Grain size proxy

If the attenuation coefficients and mean grain sizes analyzed on discrete samples of core GeoB1510-2 are displayed as a cross plot a second order polynomial can be derived from a least square fit (Fig. 2.15a). This regression curve then allows to predict mean grain sizes using the attenuation coefficient as proxy parameter. The accuracy of the predicted mean grain sizes illus-... 

Similarly, P-wave velocities can also be used as proxy parameters for a mean grain size prediction. However, as they cover only a small range (1450 -1650 m/s) compared to attenuation coefficients (20 - 800 dB/m) they reflect grain size variations less sensitively. 

Based on the environmental proxies grain-size, TOC, CaC03 and magnetic susceptibility with wavelet analysis and AMS C datings, we have identified the climate cycle of Qinghai Lake catchment during the Holocene. The results are follows ... 

The environmental proxies of Qinghai lake show that the median grain-size, and TOC content change was mainly affected by precipitation. 

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