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GEOREF RECORD

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

Shi Guanghai, Zhang Xiaochong, Wang Yu, Li Qiuli, Wu Fuyuan and He Huaiyu
Age determination of oriented rutile inclusions in sapphire and of moonstone from the Mogok metamorphic belt, Myanmar
American Mineralogist (November 2021) 106 (11): 1852-1859

Abstract

The Mogok metamorphic belt (MMB), Myanmar, is one of the most well-known gemological belts on Earth. Previously, (super 40) Ar/ (super 39) Ar, 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 (super 40) Ar/ (super 39) Ar dating of moonstone (antiperthite) in syenites from the MMB yield ages of 13.43 + or - 0.92 and 13.55 + or - 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.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 106
Serial Issue: 11
Title: Age determination of oriented rutile inclusions in sapphire and of moonstone from the Mogok metamorphic belt, Myanmar
Affiliation: China University of Geosciences, State Key Laboratory of Geological Processes and Mineral Resources, Beijing, China
Pages: 1852-1859
Published: 202111
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 63
Accession Number: 2021-077560
Categories: General mineralogyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, sketch maps
N11°49'60" - N22°55'00", E96°19'60" - E96°25'00"
Secondary Affiliation: Chinese Academy of Sciences, Institute of Geology and Geophysics, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202154
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