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Title: Potassic, high-silica Hadean crust

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America

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.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1491658
Report Number(s):
LLNL-JRNL-723544; 871768
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 115, Issue 25; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Cited By (5)

Probable Cold and Alkaline Surface Environment of the Hadean Earth Caused by Impact Ejecta Weathering journal January 2020
Resonance ionization of titanium: high useful yield and new autoionizing states journal January 2018
Archean granitoids of the Bastar Craton, Central India journal January 2019
Ideas and perspectives: Development of nascent autotrophic carbon fixation systems in various redox conditions of the fluid degassing on early Earth journal January 2019
Titanium isotopes as a tracer for the plume or island arc affinity of felsic rocks journal January 2019

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