Variations of illite/chlorite ratio in Chinese loess sections during the last glacial and interglacial cycle: Implications for monsoon reconstruction

Details Variations of illite/chlorite ratio in Chinese loess sections during the last glacial and interglacial cycle: Implications for monsoon reconstruction Variations of illite/chlorite ratio in Chinese loess sections during the last glacial and interglacial cycle: Implications for monsoon reconstruction

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3220718z&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 20, CiteID L20718

Physics

3

Biogeosciences: Soils/Pedology (1865), Geomagnetism And Paleomagnetism: Environmental Magnetism, Global Change: Instruments And Techniques, Hydrology: Weathering (0790, 1625), Atmospheric Processes: Paleoclimatology (0473, 4900)

Scientific paper

The variations of the clay minerals illite and chlorite were measured by XRD in the <2 μm fraction of four loess sections along a North-South transect on the Chinese Loess Plateau (CLP). The ratio of illite to chlorite (I/C) provides a tool to evaluate strong monsoon conditions on the CLP. I/C ratios above 2.5 indicate strong chlorite (silicate) weathering, a process that takes place under a regime which, at present, in the southern CLP has annual precipitation and temperature exceeding ~600 mm and 10°C, respectively. The weathering regime during the last previous interglacial period in the southern CLP may have been warmer and had higher rainfall. During weathering the chlorite may release iron, so that nanometer-sized iron oxide minerals may form, and the free Fe2O3 and magnetic susceptibility are increased in the resulting paleosol. If that has occurred in the four sections studied, it is only in the southern two.

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