering stage, of latest Eocene to early Oligocene age, is indicated by a chemical remanent magnetization carried by hematite. The formation of hematite as the dominant weathering product suggests a subtropical climate in northeast Spain during this period. The second weathering stage is indicated by the presence of goethite, which carries a chemical remanent magnetization parallel to the present earth field. This suggests formation of the goethite since the late Pleistocene under cooler climatic conditions similar to the present-day climate in the Pyrenees.
Gehring Andreas U.
Keller Pascale
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