Automatic ⁴⁰Ar/³⁹Ar Dating Techniques Using Multicollector ARGUS VI Noble Gas Mass Spectrometer with Self-Made Peripheral Apparatus

Abstract

A new fully automatic ⁴⁰Ar/³⁹Ar laboratory with a Thermo Scientific© ARGUS VI mass spectrometer has been established in China University of Geosciences (Wuhan). We designed and developed a mini efficient preparation system (80 mL), a CO₂ laser for heating samples, a crusher for extracting fluid inclusions within K-poor minerals and an air reservoir (31 L) and pipette (0.1 mL) system. The ARGUS VI mass spectrometer is operated by the Qtegra Noble Gas software, which can control the peripheral accessories, such as pneumatic valves, CO₂ laser and crusher through a PeriCon (peripheral controller). The experimental procedures of atmospheric argon analyses, ⁴⁰Ar/³⁹Ar dating by laser stepwise heating and by progressive crushing in vacuo, can be fully automatically performed. The weighted mean of atmospheric ⁴⁰Ar/³⁶Ar ratios is 302.22±0.03 (1σ, MSWD=0.74, n=200), indicating that air reservoir and pipette system and the whole instrument system are very stable. This laboratory is a successful pioneer example in China to establish a new noble gas laboratory with self-made peripheral accessories expect for the mass spectrometer.

Keywords

⁴⁰Ar/³⁹Ar dating / fully automatic / CO₂ laser / ARGUS VI mass spectrometer / Qtegra noble gas software

References

[1] Alexandre P., Hamilton D., Barfod D. The ARGUS Multicollection Noble Gas Mass Spectrometer. Geochimica et Cosmochimica Acta, 2006, 70 18 A8

[2] Bai X. J., Wang M., Jiang Y. D., . Direct Dating of Tin-Tungsten Mineralization of the Piaotang Tungsten Deposit, South China, by ⁴⁰Ar/³⁹Ar Progressive Crushing. Geochimica et Cosmochimica Acta, 2013, 114: 1-12.

[3] Bai X. J., Wang M., Lu K. H., . Direct Dating of Cassiterite by ⁴⁰Ar/³⁹Ar Progressive Crushing. Chinese Science Bulletin, 2011, 56(23): 1899-1904.

[4] Barfod D., Alexandre P., Hamilton D. The ARGUS Multicollection Noble Gas Mass Spectrometer. Geochimica et Cosmochimica Acta, 2006, 70 18 A34

[5] Brereton N. R. Corrections for Interfering Isotopes in the ⁴⁰Ar/³⁹Ar Dating Method. Earth and Planetary Science Letters, 1970, 8(6): 427-433.

[6] Dalrymple G. B., Alexander E. C., Lanphere M. A., . Irradiation of Samples for ⁴⁰Ar/³⁹Ar Dating Using the Geological Survey Triga Reactor. Professional Paper, 1981, 1176.

[7] Jiang Y. D., Qiu H. N., Xu Y. G. Hydrothermal Fluids, Argon Isotopes and Mineralization Ages of the Fankou Pb-Zn Deposit in South China: Insights from Sphalerite ⁴⁰Ar/³⁹Ar Progressive Crushing. Geochimica et Cosmochimica Acta, 2012, 84: 369-379.

[8] Kendrick M. A., Burgess R., Pattrick R. A. D., . Halogen and Ar-Ar Age Determinations of Inclusions within Quartz Veins from Porphyry Copper Deposits Using Complementary Noble Gas Extraction Techniques. Chemical Geology, 2001, 177(3/4): 351-370.

[9] Koppers A. A. P. ArArCALC—Software for ⁴⁰Ar/³⁹Ar Age Calculations. Computers & Geosciences, 2002, 28(5): 605-619.

[10] Lederer C. M., Shirley V. S. E. Table of Isotopes, 7th Ed, 1978.

[11] Lee J.-Y., Marti K., Severinghaus J. P., . A Redetermination of the Isotopic Abundances of Atmospheric Ar. Geochimica et Cosmochimica Acta, 2006, 70(17): 4507-4512.

[12] Liu J., Wu G., Qiu H. N., . ⁴⁰Ar/³⁹Ar Dating, Fluid Inclusions and S-Pb Isotope Systematics of the Shabaosi Gold Deposit, Heilongjiang Province, China. Geological Journal, 2015, 50(5): 592-606.

[13] Geochemistry, Geophysics, Geosystems, 2009, 10 10

[14] Mark D. F., Stuart F. M., de Podesta M. New High-Precision Measurements of the Isotopic Composition of Atmospheric Argon. Geochimica et Cosmochimica Acta, 2011, 75(23): 7494-7501.

[15] McDougall I., Brown F. H., Fleagle J. G. Stratigraphic Placement and Age of Modern Humans from Kibish, Ethiopia. Nature, 2005, 433(7027): 733-736.

[16] McDougall I., Harrison T. M. Geochronology and Termochronology by the ⁴⁰Ar/³⁹Ar Method (2nd Edition), 1999.

