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青海察尔汗盐湖中赋存有大量的气体,在察尔汗北部盐喀斯特带中气体显示较为明显,笔者就气体对盐湖矿床的影响提供若干线索,以期引起同行的关注。察尔汗盐湖位于柴达木盆地新生代达布逊断陷之中,是盆地的最低凹地带。湖区广泛发育第四系,由山麓到盐湖,呈有规律的带状分布,依次为:上更新统和全新统洪积砂砾石带;上更新统至全新统冲积洪积砂土带;冲积砂、亚砂土带;全新统湖积亚粘土带;中央为现代湖泊化学沉积。全新统湖相化学沉积,分布于盆地中央,面积5200余平方公里,沉积物主要是盐岩,在其晶间孔隙中赋存有富含 K~+,Mg~(2+)的晶间卤水,构成钾镁盐矿床。盐湖中有盐喀斯特存在(见图1),盐喀斯特的形成,主要由于北部的泉集河水出山后流经地段的第四系沉积物的分异空间狭窄,且有新构造运动隆起,破坏了山前地带地貌及岩性分带规律,湖泊碎屑沉积物远较南部粗,同时地下水迳流途径短,水力坡度大,因此在矿区
A large amount of gas is present in the Chaerhan Salt Lake in Qinghai Province. The gas in the salt karst belt in the northern Chaerhan shows more obvious gas. The author provides some clues on the influence of gas on the salt lake deposit in the hope of arousing the concern of peers. Chaerhan Salt Lake is located in the Cenozoic Daqsun Fault in the Qaidam Basin, which is the lowest depression in the basin. The Quaternary system developed extensively in the lake area from the foot of the foothills to the salt lake, showing a regular belt-like distribution, followed by the Upper Pleistocene and Holocene alluvial-gravel belt, the Upper Pleistocene to Holocene alluvial-alluvial sand zone, alluvial sand , Sub-sand belts; Holocene lacustrine sub-clay zone; the central lake for modern chemical deposition. Holocene lacustrine chemical deposition, distributed in the central basin, an area of 5200 square kilometers, the sediment is mainly salt rock, in the intergranular pores are rich in K ~ +, Mg ~ (2+) intergranular brine , Constitute potassium-magnesium salt deposit. The existence of salt karst in the salt lake (see Figure 1) and the formation of salt karst are mainly due to the narrow space of Quaternary sediments flowing through the Quaternary sediments in the north of the Quanji River and the uplift of the Neotectonic movement, destroying Piedmont topography and lithology zonation, lacustrine debris sediment is much larger than the southern part of the same time, groundwater stream flow short, hydraulic gradient, so in the mining area