Sr-rich minerals in a carbonatite skarn, Fuerteventura, Canary Islands (Spain)

A. Ahijado, R. Casillas, G. Nagy, Carlos Fernández

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Metamorphosed carbonatites and related skarn deposits, located in Fuerteventura Basal Complex, contain unusual Sr-rich minerals. Maximum SrO concentration in the following minerals are: calcite, 7.23 wt%; apatite, 5.22 wt%; epidote, 11.64 wt%; clinozoisite, 1.25 wt%; allanite, 5.63 wt%; britholite, 4.11 wt% and a Sr-Na aluminosilicate (probably stronalsite), 16.44 wt% SrO. Calcite and apatite are chemically similar to those found in carbonatites and are therefore considered to be of igneous origin. Textural evidence indicates that the first skarn stage garnet+diopside+Sr-Na aluminosilicate formed as the result of chemical interaction between carbonatites and adjacent silicate rocks. The formation of Sr-bearing epidote/clinozoisite, allanite and britholite appears to be related to the release of Sr into the fluid phase from the breakdown of high temperature assemblages during the retrograde skarn stage. During the final evolution stages, further alteration of britholite by bastnäsite and törnebohmite took place. The occurrence of REE minerals shows that the fluids responsible for this metasomatism must also have transported significant quantities of REE.

Original languageEnglish
Pages (from-to)107-127
Number of pages21
JournalMineralogy and Petrology
Volume84
Issue number1-2
DOIs
Publication statusPublished - May 1 2005

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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