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Brine extremely rich in potassium,boron and bromine has been discovered from the Middle Triassic Leikoupo Formation at a depth of 4300 m in Sichuan Province.It contains-50g/L of K^+,>92g/L of Na^+,>12g/L of B2O3,>2.36g/L of Br^- and -0.030g/L of