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Raman microspectroscopy of garnets from S-fibulae from the archaeological site Lajh (Slovenia)
ID
Kos, Saša
(
Author
),
ID
Dolenec, Matej
(
Author
),
ID
Lux, Judita
(
Author
),
ID
Dolenec, Sabina
(
Author
)
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https://www.mdpi.com/2075-163X/10/4/325
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Abstract
Garnets (19 pieces) of Late Antique S-fibulae from the archaeological site at Lajh-Kranj (Slovenia) were analysed with Raman microspectroscopy to obtain their mineral characteristic, including inclusion assemblage. Most garnets were determined as almandines Type I of pyralspite solid solution series; however, three garnets showed a higher Mg, Mn and Ca contents and were determined as almandines Type II. Most significant Raman bands were determined in the range of 169–173 cm$^−$$^1$ (T(X$^2$$^+$)), 346–352 cm$^−$$^1$ (R(SiO$_4$)), 557–559 cm$^−$$^1$ (ν$_2$), 633–637 cm$^−$$^1$ (ν$_4$), 917–919 cm$^−$$^1$ (ν$_1$), and 1042–1045 cm$^−$$^1$ (ν$_3$). Shifting of certain Raman bands toward higher frequencies was the result of an increase of the Mg content in the garnet composition, which also indicates the presence of pyrope end member in solid garnet solutions. Inclusions of apatite, quartz, mica, magnetite, ilmenite, as well as inclusions with pleochroic or radiation halo and tension fissures (zircon), were found in most of the garnets. Rutile and sillimanite were found only in garnets with the highest pyrope content. Spherical inclusions were also observed in two garnets, which may indicate the presence of melt or gas residues. The determined inclusion assemblage indicates the formation of garnets during medium- to high-grade metamorphism of amphibolite or granulite facies. According to earlier investigations of the garnets from Late Antique jewellery, the investigated garnets are believed to originate from India.
Language:
English
Keywords:
garnets
,
inclusions
,
S-fibulae
,
Late Antiquity
,
provenance
,
Raman microspectroscopy
,
XRF spectroscopy
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
NTF - Faculty of Natural Sciences and Engineering
Publication status:
Published
Publication version:
Version of Record
Year:
2020
Number of pages:
21 str.
Numbering:
Vol. 10, iss. 4, art. 325
PID:
20.500.12556/RUL-128700
UDC:
55
ISSN on article:
2075-163X
DOI:
10.3390/min10040325
COBISS.SI-ID:
1568606
Publication date in RUL:
23.07.2021
Views:
1464
Downloads:
234
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Record is a part of a journal
Title:
Minerals
Shortened title:
Minerals
Publisher:
MDPI AG
ISSN:
2075-163X
COBISS.SI-ID:
519985177
Licences
License:
CC BY 4.0, Creative Commons Attribution 4.0 International
Link:
http://creativecommons.org/licenses/by/4.0/
Description:
This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:
04.04.2020
Secondary language
Language:
Slovenian
Keywords:
granati
,
vključki
,
S-fibule
,
pozna antika
,
provenienca
,
ramanska mikrospektroskopija
,
spektroskopija XRF
Projects
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0273
Name:
Gradbeni objekti in materiali
Funder:
ARRS - Slovenian Research Agency
Project number:
P1-0195
Name:
Geookolje in geomateriali
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