Development of 36Cl standards for AMS

Sharma, Pankaj; Kubik, Peter W.; Fehn, Udo; Gove, H. E.; Nishiizumi, K.; Elmore, D.

doi:10.1016/0168-583x(90)90447-3

Cited by 130 publications

(94 citation statements)

References 14 publications

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“…where [14]. 36 Cl ions can be separated from isobar 36 S at the final detector with a 30 nm thickness SiN membrane window, resulting in the background 36 Cl/Cl ratio less than 110 −15 .…”

Section: Methodsmentioning

confidence: 99%

In-situ cosmogenic 36Cl denudation rates of carbonates in Guizhou karst area

Liu

Freeman

et al. 2013

Chin. Sci. Bull.

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This study quantifies surface denudation of carbonate rocks by the first application of in-situ cosmogenic 36 Cl in China. Concentrations of natural Cl and in-situ cosmogenic 36 Cl in bare carbonates from Guizhou karst areas were measured with isotope dilution by accelerator mass spectrometer. The Cl concentration varied from 16 to 206 ppm. The 36 Cl concentrations were in range of (0.8-2.4)10 6 atom g −1 , resulting in total denudation rates of 20-50 mm ka −1 that averaged over a 10 4 -10 5 a timescale. The 36 Cl-denudation rates showed roughly a negative correlation with the local mean temperature. This preliminary observation may suggest the variations of proportions of chemical weathering and physical erosion in denudation process, depending upon local climatic conditions. in-situ cosmogenic 36 Cl, denudation rate, climatic condition, carbonate, Guizhou Citation:Xu S, Liu C Q, Freeman S, et al. In-situ cosmogenic 36 Cl denudation rates of carbonates in Guizhou karst area.

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Section: Methodsmentioning

confidence: 99%

In-situ cosmogenic 36Cl denudation rates of carbonates in Guizhou karst area

Liu

Freeman

et al. 2013

Chin. Sci. Bull.

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“…The measured ratios of (2-8) × 10 −12 for 10 Be/Be, (7-26) × 10 −12 for 26 Al/ Al, (1.0-3.2) × 10 −12 for 36 Cl/Cl, and (1.5-10) × 10 −12 for (Nishiizumi et al 2000(Nishiizumi et al , 2007Nishiizumi 2004;Sharma et al 1990). The results, corrected for decay during the terrestrial residence time of 18 ka, are reported in Table 4 in disintegrations per minute per kg, i.e., dpm/kg.…”

Section: Radionuclidesmentioning

confidence: 99%

The complex exposure history of the Jiddat al Harasis 073 L‐chondrite shower

Huber

Gnos

Hofmann

et al. 2008

Meteorit & Planetary Scien

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36 Ar is predominantly released between 1000-1200 °C. All these results are consistent with a first-stage exposure of ~65 Ma within ~20 cm of the surface of the L-chondrite parent body, followed by ejection of a 1.5-2 m large object, which was then delivered to Earth within about 0.5 and 0.7 Ma. The cosmogenic nuclide data in JaH 073 thus corroborate the trend that many of the large chondrites studied so far experienced a complex exposure history. The observed 3 He/ 21 Ne ratios of 2.5-3.0 in the most shielded samples (including those of the main mass) are lower than predicted by model calculations, but similar to the lowest values found in the large Gold Basin L-chondrite shower. The Bern plot, which gives a linear correlation for 3 He/ 21 Ne versus 22 Ne/ 21 Ne, is evidently not valid for very high shielding. Some of our measured 22 Ne/ 21 Ne ratios in JaH 073 are lower than 1.06, which is not well understood, but might be explained by loss of cosmogenic neon from shocked sodium-rich plagioclase during terrestrial weathering. The amount of trapped atmospheric argon in the JaH 073 fragments varies by almost two orders of magnitude and shows only a weak correlation with the size of the fragments, which range from <100 g to >50 kg. Finally, low concentrations of radiogenic 4 He and 40 Ar indicate incomplete degassing <1 Ga ago, probably at the main collision event on the L-chondrite parent body ~480 Ma ago.

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“…All radionuclide concentrations were measured by accelerator mass spectrometry (AMS) at the Lawrence Livermore National Laboratory (Davis et al 1990). Measured 10 Be/Be, 26 Al/Al, 36 Cl/Cl, and 41 Ca/Ca ratios were corrected for isobaric interferences and chemical blanks and normalized to 10 Be, 26 Al, 36 Cl, and 41 Ca standards prepared by one of the authors (K. Nishiizumi) as described previously (Nishiizumi et al 1984;Sharma et al 1990;Nishiizumi, Caffee, and DePaolo 2000). These results are shown in Table 2 and include all known AMS uncertainties (1σ) of the samples, standards, and blanks, but not the uncertainties in the absolute values of the AMS standards.…”

Section: Radionuclide and Elemental Analysesmentioning

confidence: 99%