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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2018: 2.55

SCImago Journal Rank (SJR) 2018: 1.355
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1945-3027
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Volume 101, Issue 6

Issues

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

Lyubov P. Ogorodova
  • Corresponding author
  • Geological Faculty, M.V. Lomonosov Moscow State University, Leninskie Gory, Moscow 119234, Russia
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/ Marina F. Vigasina
  • Geological Faculty, M.V. Lomonosov Moscow State University, Leninskie Gory, Moscow 119234, Russia
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/ Lyubov V. Melchakova
  • Geological Faculty, M.V. Lomonosov Moscow State University, Leninskie Gory, Moscow 119234, Russia
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/ Irina A. Kiseleva
  • Geological Faculty, M.V. Lomonosov Moscow State University, Leninskie Gory, Moscow 119234, Russia
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/ Victoria V. Krupskaya
  • Geological Faculty, M.V. Lomonosov Moscow State University, Leninskie Gory, Moscow 119234, Russia
  • Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry RAS, Staromonetnii lane, 35, Moscow 109017, Russia
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/ Igor A. Bryzgalov
  • Geological Faculty, M.V. Lomonosov Moscow State University, Leninskie Gory, Moscow 119234, Russia
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Published Online: 2016-06-03 | DOI: https://doi.org/10.2138/am-2016-5572

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

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About the article

Received: 2015-09-30

Accepted: 2016-01-22

Published Online: 2016-06-03

Published in Print: 2016-06-01


Citation Information: American Mineralogist, Volume 101, Issue 6, Pages 1431–1437, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2016-5572.

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© 2016 by Walter de Gruyter Berlin/Boston.

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