Chemical overprint on the natural remanent magnetization of a subtropical red soil sequence in the Bose Basin, southern China

Details Chemical overprint on the natural remanent magnetization of a subtropical red soil sequence in the Bose Basin, southern China Chemical overprint on the natural remanent magnetization of a subtropical red soil sequence in the Bose Basin, southern China

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3422308d&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 22, CiteID L22308

Mathematics

Logic

1

Geomagnetism And Paleomagnetism: Remagnetization, Geomagnetism And Paleomagnetism: Magnetostratigraphy, Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism, Geomagnetism And Paleomagnetism: Paleomagnetism Applied To Geologic Processes

Scientific paper

We present a high-resolution paleomagnetic investigation of the subtropical red soil sequence at the Damei section, Bose Basin, southern China. Maghemite with low coercivities and fine-grained hematite with high coercivities but relatively low unblocking temperatures were identified as main carriers of the natural remanent magnetization (NRM). Strong chemical weathering occurring under subtropical climatic conditions in southern China led to a chemical remanent magnetization (CRM) overprint that is sufficiently strong to mask the primary NRM. Analysis of the Bose Basin soil sequence indicates that the CRM has a large lock-in depth (>4 m). This example shows that magnetostratigraphic studies on red soil sequences in subtropical-tropical southern China should be interpreted with caution.

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