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Geologic Time, Fossils, and Earth History
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AS.129 Geologic Time, Fossils, and Earth History
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Research Summary: Zircon crystals in a granite give an age of 300 Ma, while mica from the same granite gives an age of 280 Ma. Zircon closes to isotopic resetting at a higher temperature than mica. Which interpretation is best?
A
The mica age proves the zircon age is impossible, when the displayed data and experimental conditions are considered
B
Both minerals give fossil succession ages, within the range and context provided by the passage
C
The granite crystallized near 300 Ma and cooled below mica closure by 280 Ma
D
The granite must have formed at 280 Ma and never cooled, for the particular investigation and evidence presented here
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