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Diversity in ruby geochemistry and its inclusions: intra- and inter- continental comparisons from Myanmar and Eastern Australia

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Sutherland, FL, Zaw, K ORCID: 0000-0003-0503-3461, Meffre, S ORCID: 0000-0003-2741-6076, Thompson, Jay, Goemann, K ORCID: 0000-0002-8136-3617, Thu, K, Nu, TT, Zin, MM and Harris, SJ 2019 , 'Diversity in ruby geochemistry and its inclusions: intra- and inter- continental comparisons from Myanmar and Eastern Australia' , Minerals, vol. 9, no. 28 , doi: 10.3390/min9010028.

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Abstract

Ruby in diverse geological settings leaves petrogenetic clues, in its zoning, inclusions,trace elements and oxygen isotope values. Rock-hosted and isolated crystals are compared fromMyanmar, SE Asia, and New SouthWales, East Australia. Myanmar ruby typifies metasomatizedand metamorphic settings, while East Australian ruby xenocrysts are derived from basalts thattapped underlying fold belts. The respective suites include homogeneous ruby; bi-colored inner(violet blue) and outer (red) zoned ruby; ruby-sapphirine-spinel composites; pink to red grains andmulti-zoned crystals of red-pink-white-violet (core to rim). Ruby ages were determined by usingU-Pb isotopes in titanite inclusions (Thurein Taung; 32.4 Ma) and zircon inclusions (Mong Hsu;23.9 Ma) and basalt dating in NSW, >60–40 Ma. Trace element oxide plots suggest marble sourcesfor Thurein Taung and Mong Hsu ruby and ultramafic-mafic sources for Mong Hsu (dark cores).NSW rubies suggest metasomatic (Barrington Tops), ultramafic to mafic (Macquarie River) andmetasomatic-magmatic (New England) sources. A previous study showed that Cr/Ga vs. Fe/(V + Ti)plots separate Mong Hsu ruby from other ruby fields, but did not test Mogok ruby. Thurein Taungruby, tested here, plotted separately to Mong Hsu ruby. A Fe-Ga/Mg diagram splits ruby suitesinto various fields (Ga/Mg 6). The diverse results emphasize ruby’s potential for geographic typing.

Item Type: Article
Authors/Creators:Sutherland, FL and Zaw, K and Meffre, S and Thompson, Jay and Goemann, K and Thu, K and Nu, TT and Zin, MM and Harris, SJ
Keywords: ruby, Mogok, Mong Hsu, New South Wales, trace elements, LA-ICP-MS analysis, inclusions, U–Pb age-dating, genetic diversity, geographic typing
Journal or Publication Title: Minerals
Publisher: MDPI AG
ISSN: 2075-163X
DOI / ID Number: 10.3390/min9010028
Copyright Information:

Copyright 2019 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

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