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Download Origin of Earth/ Hadean Eon
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The Precambrian Origin of Earth/ Hadean Eon Brad Hubeny Precambrian Cratons and Shields The Big Band & Origin of Universe ~13.7 Billion Years Ago Origin of the Solar System: The Nebular Hypothesis The Nebular Cloud and Different Initial Compositions 4.56 Ga BP 1 Evolution of Early Earth The Moon The Early Earth The Moon’s Origin (4.5 Ga) Why Oceanic Crust in Hadean? • Formed 4.5 Ga • Similar in Composition to Mantle: So What?!? • Lightly-Cratered Maria younger than 3.8 Ga: So What?!? How old is the crust? Zircon Crystal: 4.2 Ga BP (Iizuka et al., 2006) Acasta Gneiss, Slave Province, NWT 2 Jack Hills, W. Australia (4.4-4.5Ga!!) 3
