Hostname: page-component-848d4c4894-ttngx Total loading time: 0 Render date: 2024-05-13T09:59:57.301Z Has data issue: false hasContentIssue false
  • English
  • Français

Sector-zoned kaersutite in camptonites from Morocco

Published online by Cambridge University Press:  05 July 2018

Abdelkader Mokhtari  and
Danielle Velde
Abdelkader Mokhtari
Affiliation:
Laboratoire de Petrologie Minéralogique, Université P. et M. Curie, E3 Tour 26, 4 place Jussieu 75252, Paris Cedex 5, France
Danielle Velde
Affiliation:
Laboratoire de Petrologie Minéralogique, Université P. et M. Curie, E3 Tour 26, 4 place Jussieu 75252, Paris Cedex 5, France
Get access Rights & Permissions [Opens in a new window]

Abstract

Camptonites from the Taourirt region of Morocco contain kaersutite crystals that exhibit clear sector zoning. The electron microprobe reveals systematic variations between sectors, with preferential enrichment of Mg and Si in sector (011) and higher values for Fe, Ti and Al in sectors (110) or (100). These differences are similar to those recorded in clinopyroxenes with hour-glass zoning where this type of crystallization has been known for more than a century.

Keywords

amphibolekaersutitesector zoningMorocco
Type
Mineralogy
Information
Mineralogical Magazine , Volume 51 , Issue 359 , March 1987 , pp. 151 - 156
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Baronnet, A. (1984) Growth kinetics of the silicates. A review of basic concepts. Fortschr. Mineral., 62, 187-232.Google Scholar
Bryan, W.B. (1972) Morphology of quench crystals in submarine basalts. J. Geophys. Res., 77, 5812-9.CrossRefGoogle Scholar
Havette, A., and Nativel, P. (1977) Apport de l'analyse ionique à l'étude minéralogique d'une ignimbrite à chimisme de benmoreite du cirque de Salazie (île de la Réunion). Bull. Soc. Fr. Mineral. Cristallogr., 100, 20-7.Google Scholar
Hollister, L.S., and Gancarz, A.J. (1971) Compositional sector-zoning in clinopyroxene from the Narce area, Italy. Am. Mineral., 56, 959-79.Google Scholar
Lacroix, A. (18935) Minéralogie de la France et de ses colonies. Description physique et chimique des minéraux. Etude des conditions géologiques de leurs gisements. Tome Premier. Paris, Librairie Polytechnique, 719 pp.Google Scholar
Leake, B.E. (1978) Nomenclature of amphiboles. Am. Mineral., 63, 1023-52Google Scholar
Mokhtari, A. (1985) Etude petrologique et minéralogique des roches éruptives alcalines éocénes (théralites) de la région de Taourirt (Maroc Oriental). ThSse 3º cycle, Université P. et M. Curie, No. 85-33, 42 pp.Google Scholar
Moukadiri, A. (1983) Les enclaves ultrabasiques associkes aux basaltes alcalins dans le district volcanique d'Azrou- Timahdite (Moyen Atlas, Maroc). Thése de 3º cycle, Géologie, No. 745, Université de Clermont Ferrand, 150 pp.Google Scholar
Nakamura, Y. (1973) Origin of sector zoning of igneous clinopyroxenes. Am. Mineral., 58, 986-90.Google Scholar
Rock, N.S. M. (1982) Chemical mineralogy of the Monchique alkaline complex, Southern Portugal. Contrib. Mineral. Petrol., 81, 64-78.CrossRefGoogle Scholar
Teall, J.J. H. (1888) British Petrography: with special reference to the igneous rocks. London, Dulau and Co. 469 pp.CrossRefGoogle Scholar
Velde, D., and Yoder, H.S. J.. (1977) Trioctahedral micas in melilite-bearing eruptive rocks. Carnegie lnst. Washington, Yearb., 76, 483-5.Google Scholar