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| Titel |
Raman Spectroscopy: an essential tool for future IODP expeditions |
| VerfasserIn |
Sergio Andò, Eduardo Garzanti, Denise K. Kulhanek |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250129504
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| Publikation (Nr.) |
 EGU/EGU2016-9628.pdf |
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| Zusammenfassung |
| The scientific drilling of oceanic sedimentary sequences plays a fundamental part in
provenance studies, paleoclimate recostructions, and source-to-sink investigations (e.g.,
France-Lanord et al., 2015; Pandey et al., 2015). When studying oceanic deposits, Raman
spectroscopy can and does represent an essential flexible tool for the multidisciplinary
approach necessary to integrate the insight provided by different disciplines. This new
user-friendly technique opens up an innovative avenue to study in real time the composition
of detrital mineral grains of any origin, complementing traditional methods of provenance
analysis (e.g., sedimentary petrography, heavy minerals; Andò and Garzanti, 2014). Raman
spectra can readily reveal the chemistry of foraminiferal tests, nannofossils and
other biogenic debris for the study of ecosystem evolution and paleoclimate, or
the Ca/Mg ratio in biogenic or terrigenous carbonates for geological or marine
biological applications and oil exploration (Borromeo et al., 2015). For the study of
pelagic or turbiditic muds, which represent the bulk of the deep-marine sedimentary
record, Raman spectroscopy allows us to identify silt-sized grains down to the size of
a few microns with the same precision level required in quantitative provenance
analysis of sand-sized sediments (Andò et al., 2011). Silt and siltstone also represent
a very conspicuous part of the stratigraphic record onshore and usually preserve
original mineralogical assemblages better than more permeable interbedded sand and
sandstone (Blatt, 1985). Raman spectra can be obtained on sample volumes of only a
few cubic microns by a confocal micro-Raman coupled with a standard polarizing
light microscope using a 50× objective. The size of this apparatus can be easily
placed onboard an IODP vessel to provide crucial information and quickly solve
identification problems for the benefit of a wide range of scientists during future
expeditions.
Cited references
Andò, S., Vignola, P., Garzanti, E., 2011. Raman counting: a new method to determine
provenance of silt. Rend. Fis. Acc. Lincei, 22: 327-347.
Andò, S., Garzanti, E., 2014. Raman spectroscopy in heavy-mineral studies. Geological
Society, London, Special Publications, 386 (1), 395-412.
Blatt, H., (1985). Provenance studies and mudrocks. Journal of Sedimentary Research, 55
(1), 69-75.
Borromeo, L., Zimmermann, U., Andò, S., Coletti, G., Bersani, D., Basso, D., Gentile, P.,
Garzanti, E., 2015. Raman Spectroscopy as a tool for magnesium estimation in Mg-calcite.
Periodico di Mineralogia , ECMS, 35-36.
France-Lanord, C., Spiess, V., Klaus, A., and the Expedition 354 Scientists, 2015.
IODP, Exp. 354, Preliminary Report: Bengal Fan, Neogene and late Paleogene
record of Himalayan orogeny and climate: a transect across the Middle Bengal
Fan.
Pandey, D.K., Clift, P.D., Kulhanek, D.K. and the Expedition 355 Scientists, 2015. IODP,
Exp. 355, Preliminary Report: Arabian Sea Monsoon, Deep sea drilling in the Arabian Sea:
constraining tectonic-monsoon interactions in South Asia. |
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