Micro-analysis of sulfur-isotope ratios and zonation by laser microprobe

Crowe, Douglas E.; Valley, John W.; Baker, K. L.

doi:10.1016/0016-7037(90)90272-m

Cited by 99 publications

(32 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Microanalytical techniques such as laser microprobe (Kelley and Fallick 1990;Crowe et al 1990;Hu et al 2003;Ono et al 2006) and ion microprobe (Chaussidon et al 1987(Chaussidon et al , 1989Eldridge et al 1988Eldridge et al , 1993Kozdon et al 2010) have become promising tools for determining sulfur isotope ratios.…”

Section: Methodsmentioning

confidence: 99%

Isotope Fractionation Processes of Selected Elements

Hoefs

2015

Stable Isotope Geochemistry

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 99%

Isotope Fractionation Processes of Selected Elements

Hoefs

2015

Stable Isotope Geochemistry

View full text Add to dashboard Cite

“…Laser-based techniques resulting in SO 2 for isotopic analysis were fi rst developed by Crowe et al (1990). Spatial resolution can be achieved as good as a spot size of 150 µm having an analytical precision of ±0.3 to 0.6‰.…”

Section: Methodsmentioning

confidence: 99%

Sulfur Isotope Geochemistry of Sulfide Minerals

Seal

2006

Reviews in Mineralogy and Geochemistry

851

274

View full text Add to dashboard Cite

“…Optically clear materials such as quartz and calcite do not absorb radiation at 1.064 µm, so Nd-YAG laser is often used for isotope analysis of opaque minerals (e.g., Kelley and Fallick, 1990;Crowe et al, 1990;Crowe and Valley, 1992), microanalysis of coal constituents (Lyons et al, 1989), or noble-gas isotopes and halogens in fluid inclusions (Böhlke et al, 1989). In a Nd-YAG laser microprobe system, Pyrex ® , silica glass or sapphire window can be used to admit radiation into the vacuum chamber (Sharp, 1992).…”

Section: Lasermentioning

confidence: 99%

Laser microprobe technique for stable carbon isotope analyses of organic carbon in sedimentary rocks.

et al. 2000

View full text Add to dashboard Cite

A technique for analyzing stable carbon isotope composition of organic carbon using a Nd-YAG laser microprobe system has been developed. Analyses were performed on graphite rod and silica-graphite discs made from mixtures of silica glass and graphite powders with a weight ratio as SiO 2 /C = 3/2. The sample was ablated by the laser and simultaneously combusted by laser ablation with excess O 2 to produce CO 2 . Replicate analyses on the two types of standards under O 2 -atmospheric condition (8-20 torr) are reproducible to ±0.1‰ (1σ) for δ 13 C, which is in agreement with accepted precision by the conventional method. In order to examine the matrix effect by other silicate minerals in natural samples during laser ablation, the silica-graphite disc samples were also combusted by laser ablation without excess O 2 to produce CO 2 . In this case, the amounts of CO 2 produced were far smaller (<1%) than those of CO 2 produced with excess O 2 and the δ 13 C values range from -18.9 to -7.5‰. Considering the mass balance, we conclude that the matrix effects of silica or other silicates on the δ 13 C analyses of organic carbon can be ignored because it only result in a little positive shift (<0.2‰) in δ 13 C values. Application of the laser microprobe technique on δ 13 C analyses of organic carbon to five late Archean black shale samples (Jeerinah Formation, Hamersley Basin, Western Australia) gives δ 13 C values that are reproducible to ±0.1-0.3‰, and the mean δ 13 C values range from -37.2 to -39.1‰ which are very close to the δ 13 C values of the kerogens extracted from these shales.The analytical results demonstrate that the laser microprobe technique developed in this study is effective for the in situ isotope analyses of organic carbon in sedimentary rocks with a good precision of ±0.1‰.cryogenically and subjected to a mass spectrometer for isotope analysis. Another advanced technique for analyzing δ 13 C of organic carbon is GC-IRMS (gas chromatography-isotope ratio mass spectrometry) that is conducted using a mass spectrometer equipped with a gas chromatograph (GC) via a CuO/Pt combustion furnace operated at 850°C or 900°C (Revill et al., 1994). These techniques require large amounts (>10 mg) of powdered rock samples and are not suitable for in situ microanalysis.

show abstract

Micro-analysis of sulfur-isotope ratios and zonation by laser microprobe

Cited by 99 publications

References 28 publications

Isotope Fractionation Processes of Selected Elements

Isotope Fractionation Processes of Selected Elements

Sulfur Isotope Geochemistry of Sulfide Minerals

Laser microprobe technique for stable carbon isotope analyses of organic carbon in sedimentary rocks.

Contact Info

Product

Resources

About