Natural chlorine isotope variations

Kaufmann, Ronald S.; Long, Austin; Bentley, Harold W.; Davis, Stanley N.

doi:10.1038/309338a0

Cited by 222 publications

(103 citation statements)

References 8 publications

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“…The δ 37 Cl values for atacamite (±0.1‰ precision) range from -0.2 to +0.1‰ relative to the standard mean ocean chloride (SMOC), whereas, both measured Cretaceous sediments gave identical values of -0.1‰ (SMOC). The δ 37 Cl values obtained for atacamite are indicative of nonmagmatic origin for the chloride (Kaufmann et al, 1984;Sharp et al, 2007). The similar values of δ 37 Cl in atacamite and Cretaceous limestone suggest that the exposed Lower Cretaceous reef complex was leached by meteoric water generating elevated concentrations of chloride in the percolating groundwater and thus its isotopic signature is preserved in the atacamite samples.…”

Section: Discussionsupporting

confidence: 50%

Revisiting three minerals from Cioclovina Cave (Romania)

Onac¹,

Effenberger²,

Collins³

et al. 2011

IJS

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O] based on single-crystal X-ray diffraction, electron microprobe, stable isotope analyses, and scanning electron microscope imaging. This is the first reported occurrence of kröhnkite in a cave environment. Atacamite represents the weathering product (in the presence of Lower-Cretaceous limestone-derived chlorine) of copper minerals washed into the cave from nearby ore bodies. Atacamite and kröhnkite have similar sources for copper and chlorine, whereas sodium probably originates from weathered Precambrian and Permian detrital rocks. Collinsite is believed to have precipitated from bat guano in a damp, nearneutral pH environment. The results show the following sequence of precipitation: ardealite-brushite-(gypsum)-atacamite-kröhnkite. This suggests that the observed mineral paragenesis is controlled by the neutralization potential of the host-rock mineralogy and the concentrations of Ca, Cl, Cu, and Na.Keywords: cave minerals, sulfates, phosphates, guano, stable isotopes, Cioclovina Cave, Romania Abstract:

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Section: Discussionsupporting

confidence: 50%

Revisiting three minerals from Cioclovina Cave (Romania)

Onac¹,

Effenberger²,

Collins³

et al. 2011

IJS

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“…In order to correct for instrument drifts, values are measured in comparison to reference/monitoring peaks which are introduced via a dual inlet system and consist of the same target analyte [e.g., trichloroethylene (TCE) pulses when TCE is measured]. Resultant machine delta values are converted into delta values relative to the international SMOC (Standard Mean Ocean Chloride) standard 27 by external calibration with independently characterized secondary standards, again of the same target analyte (i.e., a TCE standard calibrated to SMOC when TCE is measured).…”

mentioning

confidence: 99%

Compound-Specific Chlorine Isotope Analysis: A Comparison of Gas Chromatography/Isotope Ratio Mass Spectrometry and Gas Chromatography/Quadrupole Mass Spectrometry Methods in an Interlaboratory Study

et al. 2011

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Chlorine isotope analysis of chlorinated hydrocarbons like trichloroethylene (TCE) is of emerging demand because these species are important environmental pollutants. Continuous flow analysis of noncombusted TCE molecules, either by gas chromatography/isotope ratio mass spectrometry (GC/IRMS) or by GC/quadrupole mass spectrometry (GC/qMS), was recently brought forward as innovative analytical solution. Despite early implementations, a benchmark for routine applications has been missing. This study systematically compared the performance of GC/qMS versus GC/IRMS in six laboratories involving eight different instruments (GC/IRMS, Isoprime and Thermo MAT-253; GC/qMS, Agilent 5973N, two Agilent 5975C, two Thermo DSQII, and one Thermo DSQI). Calibrations of 37 Cl/ 35 Cl instrument data against the international SMOC scale (Standard Mean Ocean Chloride) deviated between instruments and over time. Therefore, at least two calibration standards are required to obtain true differences between samples. Amount dependency of δ 37 Cl was pronounced for some instruments, but could be eliminated by corrections, or by adjusting amplitudes of standards and samples. Precision decreased in the order GC/IRMS (1σ ≈ 0.1%), to GC/qMS (1σ ≈ 0.2À0.5% for Agilent GC/qMS and 1σ ≈ 0.2À0.9% for Thermo GC/qMS). Nonetheless, δ 37 Cl values between laboratories showed good agreement when the same external standards were used. These results lend confidence to the methods and may serve as a benchmark for future applications.

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“…Unlike the isotopes of those two elements, however, C1 isotopes are not widely fractionated in nature. Small variations in d37C1 values (~2.1% ) were reported by Kaufman et al (1984) in a number of different water types. Variations in d37C1 values ranged from -1.29 to +0.53 in deep groundwaters from Texas.…”

Section: Lithgenic Elements With Fractionating Isotopesmentioning

confidence: 99%

Lithogenic and cosmogenic tracers in catchment hydrology

Nimz¹

1995

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Natural chlorine isotope variations

Cited by 222 publications

References 8 publications

Revisiting three minerals from Cioclovina Cave (Romania)

Revisiting three minerals from Cioclovina Cave (Romania)

Compound-Specific Chlorine Isotope Analysis: A Comparison of Gas Chromatography/Isotope Ratio Mass Spectrometry and Gas Chromatography/Quadrupole Mass Spectrometry Methods in an Interlaboratory Study

Lithogenic and cosmogenic tracers in catchment hydrology

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