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Developing Micro-Raman Mass Spectrometry for Measuring Carbon Isotopic Composition of Carbon Dioxide

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Abstract:

We investigated the applicability of micro-Raman spectroscopy for determining carbon isotopic compositions (13C/12C) of minute CO2 fluid inclusions in minerals. This method is nondestructive and has sufficiently high spatial resolution (1 μm) to measure each fluid inclusion independently. Raman spectra of CO2 fluid have 12CO2-origin peaks at about 1285 cm−1 and 1389 cm−1 (V [12] and V+ [12]) and a 13CO2-origin peak at about 1370 cm−1 (V+ [13]). The relationship between carbon isotopic compositions and peak intensity ratios of V+ [12] and V+ [13] was calibrated. Considering several factors affecting the peak intensity ratio, the error in obtained carbon isotopic composition was 2% (20%). The reproducibility of the intensity ratio under the same experimental environment was 0.5% (5%). Within these error values, we can distinguish biogenic CO2 from abiogenic CO2.

Keywords: CARBON DIOXIDE; FLUID INCLUSION; ISOTOPE; ISOTOPIC COMPOSITION; MASS SPECTROMETRY; MICRO-RAMAN SPECTROSCOPY; RAMAN SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370207781393244

Affiliations: 1: Geochemical Laboratory, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan 2: Institute for Geochemistry, Kyoto University, Beppu, Oita 874-0903, Japan

Publication date: July 1, 2007

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