Precambrian_lecture - Previously accumulated daughter argon...

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Previously accumulated daughter argon is driven out of very hot basaltic lava during eruption.
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Basalt lava quickly cools and crystallizes, after which radiogenic Ar begins to accumulate once again.
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Magma comprising a batholith cools very slowly.
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Geologic map of Texas. The black area at the center is the Llano Uplift.
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In this geologic map of the Llano Uplift, yellow, green, and blue refer to types of metamorphic rock. Red refers to granite batholiths. White (uncolored) refers to sedimentary rock.
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GEO 303 field trip to the Llano Uplift, Saturday, February 27. Free chartered bus.
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Geologic Time Scale. Each column to the right is an expansion of the upper portion of the column to its left.
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First, we consider the age of the solar system (including planet Earth).
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Material condensing in the early disk phase of the solar system
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0.5 cm Slab of Allende stony meteorite Earliest material to condense: 4567.11 ± 0.15 million years (± 0.003%!) 0.5 mm
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The oldest known minerals are ~ 4.4 billion year old zircon
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Precambrian_lecture - Previously accumulated daughter argon...

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