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Current Performance and Preliminary Results of a New 14C Extraction Line for Meteorites at the University of Bern

Published online by Cambridge University Press:  16 November 2017

Marianna Mészáros ,
Ingo Leya ,
Beda A Hofmann  and
Sönke Szidat
Marianna Mészáros*
Affiliation:
Space Research and Planetary Sciences, University of Bern, Sidlerstrasse 5, Bern 3012, Switzerland Natural History Museum Bern, Bernastrasse 15, Bern 3005, Switzerland
Ingo Leya
Affiliation:
Space Research and Planetary Sciences, University of Bern, Sidlerstrasse 5, Bern 3012, Switzerland
Beda A Hofmann
Affiliation:
Natural History Museum Bern, Bernastrasse 15, Bern 3005, Switzerland Institute of Geological Sciences, University of Bern, Baltzerstrasse 1+3, Bern 3012, Switzerland
Sönke Szidat
Affiliation:
Department of Chemistry and Biochemistry & Oeschger Center for Climate Change Research, University of Bern, Freiestrasse 3, Bern 3012, Switzerland
*
*Corresponding author. Email: marianna.meszaros@space.unibe.ch.
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Abstract

Here, we introduce a new radiocarbon (14C) extraction line operating at the University of Bern, which was designed and built for the extraction of in situ 14C from meteorites. With this system, we achieved two important developments compared to other systems. First, using the MICADAS gas-interface system, 14C can directly be measured from the collected CO2 gas, i.e., without graphitization of the sample. Second, meteorite sample masses as low as ~0.05 g can be used for high precision and reproducibility. Prior to extraction in an oxygen atmosphere held at a pressure of ~20–30 mbar in an iridium crucible at 1600°C for 40 min, samples were preheated for 1 h in a constant oxygen flow at 500°C and continuous pumping. Gas purification followed the method described previously (e.g., Hippe et al. 2009). While the blank levels for preheated samples are low (<2×104 14C atoms), the blanks for non-preheated samples are high, therefore those results cannot be used. We also report preliminary results for the L-chondrite JaH 073. The terrestrial age of 17.7±0.4 ka is in good agreement with previous results for the same sample of this meteorite, confirming that the extraction line, the gas purification system, and the AMS measurements are all reliable.

Keywords

meteoritesradiocarbon datingterrestrial age
Type
Research Article
Information
Radiocarbon , Volume 60 , Issue 2 , April 2018 , pp. 601 - 615
Copyright
© 2017 by the Arizona Board of Regents on behalf of the University of Arizona 

