Raman microspectroscopy of garnets from S-fibulae from the archaeological site Lajh (Slovenia)

Kos, Saša (avtor), Dolenec, Matej (avtor), Lux, Judita (avtor), Dolenec, Sabina (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: garnets, inclusions, S-fibulae, Late Antiquity, provenance, Raman microspectroscopy, XRF spectroscopy
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: NTF - Naravoslovnotehniška fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2020
• Št. strani: 21 str.
• Številčenje: Vol. 10, iss. 4, art. 325
• PID: 20.500.12556/RUL-128700
• UDK: 55
• ISSN pri članku: 2075-163X
• DOI: 10.3390/min10040325
• COBISS.SI-ID: 1568606
• Datum objave v RUL: 23.07.2021

Gradivo je del revije

• Naslov: Minerals
• Skrajšan naslov: Minerals
• Založnik: MDPI AG
• ISSN: 2075-163X
• COBISS.SI-ID: 519985177

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
• Začetek licenciranja: 04.04.2020

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: granati, vključki, S-fibule, pozna antika, provenienca, ramanska mikrospektroskopija, spektroskopija XRF

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0273
• Naslov: Gradbeni objekti in materiali

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P1-0195
• Naslov: Geookolje in geomateriali