dc.date.accessioned | 2019-03-26T11:23:21Z | |
dc.date.available | 2019-03-26T11:23:21Z | |
dc.date.created | 2019-01-17T21:39:49Z | |
dc.date.issued | 2018 | |
dc.identifier.citation | Zeug, M. Nasdala, L. Wanthanachaisaeng, B. Balmer, W.A. Corfu, Fernando Wildner, M. . Blue Zircon from Ratanakiri, Cambodia. Journal of Gemmology. 2018, 36, 112-132 | |
dc.identifier.uri | http://hdl.handle.net/10852/67410 | |
dc.description.abstract | Zircon from Ratanakiri Province, north-eastern Cambodia, is well known in the gem trade for its vivid blue colour that results from heat treatment. The untreated brown material turns blue under reducing conditions at ~900–1,000°C. Ratanakiri zircon is characterised by remarkably low contents of trace elements. In particular, the actinides have low concentrations (e.g. approximately 120 ppm U and 95 ppm Th). Together with the very young age of the zircon (<1 million years [Ma]), this results in an extremely low self-irradiation dose, which in turn is in agreement with its non-radiation-damaged, nearly perfectly crystalline state. The heat treatment, therefore, does not result in detectable changes in the zircon’s structural state. The cause of the blue colour, presumably related to a valence change upon heating in the reducing environment, is still under debate. The absorption of the treated Ratanakiri zircon is decidedly different from that of blue U4+-doped and blue V4+-doped synthetic ZrSiO4. Absorption spectra show a strongly pleochroic band at 18,200– 13,000 cm–1 (corresponding to ~550–770 nm wavelength) that is clearly responsible for the treated blue colour; however, its assignment remains unresolved. | en_US |
dc.language | EN | |
dc.title | Blue Zircon from Ratanakiri, Cambodia | en_US |
dc.type | Journal article | en_US |
dc.creator.author | Zeug, M. | |
dc.creator.author | Nasdala, L. | |
dc.creator.author | Wanthanachaisaeng, B. | |
dc.creator.author | Balmer, W.A. | |
dc.creator.author | Corfu, Fernando | |
dc.creator.author | Wildner, M. | |
cristin.unitcode | 185,15,22,50 | |
cristin.unitname | Seksjon for geologi og geofysikk | |
cristin.ispublished | true | |
cristin.fulltext | original | |
dc.identifier.cristin | 1659800 | |
dc.identifier.bibliographiccitation | info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Gemmology&rft.volume=36&rft.spage=112&rft.date=2018 | |
dc.identifier.jtitle | Journal of Gemmology | |
dc.identifier.volume | 36 | |
dc.identifier.startpage | 112 | |
dc.identifier.endpage | 132 | |
dc.identifier.doi | 10.15506/JoG.2018.36.2.112 | |
dc.identifier.urn | URN:NBN:no-70587 | |
dc.type.document | Tidsskriftartikkel | en_US |
dc.type.peerreviewed | Peer reviewed | |
dc.source.issn | 1355-4565 | |
dc.identifier.fulltext | Fulltext https://www.duo.uio.no/bitstream/handle/10852/67410/1/Zeug_2018_JGe_Ratanakiri-zircon.pdf | |
dc.type.version | PublishedVersion | |
dc.relation.project | NFR/223272 | |