NUR--A Possible Proxy for CHUR Reference for the Re-Os System Derived from 187Os/188Os Ratio of the Allende CAI

Details NUR--A Possible Proxy for CHUR Reference for the Re-Os System Derived from 187Os/188Os Ratio of the Allende CAI NUR--A Possible Proxy for CHUR Reference for the Re-Os System Derived from 187Os/188Os Ratio of the Allende CAI

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1475y&link_type=abstract

Lunar and Planetary Science, volume 27, page 1475

Other

Bulk Solar System (Bss), Calcium-Aluminum-Rich Inclusions, Chur, Nuggets Uniform Reservoir (Nur), Osmium-187, Osmium-188, Rhenium/Osmium

Scientific paper

The knowledge of the evolution of 187 Os/188 Os and 187 Re/188 Os ratios in various reservoirs, such as bulk solar system (BSS), bulk earth (BE) and the bulk silicate earth (BSE) is important for the development of the Re-Os systematics as a geochemical tool. The Re/Os ratios in carbonaceous chondrites are unfortunately not constant and cannot be used to uniquely define the average solar system 187 Os/188 Os evolution similar to the chondritic 143 Nd/144 Nd evolution (CHUR). The Re/Os ratios in Ca, Al-rich inclusions (CAIs) of CV3 carbonaceous chondrites appear to be unfractionated both in macro- and micro-scale. Considering that the CAIs are the oldest materials found in the solar system, and Re and Os are among the first elements to condense from a gas of solar composition, the 187 Os/188 Os and 187 Re/188 Os ratios of CAIs in CV meteorites may be more representative for BSS evolution than individual meteorites. The Os isotopic composition of type B CAI from the Allende meteorite (A44) is shown to be very close to previous estimates for the chondritic reservoir by other methods. Since the noble metal budget in CAIs is controlled by tiny refractory metal Nuggets, we use the acronym NUR (a German equivalent for ONLY) for the Uniform Reservoir for the Re-Os system to characterize the average solar system evolution of 187 Os/188 Os. The proposed values for NUR are (187 Os/188 Os)NUR=0.12736 +/- 0.00016 (corresponding to 187 Os/186 Os=1.0622 +/- 0.0013) and (187 Re/188 Os)NUR =0.3952 +/- 0.0055 respectively.

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