A Caltech Library Service

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.

[img] PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


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
Burnett, D. S.0000-0001-9521-8675
Additional Information:© 2000 Meteoritical Society. Provided by the NASA Astrophysics Data System.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
Issue or Number:S5
Record Number:CaltechAUTHORS:20150507-071022957
Persistent URL:
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
Deposited By: Ruth Sustaita
Deposited On:08 May 2015 04:53
Last Modified:09 Mar 2020 13:18

Repository Staff Only: item control page