NDLI: The experimental incorporation of Fe into talc: a study using X-ray diffraction, Fourier transform infrared spectroscopy, and Mössbauer spectroscopy

Content Provider	Springer Nature Link
Author	Corona, Juan Carlos Jenkins, David M. Dyar, M. Darby
Copyright Year	2015
Abstract	Talc is a common Mg-rich trioctahedral layer silicate that occurs both as a primary and as a secondary mineral in a wide range of rock types. Substitution of Fe2+ for Mg is fairly extensive in certain rock types, particularly banded iron formations, yet there is relatively limited fundamental crystal-chemical information on this substitution. This study is an experimental investigation of Fe2+ substitution for Mg using X-ray diffraction, infrared spectroscopy, and Mössbauer spectroscopy. Talc was synthesized in 0.5 Fe cation [0.17 X Fe, X Fe = Fe/(Fe + Mg)] increments along the join Mg3Si4O10(OH)2–Fe3Si4O10(OH)2 over the range of 350–700 °C, oxygen fugacities (fO2) from ~Ni–NiO to 3.3 log(fO2) units below Ni–NiO, and at a pressure of 0.2 GPa. High yields of talc without any coexisting Fe-bearing phases were obtained up to 0.33 X Fe, beyond which talc coexisted with fayalitic olivine, magnetite, or both, indicating saturation in Fe for syntheses along the talc join. Infrared spectroscopy was used to determine independently the X Fe of talc, showing a deviation from the observed and expected composition starting at X Fe of 0.37 ± 0.03. Minor additional solid solution occurred beyond this to a maximum X Fe solubility of 0.50. Mössbauer spectroscopy indicated the dominance of octahedral Fe2+ in talc with octahedral Fe3+ ranging from 2.9 to 21.5 at.%, depending on the ambient fO2. X-ray diffraction analysis did not confirm the strong dependence of the interplanar spacing d 003 on the oxygen fugacity as reported earlier in the literature. This study provides the first experimentally constrained unit-cell volume of 474.4 ± 2.2 Å3 (142.6 ± 0.7 cm3/mol) for the end-member Fe3Si4O10(OH)2. The observed upper limit of iron solubility in talc of about 0.5 X Fe agrees with the majority of analyses reported for talc, and that values above this are attributed to intergrowths of talc with the structurally distinct minnesotaite.
Starting Page	1
Ending Page	15
Page Count	15
File Format	PDF
ISSN	00107999
Journal	Contributions to Mineralogy and Petrology
Volume Number	170
Issue Number	3
e-ISSN	14320967
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-09-01
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Talc Minnesotaite Banded iron formations Mössbauer spectroscopy Synthetic talc Ferric iron Solid solution Geology Mineral Resources Mineralogy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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