Lecture 5: In the Beginning: Radiometric Dating 1.The Age of the Earth 2.Radiometric dating - early chronology.

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Presentation transcript:

Lecture 5: In the Beginning: Radiometric Dating 1.The Age of the Earth 2.Radiometric dating - early chronology

Meteorites - the stories they tell The Meteorite “Allende” (fell in 1969, Mexico) is ~30 Ma older than the Earth, and has isotopes from a Supernova that exploded ~4.60 Ga ago !

The Oldest Rocks on Earth The age of our Sun Sun’s age = million years (= 4.56 Ga) helioseismology The age of our Earth Earth’s age = million years radiometric dating of rocks

The Formation of the Earth Precise timeline of early events.

Radiometric Dating Radioactive 40 K decays to 40 Ar. Half-life: 1.25 Ga.

The Periodic Table

Radiometric Dating

Radioactive 238 U decays to 206 Pb. Half-life: 4.5 Ga.

Radiometric Dating This zircon is Ga old, and so are the rocks in which it was.

Main points to take home: 1) The Earth formed ~30 Myr after the Sun, about Myr ago 2)Radioactive decay - a reliable chronometer.