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Characterisation and genesis of sapphires from the Yenya-U area, Thabeikkyin township, Mandalay region, Myanmar

Citation

Phyu, KM and Zaw, K and Mernagh, TP and Aung, TZ, Characterisation and genesis of sapphires from the Yenya-U area, Thabeikkyin township, Mandalay region, Myanmar, Journal of Gemmology, 37, (8) pp. 802-815. ISSN 1355-4565 (2021) [Refereed Article]

Copyright Statement

2021 Gem-A (The Gemmological Association of Great Britain).

DOI: doi:10.15506/JoG.2021.37.8.802

Abstract

The Yenya-U area in the Mandalay region of central Myanmar hosts two primary sapphire deposits, at Kyauk-tagar and Kyar-gaung. The sapphires form disseminated crystals within syenite pegmatite and nepheline syenite, respectively. Kyar-gaung is a source of relatively large crystals (up to 12 g) that are translucent to opaque, while Kyauk-tagar produces fine-quality vivid-blue sapphires in smaller sizes (up to 0.4 g). Alluvial deposits in the region yield high-quality sapphires of various colours (including colourless, yellow, purple, pink, greenish blue and blue), as well as quartz, topaz, spinel, garnet, zircon, tourmaline and fluorite. The studied Yenya-U sapphires contained solid inclusions of albite, biotite, graphite, melanophlogite and diaspore. In addition, pennantite is reported here for the first time as an inclusion in corundum. CO2-rich fluid inclusions were commonly observed in most of the sapphires. Trace-element analyses of the sapphires are consistent with a metamorphic- metasomatic origin, mostly accompanied by desilicification processes.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Mineralogy and crystallography
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Zaw, K (Professor Khin Zaw)
ID Code:152754
Year Published:2021
Deposited By:Research Performance and Analysis
Deposited On:2022-08-24
Last Modified:2022-09-13
Downloads:0

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