标题：Bentonite’s reserves Geometry of Trebia deposit in Nador region (North eastern Morocco); Contributions of geophysical surveys and core drilling campaign
期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2015
卷号：6
期号：12
页码：3564-3573
出版社：University of Mohammed Premier Oujda
摘要：Aiming to study the bentonite of Trebia deposits in the region of Nador, two methods were used to evaluate them; - Geophysics; which allows visualizing the geometry and the lateral limits of the deposit. The geophysical method used is that of the dipole-dipole electric resistivity. Due to the lithological contrasts of the different geological units within the deposit and taking into account the presence of heterogeneous zones on surface a fairly clear picture of the bentonite body, which has a very low resistivity was produced. This low resistivity is due both to the mineralogical composition of bentonite and interstitial water contents facilitating the current flow. This method also highlights the resistivity contrasts of the subsurface and allows us to recognize discontinuity zones such as faults, dikes and magmatic intrusions. - Drilling allowed the confirmation of the underlying formations and the limits of the deposit in depth. The interpretation of the geoelectric profiles obtained allowed us to map discontinuities within the deposit is also supported by geological mapping conducted previously. The highly resistant body at depth was interpreted as a rhyolitic dome. Core drilling data covering the deposit of Trebia, combined with those of geophysics, have enabled us to develop a general outline of the shape of the bentonite body. The main bentonite layer encountered below the massive rhyolite was only partially detected by geophysics. Finally, a three-dimensional model of the orebody was developed as the result of a correlation between the two methods used in this study. In addition and as result of this study, an overall estimate of the Trebia bentonite reserves is given at the end
