Giuliani, G, Dubessy, J, Banks, DA et al. (2 more authors) (2015) Fluid inclusions in ruby from Asian marble deposits: genetic implications. European Journal of Mineralogy, 27 (3). 393 - 404. ISSN 0935-1221
Abstract
Primary fluid inclusion (FI) assemblages in ruby from marble at Mogok and fifteen other deposits from central and Southeast Asia were studied by microthermometry, Raman spectroscopy and crush-leach analysis. Microthermometry combined with Raman spectroscopy investigations of primary FI in Mogok rubies indicated the simultaneous trapping of carbonic FI in the system CO2–H2S (± COS ± S8) and multi-solid carbonic FI in the system Na–K–Ca–CO3–SO4–NO3–Cl–F ±(CO2–H2S). The multiple solids are mainly mixtures of Na-Ca-Al carbonates such as shortite and dawsonite, sulphates, phosphates, nitrates, fluorides, and chlorides such as halite. They represent the trapped recrystallised residues of molten salts formed during the metamorphism of evaporite lenses (chlorides and sulphates) intercalated in the carbonate rocks. Raman spectroscopy of solids in FI from all Asian rubies hosted in marbles identified both (i) accidentally trapped minerals mainly calcite, dolomite and rutile, and (ii) daughter phases, i.e., native sulphur, diaspore and boehmite, and Na-K-Ca chlorides, anhydrite, dawsonite, shortite and fluorides. Crush-leach analysis of ruby crystals identified chloride as the dominant anion, but sulphate and nitrate are present at only slightly lower concentrations, whereas they are the dominant species in some Pakistani deposits. The Na–K–Ca–Li–CO3–SO4–NO3–Cl–F molten salt assemblages and the presence of nitrate and phosphate indicate the deposition of the original sediments in a coastal sabkha with ephemeral marine and continental water flooding. Input of V- and Cr-bearing argillite to the salty mudflats insured the formation of rubies in marble during Cenozoic metamorphism.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Keywords: | ruby in marble; meta-evaporites; Asia; microthermometry; Raman spectroscopy; crush-leach method; fluid inclusion; molten salts; Na-K-Ca-Li-CO3-SO4-NO3-Cl-F system |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Inst of Geophysics and Tectonics (IGT) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 01 Oct 2015 15:02 |
Last Modified: | 20 Dec 2015 20:26 |
Published Version: | http://dx.doi.org/10.1127/ejm/2015/0027-2442 |
Status: | Published |
Publisher: | E Schweizerbart Science Publishers |
Identification Number: | 10.1127/ejm/2015/0027-2442 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:89164 |