[17] Merrihue C., Turner G. Potassium-Argon Dating by Activation with Fast Neutrons. Journal of Geophysical Research, 1966, 71(11): 2852-2857.

[18] Mitchell J. G. The Argon-40/Argon-39 Method for Potassium-Argon Age Determination. Geochimica et Cosmochimica Acta, 1968, 32(7): 781-790.

[19] Nier A. O. A Redetermination of the Relative Abundances of the Isotopes of Carbon, Nitrogen, Oxygen, Argon, and Potassium. Physical Review, 1950, 77(6): 789-793.

[20] Pfänder J. A., Sperner B., Ratschbacher L., . High-Resolution ⁴⁰Ar/³⁹Ar Dating Using a Mechanical Sample Transfer System Combined with a High-Temperature Cell for Step Heating Experiments and a Multicollector ARGUS Noble Gas Mass Spectrometer. Geochemistry, Geophysics, Geosystems, 2014, 15(6): 2713-2726.

[21] Phillips D., Miller J. M. ⁴⁰Ar/³⁹Ar Dating of Mica-Bearing Pyrite from Thermally Overprinted Archean Gold Deposits. Geology, 2006, 34(5): 397-400.

[22] Qiu H. N. 40Ar-39Ar Dating of the Quartz Samples from Two Mineral Deposits in Western Yunnan (SW China) by Crushing in Vacuum. Chemical Geology, 1996, 127: 211-222.

[23] Qiu H. N., Bai X. J., Liu W. G., . Automatic ⁴⁰Ar/³⁹Ar Dating Technique Using Multicollector ARGUSvi Ms with Home-Made Apparatus. Geochimica, 2015, 44(5): 477-484.

[24] Qiu H. N., Jiang Y. D. Sphalerite ⁴⁰Ar/³⁹Ar Progressive Crushing and Stepwise Heating Techniques. Earth and Planetary Science Letters, 2007, 256(1/2): 224-232.

[25] Qiu H. N., Wijbrans J. R. Paleozoic Ages and Excess 40Ar in Garnets from the Bixiling Eclogite in Dabieshan, China: New Insights from ⁴⁰Ar/³⁹Ar Dating by Stepwise Crushing. Geochimica et Cosmochimica Acta, 2006, 70(9): 2354-2370.

[26] Qiu H. N., Wu H. Y., Yun J. B., . High-Precision ⁴⁰Ar/³⁹Ar Age of the Gas Emplacement into the Songliao Basin. Geology, 2011, 39(5): 451-454.

[27] Qiu H. N., Zhu B. Q., Sun D. Z. Age Significance Interpreted from 40Ar-39Ar Dating of Quartz Samples from the Dongchuan Copper Deposits, Yunnan, SW China, by Crushing and Heating. Geochemical Journal, 2002, 36(5): 475-491.

[28] Renne P. R., Cassata W. S., Morgan L. E. The Isotopic Composition of Atmospheric Argon and ⁴⁰Ar/³⁹Ar Geochronology: Time for a Change. Quaternary Geochronology, 2009, 4(4): 288-298.

[29] Renne P. R., Deino A. L., Hames W. E., . Data Reporting Norms for ⁴⁰Ar/³⁹Ar Geochronology. Quaternary Geochronology, 2009, 4(5): 346-352.

[30] Sigurgeirsson T. Age Dating of Young Basalts with the Potassium-Argon Method (in Icelandic). Unpublished Report Physics Laboratory, 1962.

[31] Turner G. Argon 40-Argon 39Dating: The Optimization of Irradiation Parameters. Earth and Planetary Science Letters, 1971, 10(2): 227-234.

[32] Turner G., Bannon M. P. Argon Isotope Geochemistry of Inclusion Fluids from Granite-Associated Mineral Veins in Southwest and Northeast England. Geochimica et Cosmochimica Acta, 1992, 56(1): 227-243.

[33] Turner G., Wang S. S. Excess Argon, Crustal Fluids and Apparent Isochrons from Crushing K-Feldspar. Earth and Planetary Science Letters, 1992, 110: 193-211.

[34] Geochemistry, Geophysics, Geosystems, 2010, 11 8

[35] Valkiers S., Vendelbo D., Berglund M., . Preparation of Argon Primary Measurement Standards for the Calibration of Ion Current Ratios Measured in Argon. International Journal of Mass Spectrometry, 2010, 291(1/2): 41-47.

[36] Wang M., Bai X. J., Hu R. G., . Direct Dating of Cassiterite in Xitian Tungsten-Tin Polymetallic Deposit, South-East Hunan, by ⁴⁰Ar/³⁹Ar Progressive Crushing. Geotectonica et Metallogenia, 2015, 39(6): 1049-1060.

[37] Wang M., Bai X. J., Yun J. B., . ⁴⁰Ar/³⁹Ar Dating of Mineralization of Shizhuyuan Polymetallic Deposit. Geochimica, 2016, 45(1): 41-51.