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在古沉积地表环境中,钙的富集一般以成片、板状等形式产出,通过物理化学分析手段,指出Ca2+离子的来源,Ca2+离子富集条件及钙积层形成机理及其主控因素。研究结果表明,Ca2+离子从硅铝酸盐矿物颗粒中分离出来,与大气酸性水的存在密不可分,湖平面的持续下降,气候干旱,蒸发量大于降水量,河道频繁迁移摆动,河湖过渡处水流不畅等因素,有利于重碳酸钙分解形成碳酸钙沉淀,使钙积层成片、成板状大范围分布。
In the paleo-sedimentary environment, calcium enrichment is usually produced in the form of sheet and plate. Through the means of physicochemical analysis, the sources of Ca2 +, the enrichment of Ca2 + ions and the formation mechanism of Ca2 + factor. The results show that Ca2 + ions are separated from the aluminosilicate mineral particles and are inseparable from the presence of atmospheric acidic water. The lake level continues to decline, the climate is arid, the evaporation is greater than the precipitation, and the river channels frequently migrate and fluctuate. Poor water flow and other factors conducive to the formation of calcium carbonate decomposition of calcium carbonate precipitation, the accumulation of calcium into tablets, into a plate-like distribution.