1st NERC IAPETUS Isotope Workshop, University of Glasgow (23rd- 24th November 2016)
The use of 187Re-187Os isotopes in revealing magmatic processes on
N. M a r i 1, L . H a l l i s 1, A . R i c h e s 2, M . L e e 1
1Sc h o o l o f G e o g r a p h ic al and Earth Sciences, U n i v ers ity of Glasgow, UK ; 2Department
of E a r t h S c i e n c e s , Dur ham University, UK
Rhenium and osmium are highly siderophile elements (HSE) that can help in revealing
the genesis of asteroidal and planetary cores and mantles. In particular, the
187Re-187Os isotope system can be used to answer key issues in planetology and
cosmochemistry, as insights on core formation, early differentiation, and late accretion
events in terrestrial planets (Shirey and Walker, 1998; Righter et al., 2000).
Studying the Re-Os systematics on Martian meteorites is critical for an understanding
of the mantle evolution of Mars, and to constrain whether one or more magmatic
reservoirs derived from crystallization of a magma ocean. The similar content in Os in
terrestrial and Martian basalts would argue that the sources for both planets had the
same abundances in Os and HSE, this is also true for ultramafic rocks on Mars and
Earth (Birck & Allegre, 1994; Warren & Kallemeyn, 1996). Thus, Os isotopes can be
used to obtain the relative abundance of Re and Os on Earth as well on Mars,
assuming the very similar HSE content of both mantles (Shirey & Walker, 1998).
Shirey S. B. & Walker R. J., 1998. The Re-Os isotope system in cosmochemistry and high-
temperature geochemistry. Annu. Rev. Earth Planet. Sci., vol. 26, pp. 423-500.
Righter K., Walker R. J., and Warren P. H., 2000. Significance of highly siderophile elements and
osmium isotopes in the lunar and terrestrial mantles. Origin of the Earth and Moon (R. M. Canup and
K. Righter, eds.), pp. 291-322, University of Arizona press.
Birck J. L., Allegre C. J., 1994. Contrasting Re/Os magmatic fractionation in planetary basalts. Earth
Planet. Sci. Lett., vol. 124, pp. 139-48.
Warren P. H., Kallemeyn G. W., 1996. Siderophile trace elements in ALHA84001, other SNC
meteorites and eucrites: evidence of heterogeneity, possibly time-linked, in the mantle of Mars.
Meteor. Planet. Sci., vol. 31, pp. 97-105.