For the following mark whether it is an example of absolute time (A) or relative
ID: 160210 • Letter: F
Question
For the following mark whether it is an example of absolute time (A) or relative time (R):
(a) U-Pb ages of the youngest detrial zircons from the Novato Quary of the Franciscan Complex of are 83 million years old.
(b) The Miocene Briones formation is folded, so this means the folding is younger than the deposition of this formation.
(c) Sm-Nd ages of garnet-amphibolites of the Ballantrae Complex show that these rocks were metamorphosed 472 million years ago.
(d) The Moraga volcanics overlie the Orinda Formation indicating that the Moraga volcanics are younger than the Orinda Formation.
(e) Ar-Ar ages of the oldest metamorphic rocks of the Franciscan Complex show that this metamorphism took place 140-165 million years old.
(f) The Hayward fault displaces the Coast Range ophiolite indicating that the age of faulting is younger than the Coast Range ophiolite.
Explanation / Answer
For the following mark whether it is an example of absolute time (A) or relative