Origin of Saddle Dolomite in Aqra - Bekhma Formation (Upper Campanain - Mastrichtian), Bekhma Gorge Area, North Iraq

  • Ali Mohand Naji Al-Ani Department of Geology, College of Science, University of Baghdad, Baghdad, Iraq
  • Suhad Khalaf Abdul-Raaziq Al-Nuaimi Department of Geology, College of Science, University of Baghdad, Baghdad, Iraq
Keywords: Saddle dolomite, Aqra- Bekhma formation, Bekhma Gorge, Fracture, Vug

Abstract

Thirty-four dolomite and dolomitic limestone samples were collected from Aqra – Bekhma (It is difficult to separate the two formations as they are intervening) Formation in Bekhma Gorge area near Shaqlawa in northern Iraq. Alizarin red - s was used to distinguish calcite from dolomite. The saddle dolomite was recognized as a virtually rough crystalline material with milky-white or rosy color when seen in outcrop. In addition, we observed a pearl luster and a characteristically marred crystal building that is, in principle, described as damaged crystal faces with cleavage planes, while microscopically it appeared as a widespread extinction. The crystal faces, although well advanced, are frequently pavement-like facets.

Published
2020-03-27
How to Cite
Al-AniA. M. N., & Al-NuaimiS. K. A.-R. (2020). Origin of Saddle Dolomite in Aqra - Bekhma Formation (Upper Campanain - Mastrichtian), Bekhma Gorge Area, North Iraq. Iraqi Journal of Science, 61(3), 577-583. https://doi.org/10.24996/ijs.2020.61.3.13
Section
Geology