Abstract Clinoptilolite is a natural micro-porous zeolite composed of silica and alumina tetrahedra that commonly forms as a devitrification product of glass in volcanic tuffs. Besides applications in the agriculture, building and manufacturing industries, clinoptilolite has been widely studied in veterinary and human medicine because of its positive effects on health. Based on field observations and microstructural investigations, we show, for the first time, strain localization features along faults in natural zeolite tuffs in a clinoptilolite-tuff open-pit mine at Nižný Hrabovec (Slovak Republic). The faults are localized along pre-existing joints with plumose structures that acted as a pathway for the infiltration of mainly Mn- and K-rich fluids. Displacement along the faults created structures that are indicative of both velocity hardening (accommodated by dissolution precipitation creep on SC/SCC′ foliation) and velocity weakening (accommodated by multi-generations of ultracataclasites along principal slip surfaces) behaviors. Rock-fluid interaction was characterized by a high-mobility of K-rich fluids, with K-feldspar decorating the SC/SCC′ foliation, infiltrating fractures in the damage zone of the faults and precipitating as idiomorphic crystals in open cavities and along the fault surface. Microstructures such as polished slickensides, injection of fluidized cataclasites, clast-cortex grains in cataclasites and truncated grains along principal slip surfaces probably suggest that at least some of the faults formed during seismic slip.

中文翻译：

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斜发沸石-凝灰岩中的断裂带结构和应变定位（Nižný Hrabovec，斯洛伐克共和国）

摘要 斜发沸石是一种天然微孔沸石，由二氧化硅和氧化铝四面体组成，通常是火山凝灰岩中玻璃的脱玻产物。除了在农业、建筑和制造业中的应用外，斜发沸石因其对健康的积极影响而在兽医和人类医学中得到了广泛的研究。基于实地观察和微观结构调查，我们首次展示了 Nižný Hrabovec（斯洛伐克共和国）斜发沸石凝灰岩露天矿中天然沸石凝灰岩断层沿线的应变定位特征。断层沿预先存在的节理定位，具有羽状结构，作为主要富含锰和钾的流体渗透的通道。沿断层的位移产生的结构表明速度硬化（由 SC/SCC' 叶理上的溶解沉淀蠕变调节）和速度减弱（由沿主滑移面的多代超碎裂岩调节）行为。岩-流体相互作用的特点是富钾流体的高流动性，钾长石装饰SC/SCC'叶理，渗入断层损伤带的裂缝，并在开放的空腔中和沿着断层析出自形晶体表面。微结构如抛光的 slickensides、流化碎裂岩的注入、碎裂岩中的碎屑-皮质颗粒和沿主滑动面的截断颗粒可能表明至少有一些断层是在地震滑动过程中形成的。