Hadean Earth
This book consolidates the latest research on the Hadean Eon - the first 500 million years of Earth history - which has permitted hypotheses of early Earth evolution to be tested, including geophysical models that include the possibility of plate tectonic
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Hadean Earth
Hadean Earth
T. Mark Harrison
Hadean Earth
123
T. Mark Harrison Department of Earth, Planetary and Space Sciences University of California Los Angeles, CA, USA
ISBN 978-3-030-46686-2 ISBN 978-3-030-46687-9 https://doi.org/10.1007/978-3-030-46687-9
(eBook)
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In memory of Richard Lee “Dick” Armstong
Preface
The seed for this book was sown in 2011 when a scientific publisher approached me with a request to encapsulate what was known about the earliest eon of Earth history—the Hadean—in monograph form. As the offer coincided with a partial sabbatical leave, I was able to cobble together an outline of what such a book should cover. I had to put the project aside in light of research exigencies and returned to UCLA with little more than a publication proposal. Eight years later, I’m glad I did so as the structure of this book is significantly different than what that outline embodied. Of course, this will be broadly true of any review of an active scientific discipline after an eight year interregnum but here the reasons went beyond linear progress in the field—the intellectual goalposts had moved as well. Not only had our knowledge of Hadean zircon geochemistry advanced but thinking about other concepts related to Hadean Earth (Late Heavy Bombardment, lunar origin, crustal growth, etc.) had become far more elastic than was the case in 2011. This evolution led me to see complementary patterns in the way these various paradigms had shifted and became a second organizing principle for this book. As well as describing the present status of investigations of the Hadean lithic record, this work also do
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