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Chemical overprint on the natural remanent magnetization of a subtropical red soil sequence in the Bose Basin, southern China
Author(s) -
Deng Chenglong,
Liu Qingsong,
Wang Wei,
Liu Caicai
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl031400
Subject(s) - paleomagnetism , geology , subtropics , natural remanent magnetization , weathering , red soil , magnetostratigraphy , remanence , earth science , structural basin , geochemistry , maghemite , magnetization , paleontology , hematite , soil water , soil science , ecology , physics , magnetic field , quantum mechanics , biology
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.