GEOL 001 Lecture Notes - Lecture 11: Source Rock, Shear Stress, Phanerozoic
20 Dec 2020
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Document Summary
Daughter product the isotopes resulting from the decay of a parent. Half-life the time required for one-half of the radioactive nuclei in a sample to decay. The percentage of radioactive atoms that decay during one half-life is always the same (50%) However, the actual number of atoms that decay continually decreases. Comparing the ration of parent to daughter yields the age of the sample. Carbon-14 is produced in the upper atmosphere. Useful tool for anthropologists, archaeologists, and geo. who study recent. Phanerozoic ( visible life ) the most recent eon, which began about. Hadean the oldest eon (mostly molten, but maybe ocean surface) Difficulties in dating the geologic time scale. Not all rocks can be dated by radiometric methods. The age of a mineral grain in a sedimentary rock represents the age of the source rock. The age of a particular mineral in a metamorphic rock may not necessarily represent the time when the rock formed.
