intro_to_geo_22

intro_to_geo_22 - Geologic time, relative/absolute age...

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Geologic time, relative/absolute age cont. Acquiring an isotopic date Geologists obtain an isotopic date by observing the ratio of unstable parent isotope to the stable daughter product of the reaction within a mineral extracted from the rock of interest and by comparing this ratio to the known half-life for the nuclear reaction For an accurate result, the following conditions must be met: (a) The rock must be young enough so that detectable amounts of parent isotope remain in the mineral, yet old enough so that sufficient amounts of daughter isotope have been produced (b) Since the time of mineral formation, the rock must not have been reheated above the closure temperature of the mineral under study (c) At the time of mineral formation (more technically, the time of cooling through the blocking temperature), the concentration of daughter product within the rock was zero (d) Since the time of mineral formation, neither the parent nor the daughter isotope have been introduced to the mineral crystal under study, the daughter
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intro_to_geo_22 - Geologic time, relative/absolute age...

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