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首页> 外文期刊>Geodinamica Acta >Origin and evolution of tufa mounds related to artesian karstic springs inIsona area (Pyrenees, NE Spain)
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Origin and evolution of tufa mounds related to artesian karstic springs inIsona area (Pyrenees, NE Spain)

机译：伊索纳地区（比利牛斯，西班牙内布拉斯加州）与自流岩溶岩泉有关的凝灰岩土墩的起源和演化

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摘要

This work analyses a suite of relict tufa mounds generated by artesian karstic springs in Isona area (Spanish Pyrenees). Geological and geophysical data (seismics and vertical electrical resistivity soundings) indicate that the location of the discharge area in which the spring mounds formed was controlled by (1) a bulge in the axial zone of the anticline that affects the Areny-Montsec aquifer, with the consequent thinning of the overlying confining unit and (2) N-S and E-W trending extensional faults. These uncommon meteogene mounds occur in two stepped morphostratigraphic units that constitute the caprock of a mesa 9 km2 in area. The upper tufa complex is 47 m thick and has yielded several U/Th dates of >350 ka. The obtained U/Th ages for the mounds of lower tufa complex, 10 m thick, range from >350 to 214 ± 11 ka. The sedimentological analysis of the scarce exposures and electrical resistivity profiles show the same morphological and depositional components as those described in geothermal springs: (1) Cylindrical vents; (2) Pools fed by the vents and dammed by annular tufa barriers; (3) Tufa barriers (rimstones) constructed by overflowing waters through vertical accretion and progradation. These rimstones may have overhanging upflow sides. (4) Slope tufa facies with terracettes and microgours.
机译：这项工作分析了由伊索纳地区（西班牙比利牛斯山脉）的自流岩溶岩泉产生的一套残渣的石灰岩土墩。地质和地球物理数据（地震和垂直电阻率测深）表明，出水区的位置形成了弹簧堆，其受以下因素的控制：（1）背斜线轴向区域的凸起影响了Areny-Montsec含水层。其结果是上覆封闭单元变薄，以及（2）NS和EW趋势性伸展断裂。这些罕见的陨石丘发生在两个阶梯状地层学单元中，构成了面积为9 km2的台地盖层。上部的石灰岩复合体厚47 m，已产生多个U / Th日期> 350 ka。对于下部石灰石复合体（厚度为10 m）的土丘，获得的U / Th年龄在> 350至214±11 ka之间。稀有暴露和电阻率剖面的沉积学分析显示出与地热泉中描述的那些相同的形态和沉积成分：（1）圆柱孔; （2）水池由通风口供给，并由环形的石灰泥屏障筑坝; （3）通过垂直积水和积水溢出水而形成的石灰石屏障（边石）。这些边缘石可能具有悬垂的上流侧。 （4）带有阶地和微泥浆的坡度石灰岩相。

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