AMS, ultrasonic P-wave velocity and rock strength analysis in quartzites devoid of mesoscopic foliations – implications for rock mechanics studies

Abstract In this study anisotropy of magnetic susceptibility (AMS) measurements are made on quartzites that do not contain visible foliations. Using AMS data, the magnetic foliation is recognized in the quartzites. Ultrasonic P-wave velocity and point load strength (which is a proxy for uniaxial compressive strength) are determined in cores drilled parallel as well as perpendicular to the magnetic foliation. Ultrasonic P-wave velocity is greater in the direction parallel to the foliation and lower perpendicular to the same. Conversely, point load strength is lower in the direction parallel to the magnetic foliation and greater perpendicular to it. AMS data are compared with the anisotropy of P-wave velocity as well as rock strength anisotropy. It is noted that quartzites with a strong magnetic fabric also have a high P-wave velocity anisotropy as well as rock strength anisotropy. Based on the results, usefulness of AMS in identification of principal testing directions for rock mechanics investigations in rocks devoid of mesoscopic foliations is discussed.

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