Exploring the multicollection approach for the 40Ar/39Ar dating technique -: art. no. Q11010

被引：10

作者：

Coulié, E ^{[1
]}

Quidelleur, X ^{[1
]}

Lefèvre, JC ^{[1
]}

Gillot, PY ^{[1
]}

机构：

[1] Univ Paris 11, Lab Geochronol MultiTech IPS IPGP Sci Terre, F-91405 Orsay, France

来源：

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS | 2004年 / 5卷

关键词：

geochronology; 40Ar/39Ar; multicollector mass spectrometer; standards; geochemistry : geochronology; geochemistry : instruments and techniques;

D O I：

10.1029/2004GC000773

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

We present an original analytical system for 40Ar/39Ar dating. It makes use of a 180degrees sector multicollection mass spectrometer equipped with five Faraday cups, which renders peak switching unnecessary during argon isotopic analyses. Compared to the single-collector approach commonly used for argon isotopic analyses, our system presents greater stability during data acquisition. Faraday cup efficiencies, which can be a limiting factor for the multicollection mass spectrometer, were highly reproducible. The analytical validity of the 40Ar/39Ar ages obtained using this new mass spectrometer has been preliminarily tested using geological standard minerals (MMhb-1, FCT-San, and HD-B1) commonly used as neutron fluence monitors. Independent plateau age determinations of Ethiopian samples duplicated over a 1-year interval demonstrated the reproducibility of the analyses. The results of these measurements highlight the good behavior of this new instrument for 40Ar/39Ar step heating dating. The age reproducibility of successive steps leads to analytical errors lower than 0.1% for well-behaved samples. This system, still in its initial stage of development, represents an alternative solution that is worth exploring in order to improve absolute dating by the 40Ar/39Ar technique.

引用

页数：11

共 23 条

[1] Intercalibration of 40Ar/39Ar dating standards [J].

Baksi, AK ;

Archibald, DA ;

Farrar, E .

CHEMICAL GEOLOGY, 1996, 129 (3-4) :307-324

[2]

Cebula G.T., 1986, Abstracts: Terra Cognita, V6, P139

[3] Comparative K-Ar and Ar/Ar dating of Ethiopian and Yemenite Oligocene volcanism:: implications for timing and duration of the Ethiopian traps [J].

Coulié, E ;

Quidelleur, X ;

Gillot, PY ;

Courtillot, V ;

Lefèvre, JC ;

Chiesa, S .

EARTH AND PLANETARY SCIENCE LETTERS, 2003, 206 (3-4) :477-492

[4]

COULIE E, 2001, THESIS U PARIS SUD O

[5] EXAMINATION OF SOME PROPOSED K-AR STANDARDS - AR-40 AR-39 ANALYSES AND CONVENTIONAL K-AR DATA [J].

FUHRMANN, U ;

LIPPOLT, HJ ;

HESS, JC .

CHEMICAL GEOLOGY, 1987, 66 (1-2) :41-51

[6]

GILLOT PY, 1986, CHEM GEOL, V59, P205, DOI 10.1016/0168-9622(86)90072-2

[7]

HARRISON TM, 1981, CONTRIB MINERAL PETR, V78, P324

[8]

Hess J.C., 1994, Phanerozoic Time Scale. Bull. Liais. Inform. IUGS Subcom. Geochronol, V12, P19

[9]

HURFORD AJ, 1985, CHEM GEOL, V58, P23, DOI 10.1016/0168-9622(85)90024-7

[10] Precise K-Ar, 40Ar/39Ar, Rb-Sr and U/Pb mineral ages from the 27.5 Ma Fish Canyon Tuff reference standard [J].

Lanphere, MA ;

Baadsgaard, H .

CHEMICAL GEOLOGY, 2001, 175 (3-4) :653-671

← 1 2 3 →