Precise determination of stable chlorine isotopic ratios in low-concentration natural samples

Magenheim, Andrew J.; Spivack, Arthur J.; Volpe, Christopher; Ransom, Barbara

doi:10.1016/0016-7037(94)90183-x

Cited by 100 publications

(51 citation statements)

References 11 publications

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“…The most depleted Cl isotopic composition of -6 0 00 is detected in pore waters separated from 340 centimeters below sea floor (cmbsf) at G23. Due to possible diffusion artifacts, chlorine isotopes are normally in negative values in the pore waters (Magenheim et al 1994;Eggenkamp et al 1995). The natural δ 37 Cl variation in the Earth's surface is smaller than 2 0 00 .…”

Section: Chlorine and Chlorine Isotopementioning

confidence: 99%

“…The two stable Cl isotopes, 35 Cl (75.78%) and 37 Cl (24.22%) (Rosman and Taylor 1998), show small isotopic fractionations (~2 0 00 ) in surface hydro-geological cycles, including river, groundwater, seawater and basin brines (Desaulniers et al 1986;Eggenkamp et al 1994;. The Cl isotopic compositions in basaltic glass and silicate minerals sampled from mid-ocean ridge are heavier than seawater, 0.2 -7.2 0 00 and 0.3 -7.5 0 00, respectively (Magenheim et al 1994(Magenheim et al , 1995. Due to its conservative geochemical characteristics, the variations in chlorine content in pore water often serve as an indicator for estimating the mixing ratios between seawater and other water mass end-members.…”

Section: Introductionmentioning

confidence: 97%

“…There are four possible mechanisms that may alter the Cl and Cl isotopic compositions in the fluids. First, precipitation, dissociation and evaporation of Cl-containing fluids will lead to 37 Cl enrichment in solid phases and change the Cl concentration in the remaining fluids (Magenheim et al 1994;Eggenkamp et al 1995). Secondly, differences in the diffusion rate between the two isotopes in groundwater or marine sedimentary column causes 35 Cl to become more depleted at depth (Desauliniers et al 1986;Eggenkamp et al 1994).…”

Section: Introductionmentioning

confidence: 99%

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Distribution of B, Cl and Their Isotopes in Pore Waters Separated from Gas Hydrate Potential Areas, Offshore Southwestern Taiwan

Chao¹,

You²

2006

Terr. Atmos. Ocean. Sci.

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Section: Chlorine and Chlorine Isotopementioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Distribution of B, Cl and Their Isotopes in Pore Waters Separated from Gas Hydrate Potential Areas, Offshore Southwestern Taiwan

Chao¹,

You²

2006

Terr. Atmos. Ocean. Sci.

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“…The higher Br/Cl ratios of extracts from Plains might suggest that terrestrial adsorption of halogens can act to increase Br/Cl ratios. This might also be expected to alter the δ 37 Cl values, but the available data suggest that adsorption of aerosols tends to increase δ 37 Cl (Magenheim et al 1994), so again, there is no obvious sign of Cl contamination. Therefore, the study of Cl isotopes in chondrites need not be prohibited by the issue of terrestrial contamination, although care would be necessary to avoid samples sampled near coastlines or of great terrestrial age, e.g., Langenauer and Krähenbühl (1993).…”

Section: Bulk Chondrite Halogen Abundances and Effects Of Terrestrialmentioning

confidence: 99%

“…Zag halite and the silicate extract have light chlorine isotopic values compared to bulk carbonaceous chondrites (Magenheim et al 1994(Magenheim et al , 1995 (Fig. 3).…”

Section: Br/cl Brine Ratios and CL Isotopic Valuesmentioning

confidence: 99%

Halite and stable chlorine isotopes in the Zag H3–6 breccia

Bridges

Banks

Smith

et al. 2004

Meteorit & Planetary Scien

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Abstract-Zag is an H3-6 chondrite regolith breccia within which we have studied 14 halite grains ≤3 mm. The purity of the associated NaCl-H 2 O brine is implied by freezing characteristics of fluid inclusions in the halite and EPMA analyses together with a lack of other evaporite-like phases in the Zag H3-6 component. This is inconsistent with multi-stage evolution of the fluid involving scavenging of cations in the Zag region of the parent body. We suggest that the halite grains are clastic and did not crystallize in situ. Halite and water-soluble extracts from Zag have light Cl isotopic compositions, δ 37 Cl = −1.4 to −2.8‰. Previously reported bulk carbonaceous chondrite values are approximately δ 37 Cl = +3 to +4‰. This difference is too great to be the result of fractionation during evaporation, and instead, we suggest that Cl isotopes in chondrites are fractionated between a light reservoir associated with fluids and a heavier reservoir associated with higher temperature phases such as phosphates and silicates. Extraterrestrial carbon released at 600 °C from the H3-4 matrix has δ 13 C = −20‰, consistent with poorly graphitized material being introduced into the matrix rather than indigenous carbonate derived from a brine. We have also examined 28 other H chondrite falls to ascertain how widespread halite or evaporite-like mineral assemblages are in ordinary chondrites. We did not find any more to add to Zag (H3-6) and Monahans (H5), which suggests that such highly soluble phases were not usually preserved on the parent bodies.

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Determination of inorganic chlorine stable isotopes by continuous flow isotope ratio mass spectrometry

Shouakar-Stash

Drimmie

Frape

2004

Rapid Comm Mass Spectrometry

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Chlorine stable isotope analyses of inorganic samples were conducted using continuous flow isotope ratio mass spectrometry (CF-IRMS) coupled with gas chromatography (GC). Inorganic chloride was precipitated in the form of silver chloride (AgCl) by using silver nitrate in a standard methodology. Chlorine stable isotope analysis was carried out on methyl chloride (CH3Cl) after converting AgCl into CH3Cl by reacting it with methyl iodide (CH3I). The reaction between AgCl and CH3I took place in 20 mL size vials. Addition of CH3I was performed in a glove bag under helium flow. An Agilent 6890 gas chromatograph equipped with a CTC Analytics CombiPAL autosampler and a DB-5MS 60 m column was used to separate CH3Cl from CH3I. This new technique uses samples as small as 0.2 mg of AgCl (1.4 micromol of Cl-). The chlorine stable isotope analysis using continuous flow technology showed excellent precision and accuracy. The internal precision using pure CH3Cl gas is better than +/-0.04 per thousand (+/-STDV). The external precision using seawater standard is better than +/-0.07 per thousand (+/-STDV) for n=12. Moreover, the sample analysis time is much shorter and many more samples can be analyzed in one day than by using the conventional off-line techniques.

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Precise determination of stable chlorine isotopic ratios in low-concentration natural samples

Cited by 100 publications

References 11 publications

Distribution of B, Cl and Their Isotopes in Pore Waters Separated from Gas Hydrate Potential Areas, Offshore Southwestern Taiwan

Distribution of B, Cl and Their Isotopes in Pore Waters Separated from Gas Hydrate Potential Areas, Offshore Southwestern Taiwan

Halite and stable chlorine isotopes in the Zag H3–6 breccia

Determination of inorganic chlorine stable isotopes by continuous flow isotope ratio mass spectrometry

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