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Minerals 2019, 9(1), 28; https://doi.org/10.3390/min9010028

Diversity in Ruby Geochemistry and Its Inclusions: Intra- and Inter- Continental Comparisons from Myanmar and Eastern Australia

1
Mineralogy & Petrology, Geosciences, Australian Museum, 1 William Street, Sydney, NSW 2010, Australia
2
CODES Centre of Ore Deposit and Earth Sciences, University of Tasmania, Hobart, Tas 7001, Australia
3
Central Science Laboratory, University of Tasmania, Hobart, Tas 7001, Australia
4
Geology Department, Yangon University, Yangon 11041, Myanmar
5
Geology Department, Mandalay University, Mandalay 05032, Myanmar
6
Geology Programme, Faculty of Science and Technology, The National University of Malaysia (UKM), Selangor 43600, Malaysia
7
School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052, Australia
*
Author to whom correspondence should be addressed.
Received: 28 November 2018 / Revised: 22 December 2018 / Accepted: 25 December 2018 / Published: 5 January 2019
(This article belongs to the Special Issue Mineralogy and Geochemistry of Gems)
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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 from Myanmar, SE Asia, and New South Wales, East Australia. Myanmar ruby typifies metasomatized and metamorphic settings, while East Australian ruby xenocrysts are derived from basalts that tapped 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 and multi-zoned crystals of red-pink-white-violet (core to rim). Ruby ages were determined by using U-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 sources for 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) and metasomatic-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 Taung ruby, tested here, plotted separately to Mong Hsu ruby. A Fe-Ga/Mg diagram splits ruby suites into various fields (Ga/Mg < 3), except for magmatic input into rare Mogok and Australian ruby (Ga/Mg > 6). The diverse results emphasize ruby’s potential for geographic typing. View Full-Text
Keywords: ruby; Mogok; Mong Hsu; New South Wales; trace elements; LA-ICP-MS analysis; inclusions; U–Pb age-dating; genetic diversity; geographic typing ruby; Mogok; Mong Hsu; New South Wales; trace elements; LA-ICP-MS analysis; inclusions; U–Pb age-dating; genetic diversity; geographic typing
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Sutherland, F.L.; Zaw, K.; Meffre, S.; Thompson, J.; Goemann, K.; Thu, K.; Nu, T.T.; Zin, M.M.; Harris, S.J. Diversity in Ruby Geochemistry and Its Inclusions: Intra- and Inter- Continental Comparisons from Myanmar and Eastern Australia. Minerals 2019, 9, 28.

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