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Origin of Thorium/Uranium Variations in Carbonaceous Chondrites

Goreva, J. S. and Burnett, D. S. (2000) Origin of Thorium/Uranium Variations in Carbonaceous Chondrites. Meteoritics and Planetary Science, 35 (S5). A61. ISSN 1086-9379. https://resolver.caltech.edu/CaltechAUTHORS:20150507-071022957

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Abstract

Thorium-, U-, and Pb-isotopic analyses of a wide variety of planetary materials show that Th/U ratio (by weight) varies from 3.5 to 4.2. It is generally believed that chondritic meteorites contain refractory lithophile elements in a relative proportions close to solar, i.e., CI chondrites [1]. Surprisingly, a number of analyses of different types of carbonaceous chondrites show a large (at least a factor of 3) scatter in Th/U measurements [2]. The widest spread in Th/U is observed in the most primitive materials, CI-type chondrites. Cosmochronological models rely on the precise knowledge of the average solar system Th/U, therefore it is important to achieve a better understanding of the actinide chemistry in chondrites, e.g., what causes the variations in Th/U ratio.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://adsabs.harvard.edu/full/2000M%26PSA..35Q..61GPublisherArticle
ORCID:
AuthorORCID
Burnett, D. S.0000-0001-9521-8675
Additional Information:© 2000 Meteoritical Society. Provided by the NASA Astrophysics Data System.
Issue or Number:S5
Record Number:CaltechAUTHORS:20150507-071022957
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150507-071022957
Official Citation:Origin of Thorium/Uranium Variations in Carbonaceous Chondrites Goreva, J. S. & Burnett, D. S. Meteoritics & Planetary Science, vol. 35, Supplement, p.A61, 2000
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57309
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:08 May 2015 04:53
Last Modified:09 Mar 2020 13:18

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