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Formation of Archean continental crust constrained by boron isotopes

M.A. Smit1,

1Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, 2020-2207 Main Mall, Vancouver V6T 1Z4, Canada

A. Scherstén2,

2Department of Geology, Lund University, Sölvegatan 12, SE- 223 62 Lund, Sweden

T. Næraa2,

2Department of Geology, Lund University, Sölvegatan 12, SE- 223 62 Lund, Sweden

R.B. Emo1,3,

1Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, 2020-2207 Main Mall, Vancouver V6T 1Z4, Canada
3Department of Earth, Environmental and Biological Sciences, Queensland University of Technology, 2 George Street, Brisbane QLD 4000, Australia

E.E. Scherer4,

4Institut für Mineralogie, Westfälische Wilhelms-Universität, Corrensstraße 24, D-48149 Münster, Germany

P. Sprung5,

5Paul Scherrer Institut, Forschungsstrasse 111, CH-5232 Villigen, Switzerland

W. Bleeker6,

6Geological Survey of Canada, 601 Booth Street, Ottawa K1A 0E8, Canada

K. Mezger7,

7Institut für Geologie, Baltzerstrasse 1+3, CH-3012 Bern, Switzerland

A. Maltese7,

7Institut für Geologie, Baltzerstrasse 1+3, CH-3012 Bern, Switzerland

Y. Cai8,

88Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9W, Palisades, NY 10964, USA

E.T. Rasbury9,

9Department of Geosciences, 255 Earth and Space Sciences Building, Stony Brook University, Stony Brook, NY 11794-2100, USA

M.J. Whitehouse10

10Department of Geosciences, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden

Affiliations  |  Corresponding Author  |  Cite as  |  Funding information

Smit, M.A., Scherstén, A., Næraa, T., Emo, R.B., Scherer, E.E., Sprung, P., Bleeker, W., Mezger, K., Maltese, A., Cai, Y., Rasbury, E.T., Whitehouse, M.J. (2019) Formation of Archean continental crust constrained by boron isotopes. Geochem. Persp. Let. 12, 23–26.

NSERC (Discovery Grant RGPIN-2015-04080 to Smit), CFI and BCKDF (Grant 229814 to Smit), NSF (MRI Grant EAR-0959524 to Rsbury), SNF (Grant 17452 to Mezger and Maltese), VR (Grant 2014-06375 to Whitehouse)

Geochemical Perspectives Letters v12  |  doi: 10.7185/geochemlet.1930
Received 11 June 2019  |  Accepted 18 October 2019  |  Published 14 November 2019
Copyright © The Authors

Published by the European Association of Geochemistry
under Creative Commons License CC BY-NC-ND 4.0




Figure 1 Trace element concentrations for the TTG samples and average TTG (Moyen and Martin, 2012

Moyen, J.-F., Martin, H. (2012) Forty years of TTG research. Lithos 148, 312-336.

). All data are normalised to primitive mantle (PM; data in Table S-7).
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Figure 2 (a) B and (b) δ11B versus Zr/Hf with the correlation coefficients for the given regressions.
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Figure 3 Boron isotope data for the analysed samples and terrestrial reservoirs (histograms). Error bars for whole rock analyses are smaller than the symbols. Acasta data represents bulk rock δ11B modelled from biotite data (Supplementary Information, Analytical Methods and Data). The values for reference reservoirs are in Table S-1.
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Figure 4 Cathodoluminescence images of zircon from the Acasta Gneiss Complex samples showing analysed biotite inclusions. The δ11B values of biotite (in ‰) and the 207Pb/206Pb age of the surrounding zircon (minimum inclusion age) are shown. Analytical spots are to scale; asterisk marks >10 % discordance; scale bars are 50 μm. Data are in Table S-9.
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