TAILIEUCHUNG - Fluid characteristics from shallow magmatic environments: A contribution to danburite bearing Luc Yen pegmatites, northern Vietnam

Danburite as a member of the Luc Yen pegmatite mineral assemblage has been studied using fluid inclusion microthermometry and Raman spectroscopy. Data characterize well-preserved fluid inclusions which originate from primary large tubular inclusions as result of necking down. Same modifications underwent a second inclusion generation that evolved during healing of a later crack. Both generations of fluid inclusions show the same chemistry (H2O-CO2) characterizing 3-phase inclusions with additional solids (calcite, sassolite and danburite). | Vietnam Journal of Earth Sciences 41 1 1-9 Doi 0866-7187 41 1 13541 VAST Vietnam Academy of Science and Technology Vietnam Journal of Earth Sciences http jse Fluid characteristics from shallow magmatic environments A contribution to danburite bearing Luc Yen pegmatites northern Vietnam Kurt Krenn1 Le Thi Thu Huong1-2 NAWI Graz Geocenter University of Graz Graz A-8010 Austria 2Zeichenakademie Hanau Akademiestr. 52 D- 63450 Hanau Germany Received 3 September 2018 Received in revised form 1 October 2018 Accepted 7 January 2019 ABSTRACT Danburite as a member of the Luc Yen pegmatite mineral assemblage has been studied using fluid inclusion microthermometry and Raman spectroscopy. Data characterize well-preserved fluid inclusions which originate from primary large tubular inclusions as result of necking down. Same modifications underwent a second inclusion generation that evolved during healing of a later crack. Both generations of fluid inclusions show the same chemistry H2O-CO2 characterizing 3-phase inclusions with additional solids calcite sassolite and danburite . Inclusions consist of pure co2 and H2O with additional NaCl KC1 comprising a salinity of about mass . Internal fluid inclusion pressures as well as bulk inclusion densities have been calculated using the fermi diad split method of pure co2 at clathrate melting temperatures of the system and total homogenization temperatures respectively. Mean internal pressures of ca. MPa as well as a bulk density around g cm3 represent a low-dense fluid with XH2O and XCO2 in composition that was present during formation of danburite. Data characterize danburite as a late stage crystallization member of the pegmatite in a shallow magmatic environment. Keywords . Pegmatites danburite fluid inclusions necking down Luc Yen. 2019 Vietnam Academy of Science and Technology 1. Introduction and Geology The Luc Yen mining area in northern Vietnam is a very productive gem .

• Địa Lý
• Vietnam journal of earth sciences
• Fluid characteristics from shallow magmatic environments
• Contribution to danburite bearing Luc Yen pegmatites
• Shallow magmatic environments
• Fluid inclusions show the same chemistry
• General characteristics of rare earth
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