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References

REFERENCES

Al-Kathiri, A, Hofmann, BA, Jull, AJT, Gnos, E. 2005. Weathering of meteorites from Oman: correlation of chemical and mineralogical weathering proxies with 14C terrestrial ages and the influence of soil chemistry. Meteoritics and Planetary Science 40:1215–1239.Google Scholar
Bland, PA, Smith, TB, Jull, AJT, Berry, FJ, Bevan, AWR, Cloudt, S, Pillinger, CT. 1996. The flux of meteorites to the Earth over the last 50,000 years. Monthly Notices of the Royal Astronomical Society 283:551–565.Google Scholar
Bland, PA, Sexton, AS, Jull, AJT, Bevan, AWR, Berry, FJ, Thornley, DM, Astin, TR, Britt, DT, Pillinger, CT. 1998. Climate and rock weathering: a study of terrestrial age dated ordinary chondritic meteorites from hot desert regions. Geochimica et Cosmochimica Acta 62:3169–3184.Google Scholar
Bland, PA, Zolensky, ME, Benedix, GK, Sephton, MA. 2006. Weathering of chondritic meteorites. In: Lauretta DS, McSween Jr. HY, editors. Meteorites and the Early Solar System II. Tucson, AZ: The University of Arizona Press. p 853–867.Google Scholar
Born, W, Begemann, F. 1975. 14C-39Arme correlations in chondrites and their pre-atmospheric size. Earth and Planetary Science Letters 25:159–169.Google Scholar
Chang, C, Wänke, H. 1969. Beryllium-10 in iron meteorites: They cosmic-ray exposure and terrestrial ages. In: Millmann PM, editor. Meteorite Research. Dordrecht, Holland: D. Reidel Publishing Company. p 397–406.CrossRefGoogle Scholar
Cornish, L, Doyle, A. 1984. Use of ethanolamine thioglycollate in the conservation of pyritized fossils. Palaeontology 27:421–424.Google Scholar
Gnos, E, Lorenzetti, S, Eugster, O, Jull, AJT, Hofmann, BA, Al-Kathiri, A, Eggimann, M. 2009. The Jiddat al Harasis 073 strewn field, Sultanate of Oman. Meteoritics and Planetary Science 44:375–387.CrossRefGoogle Scholar
Gooding, JL, Muenow, DW. 1977. Experimental vaporization of the Holbrook chondrite. Meteoritics and Planetary Science 12:401–408.Google Scholar
Hippe, K, Kober, F, Baur, H, Ruff, M, Wacker, L, Wieler, R. 2009. The current performance of the in situ 14C extraction line at ETH. Quaternary Geochronology 4:493–500.Google Scholar
Hippe, K, Kober, F, Wacker, L, Fahrni, SM, Ivy-Ochs, S, Akçar, N, Schlüchter, C, Wieler, R. 2013. An update on in situ cosmogenic 14C analysis at ETH Zürich. Nuclear Instruments and Methods in Physics Research B 294:81–86.Google Scholar
Hippe, K, Lifton, L. 2014. Calculating isotope ratios and nuclide concentrations for in situ cosmogenic 14C analyses. Radiocarbon 56(3):1167–1174.Google Scholar
Huber, L, Gnos, E, Hofmann, BA, Welten, KC, Nishiizumi, K, Caffee, MW, Hillegonds, DJ, Leya, I. 2008. The complex exposure history of the Jiddat al Harasis 073 L-chondrite shower. Meteoritics and Planetary Science 43:1691–1708.Google Scholar
Jarosewich, E. 1990. Chemical analyses of meteorites: a compilation of stony and iron meteorite analyses. Meteoritics and Planetary Science 25:323–337.Google Scholar
Jull, AJT. 2001. Terrestrial ages of meteorites. In: Schmitz B, Peuker-Ehrenbrink B, editors. Accrection of Extraterrestrial Matter throughout Earth’s History. New York: Kluwer Academic/Plenum Publishers. p 241–266.Google Scholar
Jull, AJT. 2006. Terrestrial ages of meteorites. In: Lauretta D, McSween HY Jr, editors. Meteorites and the Early Solar System II. Tucson, AZ: The University of Arizona Press. p 889–905.Google Scholar
Jull, AJT, Donahue, J, Linick, TW. 1989. 14C activities in recently fallen meteorites and Antarctic meteorites. Geochimica et Cosmochimica Acta 53:2095–2100.Google Scholar
Jull, AJT, Wlotzka, F, Palme, H, Donahue, DJ. 1990. Distribution of terrestrial age and petrologic types of meteorites from Western Lybia. Geochimicia et Cosmochimica Acta 54:2895–2899.Google Scholar
Jull, AJT, Wlotzka, F, Donahue, DJ. 1991. Terrestrial ages and petrologic description of Roosevelt County meteorites (abstract). 22nd Lunar and Planetary Science Conference. p 667–8.Google Scholar
Jull, AJT, Donahue, DJ, Cielaszyk, E, Wlotzka, F. 1993. 14C terrestrial ages and weathering of 27 meteorites from the southern high plains and adjacent areas (USA). Meteoritics and Planetary Science 28:188–195.CrossRefGoogle Scholar
Jull, AJT, McHargue, LR, Bland, PA, Greenwood, RC, Bevan, AWR, Kim, KJ, LaMotta, SE, Johnson, JA. 2010. Terrestrial ages of meteorites from the Nullarbor region, Australia, based on 14C and 14C-10Be measurements. Meteoritics and Planetary Science 45:1271–1283.Google Scholar
