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Xenocrysts in Eocene Camptonites from Taourirt, Northern Morocco

Published online by Cambridge University Press:  05 July 2018

Abdelkader Mokhtari  and
Danielle Velde
Abdelkader Mokhtari
Affiliation:
Laboratoire de Pétrologie Minéralogique, Université Pierre et Marie Curie (UA 0736 du CNRS), Tour 26, E3, 4 Place Jussieu, 75252 Paris Cedex 05, France
Danielle Velde
Affiliation:
Laboratoire de Pétrologie Minéralogique, Université Pierre et Marie Curie (UA 0736 du CNRS), Tour 26, E3, 4 Place Jussieu, 75252 Paris Cedex 05, France
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Abstract

A study of xenocrystic material included in 57 Ma igneous rocks that outcrop in the Taourirt area of north-east Morocco has been made. The mineralogy of the host rocks is essentially clinopyroxene, rare olivine, titanomagnetite and either kaersutite or biotite. Feldspars (plagioclase and alkali feldspar) and nepheline are usually altered. Accessories may include haüyne, perovskite and ferriannite-rich annite. The complex xenocrystic assemblage includes various types of clinopyroxene, amphiboles, micas of differing compositions and various types of spinel. These inclusions did not dissolve in the melt and, as a consequence, the residual (alkali-rich) mineralogical assemblage is not modified. Their abundance is such that they may not significantly affect the major element compositions, but they may strongly influence the levels of certain trace elements such as Cr and Ni.

Keywords

xenocrystsEocene camptonitesTaourirtMoroccoclinopyroxeneamphibolemica
Type
Petrology and Geochemistry
Information
Mineralogical Magazine , Volume 52 , Issue 368 , December 1988 , pp. 587 - 601
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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