Abstract Field studies carried out in the Klodawa Salt Structure (KSS), Poland, reveal that within a carnallite-halite-kieserite sequence, finger-like structures developed during an early, pre-diapiric stage of the KSS evolution. We used 99 numerical simulations to model finger development and investigate mechanical properties of carnallite, halite and kieserite during deformation. Models used inverse density stratification of a three-layer set with varying 1) layer viscosities, 2) thicknesses and 3) density difference ratios. Finger shapes in the models were categorized into single and multiwavelength structures. Among the single-wavelength shapes, bulb, mushroom, thumb and bloated (i.e. without a regular shape) structures were distinguished. We show two transitions between the single and multiwavelength structures, which correspond to the cases of either the lower or upper layer having viscosity more than an order of magnitude larger than the two other layers. Through comparison of finger shapes developed in the models and in the natural structures, we estimate viscosities of >1017 Pa s for halite,

中文翻译：

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多层蒸发岩层序构造构造演化数值研究

摘要 在波兰克洛达瓦盐结构 (KSS) 进行的实地研究表明，在光卤石-岩盐-镁铝石序列中，在 KSS 演化的早期前底辟阶段形成了指状结构。我们使用 99 次数值模拟对手指发育进行建模，并研究变形过程中光卤石、岩盐和镁铝榴石的机械性能。模型使用三层组的逆密度分层，具有不同的 1) 层粘度、2) 厚度和 3) 密度差异比。模型中的手指形状分为单波长和多波长结构。在单波长形状中，灯泡、蘑菇、拇指和膨胀（即没有规则形状）结构被区分。我们展示了单波长和多波长结构之间的两种转变，这对应于下层或上层的粘度比其他两层大一个数量级的情况。通过比较模型和自然结构中形成的手指形状，我们估计岩盐的粘度 >1017 Pa s，