Separation of local signals from the regional paleomonsoon record of the Chinese loess plateau - A rock-magnetic approach

Details Separation of local signals from the regional paleomonsoon record of the Chinese loess plateau - A rock-magnetic approach Separation of local signals from the regional paleomonsoon record of the Chinese loess plateau - A rock-magnetic approach

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..843b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 9, p. 843-846.

Physics

65

Magnetic Signals, Magnetization, Paleoclimatology, Paleomagnetism, Paramagnetism, Rocks, China, Humidity, Monsoons, Remanence

Scientific paper

A method based on thermal unblocking of low-temperature saturation remanent magnetization is proposed for a quantitative estimation of the superparamagnetic fraction of magnetite produced by pedogenesis in the Chinese loess plateau. This method is applied to the proxy climatic records of the last 130 ka from two sites, Xifeng and Baicaoyuan, 250 km apart, but separated by the Liupan-shan mountain range. The superparamagnetic fraction increases during known warm temperature intervals at each site. The more humid site clearly has higher overall superparamagnetic fractions during most of the last 130 ka. During the period 5 to 10 ka ago, the relative humidity at both sites was the same within experimental errors. Bulk grain size evidence confirms the magnetic data, and it is suggested that the present easterly summer monsoon in China came from a more southerly direction during this time to flow parallel to Liupan-shan, resulting in very similar summer humidity at the two sites.

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