Figure 1From: Spatial and temporal variations of Rb/Sr ratios of the bulk surface sediments in Lake QinghaiLocations of the surface cores. The black filled ones show the cores for which element contents were measured in this study. Sizes of the circles indicate the sedimentation rates derived from 137Cs radioactivities (ranged between 0.45~2.05 mm/a; see Table 1 in reference [7]).Back to article page