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The chemistry of major cations (Mg2+, Ca2+, Na+ and K+) and anions (HCO3-, SO42- and Cl-) in the water of Lake Pumayum Co and of its inflow river were studied, and the results revealed the obvious ionic difference among various inflow rivers and the lake. The chemical type of the lake water was Mg2+-Ca2+-HCO3--SO42-, and the major ions of the main inflow river were Ca2+ -Mg2+-HCO3-. In the lake inlet within the depth less than 2m of Jiaqu River, the main inflow river, there was significant variance of water chemistry. However, it was almost same at other area of the lake. Jiaqu River had a distinct effect on the chemistry of the water on the estuary delta, whereas other rivers have minor effect on the water on estuary. The Gibbs plot revealed that chemical compositions of the lake water was correlative with rock weathering in the drainage area. Ion ratio and ternary plots further explored the main processes controlling the water chemistry of the catchment were carbonate weathering, pyrite weathering and silicate weathering. The different water chemical characteristics between river water and lake water may result from the CaCO3 precipitation. The outcome will benefit comprehending the environmental significance of carbonate in lacustrine sediment.

Composition, spatial distribution and environmental significance of water ions in Lake Pumayum Co and its catchment, Southern Tibet