Geologic age dating methods
Geologic age dating methods - list of dating sites in qatar
Results obtained usually signify the "date" of the metamorphism, but they may also yield the "age" of the original volcanic (or sedimentary) rock.The "age" or "date" is calculated from the amount of the daughter isotope produced by radioactive decay of the parent isotope.
It is also claimed that the original basalt lavas were erupted between 17 Ma, based on U-Pb dating of "original" zircon grains in metamorphosed felsic (granitic) volcanic layers within the Brahma and Rama Schists.
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Radiometric dating isn't the only method of determining the age of rocks.
In some outcrops pillow structures have been preserved, testimony to the basalt lavas having originally erupted and flowed under water onto the Creation Week ocean floor.
Metamorphic rocks are not always easy to date using radio-isotopes.
Twenty-seven Brahma amphibolite samples were collected from various Inner Gorge outcrops as part of the RATE (Radioisotopes and the Age of The Earth) project.
These included seven samples from a 150 meter long and 2 meter wide amphibolite body outcropping just upstream from the mouth of Clear Creek at river mile 84 (measured from Lees Ferry).
All 27 samples were sent to two well-credentialed internationally-recognized, commercial laboratories for radioisotope analyses—potassium-argon (K-Ar) at a Canadian laboratory, and rubidium-strontium (Rb-Sr), samarium-neodymium (Sm-Nd), and lead-lead (Pb-Pb), at an Australian laboratory.
Both laboratories use standard, best-practice procedures on state-of-the-art equipment.
Among these metamorphosed volcanic strata are amphibolites, belonging to the Brahma Schist.
These were originally basalt lava flows several meters to tens of meters thick.
But this sediment doesn't typically include the necessary isotopes in measurable amounts.