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Anais da Academia Brasileira de Ciências

Print version ISSN 0001-3765On-line version ISSN 1678-2690

Abstract

SIQUEIRA-RIBEIRO, MARLI C.; MARIN, DANIELI F.C.; HACKSPACHER, PETER C.  and  STUART, FINLAY M.. The performance of the (U+Th)/He thermochronology laboratory at UNESP Rio Claro, Brazil. An. Acad. Bras. Ciênc. [online]. 2019, vol.91, n.1, e20170397.  Epub Mar 21, 2019. ISSN 0001-3765.  https://doi.org/10.1590/0001-3765201920170397.

We have developed the first laboratory for (U-Th-Sm)/He thermochronology measurements in South America. Helium is measured using a high-sensitivity magnetic sector mass spectrometer (GVI-Helix-SFT) and a double focusing single collector inductively coupled plasma mass spectrometer (Thermo Scientific ELEMENT2) is used for U, Th and Sm determinations. Repeated analyses of fragments of Durango fluorapatite crystals yields an average age of 31.6 ± 1.6 Ma (2σ) (n=62). This overlaps the long-term average of Durango fluorapatite measured in laboratories worldwide. The analysis of multiple single apatite crystals of a Precambrian basement sample from Serra do Mar, southeastern Brazil, yields an average He age (60.5 ± 8.7 Ma; n=8) that overlaps that measured in the SUERC laboratory (59.6 ± 3 Ma; n=3). This confirms that the UNESP laboratory is capable of routinely measuring the (U-Th-Sm)/He ages of single apatite crystals.

Keywords : (U-Th)/He dating; He calibration; Noble Gas; Serra do Mar AHe ages.

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