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中文摘要：
目的研究古三门湖的盐度数值。方法在渭河盆地渭南部分地区的古三门湖沉积地层中采集泥岩样品，分析了样品中的B元素，然后利用有关公式求得古三门湖的盐度。结果渭河盆地渭南段三门组盐度变化范围大致为1．66％～1．88％，游河组盐度变化范围大致为1．38％～2.06％。结论渭南段三门组为低盐度沉积，游河组为低盐度一半咸水沉积。
英文摘要：
Aim To obtain the paleosalinity of the ancient Sanmen Lake. Methods Several samples of mudstone were collected in the Weinan Area of Weihe River Basin, Shaanxi Province, China ; the element values of boron from the samples were analysed and the paleosalinity of the ancient Sanmen lake was calculated using the formula concerned. Results In the Weinan Area, the Sanmen Formation＇s salinity varies roughly froml. 66% to 1.88% ,and the Youhe Formation＇s salinity varies approximately from 1.38% to 2.06%. Conclusion In studied area, the Sanmen Formation belongs to a low salinity deposit, the Youhe Formation belongs to low salinity to brackish water deposit.
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