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活动陆块背景下蒸发盆地后生阶段富钾区的演变

DOI: 10.11867/j.issn.1001-8166.2014.04.0515, PP. 515-522

Keywords: 钾盐,成盐源控论,地下卤水运移,四川盆地

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Abstract:

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。

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