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The Earth's early evolution

S A Bowring¹, T Housh

¹Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge 02139, USA.

Science (New York, N.Y.)

|September 15, 1995

Summary

Analysis of ancient rock data suggests Earth

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Area of Science:

Geochemistry and Petrology
Planetary Science
Earth Sciences

Background:

The Archean crust provides crucial geochemical insights into Earth's early differentiation processes.
A key question is whether current continental crust volume reflects all crust formed or if creation and destruction have balanced since the Archean.

Purpose of the Study:

To investigate the extent of crustal recycling in Earth's history.
To understand the evolution of the Earth's mantle and its primordial heterogeneities.

Main Methods:

Analysis of neodymium isotopic data from the oldest preserved Archean crustal remnants.

Main Results:

Neodymium isotopic data indicate significant crustal recycling throughout Earth's history.
Preserved continental crust consists of fragments that avoided recycling.
Earth's mantle isotopic evolution shows the progressive removal of primordial heterogeneities from early differentiation.

Conclusions:

Crustal recycling plays a vital role in shaping the Earth's crustal volume.
The Earth's mantle has undergone significant isotopic evolution, erasing early differentiation signatures.

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