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Chromian tourmaline and associated Cr-bearing minerals from the Nevado-Fildbride Complex (Betic Cordilleras, SE Spain)

Published online by Cambridge University Press:  05 July 2018

J. Torres-Ruiz ,
A. Pesquera  and
V. López Sánchez-Vizcaíno
J. Torres-Ruiz*
Affiliation:
Departameno de Mineralogía y Petrología, Facultad de Ciencias, Universidad, de Granada, Fuentenueva s/n, 18002 Granada, Spain
A. Pesquera
Affiliation:
Departamento de Mineralogía y Petrología, Universidad del Pais Vasco 644, 48080 Bilbao, Spain
V. López Sánchez-Vizcaíno
Affiliation:
Departamento de Geología, Universidad de Jaén, E.U. Politécnica de Linares, C/ Alfonso X el Sabio 28, 23700 Linares, Spain
*
* E-mail: jotorres@ugr.e
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Abstract

Chromian tourmaline, in association with other Cr-bearing minerals (amphibole, mica, epidote, chlorite, titanite, rutile and chromian spinel), occurs in fine calc-schist levels within metacarbonate rocks from the Nevado-Filabride Complex, SE Spain. Electron microprobe analyses of tourmaline and coexisting minerals document both chemical differences dependent on the host-rock type and an irregular distribution of Cr at grain scale. Tourmaline is Na-rich dravite, with average Mg/(Mg+Fe) ratios of 0.83 and 0.63 a.p.f.u. and Cr contents of 0.32 and 0.18 a.p.f.u., in dolomitic and ankeritic marbles, respectively. Tourmaline contains small but significant concentrations of Zn (av. 0.01 a.p.f.u.) and in ankeritic marble it also contains Ni (av. 0.04 a.p.f.u.). Zn-rich chromian spinel appears as small relict inclusions in silicates, with average Cr, Fe, Al and Zn contents of 1.201, 1.241, 0.411 and 0.107 a.p.f.u., respectively. Amphibole, epidote, mica and chlorite show average Cr contents of 0.088, 0.138, 0.115 and 0.267 a.p.f.u., respectively, in dolomitic marbles, and 0.103, 0.078, 0.065 and 0.185 a.p.f.u., respectively, in ankeritic marbles. Cr-silicates formed through metamorphic reactions involving detrital Cr-rich spinel, in addition to clay minerals and carbonates. The B necessary to form tourmaline was probably derived from the leaching of underlying evaporitic rocks.

Keywords

chromian tourmalineCr-bearing silicatesZn-rich chromiteNevado-Filabride ComplexSpain.
Type
Research Article
Information
Mineralogical Magazine , Volume 67 , Issue 3 , June 2003 , pp. 517 - 533
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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