莫里森建造中地下水的产状和化学特征

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在晚侏罗纪莫里森建造中,地下水与含铀-钒金属矿物的矿床有关。区域内的大部分地下水具有地下水面,但局部由于粘土层的存在,地下水为承压水。本区内的地下水主要来自降水和地表迳流的渗透,有些含于砂岩的孔隙中,而大多数赋存于节理中。地下水的运动是这样进行的,即开始由地表往下渗流,当碰到层面、泥岩层及具有弱透水性的岩石从而构成隔水层的其他地方时,就迫使地下水改变其流向,通常朝着区域倾斜的方向渗流。当具有地下水面时,在每个广阔的隔水层之上,透水的沉积物往往有几时至几呎被水所鲍和;在自流的条件下,含矿砂岩全部被水鲍和。岩石中所含的水量不多,水的运动缓慢。虽然地面的蒸发作用和植物的蒸腾作用相当强烈,从而消耗了大部分的逕流,但是逕流还是大到足够局部地形成泉和地下水的渗带出。曾对取自莫里森建造的萦尔特瓦什(Salt wash)组的布拉盆地(Brushy Basin)组的地下水样品进行了分析,以确定其化学特征和金属会计师。索尔特瓦什组中的地下水多数属于含有不同数量钙和镁离子的重碳酸盐溶液;布拉什盆地组中的地下水是含钠的硫酸盐或重碳酸盐溶液。索尔特瓦什组和布拉什盆地组中的地下水通常均为弱碱性的。多数样品中,铀、钒、铜、铅和硒的含量低于1ppm(百万分之一)。本文得出如下结论:如果金属铀和钒进入索尔特瓦什组与地下水有关,并且这种地下水可与现代的地下水相比较的话,那么所含的金属离子浓度很低。 In the late Jurassic Morrison construction, groundwater was associated with deposits containing uranium-vanadium metallogenic minerals. Most of the groundwater in the area has groundwater level, but the groundwater is confined water locally due to the presence of the clay layer. Groundwater in this area is mainly due to the infiltration of precipitation and surface turbulence, some of which are contained in sandstone pores and most of which occur in joints. The movement of groundwater is initiated by the seepage of water from the surface downwards and, when it encounters layers, mudstones and rocks with weak permeability to form other parts of the aquitard, the groundwater is forced to change its flow, usually towards Area of ​​the direction of the slope of the seepage. When there is a groundwater surface, the water-permeable deposits tend to be eaten by the water over each of the vast aquifers, and all the ore-bearing sandstones are abalone and water under gravity flow. The water contained in rocks is small and the movement of water is slow. Although the evapotranspiration on the ground and the transpiration of plants are rather strong and most of the runoff is consumed, the runoff is still large enough to locally form infiltration of springs and groundwater. Groundwater samples taken from the Brushy Basin group of the Morrison-built Salt wash group were analyzed to determine their chemical characteristics and metal accountants. Most of the groundwater in the Soolvat group belongs to bicarbonate solutions containing varying amounts of calcium and magnesium ions; groundwater in the Brash basin group is sodium sulphate or bicarbonate solutions. Groundwater in the Sautervas and the Brash Basin are generally weakly alkaline. In most samples, the content of uranium, vanadium, copper, lead and selenium is less than 1 ppm (parts per million). This paper concludes that if metal uranium and vanadium are introduced into the Sautervas group in relation to groundwater and this groundwater is comparable to modern groundwater then the concentration of metal ions contained is low.
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