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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >Geoelectrical Classification of Gypsum Rocks
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Geoelectrical Classification of Gypsum Rocks

机译：石膏岩的地电分类

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Gypsum rocks are widely exploited in the world as industrial minerals. The purity of the gypsum rocks (percentage in gypsum mineral in the whole rock) is a critical factor to evaluate the potential exploitability of a gypsum deposit. It is considered than purities higher than 80% in gypsum are required to be economically profitable. Gypsum deposits have been studied with geoelectrical methods; a direct relationship between the electrical resistivity values of the gypsum rocks and its lithological composition has been established, with the presence of lutites being the main controlling factor in the geoelectrical response of the deposit. This phenomenon has been quantified in the present study, by means of a combination of theoretical calculations, laboratory measurements and field data acquisition. Direct modelling has been performed; the data have been inverted to obtain the mean electrical resistivity of the models. The laboratory measurements have been obtained from artificial gypsum-clay mixture pills, and the electrical resistivity has been measured using a simple electrical circuit with direct current power supply. Finally, electrical resistivity tomography data have been acquired in different evaporite Tertiary basins located in North East Spain; the selected gypsum deposits have different gypsum compositions. The geoelectrical response of gypsum rocks has been determined by comparing the resistivity values obtained from theoretical models, laboratory tests and field examples. A geoelectrical classification of gypsum rocks defining three types of gypsum rocks has been elaborated: (a) Pure Gypsum Rocks (>75% of gypsum content), (b) Transitional Gypsum Rocks (75-55%), and (c) Lutites and Gypsum-rich Lutites (<55%). From the economic point of view, the Pure Gypsum Rocks, displaying a resistivity value of >800 ohm. m, can be exploited as industrial rocks. The methodology used could be applied in other geoelectrical rock studies, given that this relationship between the resistive particles embedded within a conductive matrix depends on the connectivity of the matrix particles.
机译：石膏岩石在世界上被广泛用作工业矿物。石膏岩石的纯度（占整个岩石中石膏矿物的百分比）是评估石膏矿床潜在可开采性的关键因素。人们认为，要求石膏中高于80％的纯度具有经济效益。用地电方法研究了石膏矿床;已经建立了石膏岩石的电阻率值与其岩性组成之间的直接关系，其中褐铁矿的存在是沉积物地电响应的主要控制因素。在本研究中，已通过理论计算，实验室测量和现场数据采集相结合的方式对这一现象进行了量化。直接建模已经执行;反转数据以获得模型的平均电阻率。实验室测量值是从人造石膏-粘土混合料中获得的，电阻率是使用带有直流电源的简单电路测量的。最后，在西班牙东北部不同的蒸发岩第三纪盆地中获得了电阻率层析成像数据。选定的石膏矿床具有不同的石膏成分。通过比较从理论模型，实验室测试和现场实例获得的电阻率值，可以确定石膏岩石的地电响应。已详细定义了定义三种类型的石膏岩的石膏岩电分类：（a）纯石膏岩（> 75％的石膏含量），（b）过渡石膏岩（75-55％），以及（c）褐铁矿和富含石膏的Lutites（<55％）。从经济角度来看，纯石膏岩石的电阻率值大于800欧姆。 m，可作为工业岩石开采。假设嵌入导电基质中的电阻性颗粒之间的这种关系取决于基质颗粒的连通性，那么所使用的方法可以应用于其他地电岩石研究。

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