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Cheng Kezhao Yang Zhaoxiu Zheng Xiui (Qinghai Institute of salt Lake,Academia Sinica)  
The eolian lakes are well developed on the Qinghai-Xizang plateau. From the Pliocene period up to the present, there have been two periods of mineralization. The first one took place in the Pliocene period, in which the minerals, such as gypsum, glau- ber salt and halite were major products. The second period took place from the late Pleistocene up to the present, during which boron, lithiem, potasium were highly concen- trated -one of the most significant characteristics of this period. The saline lakes on the Qinghai-Xizang Plateau can be classfied into two zones: the sulfate-chloride type in northern Xizang. Some of the saline lakes in this district developed on the basis of the Neogene fossil lakes, while others are newly grown in the Quaternary. Most of them are tectonic lakes. Rocks and hot springs are the main sources of the saliue lake mineral.
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