Salt extrusion at Kuh-e-Jahani, Iran, from June 1994 to November 1997
Salt extrusion at Kuh-e-Jahani, Iran, from June 1994 to November 1997
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1994 年 6 月至 1997 年 11 月在伊朗 Kuh-e-Jahani 进行盐挤压
DOI：
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发表时间：
2000
期刊：
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通讯作者：
Esmael Heidari
中科院分区：
文献类型：
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作者：
C. Talbot;S. Medvedev;M. Alavi;Hassan Shahrivar;Esmael Heidari
摘要Kuh-e-Jahani是扎格罗斯山脉目前最大的盐挤压区之一。盐从海平面以下约4公里处上升到海平面以上近1.5公里处，在那里，无法支撑其自身重量，它在周围的风景中蔓延，这一过程是现在和过去其他地方的异地盐层的原因。我们报告的垂直运动和明显的水平位移的43个标记分散在这座山的盐4.5年在三个连续的时间间隔，第一个18个月和其他两个12个月。盐的几何形状和推断的流速在两次调查之间发生了变化，强调重力扩散是不稳定的。我们在Kuh-e-Jahani的盐的尺寸和速度的现场读数被用来调整一个简单的数值模型，并将盐的粘度限制在1016和1017 Pa·s-1之间，其表面溶解速率限制在2-3 cm·a-1，其从孔中上升的速率限制在2-3 m·a-1。55 ka。这些结果意味着Kuh-e-Jahani的盐的强烈挤出可能接近于排空其深源，并且随着盐作为盐的溶解超过挤出，这座山将很快开始浪费。这份进展报告是有必要的，因为我们的研究结果对盐的复杂工程具有重要意义。
Abstract Kuh-e-Jahani is one of the largest extrusions of salt currently active in the Zagros mountains. Salt rises from about 4 km below sea level to nearly 1.5 km, above, where, unable to support its own weight, it spreads over the surrounding scenery in a process responsible for present and past allochthonous salt sheets elsewhere. We report vertical movements and apparent horizontal displacements of 43 markers dispersed over this mountain of salt for 4.5 years in three consecutive intervals, the first of 18 months and two others of 12 months. The geometry and inferred flow rate of the salt changed between surveys emphasizing that the gravity spreading is not steady. Our field readings of the dimensions and velocities of the salt at Kuh-e-Jahani are used to tune a simple numerical model and constrain the viscosity of the salt to between 1016 and 1017 Pa s−1, its rate of surface dissolution to 2–3 cm a−1, and its rate of rise out of its orifice at 2–3 m a−1 for c. 55 ka. These results imply that vigorous extrusion of salt at Kuh-e-Jahani is probably close to evacuating its deep source and that this mountain will soon begin to waste as salt dissolution overtakes extrusion. This progress report is warranted because our results have significant implications for sophisticated engineering in salt.