Cited by 267Geological and Geochemical AnalysisGeochemistry and Elemental AnalysisPaleontology and Stratigraphy of Fossils

Geochemical Constraints on the Growth of the Continental Crust

McLennan, Scott M., Taylor, S. R.·1982·The Journal of Geology

Abstract

Several lines of evidence indicate that the Archean upper crust was considerably more mafic than the present-day upper crust. There has been no significant change in REE and Th abundances in post-Archean clastic sedimentary rocks, suggesting that there has been no change in the composition of the upper crust during the post-Archean. This indicates that if there have been any additions to the post-Archean upper crust, they must have had similar composition to the upper crust itself. Geochemical modelling of REE and Th abundances in sedimentary rocks suggests that the minimum ratio of post-Archean to Archean upper crustal composition required to eliminate the Archean upper crustal trace element signature, within analytical uncertainty, is about 4:1. Such a model also is supported by isotopic data. Using plausible assumptions regarding the volume of Archean crust, isostatic relations, and extreme models of the earth's degassing history, it is proposed that approximately 65-75% of the continental crust formed during the period of 3.2-2.5 Ga, and that between 70-85% of the continental crust had formed by 2.5 Ga. Such a model is consistent with relatively constant continental freeboard during the past 2,500 million years. Thus, the constant freeboard model does not provide unique evidence for large-scale recycling of continental material through the mantle.

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Crossref · 10.1086/628690

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  • Assuming crust oxidation (resulting in a present Fe3+ excess of ≈2 × 1021 mol O2 eq) is linked to continental growth, an 'episodic continental growth' model with rapid growth from 10 to 80% of present area 3.2-2.5 Ga would imply a net oxidation rate of ≈2 × 1012 mol O2 eq yr−1.

    “For example, assuming crust oxidation (resulting in a present Fe3+ excess54 of ≈2 × 1021 mol O2 eq) is linked to continental growth, an ‘episodic continental growth' model55 with rapid growth from 10 to 80% of present area 3.2–2.5 Ga would imply a net oxidation rate of ≈2 × 1012 mol O2 eq yr−1 (balanced by a combination of hydrogen escape and organic carbon accumulation).”

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Authors
McLennan, S. M., & Taylor, S. R.
Venue
The Journal of Geology
Published
1982-07
Volume
90
Issue
4
Pages
347-361
ISSN
  • 0022-1376 (ISSN-L)
  • 1537-5269
OpenAlex
W2076229074
Cited by
267
References
57
Citations by year
2026: 6 · 2025: 8 · 2024: 4 · 2023: 10 · 2022: 4 · 2021: 3 · 2020: 10 · 2019: 4 · 2018: 12 · 2017: 6 · 2016: 6 · 2015: 5 · 2014: 5 · 2013: 9 · 2012: 5
FWCI
12.53
Type
journal article
Language
en
Open access
closed
Locations
The Journal of Geology (publishedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
Keywords
crustal growth, mafic crust, rare earth elements, thorium, sedimentary rock, crustal recycling, isostasy, crustal composition

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