10. What is the best interpretation of the U-Pb age? (A) Zircon crystallized fro

Question

10. What is the best interpretation of the U-Pb age? (A) Zircon crystallized from melted material when the sandstone was metamorphosed. (B) The zircon crystals had existed as such from the beginning of the earth. (C) Zircon crystals were eroded from even older source rock, and deposited as clastic sedi ment along with quartz grains. (D) Zircon crystals are a product of metamorphism, a process that re places everything. The crystals, and indeed all of the atoms in the quartzite, are not original. 11. How does the U-Pb age of the zircon relate to other major events in earth history? (A) The age dates the origin of the earth. (B) It is older than the age of the oldest known coherent rock (i.e, the old est mineral can be older than the oldest rock). (C) It is younger than the oldest known fossils. (D) A U. Pb age has no meaning because U and Pb have existed from the beginning of time.

Explanation / Answer

10. Answer : B. Explanation : zircon is known to exist from the starting date of earth's existence. It survived through erosion, metamorphism and other heavy processes till date. 11. Answer : A Explanation : since it is from the origin of earth, this dating can give the age of earth.

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