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Formation of Archean continental crust constrained by boron isotopes

Smit, Mattijs ; Scherstén, Anders LU ; Naeraa, Tomas LU ; Emo, Rob ; Sherer, Eric ; Sprung, P ; Bleeker, Wouter ; Mezger, Klaus ; Maltese, A and Cai, Y , et al. (2019) In Geochemical Perspective Letters p.23-26
Abstract
The continental crust grew and matured compositionally during the Palaeo- to Neoarchean through the addition of juvenile tonalite-trondhjemite-granodiorite (TTG) crust. This change has been linked to the start of global plate tectonics, following the general interpretation that TTGs represent ancient analogues of arc magmas. To test this, we analysed B concentrations and isotope compositions in 3.8-2.8 Ga TTGs from different Archean terranes. The 11B/10B values and B concentrations of the TTGs, and their correlation with Zr/Hf, indicate
differentiation from a common B-poor mafic source that did not undergo addition of B from seawater or seawater-altered rocks. The TTGs thus do not resemble magmatic rocks from active margins, which... (More)
The continental crust grew and matured compositionally during the Palaeo- to Neoarchean through the addition of juvenile tonalite-trondhjemite-granodiorite (TTG) crust. This change has been linked to the start of global plate tectonics, following the general interpretation that TTGs represent ancient analogues of arc magmas. To test this, we analysed B concentrations and isotope compositions in 3.8-2.8 Ga TTGs from different Archean terranes. The 11B/10B values and B concentrations of the TTGs, and their correlation with Zr/Hf, indicate
differentiation from a common B-poor mafic source that did not undergo addition of B from seawater or seawater-altered rocks. The TTGs thus do not resemble magmatic rocks from active margins, which clearly reflect such B addition to their source. The B- and 11B-poor nature of TTGs indicates that modern style subduction may not have been a dominant process in the formation of juvenile continental crust before 2.8 Ga. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
TTG, archean, B isotopes, crust formation, continental crust, trace elements, archean tectonics
in
Geochemical Perspective Letters
pages
23 - 26
publisher
European Association of Geochemistry
external identifiers
  • scopus:85087311067
ISSN
2410-3403
DOI
10.7185/geochemlet.1930
language
English
LU publication?
yes
id
aae26c8d-536a-4db4-a420-19a1012c4ba3
date added to LUP
2020-10-21 20:41:48
date last changed
2022-04-27 20:05:58
@article{aae26c8d-536a-4db4-a420-19a1012c4ba3,
  abstract     = {{The continental crust grew and matured compositionally during the Palaeo- to Neoarchean through the addition of juvenile tonalite-trondhjemite-granodiorite (TTG) crust. This change has been linked to the start of global plate tectonics, following the general interpretation that TTGs represent ancient analogues of arc magmas. To test this, we analysed B concentrations and isotope compositions in 3.8-2.8 Ga TTGs from different Archean terranes. The 11B/10B values and B concentrations of the TTGs, and their correlation with Zr/Hf, indicate<br/>differentiation from a common B-poor mafic source that did not undergo addition of B from seawater or seawater-altered rocks. The TTGs thus do not resemble magmatic rocks from active margins, which clearly reflect such B addition to their source. The B- and 11B-poor nature of TTGs indicates that modern style subduction may not have been a dominant process in the formation of juvenile continental crust before 2.8 Ga.}},
  author       = {{Smit, Mattijs and Scherstén, Anders and Naeraa, Tomas and Emo, Rob and Sherer, Eric and Sprung, P and Bleeker, Wouter and Mezger, Klaus and Maltese, A and Cai, Y and Rasbury, E.T. and Whitehouse, Martin J.}},
  issn         = {{2410-3403}},
  keywords     = {{TTG; archean; B isotopes; crust formation; continental crust; trace elements; archean tectonics}},
  language     = {{eng}},
  month        = {{11}},
  pages        = {{23--26}},
  publisher    = {{European Association of Geochemistry}},
  series       = {{Geochemical Perspective Letters}},
  title        = {{Formation of Archean continental crust constrained by boron isotopes}},
  url          = {{http://dx.doi.org/10.7185/geochemlet.1930}},
  doi          = {{10.7185/geochemlet.1930}},
  year         = {{2019}},
}