Details
| Original language | English |
|---|---|
| Article number | 988 |
| Pages (from-to) | 1-17 |
| Number of pages | 17 |
| Journal | Minerals |
| Volume | 10 |
| Issue number | 11 |
| Publication status | Published - 7 Nov 2020 |
Abstract
In the current study, different heavy minerals typical of gold placer deposits were identified by means of micro-Raman spectroscopy, and their chemical composition analyzed and discussed (garnet, kyanite, staurolite, zircon, allanite, monazite, xenotime, rutile, anatase, cassiterite, titanite, barite). Even complex solid solution series, such as those of garnets, can be deciphered with the aid of systematic trends observed in Raman line frequencies. The vi mode in garnets will shift from high to low frequencies as a function of the ionic radius of the X2+ cation, from Mg2+, to Fe2+ and Mn2+, while the presence of Ca2+ will make the band to be shifted strongly to even lower wavenumbers. This approach has successfully been taken to differentiate between polymorph triplets such as kyanite-sillimanite-andalusite and rutile-anatase-brookite. Minerals under consideration with high contents of REE, U and Th are affected by intensive metamictization, particularly zircon and titanite. Raman peak features, such as shape, symmetry and intensity, respond to this radiation damage of the lattice and enable fine-tuning of these heavy minerals, such as in the case of fluorite (fetid fluorite).
Keywords
- Allanite, Garnet, Gold placers, Heavy minerals, Raman spectroscopy, Xenotime, Zircon
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geotechnical Engineering and Engineering Geology
- Earth and Planetary Sciences(all)
- Geology
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In: Minerals, Vol. 10, No. 11, 988, 07.11.2020, p. 1-17.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Micro-Raman—a tool for the heavy mineral analysis of gold placer-type deposits (Pianu Valley, Romania)
AU - Maftei, Andreea Elena
AU - Buzatu, Andrei
AU - Damian, Gheorghe
AU - Buzgar, Nicolae
AU - Dill, Harald G.
AU - Apopei, Andrei Ionut
N1 - Funding Information: This work was supported by a grant of the ?Alexandru Ioan Cuza? University of Iasi, within the Research Grants program, Grant UAIC, code GI-UAIC-2018-02. Funding Information: Funding: This work was supported by a grant of the “Alexandru Ioan Cuza” University of Iasi, within the Research Grants program, Grant UAIC, code GI-UAIC-2018-02. Publisher Copyright: © 2020, MDPI AG. All rights reserved.
PY - 2020/11/7
Y1 - 2020/11/7
N2 - In the current study, different heavy minerals typical of gold placer deposits were identified by means of micro-Raman spectroscopy, and their chemical composition analyzed and discussed (garnet, kyanite, staurolite, zircon, allanite, monazite, xenotime, rutile, anatase, cassiterite, titanite, barite). Even complex solid solution series, such as those of garnets, can be deciphered with the aid of systematic trends observed in Raman line frequencies. The vi mode in garnets will shift from high to low frequencies as a function of the ionic radius of the X2+ cation, from Mg2+, to Fe2+ and Mn2+, while the presence of Ca2+ will make the band to be shifted strongly to even lower wavenumbers. This approach has successfully been taken to differentiate between polymorph triplets such as kyanite-sillimanite-andalusite and rutile-anatase-brookite. Minerals under consideration with high contents of REE, U and Th are affected by intensive metamictization, particularly zircon and titanite. Raman peak features, such as shape, symmetry and intensity, respond to this radiation damage of the lattice and enable fine-tuning of these heavy minerals, such as in the case of fluorite (fetid fluorite).
AB - In the current study, different heavy minerals typical of gold placer deposits were identified by means of micro-Raman spectroscopy, and their chemical composition analyzed and discussed (garnet, kyanite, staurolite, zircon, allanite, monazite, xenotime, rutile, anatase, cassiterite, titanite, barite). Even complex solid solution series, such as those of garnets, can be deciphered with the aid of systematic trends observed in Raman line frequencies. The vi mode in garnets will shift from high to low frequencies as a function of the ionic radius of the X2+ cation, from Mg2+, to Fe2+ and Mn2+, while the presence of Ca2+ will make the band to be shifted strongly to even lower wavenumbers. This approach has successfully been taken to differentiate between polymorph triplets such as kyanite-sillimanite-andalusite and rutile-anatase-brookite. Minerals under consideration with high contents of REE, U and Th are affected by intensive metamictization, particularly zircon and titanite. Raman peak features, such as shape, symmetry and intensity, respond to this radiation damage of the lattice and enable fine-tuning of these heavy minerals, such as in the case of fluorite (fetid fluorite).
KW - Allanite
KW - Garnet
KW - Gold placers
KW - Heavy minerals
KW - Raman spectroscopy
KW - Xenotime
KW - Zircon
UR - http://www.scopus.com/inward/record.url?scp=85095956479&partnerID=8YFLogxK
U2 - 10.3390/min10110988
DO - 10.3390/min10110988
M3 - Article
AN - SCOPUS:85095956479
VL - 10
SP - 1
EP - 17
JO - Minerals
JF - Minerals
SN - 2075-163X
IS - 11
M1 - 988
ER -