THE PROSPECT OF HIGH-PRECISION THERMAL IONIZATION MASS SPECTROMETRY(TIMS) APPLICATIONS IN ANTARCTIC METEORITES

doi:10.3724/SP.J.1084.2013.00425

Abstract

Abstract: The thermal ionization mass spectrometry (TIMS) is one of the most important techniques for isotopic measurements. TIMS technology has a broad prospect of application in cosmochemistry because of the high accuracy and sensitivityse. TRITON TIMS can mesure high–precision isotopic compositions of Re–Os、Cr、Sr、Nd and Pb systematics of meteorites. Small loads (10pg–100 ng Sr) of international standard NBS 987 were analyzed for 87Sr/86Sr isotope ratios with an precision of 5‰ to 5ppm by TIMS. The ratios of 143Nd/144Nd of LaJolla-Nd is 0.511842±0.000005 (2SE, n=28) in our lab, and the best precision is better than 2ppm. Using 207Pb–204Pb double spike, the reproducibilities of 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb can be better than ±0.0034, ±0.0046 and ±0.0100 (n=28, 2SD) for content of 5–20ng Pb samples respectively. 187Os/188Os isotopic ratios are determined under negative thermal ions mode with the precision of better than 0.2‰ for approximately tens of pg, and 20ppm for ~ng. In addition, Cr isotopes can also be measured by TIMS technique in the static multicollection mode, the precision of 50Cr/52Cr, 53Cr/52Cr, 54Cr/52Cr ratios attain to 1ppm, 2ppm and 2ppm respectively. These methods include different isotope systematics relate to lithophile and siderophile elements, long-lived radionuclides and the short-lived extinct radionuclides. And they will provide support for further study on Antarctic meteorites.

Key words: TIMS, meteorites, Antarctic, application prospects

Peng Li，Wang Guiqin，Jiang Xiaoying，Lai Yongwang. THE PROSPECT OF HIGH-PRECISION THERMAL IONIZATION MASS SPECTROMETRY(TIMS) APPLICATIONS IN ANTARCTIC METEORITES[J]. ADVANCES IN POLAR SCIENCE, 2013, 25(4): 425-435.

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