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在分析四川盆地成钾地质背景的基础上,提出“成盐源控论”的思想,“成盐源”为早期符合成盐条件下的沉降中心。指出富钾区并不一定在最利成盐的沉降中心,可能经过卤水的运移沉积在凹陷边缘压力相对较低的地带。在成岩阶段,随着沉积凹陷的不断埋深,沉积厚度不断增厚,储卤层剩余压力持续增加,温度不断上升,钾盐的溶解度升高,以至于钾盐在深盆中只会不断地溶解而不会沉积,在压实作用下,压实卤水从凹陷中心流向凹陷边缘。富含钾的地下水运移至压力相对较低的位置,在一定的条件下得以析出或富集。以四川三叠系南充盐盆杂卤石和平落坝富钾卤水成矿特点为例作进一步详细说明。
On the basis of analyzing the geological background of potassium accumulation in Sichuan Basin, the author put forward the idea of “salt source control theory” and “salt source” as the sedimentation center under the condition of early salt formation. It is pointed out that the potassium-rich zone is not necessarily the most salinized sedimentation center and may have been deposited in the relatively low pressure margin of the sag by the brine migration. In the diagenetic stage, with the deepening of the depositional depressions, the deposition thickness continuously increases, the residual pressure of the brine storage continues to increase, the temperature rises and the solubility of the potassium salt increases. As a result, the potassium salt will only continue to flow in the deep basin Dissolved without deposition, compaction, compaction brine flows from the center of the depression to the edge of the depression. Potassium-rich groundwater is transported to a relatively low-pressure location where it can be precipitated or enriched under certain conditions. Taking the Triassic Nanchong salt basin in Sichuan as an example, the characteristics of the molybdenite and the Pingluoba molybdenum brine are further discussed in detail.