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Automatic 40Ar/39Ar dating techniques using multicollector

Xiu-Juan Bai1, Hua-Ning Qiu1,2*, Wen-Gui Liu3, Lian-Fu Mei1
1 Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences Wuhan), Ministry of Education, Wuhan 430074, China;2State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;3 State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences,Wuhan430074, China

 

A new fully automatic 40Ar/39Arlaboratory with a ThermoScientific©Argus VI mass spectrometer has been established in China University of Geoscience (Wuhan). We designed and developed a mini efficient preparation system (80 ml), a CO2laser 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 spectrometeris operated by the Qtegra Noble Gas software, which can control the peripheral accessories, such as pneumatic valves, CO2laser 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. Theweighted meanof atmospheric 40Ar/36Ar ratios is 302.22 ± 0.03 (1s, MSWD = 0.74, n = 200), indicating that air reservoirand pipette system and the whole instrumentsystem areverystable. 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.

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Keywords:40Ar/39Ar dating; fully automatic; CO2 laser; Argus VI mass spectrometer;

DOI:
DOI: 10.1007/s12583-017-0948-9
CLC number:
U469.72
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