Lead Isotopic Ages of Chondrules and Calcium-Aluminum-Rich Inclusions-Reference-Cited by-同舟云学术

Lead Isotopic Ages of Chondrules and Calcium-Aluminum-Rich Inclusions

Published:2002-09-06 Issue:5587 Volume:297 Page:1678-1683
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Amelin Yuri¹,Krot Alexander N.²,Hutcheon Ian D.³,Ulyanov Alexander A.⁴

Affiliation:

1. Department of Earth Sciences, Royal Ontario Museum, Toronto, ON M5S 2C6, Canada.

2. Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, HI 96822, USA.

3. Lawrence Livermore National Laboratory, Livermore, CA 94451, USA.

4. M. V. Lomonosov Moscow State University, Moscow 117999, Russia.

Abstract

The lead-lead isochron age of chondrules in the CR chondrite Acfer 059 is 4564.7 ± 0.6 million years ago (Ma), whereas the lead isotopic age of calcium-aluminum–rich inclusions (CAIs) in the CV chondrite Efremovka is 4567.2 ± 0.6 Ma. This gives an interval of 2.5 ± 1.2 million years (My) between formation of the CV CAIs and the CR chondrules and indicates that CAI- and chondrule-forming events lasted for at least 1.3 My. This time interval is consistent with a 2- to 3-My age difference between CR CAIs and chondrules inferred from the differences in their initial 26 Al/ 27 Al ratios and supports the chronological significance of the 26 Al- 26 Mg systematics.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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