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首页> 外文期刊>Facies >Possible origin of stromatactis-like cavities in Upper Jurassic sediments from the Wielkanoc quarry near Golcza (Krako′w–Czestochowa Upland, southern Poland)—experimental studies
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Possible origin of stromatactis-like cavities in Upper Jurassic sediments from the Wielkanoc quarry near Golcza (Krako′w–Czestochowa Upland, southern Poland)—experimental studies

机译：Golcza附近的Wielkanoc采石场（波兰南部克拉科夫-琴斯托霍瓦山地）上侏罗统沉积物中类间岩样空洞的可能起源—实验研究

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Isolated stromatactis-like cavities were found in a microbial-sponge buildup exposed in the Wielkanoc quarry (eastern part of the Krako′w-Cze?stochowa Upland). The cavities are filled with several generations of carbonate cements and with internal sediments. The top surfaces of internal sediments are flat or wavy, whereas the roofs of cavities are arcuate. The origin of cavities from the Krako ′w-Cze?stochowa Upland is difficult to constrain. It seems that the stromatactis-like cavities from the Wielkanoc quarry resulted, at least partly, from remodeling of open spaces left after dissolution of corals in incompletely lithified sediment. Dissolution of corals disturbed the primary stress field within the carbonate buildup and generated the secondary stress characterized by the appearance of compressional forces in the walls of cavities and tensional forces in their roofs. Thus, the lack of support of sediments over roofs of cavities after dissolution of corals resulted in their instability and collapse triggered by vibrations caused by various factors. One of such triggers might have been the rejuvenation of the Krako′w-Lubliniec Fault Zone in the Late Jurassic or the collapse of reticular framework within the buildup. The material falling down from the roofs was deposited at the bottoms of cavities as an internal sediment. Results of experimental studies demonstrate that the arcuate shapes of the roof surfaces of cavities are related to compressional stress in the walls and tensional stress in their roofs.
机译：在Wielkanoc采石场（Krako'w-Cze？stochowa高地的东部）暴露的微生物海绵堆积中发现了孤立的层间孔状腔。空腔中充满了几代碳酸盐水泥和内部沉积物。内部沉积物的上表面是平坦的或波浪形的，而空腔的顶部是弧形的。 Krako'w-Cze？stochowa高地的空洞起源很难约束。看起来，来自Wielkanoc采石场的类似层间孔的腔至少部分是由于珊瑚溶解在不完全石化的沉积物中而留下的空旷空间的重塑所致。珊瑚的溶解扰乱了碳酸盐岩内部的主应力场，并产生了以应力为特征的副应力，这些应力的特征是在空腔壁上出现了压缩力，在其屋顶上出现了拉力。因此，在珊瑚溶解后，缺乏支撑在空腔顶上的沉积物，导致其不稳定并由于各种因素引起的振动而坍塌。其中一个触发因素可能是侏罗纪晚期克拉科夫-卢比利尼奇断层带的复兴或构造内网状骨架的坍塌。从屋顶掉落的材料作为内部沉积物沉积在腔体的底部。实验研究结果表明，空腔顶表面的弧形形状与壁中的压应力和顶中的拉应力有关。

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