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Precambrian_lecture - 4567.11 ± 0.15 million years(±...

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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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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 the 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:
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Unformatted text preview: 4567.11 ± 0.15 million years (± 0.003%!) 0.5 mm Sedimentary strata The Grand Canyon of the Colorado River Precambrian igneous and metamorphic basement Unconformity Unconformity Slightly metamorphosed strata below an unconformity in Colorado were deformed so that they stand vertically today. Northern Canada is deeply eroded to a level plain just above sea level. Before erosion, northern Canada (preceding image) may have looked like the Austrian Alps shown here. On the ground, a Precambrian shield is seen to have low elevation and low topographic relief (Ontario, Canada). Precambrian shields worldwide. Every continent has at least one shield. A gold mine in Brazil. Precambrian shields are rich in ore deposits (the mining industry, not oil and gas)....
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