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Ammonium vermiculite in schists from the Betic Cordillera (Spain)

  • M.D. Ruiz Cruz EMAIL logo
Published/Copyright: April 2, 2015
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American Mineralogist
From the journal American Mineralogist Volume 96 Issue 11-12

Abstract

NH4-bearing phases from pre-Permian schists of the Internal Zones of the Betic Cordillera (Spain) have been characterized by X‑ray diffraction, differential thermal analysis and thermogravimetry, infrared spectroscopy, and transmission-analytical electron microscopy. The content and distribution of NH4 in these phases have been estimated by combining elemental analysis of N with mineral quantification based on X‑ray diffraction, whole-rock composition, and electron microprobe data. The obtained results indicate that the NH4 content in vermiculite ranges between ~0.5 and ~1.0 (wt%), leading to terms with NH4 > K in the interlayer. The NH4 content is <0.30 (wt%) in biotite from underlying schists. Muscovite shows very low NH4 contents (0.04 wt%) through the complete sequence. We interpret that, initially contained in low-grade dioctahedral mica, NH4 was incorporated in the structure of the trioctahedral phases formed at increasing metamorphic conditions. The entry of NH4 in the interlayer was favored in chlorite:vermiculite mixed-layered structures and transitional phases with vacancies in the A site (vermiculite) and weak cohesion between layers. NH4 appears to favor the formation of intermediate phases instead the direct transformation of chlorite to biotite.

Keywords : Ammonium mica; biotite; Betic Cordillera; Spain; muscovite; suhailite; vermiculite
Received: 2011-2-3
Accepted: 2011-6-24
Published Online: 2015-4-2
Published in Print: 2011-11-1

© 2015 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am.2011.3799
Keywords for this article
Ammonium mica; biotite; Betic Cordillera; Spain; muscovite; suhailite; vermiculite

Articles in the same Issue

  1. In situ stress-strain measurements in a deformation-DIA apparatus at P-T conditions of the upper part of the mantle transition zone
  2. Element diffusion rates in lunar granulitic breccias: Evidence for contact metamorphism on the Moon
  3. The crystal structure of franckeite, Pb21.7Sn9.3Fe4.0Sb8.1S56.9
  4. Ammonium vermiculite in schists from the Betic Cordillera (Spain)
  5. Natrolite is not a “soda-stone” anymore: Structural study of alkali (Li+), alkaline-earth (Ca2+, Sr2+, Ba2+) and heavy metal (Cd2+, Pb2+, Ag+) cation-exchanged natrolites
  6. Analysis of hydrogen in olivine by SIMS: Evaluation of standards and protocol
  7. New accurate elastic parameters for the forsterite-fayalite solid solution
  8. In-situ mid/far micro-FTIR spectroscopy to trace pressure-induced phase transitions in strontium feldspar and wadsleyite
  9. Structural study of the coherent dehydration of wadsleyite
  10. An atomic force microscopy study of diamond dissolution features: The effect of H2O and CO2 in the fluid on diamond morphology
  11. Unraveling the stacking structure in tubular halloysite using a new TEM with computer-assisted minimal-dose system
  12. High-pressure structural behavior of α-Fe2O3 studied by single-crystal X-ray diffraction and synchrotron radiation up to 25 GPa
  13. The IR vibrational properties of six members of the garnet family: A quantum mechanical ab initio study
  14. On the presence of OH defects in the zircon-type phosphate mineral xenotime, (Y,REE)PO4
  15. Cesium and strontium incorporation into zeolite-type phases during homogeneous nucleation from caustic solutions
  16. Electrical conductivity of albite at high temperatures and high pressures
  17. Crystal-chemical and structural characterization of fluorapatites in ejecta from Somma-Vesuvius volcanic complex
  18. In situ ion-microprobe determination of trace element partition coefficients for hornblende, plagioclase, orthopyroxene, and apatite in equilibrium with natural rhyolitic glass, Little Glass Mountain Rhyolite, California
  19. In situ FTIR investigations at varying temperatures on hydrous components in rutile
  20. Methods to analyze metastable and microparticulate hydrated and hydrous iron sulfate minerals
  21. Crystal chemistry of Ti-rich ferriallanite-(Ce) from Cape Ashizuri, Shikoku Island, Japan
  22. Replacement of pyrrhotite by pyrite and marcasite under hydrothermal conditions up to 220 °C: An experimental study of reaction textures and mechanisms
  23. Argandite, Mn7(VO4)2(OH)8, the V analogue of allactite from the metamorphosed Mn ores at Pipji, Turtmann Valley, Switzerland
  24. Murchisite, Cr5S6, a new mineral from the Murchison meteorite
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