| 我国某盐湖现代钾盐沉积的形成 |
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| 引用本文： | 孙大鹏.我国某盐湖现代钾盐沉积的形成[J].地球化学,1974(4):230-248. |
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| 作者姓名： | 孙大鹏 |
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| 摘 要： | The purpose of this paper is to discuss from a hydrechemieal and physieochemieal view point the formation of reeent potash deposits in a salt lake lying in a Quarternary depression of a certain basin in China. Its surface brine, which varies seasonally and annually in composition, is of MgSO4 subtype and is highly mineralized with a low metamorphic eoefficient (MgSO4/MgCl2= 0.029). These deposits are distributed at the northern and northeastern banks of the lake, far away from riverwater supply. Mineralogical composition of the deposits is quite simple, eonsisting mainly of halits and earnallites. The formation of natural potash took place as the eoncentration of surface brine reached a certain point during evaporation. Rate of precipitation, eomposition and grain size of the carnallite sediment are largely dependent upon ebanges in brine concentration. The presenee of these recent potash deposits in present-day basins and continental salt lakes demonstrates that continental salt-bearing basins should likewise be taken as promising areas for aneient potassium salt prospecting.
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| 关 键 词： | 盐湖 钾盐 沉积学 成矿作用 |
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