Jull, AJT, Giscard, MD, Hutzler, A, Schnitzer, CJ, Zahn, D, Burr, GS, McHargue, LR, Hill, D. 2013. Radionuclide studies of stony meteorites from hot deserts. Radiocarbon 55(3):1779–1789.Google Scholar
Leya, I, Masarik, J. 2009. Cosmogenic nuclides in stony meteorites revisited. Meteoritics and Planetary Science 44:1061–1086.Google Scholar
Leya, I, Lange, H-J, Neumann, S, Wieler, R, Michel, R. 2000. The production of cosmogenic nuclides in stony meteoroids by galactic cosmic-ray particles. Meteoritics and Planetary Science 35:259–286.Google Scholar
Leya, I, Neumann, S, Wieler, R, Michel, R. 2001. The production of cosmogenic nuclides by galactic cosmic-ray particles for 2π exposure geometries. Meteoritics and Planetary Science 36:1547–1561.CrossRefGoogle Scholar
Lee, MR, Bland, PA. 2004. Mechanisms of weathering of meteorites recovered from hot and cold deserts and the formation of phyllosilicates. Geochimica et Cosmochimica Acta 68:893–916.Google Scholar
Lifton, NA, Jull, AJT, Quade, J. 2001. A new extraction technique and production rate estimate for in situ cosmogenic 14C in quartz. Geochimica et Cosmochimica Acta 65:1953–1969.Google Scholar
Makjanic, J, Vis, RD, Hovenier, JW, Heymann, D. 1993. Carbon in the matrices of ordinary chondrites. Meteoritics and Planetary Science 28:63–70.Google Scholar
Moore, CB, Lewis, CF. 1967. Total carbon content of ordinary chondrites. Journal of Geophysical Research 72:6289–6292.Google Scholar
Nishiizumi, K, Caffee, MW. 2001. Exposure histories of lunar meteorites Dhofar 025, 026 and Northwest Africa 482 (abstract #5411). 64th Meteoritical Society Meeting.Google Scholar
Nishiizumi, K, Okazaki, R, Park, J, Nagao, K, Masarik, J, Finkel, RC. 2002. Exposure and terrestrial histories of Dhofar 019 Martian meteorite (abstract #1355). 33rd Lunar and Planetary Science Conference.Google Scholar
Pigati, JS. 2004. Experimental developments and application of carbon-14 and in situ cosmogenic nuclide dating techniques [PhD thesis]. University of Arizona.Google Scholar
Reedy, RC. 1985. A model for GCR-particle fluxes in stony meteorites and production rates of cosmogenic nuclides. Journal of Geophysical Research 90:722–728.Google Scholar
Reedy, RC, Arnold, JR. 1972. Interaction of solar and galactic cosmic-ray particles with the moon. Journal of Geophysical Research 77:537–555.Google Scholar
Reimer, PJ, Brown, TA, Reimer, RW. 2004. Discussion: reporting and calibration of post-bomb 14C data. Radiocarbon 46(3):299–304.Google Scholar
Ruff, M, Wacker, L, Gäggeler, HW, Suter, M, Synal, H-A, Szidat, S. 2007. A gas ion source for radiocarbon measurements at 200 kV. Radiocarbon 49(2):307–314.CrossRefGoogle Scholar
Schaefer, L, Fegley, B Jr. 2007. Outgassing of ordinary chondritic material and some of its implications for the chemistry of asteroids, planets, and satellites. Icarus 186:462–483.Google Scholar
Scherer, P, Schultz, L, Neupert, U, Knauer, M, Neumann, S, Leya, I, Michel, R, Mokos, J, Lipschutz, ME, Metzler, K, Suter, M, Kubik, PW. 1997. Allan Hills 88019: an Antarctic H-chondrite with a very long terrestrial age. Meteoritics and Planetary Science 32:769–773.Google Scholar
Szidat, S, Salazar, GA, Vogel, E, Battaglia, M, Wacker, L, Synal, HA, Türler, A. 2014. 14C analysis and sample preparation at the new Bern Laboratory for the analysis of radiocarbon with AMS (LARA). Radiocarbon 56(2):561–566.Google Scholar
Wacker, L, Fahrni, SM, Hajdas, I, Molnar, M, Synal, HA, Szidat, S, Zhang, YL. 2013. A versatile gas interface for routine radiocarbon analysis with a gas ion source. Nuclear Instruments and Methods in Physics Research B 294:315–319.Google Scholar
Wasson, JT, Kallemeyn, GW. 1988. Composition of chondrites. Philosophical Transactions of the Royal Society London A 325:535–544.Google Scholar
Welten, KC, Alderliesten, C, van der Borg, K, Lindner, L, Loeken, T, Schultz, L. 1997. Lewis Cliff 86360: an Antarctic L-chondrite with a terrestrial age of 2.35 million years. Meteoritics and Planetary Science 32:775–780.Google Scholar
Welten, KC, Nishiizumi, K, Hillegonds, DJ, Caffee, MW. 2006. The complex exposure history of a large L6 chondrite shower from Oman. Meteoritics and Planetary Science 41:A187.Google Scholar
Zurfluh, FJ, Hofmann, BA, Gnos, E, Eggenberger, U, Jull, AJT. 2016. Weathering of ordinary chondrites from Oman: correlation of weathering parameters with 14C terrestrial ages and a refined weathering scale. Meteoritics and Planetary Science 51:1685–1700.Google Scholar