Potassic, high-silica Hadean crust
Journal Article
·
· Proceedings of the National Academy of Sciences of the United States of America
- Univ. of Chicago, IL (United States)
- Univ. of California, Los Angeles, CA (United States)
- Berkeley Geochronology Center, CA (United States)
- Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
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
Cited by: 23 works
Citation information provided by
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