Coupled W-182 and Re-187-Os-187 isotopic constraints on the origin of group IIAB, IVA, and IVB iron meteorites

Details Coupled W-182 and Re-187-Os-187 isotopic constraints on the origin of group IIAB, IVA, and IVB iron meteorites Coupled W-182 and Re-187-Os-187 isotopic constraints on the origin of group IIAB, IVA, and IVB iron meteorites

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..601h&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 601.

Computer Science

1

Tungsten Isotopes, Rhenium Isotopes, Iron Meteorites, Constraints, Error Analysis, Static Tests

Scientific paper

We determined the tungsten isotopic composition of samples from three groups of magmatic iron meteorites that have well-constrained crystallization histories and Re-Os isotopic systematics. Samples were chosen to span the range of Ni (and Ir and Os) contents present in each group. Consequently, the meteorites examined for each group are also likely representative of materials that formed over the entire crystallization sequence of each asteroidal core. The object here is to couple previously reported Re-Os isotopic composition data with new W-182 data for the same meteorites. Re-187-Os-187 isochrons provide ages for crystallization or diffusional closure for phases comprising asteroidal cores. They do not, however, provide the age at which metal segregated from silicate. For this task, the short-lived Hf-182-W-182 isotope system may prove useful. The W distribution coefficients between metallic core and silicate mantle are not well constrained and depend on the fraction of silicate melt present and the relative abundance of oxidized W, but are probably greater than about three. Combined, the long- and short-lived chronometers can be used to define the core formation, crystallization and cooling histories of individual asteroidal cores, and consequently provide information about the size of each parent body.

Affiliated with

Also associated with

No associations

Rating

Coupled W-182 and Re-187-Os-187 isotopic constraints on the origin of group IIAB, IVA, and IVB iron meteorites does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Coupled W-182 and Re-187-Os-187 isotopic constraints on the origin of group IIAB, IVA, and IVB iron meteorites, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coupled W-182 and Re-187-Os-187 isotopic constraints on the origin of group IIAB, IVA, and IVB iron meteorites will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-872147