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Natural Mg-Fe clinochlores: enthalpies of formation and dehydroxylation derived from calorimetric study

  • Lyubov P. Ogorodova EMAIL logo , Marina F. Vigasina , Lyubov V. Melchakova , Irina A. Kiseleva , Victoria V. Krupskaya and Igor A. Bryzgalov
Published/Copyright: June 3, 2016
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American Mineralogist
From the journal American Mineralogist Volume 101 Issue 6

Abstract

This paper presents the results of the first experimental thermochemical investigation of two natural trioctahedral chlorites (clinochlores). The study was performed with the help of a high-temperature heat-flux Tian-Calvet microcalorimeter. The samples were characterized by X ray spectroscopy analysis, X ray powder diffraction, thermal analysis, and FTIR spectroscopy. The enthalpies of formation of clinochlores were found using the melt solution calorimetry method to be: –8806 ± 16 kJ/mol for composition (Mg4.9Fe0.32+Al0.8)[Si3.2Al0.8O10](OH)8 and –8748 ± 24 kJ/mol for composition (Mg4.2Fe0.62+Al1.2)[Si2.8Al1.2O10](OH)8. The experimental data for natural samples allowed calculating the enthalpies of formation for end-members and intermediate members of the clinochlore (Mg5Al)[Si3AlO10](OH)8 and chamosite (Fe5Al)[Si3AlO10](OH)8 series. An important feature of the clinochlore structure is the presence of two distinct hydroxyl-containing octahedral layers: the interlayer octahedral sheet and octahedral 2:1 layer; the enthalpies of water removal from these positions in clinochlore structure were determined as: 53 ± 20 kJ/(mol·H2O) and 131 ± 10 kJ/(mol·H2O), respectively. These obtained first thermodynamic characteristics of Mg-Fe clinochlores can be used for quantitative thermodynamic modeling of geological and industrial processes including clinochlores of different composition.

Key words: Clinochlore; chlorite; thermochemistry; microcalorimetry; enthalpy of dehydroxylation; enthalpy of formation

Acknowledgments

We are very grateful to Andrey Yu. Bychkov (M.V. Lomonosov Moscow State University, Geological Faculty) for his fruitful discussion of the results of our thermochemical studies and for his calculation of clinochlore thermal stability. Financial support from the Russian Foundation for Basic Research (projects no. 12-05-00211) is gratefully acknowledged.

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Received: 2015-9-30
Accepted: 2016-1-22
Published Online: 2016-6-3
Published in Print: 2016-6-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2016-5572
Keywords for this article
Clinochlore; chlorite; thermochemistry; microcalorimetry; enthalpy of dehydroxylation; enthalpy of formation

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  1. Invited Centennial Article
  2. On the nature and significance of rarity in mineralogy
  3. Special collection: mechanisms, rates, and timescales of geochemical transport processes in the crust and mantle
  4. Zircon saturation and Zr diffusion in rhyolitic melts, and zircon growth geospeedometer
  5. Review
  6. On silica-rich granitoids and their eruptive equivalents
  7. Special collection: advances in ultrahigh-pressure metamorphism
  8. Discovery of in situ super-reducing, ultrahigh-pressure phases in the Luobusa ophiolitic chromitites, Tibet: new insights into the deep upper mantle and mantle transition zone
  9. Special collection: from magmas to ore deposits
  10. Uraninite from the Olympic Dam IOCG-U-Ag deposit: linking textural and compositional variation to temporal evolution
  11. Special collection: from magmas to ore deposits
  12. A story of olivine from the McIvor Hill complex (Tasmania, Australia): Clues to the origin of the Avebury metasomatic Ni sulfide deposit
  13. Special collection: perspectives on origins and evolution of crustal magmas
  14. The origin of extensive Neoarchean high-silica batholiths and the nature of intrusive complements to silicic ignimbrites: Insights from the Wyoming batholith, U.S.A.
  15. Special collection: perspectives on origins and evolution of crustal magmas
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