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Sm-Nd and Rb-Sr Chronology of Continental Crust Formation

McCulloch, M. T. and Wasserburg, G. J. (1978) Sm-Nd and Rb-Sr Chronology of Continental Crust Formation. Science, 200 (4345). pp. 1003-1011. ISSN 0036-8075. doi:10.1126/science.200.4345.1003.

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Samarium-neodymium and rubidium-strontium isotopic systematics together with plausible assumptions regarding the geochemical evolution of continental crust material, have been used to ascertain the times at which segments of continental crust were formed. Analyses of composites from the Canadian Shield representing portions of the Superior, Slave, and Churchill structural provinces indicate that these provinces were all formed within the period 2.5 to 2.7 aeons. It has been possible to determine the mean age of sediment provenances, as studies of sedimentary rocks suggest that the samarium-neodymium isotopic system is not substantially disturbed during sedimentation or diagenesis.

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Wasserburg, G. J.0000-0002-7957-8029
Alternate Title:Penultimate Provenances of Crustal Rocks
Additional Information:© 1978 American Association for the Advancement of Science. This article is dedicated to the late A. I. Tugarinov. Many of us have benefited from his scholarship in crustal evolution and geochemistry and from his enthusiasm for science. We are grateful to D. M. Shaw, McMaster University, Hamilton, Ontario, and to W. F. Fahrig, Geological Survey of Canada, for providing us with the important composite samples from the Canadian Shield. S. S. Goldich, G. D. Eberlein, L. A. Haskin, H. A. Lowenstam, and L. T. Silver kindly provided samples of the metamorphic and sedimentary rocks. The sample of the deep sea red clay was obtained through the courtesy of the Scripps Institution of Oceanography. M.T.M. also thanks D. J. DePaolo for assistance and advice. S. B. Jacobsen, D. J. DePaolo, and the reviewers provided constructive criticism of the manuscript. Special thanks to S. R. Taylor for providing sediments with the same provenance as one of us (M.T.M.). Results of this work were presented at the AIGC-Unesco Second Symposium on the Origin and Distribution of the Elements, held in Paris, 1977. This work has been supported by NSF grant PHY76-83685 and NASA grant NGL05-002-188. This is contribution No. 2975 of the Division of Geological and Planetary Sciences of the California Institute of Technology.
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Caltech Division of Geological and Planetary Sciences2975
Issue or Number:4345
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Official Citation:Sm-Nd and Rb-Sr Chronology of Continental Crust Formation M. T. McCulloch and G. J. Wasserburg Science 2 June 1978: 200 (4345), 1003-1011. [DOI:10.1126/science.200.4345.1003]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42314
Deposited By: Ruth Sustaita
Deposited On:08 Nov 2013 16:01
Last Modified:25 Jul 2022 17:29

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