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190Pt-186Os geochronometer reveals open system behaviour of 190Pt-4He isotope system

A. Luguet1,

1Institute of Geosciences, University of Bonn, Germany

G.M. Nowell2,

2Earth Sciences Department, University of Durham, UK

E. Pushkarev3,

3Russian Academy of Sciences, Institute of Geology and Geochemistry Ural Division, Moscow, Russia

C. Ballhaus1,

1Institute of Geosciences, University of Bonn, Germany

R. Wirth4,

4Helmholtz Centre Potsdam, GeoForschungs Zentrum, Section 3.5 Surface Geochemistry, Potsdam, Germany

A. Schreiber4,

4Helmholtz Centre Potsdam, GeoForschungs Zentrum, Section 3.5 Surface Geochemistry, Potsdam, Germany

I. Gottman3

3Russian Academy of Sciences, Institute of Geology and Geochemistry Ural Division, Moscow, Russia

Affiliations  |  Corresponding Author  |  Cite as  |  Funding information

Luguet, A., Nowell, G.M., Pushkarev, E., Ballhaus, C., Wirth, R., Screiber, A., Gottmann, I. (2019) 190Pt-186Os geochronometer reveals open system behaviour of 190Pt-4He isotope system. Geochem. Persp. Let. 11, 44–48.

Deutsche Forschungsgemeinschaft (LU 1603/5-1, CB 964/36-1) for Luguet and Ballhaus, respectively.
Russian State Scientific programme № АААА-А18-118051190022-4 for Pushkarev.

Geochemical Perspectives Letters v11  |  doi: 10.7185/geochemlet.1924
Received 19 May 2019  |  Accepted 28 August 2019  |  Published 22 October 2019
Copyright © The Authors

Published by the European Association of Geochemistry
under Creative Commons License CC BY-NC-ND 4.0




Figure 1 Bright field image and EDS spectra of Kondyor Pt-Fe alloys and their pure Os exsolution lamellae (FIB-TEM image, GFZ, Potsdam, Germany). The Cu peaks on the EDS spectra are due to the Cu grid that carries the FIB section.
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Figure 2 (a) Variations of 187Os/188Os vs. 187Re/188Os, (b) of 186Os/188Os vs. 190Pt/188Os and (c) of 190Os/188Os vs. 187Re/188Os. The primitive mantle (PM) 186Os/188Os and 187Os/188Os values are respectively from Day et al. (2017)

Day, J.M.D., Walker, R.J., Warren, J.M. (2017) 186Os-187Os and highly siderophile element abundance systematics of the mantle revealed by abyssal peridotites and Os-rich alloys. Geochimica et Cosmochimica Acta 200, 232-254.

and Meisel et al. (2001)

Meisel, T., Walker, R.J., Irving, A.J., Lorand, J.-P. (2001) Osmium isotopic compositions of mantle xenoliths: A global perspective. Geochimica et Cosmochimica Acta 65, 1311-1323.

. If the positive correlation between 186Os/188Os vs. 190Pt/188Os is considered to be an isochronous relationship, it yields an age of 249.8 ± 12 Ma and an intercept of 0.119821 ± 0.000024 (2 sigma) (MSWD = 0.81).
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Figure 3 (a) 186Os/188Os and (b) 187Os/188Os variations with the Os concentrations (1/188Os beam). Red dotted line represents the overprinting of the most pristine Pt-alloy D-S2 by an Os-rich contaminant characterised by 187Os/188Os and 186Os/188Os signatures of Pt-alloy E-S2 (0.12457 and 0.119851, respectively).
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