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A newly discovered kimberlitic rock from Pakistan

Published online by Cambridge University Press:  05 July 2018

Zulfiqar Ahmed  and
George R. McCormick
Zulfiqar Ahmed
Affiliation:
Centre of Excellence in Mineralogy, University of Baluchistan, GPO Box 43, Quetta, Pakistan
George R. McCormick
Affiliation:
Department of Geology, University of Iowa, Iowa City, Iowa 52242, U.S.A., and Centre of Excellence in Mineralogy, University of Baluchistan, Quetta, Pakistan
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Abstract

This first report of the occurrence of a kimberlitic rock in Pakistan is supported by its field relations, textures and mineral chemistry. Linear dykes, lenses, conical and pipe-like bodies, plugs and sills intrude non-orogenic, early Jurassic limestone near the SW extremity of an Eocene-emplaced ophiolite on the transform-type Indian plate margin; far away from the stable Precambrian craton. The rock resembles ‘micaceous kimberlites’ petrographically and contains olivine, phlogopite, perovskite, chromian spinel, monticellite, chlorite, serpentine, calcite, apatite, pectolite, clinopyroxene, amphibole, nepheline, magnetite and titanomagnetite. The minerals and their microprobe analyses resemble those of kimberlitic rocks.

Keywords

kimberlitesmineral chemistryolivinephlogopitemonticelliteperovskiteBaluchistanPakistan
Type
Mineralogy and Petrology
Information
Mineralogical Magazine , Volume 54 , Issue 377 , December 1990 , pp. 537 - 546
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1990

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