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Construction of mass-age curves for the continental crust: An empirical model and an example from the western USThe methodology of determining crustal mass-age curves is discussed. Problems in doing this include determination of model ages and accounting for mixing of materials of different ages during crust forming processes. These difficulties can be overcome with some reasonable assumptions and estimates of rock volumes based on areal proportions. This technique was used to construct a reasonably well constrained mass-age curve for the southwestern U.S. based on isotopic measurements on over 100 samples. The results imply that the crust in this area grew episodically at 2.8, 1.8, and 0.1 Ga. It is estimated that it would take on the order of 10000 to 100000 individual Sm-Nd isotopic measurements to carry out a similar exercise for continental crust world wide.
Document ID
19880020829
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Depaolo, D. J.
(California Univ. Los Angeles, CA, United States)
Schubert, G. S.
(California Univ. Los Angeles, CA, United States)
Linn, Ann
(California Univ. Los Angeles, CA, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1988
Publication Information
Publication: Lunar and Planetary Inst., Workshop on the Growth of Continental Crust
Subject Category
Geophysics
Accession Number
88N30213
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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