Startseite Age determination of oriented rutile inclusions in sapphire and of moonstone from the Mogok metamorphic belt, Myanmar
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Age determination of oriented rutile inclusions in sapphire and of moonstone from the Mogok metamorphic belt, Myanmar

  • Guanghai Shi , Xiaochong Zhang , Yu Wang , Qiuli Li , Fuyuan Wu und Huaiyu He
Veröffentlicht/Copyright: 29. Oktober 2021
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Abstract

The Mogok metamorphic belt (MMB), Myanmar, is one of the most well-known gemological belts on Earth. Previously, 40Ar/39Ar, K-Ar, and U-Pb dating have yielded Jurassic-Miocene magmatic and metamorphic ages of the MMB and adjacent areas; however, no reported age data are closely related to the sapphire and moonstone deposits. Secondary ion mass spectrometry (SIMS) U-Pb dating of acicular rutile inclusions in sapphire and furnace step-heating 40Ar/39Ar dating of moonstone (antiperthite) in syenites from the MMB yield ages of 13.43 ± 0.92 and 13.55 ± 0.08 Ma, respectively, indicating both Myanmar sapphire and moonstone formed at the same time, and the ages are the youngest published in the region. The ages provide insight into the complex histories and processes of magmatism and metamorphism of the MMB, the formation of gemstone species in this belt, and the collision between India and Asia. In addition, our high field strength element data for the oriented rutile inclusions suggest an origin by co-precipitation rather than exsolution. In situ age determination of this nature is particularly significant since rutile inclusions in other gemstones, such as rubies, can be used to help constrain the geological history of their host rocks elsewhere.

Funding statement: This work was supported by the National Science Foundation of China (41688103, 41773044), and by the Second Tibetan Plateau Scientific Expedition and Research Program (STHP) Grant No. 2019QZKK0802.

Acknowledgments

We appreciate R.X. Zhu and T.T. Nyunt for their kind supports during the field trip in Myanmar, J.W. Yin and P.X. Lai for their help with EMP analyses, and X.X. Ling, Y. Liu, T. Zhou, and H.X. Ma for SIMS and Raman analyzes. Constructive comments and suggestions by F.Z. Teng and two anonymous referees are gratefully acknowledged.

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Received: 2020-02-23
Accepted: 2020-12-03
Published Online: 2021-10-29
Published in Print: 2021-11-25

© 2021 Mineralogical Society of America

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