Mineralogical and bulk compositional records of an advective fluid flux event near the Variscan HT-LP metamorphic climax. Catalonian Coastal Ranges, NE Iberian Peninsula

J. Reche Estrada, F. J. Martinez

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Metamorphic rocks of the Osor complex (NE Iberian peninsula) show quartz-rich gneissic semi-pelitic, and quartz-absent, mica-rich, schistose domains that have been related to the effects of infiltration of a magmatic fluid evolved during cooling of syntectonic peraluminous leucogranites and pegmatites. The infiltrating fluid became progressively alkali-rich through leaching of these elements from the enclosing metamorphic rocks as it became progressively focused in developing micaceous, high-strain domains subparallel to the main crenulation cleavage. The flux took place around the peak of the HT-LP metamorphism during nearly isobaric heating followed by initially nearly isobaric cooling evolving towards decompressional cooling. Channels of focused flow became the loci of late- to post-tectonic Na-rich plagioclase, muscovite and biotite growth. The growth of the alkali-rich phases promoted further weakening of the domains that continued to be zones of high-strain during a late extension coeval with cooling and decompression.
Original languageEnglish
Pages (from-to)589-593
JournalJournal of Geochemical Exploration
Volume69
Issue number70
DOIs
Publication statusPublished - 1 Jan 2000

Keywords

  • Fluid channeling
  • HT-LP metamorphism
  • Magmatic fluids
  • Metasomatism

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