The preliminary study of palaeoclimatic and palaeoenvironmental indicators and their information on geological disasters in lake records

The occurrence of geological disasters is interpreted to be closely related to palaeoclimatic and palaeoenvironmental changes. In this paper, the authors present a new analysis of palaeoclimatic and palaeoenvironmental indicators and their information on geological disasters as revealed by lake records. For a given geological environment, when the precipitates reach their upper limits, some geological disasters such as landslides, collapses and clastic flows may be triggered. In other words they are often initiated in the areas where the amount and strength of the precipitates are great enough to cause the cyclic systems of ground water to be saturated. The information on geological disasters may be detected from grain sizes, lower δ¹⁸O and lower δ¹³C values, lower carbonate contents, and higher organic matter contents of the sediments preserved in the lacustrine environments.