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Title: Potassic, high-silica Hadean crust

Abstract

We report that understanding Hadean (>4 Ga) Earth requires knowledge of its crust. The composition of the crust and volatiles migrating through it directly influence the makeup of the atmosphere, the composition of seawater, and nutrient availability. Despite its importance, there is little known and less agreed upon regarding the nature of the Hadean crust. By analyzing the 87Sr/ 86Sr ratio of apatite inclusions in Archean zircons from Nuvvuagittuq, Canada, we show that its protolith had formed a high (>1) Rb/Sr ratio reservoir by at least 4.2 Ga. In conclusion, this result implies that the early crust had a broad range of igneous rocks, extending from mafic to highly silicic compositions.

Authors:
ORCiD logo [1];  [2];  [1];  [1]; ORCiD logo [3];  [1];  [1];  [2];  [4]
  1. Univ. of Chicago, IL (United States)
  2. Univ. of California, Los Angeles, CA (United States)
  3. Berkeley Geochronology Center, CA (United States)
  4. Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1491658
Report Number(s):
LLNL-JRNL-723544
Journal ID: ISSN 0027-8424; 871768
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 115; Journal Issue: 25; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; early Earth; Nuvvuagittuq; zircons; habitability; hadean

Citation Formats

Boehnke, Patrick, Bell, Elizabeth A., Stephan, Thomas, Trappitsch, Reto, Keller, C. Brenhin, Pardo, Olivia S., Davis, Andrew M., Harrison, T. Mark, and Pellin, Michael J. Potassic, high-silica Hadean crust. United States: N. p., 2018. Web. doi:10.1073/pnas.1720880115.
Boehnke, Patrick, Bell, Elizabeth A., Stephan, Thomas, Trappitsch, Reto, Keller, C. Brenhin, Pardo, Olivia S., Davis, Andrew M., Harrison, T. Mark, & Pellin, Michael J. Potassic, high-silica Hadean crust. United States. doi:10.1073/pnas.1720880115.
Boehnke, Patrick, Bell, Elizabeth A., Stephan, Thomas, Trappitsch, Reto, Keller, C. Brenhin, Pardo, Olivia S., Davis, Andrew M., Harrison, T. Mark, and Pellin, Michael J. Fri . "Potassic, high-silica Hadean crust". United States. doi:10.1073/pnas.1720880115. https://www.osti.gov/servlets/purl/1491658.
@article{osti_1491658,
title = {Potassic, high-silica Hadean crust},
author = {Boehnke, Patrick and Bell, Elizabeth A. and Stephan, Thomas and Trappitsch, Reto and Keller, C. Brenhin and Pardo, Olivia S. and Davis, Andrew M. and Harrison, T. Mark and Pellin, Michael J.},
abstractNote = {We report that understanding Hadean (>4 Ga) Earth requires knowledge of its crust. The composition of the crust and volatiles migrating through it directly influence the makeup of the atmosphere, the composition of seawater, and nutrient availability. Despite its importance, there is little known and less agreed upon regarding the nature of the Hadean crust. By analyzing the 87Sr/86Sr ratio of apatite inclusions in Archean zircons from Nuvvuagittuq, Canada, we show that its protolith had formed a high (>1) Rb/Sr ratio reservoir by at least 4.2 Ga. In conclusion, this result implies that the early crust had a broad range of igneous rocks, extending from mafic to highly silicic compositions.},
doi = {10.1073/pnas.1720880115},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 25,
volume = 115,
place = {United States},
year = {2018},
month = {5}
}

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