W10_103_6b_Hadean1

W10_103_6b_Hadean1 - The Hadean & Archean Its the Earth...

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“It’s the Earth Jim, but not as we know it.” Hadean & Archean: 2500-4600 Myrs Era Age (Myrs) Epoch 0.01 Holocene 1.8 Pleistocene 5.3 Pliocene 23.8 Miocene 33.6 Oligocene 54.8 Eocene 65 Paleocene 144 206 248 290 323 354 417 443 490 543 2500 3800 P r e c a m b r i a n P h a n e r o z o i c Eon Proterozoic Archean Hadean Period Quaternary Tertiary Neogene Paleocene Mississippian C e n o z o i c M e s o z o i c P a l e o z o i c Cretaceous Jurassic Age of the Earth 4600 Myrs (4.6 Byrs) Source: Geological Society of America (1999) Geologic Time Scale Devonian Silurian Ordivician Cambrian Triassic Permian Pennsylvanian
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Archean Divided into: Hadean/Archean “Evidence” Problems • Very few rocks/minerals exist from this period • Most have been metamorphosed, or buried • No fossils exist in Hadean, Minimal in Archean Rely on: Few rocks that we have Moon, Meteorites Models 4.4 Gyr Zircon Crystal
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Rocks Older than 2.5 Gyrs The Neighborhood: “Dim” Sun
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The Neighborhood: “Near” Moon = Shorter Day About 6-10 hrs Origin of the Moon: 4.5 Gyrs
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Lunar Evidence Moon does not orbit around the earth’s equator The moon is retreating from the Earth (but could never have been closer than 24,000 km) Moon is depleted in iron and “iron-loving” elements (it has a low density) Moon is dry (no water in the minerals)
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W10_103_6b_Hadean1 - The Hadean & Archean Its the Earth...

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