© 2012 HORIBA Scientific. All rights reserved. Applications of Raman microspectroscopy to fluid inclusions phase identification. S. Mamedov *, R. S. Darling.

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Presentation transcript:

© 2012 HORIBA Scientific. All rights reserved. Applications of Raman microspectroscopy to fluid inclusions phase identification. S. Mamedov *, R. S. Darling ** *Horiba Scientific, Edison, NJ, USA **SUNY Cortland, Cortland, USA

© 2012 HORIBA Scientific. All rights reserved.  Provide identification of molecules in inclusions such as CO 2, CH 4, N 2, -SH, H 2 O as an aid to understanding the geochemistry of rock formation as it evolved.  Calibrated relative intensities can provide concentration ratios.  Peak shifts indicate pressure of inclusion.  Maps and depth profiles provide insight into the structure of the inclusion, but are susceptible to artifacts due to the instability in the position of the bubbles. Information from Raman Spectroscopy of Fluid Inclusions

© 2012 HORIBA Scientific. All rights reserved. Experimental Set Up Laser – 532 nm, 25 mW Objective – Olympus x100, N.A. 0.9 Mapping step size – 0.1 microns

© 2012 HORIBA Scientific. All rights reserved. Quartz, cristobalite and amorphous SiO 2 Raman spectra of SiO 2 Intensity

© 2012 HORIBA Scientific. All rights reserved. Image of the box vein cavities (now in the NYS museum collection); Source of photo: Dale, N.C., 1924, The box-vein of Lyonsdale, Lewis County, N.Y., New York State Museum Bulletin 251. The quartz-lined cavities contain the secondary CH 4 inclusions we analyzed. Box vein location in northern NYS. Yellow are Grenville metamorphic & igneous rocks of the Adirondacks, Blue & purple are lower-middle Paleozoic sedimentary rocks.

© 2012 HORIBA Scientific. All rights reserved. Inclusion 1

© 2012 HORIBA Scientific. All rights reserved. Inclusion 1 CH 4 N2N2 SiO 2 Raman spectrum in the center of the inclusion. Laser 532 nm, confocal hole 1000 microns = spectrum from full depth of inclusion.

© 2012 HORIBA Scientific. All rights reserved. Inclusion 1 – distribution of methane, carbon and SiO 2 Red – CH 4 Green – SiO 2 Blue - carbon

© 2012 HORIBA Scientific. All rights reserved. Red – CH 4 Green – SiO 2 Blue - carbon Inclusion 1 – depth profile in the center

© 2012 HORIBA Scientific. All rights reserved. Red – CH 4 Green – SiO 2 Blue - carbon Inclusion 1 – depth profile in the center “Second peak” in methane concentration due to the fact that second order line from carbon between 2878 and 2973 cm -1 overlaps with line of CH 4 at 2910 cm -1.

© 2012 HORIBA Scientific. All rights reserved. Inclusion 1 Black dots – photo induced damages due to the interaction of the laser beam with something on the inner surface of the inclusion. Spectral features are the same at high and low power (no damages) and it looks like amorphous carbon.

© 2012 HORIBA Scientific. All rights reserved. Red – CH 4 Green – SiO 2 No carbon detected in this inclusion Inclusion 2 – depth profile in the center

© 2012 HORIBA Scientific. All rights reserved. Inclusion 2 Inclusion contains water

© 2012 HORIBA Scientific. All rights reserved. Inclusion 3

© 2012 HORIBA Scientific. All rights reserved. Red – CH 4 Green – SiO 2 No carbon detected in this inclusion Inclusion 3 – depth profile in the center

© 2012 HORIBA Scientific. All rights reserved. Homogenization Temperatures The two inclusions on which Raman data obtained show up lowering the Th measurements. Inclusions not probed with the laser give a uniform Th of -82.5C to -82.6C. 1 3

© 2012 HORIBA Scientific. All rights reserved. Raman spectroscopy is a practical exploration tool to study geological materials including fluid inclusions. With its high spatial resolution, Raman spectroscopy is very useful to determine the composition of the embedded fluids and gas phase. Imaging of fluid inclusion allows obtain information about distribution of liquid and gas phase and detect thin layer of water or carbon on the surface. Light induced changes are observed in some inclusions Inclusions on which Raman spectra obtained show lowering in Th (-85.7C and C) but inclusions not probed with the laser give a uniform Th of -82.5C to -82.6C. It was found that there is a shift of 2914 cm -1 band of CH 4 to cm -1 which can be explained by high pressure in the inclusion. Summary

© 2012 HORIBA Scientific. All rights reserved