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Hadean Earth (Hardcover, 1st ed. 2020)
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Hadean Earth (Hardcover, 1st ed. 2020)
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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-like behavior. These new observations challenge the
longstanding Hadean paradigm - based on no observational evidence -
of a desiccated, lifeless, continent-free wasteland in which
surface petrogenesis was largely due to extraterrestrial impacts.
The eon was termed "Hadean" to reflect such a hellish environment.
That view began to be challenged in 2001 as results of geochemical
analyses of greater than 4 billion year old zircons from Australia
emerged. These data were consistent with the zircons forming in a
world much more similar to today than long thought and interpreted
to indicate that sediment cycling was occurring in the presence of
liquid water. This new view leaves open the possibility that life
could have emerged shortly after Earth accretion. The epistemic
limitations under which the old paradigm persisted are closely
examined. The book is principally designed as a monograph but has
the potential to be used as a text for advanced graduate courses on
early Earth evolution.
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