U-Pb Ages of Zircon Inclusions in Sapphires from Ratnapura and Balagoda (Sri Lanka) and Implications for Geographic Origin

Article Article scientifique Article U-Pb Ages of Zircon Inclusions in Sapphires from Ratnapura and Balagoda (Sri Lanka) and Implications for Geographic Origin eng 2019 author Elmaleh Emilie 693733 author Schmidt Susanne Theodora 134143 author Karampelas Stefanos author Link Klemens author Kiefert Lore author Suessenberger Annette 816899 author Paul André 18-28 10.5741/GEMS.55.1.18 0016-626X Five sapphires from the secondary placer deposits of Ratnapura and Balangoda in Sri Lanka were classified as being of metamorphic/metasomatic/non-basalt-related origin based on trace-element analysis (LA-ICP-MS) and inclusion characterization. Two sapphires—one from each deposit—contained suitable zircon inclusions that were dated using the LA-ICP-MS method. They yielded U-Pb ages of approximately 549 Ma. The results suggest that the zircon enclosed in the sapphires probably formed in a high-temperature event at the end of the Precambrian granulite facies metamorphism of the ancient Gondwana continent and that this event coincides with the crystallization of the sapphires. The metamorphic character of these sapphires is confirmed from the traceelement composition as well as the solid- and liquid-phase inclusions. Dewey 550 42 Département des sciences de la Terre 154 false Gems and Gemology Spring 1726070b-9a4a-45be-9e58-79a3f3cd8011 Article (Published version) Restricted SP19_Schmidt.pdf 512588 application/pdf restrictedAccess Faculté des sciences / Section des sciences de la Terre et de l'Environnement / Département des sciences de la Terre

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U-Pb Ages of Zircon Inclusions in Sapphires from Ratnapura and Balagoda (Sri Lanka) and Implications for Geographic Origin	Gems and Gemology			2019	474	2

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Elmaleh, Emilie