Startseite Identifying xenocrystic tourmaline in Himalayan leucogranites
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Identifying xenocrystic tourmaline in Himalayan leucogranites

  • Jinsheng Han , Huayong Chen , Haijun Xu , Olivier Nadeau und Chang Xu
Veröffentlicht/Copyright: 10. Juli 2023
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Abstract

Tourmaline is a common autocrystic mineral in granitic and pegmatitic rocks that records valuable information on the physicochemical evolution of magmas. However, xenocrystic tourmaline that does not crystallize from host magmas is also common but seldom reported and notoriously difficult to identify. Here, autocrystic (Tur G) and xenocrystic (Tur P) tourmalines are identified in two-mica granites and granitic pegmatites from the Cuonadong leucogranites, eastern Himalaya. Electron backscatter diffraction (EBSD), coupled with electron-probe micro-analysis (EPMA) and laser ablation ICP-MS analyses (LA-ICP-MS), is used to discriminate xenocrystic from autocrystic tourmaline. Although both tourmalines have slightly different chemical compositions, the differences are insufficient to permit unambiguous discrimination. However, EBSD systematically shows complex intra-crystalline orientations and deformation xenocrystic grains, and undeformed crystal lattices are predominant in autocrystic grains. EBSD could be a useful tool to identify the origin of tourmaline in granitic rocks, particularly when geochemical analyses and/or geochronological measurements are inconclusive.

Funding statement: This study was funded by the National Natural Science Foundation of China (41725009, 42173068), the Fundamental Research Funds for the Central Universities (CUG2106201), China University of Geosciences (Wuhan), and the Fundamental and Applied Fundamental Research Major Program of Guangdong Province (2019B030302013).

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Received: 2022-05-30
Accepted: 2022-09-06
Published Online: 2023-07-10
Published in Print: 2023-07-26

© 2023 by Mineralogical Society of America

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