IR spectroscopy of multiple frustrated total internal reflection   as a way to study the typomorphism of silica minerals in gold deposits

G. A. Yurgenson; E. V. Mironova

IR spectroscopy of multiple frustrated total internal reflection as a way to study the typomorphism of silica minerals in gold deposits

G. A. Yurgenson, E. V. Mironova

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Abstract

A study of IR-spectra of multiple frustrated total internal reflection (MFTIR) of silica mineral aggregates containing various amounts of opal, chalcedony and quartz from barren volcanics and deposits of shallow gold-silver and medium-depth gold-quartz and gold-sulfide-quartz formations was carried out. Clear differences in the IR-spectra of MFTIR of opal-chalcedony-quartz aggregates from barren volcanics and the superore zone of the deposit of shallow gold-silver formation were revealed, consisting in the splitting of K₃ absorption band (475–490 cm^–1 into two peaks at 470–484 and 492–500 cm^–1), determined by the ratio of the contents of opal, chalcedony and quartz. A connection has been revealed between the variability of the ratios of the reflection bands intensities in the spectra with the values of the degree of the crystalline structure perfection and the crystallinity index of silica minerals and the depth of their formation. The indicated features of silica mineral aggregates can be used as typomorphic features for determination of their belonging to ore deposits of the shallow gold-silver formation and assessment of the erosional cut of such ore deposits.

Keywords

opal, chalcedony, quartz, vein quartz, IR-spectrum of MFTIR, gold deposit, Transbaikalia

About the Authors

G. A. Yurgenson

Institute of Natural Resources, Ecology and Cryology of Siberian Branch, Russian Academy of Sciences
Russian Federation

Chita

E. V. Mironova

Institute of Natural Resources, Ecology and Cryology of Siberian Branch, Russian Academy of Sciences
Russian Federation

Chita

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Review

For citations:

Yurgenson G.A., Mironova E.V. IR spectroscopy of multiple frustrated total internal reflection as a way to study the typomorphism of silica minerals in gold deposits. Zhurnal Prikladnoii Spektroskopii. 2024;91(6):821-825. (In Russ.)

ISSN 0514-7506 (Print)

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Zhurnal Prikladnoii Spektroskopii