Some New Opinions concerning the Genesis of the Lacustrine Hydrothermal Deposits in Wudaoliang Group, Eastern Hoh Xil Basin
Located in Hoh Xil basin in the north of the Tibetan Plateau, Wudaoliang area possesses a lot of carbonate deposits. The authors studied the mineralogy and element geochemistry of the sediments from the south and north sections of Wudaoliang. The main mineral is calcite with a small amount of quartz in the north sections, while there are ankerite, calcite, quartz and albite in south section. According to the discovery of ankerite and secondary enlarged pore-fringes in albite, the authors hold that Wudaoliang area was affected by hydrothermal activity. The characteristic elements such as As, Sb, Ba, Fe, and the ratios like Ni/Co, Mn, Sr/Cr, V, V/Sc are relatively high. The REE patterns and the carbon and oxygen isotope characteristics also indicate the hydrothermal activities. The emergence of the laminated algae also reflects the water temperature of at least 20 to 30℃. The results obtained by the authors suggest that the Wudaoliang Group is lacustrine hydrothermal sediments. In addition, a large number of volcanic rocks were developed in Miocene, which can be used as the important clues to finding the volcano-sedimentary boron deposits.
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