Formation of Holocene Sand Layers by SEM Analyses in the Zhuye Lake Sediments

Key words: 
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• Zhuye Lake /
• quartz grain /
• SEM /
• lake sediments /
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Abstract: Sand layers are commonly embedded in lacustrine sediments from Zhuye Lake. Surface textures of quartz sands of samples from the QTH01 and QTH02 sections in Zhuye Lake were analysized and compared with samples from paleoshorelines and modern sand dunes in the study area. The results showed that samples from the QTH01 and QTH02 sections have characteristics of both typical aeolian and aqueous environments. The characteristics of aqueous environment covered on the features of aeolian environment on the samples of the Zhuye Lake sediments, while the distribution frequency of Vshaped impact pits was not common. The psephicity of samples from the QTH01 and QTH02 sections was similar to samples from modern dunes samples, and the surface textures were similar to paleoshorelines samples. These results suggested that the sand layers of Zhuye Lake had experienced aeolian environment before aqueous environment. The formation of sand layers in Zhuye Lake was similar to sands from paleoshorelines. During the period of sand layer formation, the dust activity was strong; the hydrodynamic conditions of Zhuye lake were stable; and rivers had few impacts to it.