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Related Experiment Video

Updated: Feb 9, 2026

Preparation of Functional Silica Using a Bioinspired Method

Preparation of Functional Silica Using a Bioinspired Method

Published on: August 1, 2018

Potassic, high-silica Hadean crust.

Patrick Boehnke^1,2, Elizabeth A Bell³, Thomas Stephan^4,2

¹Department of the Geophysical Sciences, The University of Chicago, Chicago, IL 60637; pboehnke@gmail.com tmark.harrison@gmail.com.

Proceedings of the National Academy of Sciences of the United States of America

|June 6, 2018

Summary

Early Earth's crustal composition is revealed by analyzing strontium isotopes in ancient zircons. This research indicates a diverse range of igneous rocks existed by 4.2 billion years ago, impacting early planetary conditions.

Keywords:

Nuvvuagittuq early Earth habitability hadean zircons

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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices

Published on: March 27, 2019

Area of Science:

Geoscience
Early Earth studies
Isotope geochemistry

Background:

Understanding the Hadean (>4 Ga) Earth's crust is crucial for reconstructing early planetary conditions.
The composition of the early crust and its associated volatiles influenced the atmosphere, oceans, and nutrient cycles.
Limited data and consensus exist regarding the nature of the Hadean crust.

Purpose of the Study:

To investigate the composition of the Hadean crust.
To provide insights into the petrogenesis of early Earth's crustal rocks.
To constrain the timing of crustal differentiation processes.

Main Methods:

Analysis of the 87Sr/86Sr ratio in apatite inclusions within Archean zircons.
Utilizing samples from the Nuvvuagittuq Supracrustal Belt, Canada.
Radiometric dating techniques to establish temporal constraints.

Main Results:

Evidence for a high rubidium/strontium (Rb/Sr) ratio reservoir (>1) by at least 4.2 Ga.
The protolith of the analyzed zircons indicates early crustal differentiation.
The findings suggest the presence of a wide spectrum of igneous rock compositions.

Conclusions:

The Hadean crust was not uniform and encompassed a broad range of igneous compositions, from mafic to highly silicic.
Early-formed crustal reservoirs influenced the subsequent evolution of Earth's surface environment.
This study provides critical geochemical evidence for early crustal heterogeneity.