地气模型中元素迁移规律

A STUDY OF ELEMENT MIGRATION REGULARITY IN GEOGAS MODEL

利用地气模型研究了上升气流作用下,铅锌矿及围岩中元素迁出规律。用电感耦合等离子体质谱分析技术检测了模拟矿(岩)层中元素迁出的量,简单估算了多种元素的迁出率。实验结果表明:在上升气流作用下,迁出的元素会在矿(岩)层上方的捕集器中不断积累;不同元素的迁出率相差很大,在0.006～4 000 ng/d范围。矿体中成矿元素赋存量大,其迁出率也大,必然在矿体上方形成异常,这为利用地气异常找隐伏矿的提供了理论依据。

A series of geogas models were built to study the element transportation regularity in the lead - zinc ore and its surrounding rocks under the action of ascending gas flows. The amount of elements transferred out of the simulated ore and rock layer were determined by ICP-MS. Then, the transportation rates of various elements were estimated. The experimental results indicate that the elements transferred out of the ore and rock layer can continually accumulate in the above catcher under the action of ascending gas flows. The transportation rates of elements are different from each other, varying in the range of 0.006 -4 000 ng/d. A large concentrations of ore -forming elements in the ore body would inevitably result in high rates of transportation, forming geogas anomalies above the ore body. The result obtained by the authors provides a theoretical basis for the prospecting of concealed deposits with geogas anomaly.