Please use this identifier to cite or link to this item: https://dspace.ctu.edu.vn/jspui/handle/123456789/59067
Title: Fluid characteristics from shallow magmatic environments: A contribution to danburite bearing Luc Yen pegmatites, northern Vietnam
Authors: Kreann, Kurt
Le, Thi Thu Huong
Keywords: Pegmatites
Danburite
Fluid inclusions
Necking down
Luc Yen
Issue Date: 2019
Series/Report no.: Vietnam Journal of Earth Sciences;Vol. 41, No. 01 .- P.01–09
Abstract: Danburite as a member of the Luc Yen pegmatite mineral assemblage has been studied using fluid inclusion microthennomctry and Raman spectroscopy. Data characterize well-preserved fluid inclusions which originate from primary large tubular incl usions 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 danburitc). Inclusions consist of pure CO₂ and H₂O with additional NaCl ± KCl comprising a salinity of about 4.5 mass%. Internal fluid inclusion pressures as well as bulk clusion densities have been calculated using the formi diad split method of pure CO₂ at clathrate melting temperatures of the system and total homogenization temperatures, respectively. Mean internal pressures of ca. 4.5 MPa as well as a bulk density around 0.60 g/cm³ represent a low-dense fluid with XH₂O~0.86 and XCO₂~0.14 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.
URI: https://dspace.ctu.edu.vn/jspui/handle/123456789/59067
ISSN: 0866-7187
Appears in Collections:Vietnam journal of Earth sciences

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