Characterization of the Composition of Fluid Inclusions in Minerals By H-1-nmr
(1994) The American Mineralogist (Print) : an international journal of earth and planetary materials — Vol. 79, n° 7-8, p. 712-718 (1994)
Files
No attached file found for this publication.
Details
- Authors
- Abstract
- Synthetic (sylvite) and natural (quartz) crystals rich in aqueous and oil fluid inclusions have been studied by H-1 NMR spectroscopy. Separate crystals of each sample were analyzed using the MAS (magic angle spinning) NMR technique with a 90-MHz Bruker CXP spectrometer. The H-1 NMR spectra from synthetic inclusions of toluene and isobutylbenzene show H2O and hydrocarbon contributions in separated spectral regions. The integrated intensities of each proton peak of the hydrocarbon fraction are in agreement with theoretical values. The sylvite crystals synthesized with an aliphatic natural oil have a H-1 MAS NMR spectrum showing the presence of H2O, methyl, and methylene groups. For the same line broadening, the spectra recorded on free oil and on inclusions are similar. Ratios of H-1(ali)/H-1(aro), CH2/CH3, and CH/SIGMAC(ali) can be calculated. Differences between the ratios measured on free oil and inclusions are due to poor resolution and to peak overlapping. The hydrocarbon-H2O volumetric ratio varies from 3 to 10 vol% and is close to the measured value of 4 vol% of hydrocarbon. NMR has also been applied to natural inclusions in quartz crystals from the North Sea basin. Methane and aliphatic peaks have been detected, but no aromatic contribution has been observed. A methane concentration of 3.6 and 1.7 mol/L is estimated considering a pseudoaliphatic composition of n-nonane deduced from infrared data.
- Affiliations
Citations
Dereppe, J.-M., Pironon, J., & Moreaux, C. (1994). Characterization of the Composition of Fluid Inclusions in Minerals By H-1-nmr. The American Mineralogist (Print) : an international journal of earth and planetary materials, 79(7-8), 712-718. https://hdl.handle.net/2078.5/85107 (Original work published 1994)