L03_9_Sept_Systems_Diagrams_and_Formation_Age_Earth

First well come up with some parameters of decays r

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Unformatted text preview: y go wrong? 45 A problem with the salt method: It does not take into account recycling of elements (including salts) caused by plate tectonics Subduc;on zone 46 A problem with the cooling method: It does not account for heat con;nuously produced inside of the Earth by radioac;ve decay: 235U à༎ 207Pb + 7 4He + heat (half- life 703.8 million years) “Parent” “Daughter” isotopes isotope (A nuclear reactor is powered by the same heat from radioac;ve decay. The heat converts water to steam, which drives turbines, which generate electricity.) Radiometric Da;ng of Minerals The basic idea: 1)  Choose a mineral that incorporates a parent radioisotope, but not it’s daughter isotope 2)  The mineral must be such that it ‘retains’ the daughter isotope 3)  Measure the amount of parent and daughter nuclides in the mineral to determine the age ini;al mineral: only parent nuclides 48 Radiometric Da;ng of Minerals The basic idea: 1)  Choose a mineral that incorporates a parent radioisotope, but not it’s daughter isotope 2)  The mineral must be...
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This document was uploaded on 03/26/2014 for the course GEC AS.270.103 at Johns Hopkins.

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