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在区域化探扫面工作中,许多地区采集水系沉积物样品,基本上能反映控制区内元素含量的变化规律.但在岩溶地区,采集水系沉积物样品,效果就不一定好. 岩溶地区的溶解作用强烈,河流底沉积物大都是碳酸盐类物质,成矿、成晕元素含量严重贫化,对水中溶解形式的金属离子吸附作用也很弱.因此,建议采集具有强烈清除作用的铁、锰氧化物,氢氧化物结核或河床裂点处的沉积物.发现异常后,向上游追踪.在地下水出口处,要注意采集沉积物,追踪高含量的截止点. 因为在岩溶地貌的形成过程中,碳酸盐类物质主要呈溶解形式被岩溶水带走,存在于碳酸盐类岩石中的金属元素,有些也呈溶解形式被带走,另些则呈固态被
In the process of regionalized exploration, the sediment samples collected in many areas basically reflect the variation of elemental content in the controlled area, but the samples collected from sediments in the karst area are not necessarily effective. Dissolution is strong, most of the sediments in the river bottom are carbonate substances, the mineralization and haloting elements are seriously depleted, and the adsorption of dissolved metal ions in water is very weak.Therefore, it is recommended to collect iron with a strong scavenging effect, Manganese oxide, hydroxide nodules or sediments at the river bed crack point. After the discovery of anomalies, it is traced upstream. At the exit of groundwater, attention should be paid to the sediment collection to trace the high cut-off point. Because of the formation of karst geomorphology , Carbonate species were mainly dissolved in the form of karst water away from the presence of carbonate rocks in the metal elements, some were also taken away in dissolved form, while others were solid