Sm-Nd and Rb-Sr Chronology of Continental Crust Formation: Times of addition to continents of chemically fractionated mantle-derived materials are determined.
Abstract
Samarium-neodymium and rubidium-strontium isotopic systematics together with plausible assumptions regarding the geochemical evlution 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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Major fractionation of rare earth elements is accomplished during igneous differentiation of rocks from the mantle, resulting in lower parent-to-daughter ratios of crustal products for both the 147Sm/143Nd and 176Lu/177Hf systematics.
“The major fractionation of REE is accomplished during igneous differentiation of rocks from the mantle, resulting in lower parent-to-daughter ratios of the crustal products for both the 147Sm/143Nd (McCulloch and Wasserburg, 1978) and the 176Lu/177Hf (White and Patchett, 1982) systematics.”
From Evolution of Sedimentary Rocks (2014) · cites this paper as McCulloch and Wasserburg, 1978
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Age of meteorites and the Earth
Patterson, C. (1956) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(56)90036-9 · Cited by 559 · see citing works
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The geochemical evolution of the continental crust
Taylor, S. R., & McLennan, S. M. (1995) · Reviews of Geophysics · doi:10.1029/95rg00262 · Cited by 4,643 · see citing works
Evolution of Sedimentary Rocks
Veizer, J., & Mackenzie, F. T. (2014) · Treatise on Geochemistry · doi:10.1016/b978-0-08-095975-7.00715-4 · Cited by 1,592 · see citing works
Bédard, J. H. (2006) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2005.11.008 · Cited by 887 · see citing works
The chemical evolution of Precambrian seawater: evidence from REEs in banded iron formations
Derry, L. A., & Jacobsen, S. B. (1990) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(90)90114-z · Cited by 468 · see citing works
The growth of the continent through geological time studied by Nd isotope analysis of shales
Allègre, C. J., & Rousseau, D. (1984) · Earth and Planetary Science Letters · doi:10.1016/0012-821x(84)90035-9 · Cited by 331 · see citing works
Geochemical Constraints on the Growth of the Continental Crust
McLennan, S. M., & Taylor, S. R. (1982) · The Journal of Geology · doi:10.1086/628690 · Cited by 267 · see citing works
- Authors
- McCulloch, M. T., & Wasserburg, G. J.
- Affiliations
- California Institute of Technology (US)
- Venue
- Science
- Published
- 1978-06-02
- Volume
- 200
- Issue
- 4345
- Pages
- 1003-1011
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2057091716
- Cited by
- 752
- References
- 1
- Citations by year
- 2026: 11 · 2025: 8 · 2024: 13 · 2023: 24 · 2022: 23 · 2021: 24 · 2020: 13 · 2019: 15 · 2018: 13 · 2017: 12 · 2016: 10 · 2015: 13 · 2014: 17 · 2013: 22 · 2012: 8
- FWCI
- 21.66
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Science (publishedVersion)
- PubMed (publishedVersion)
- CaltechAUTHORS (California Institute of Technology) (submittedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Keywords
- continental crust formation, Sm-Nd isotopes, Rb-Sr isotopes, Canadian Shield, Superior Province, Slave Province, Churchill Province, sediment provenance, crustal evolution
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