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Argon argon dating definition
Dating minerals may provide age information on a rock, but assumptions must be made.
K since their formation, or if some or all of it came from the mantle or from other crustal rocks and minerals.
Thus all K-Ar and Ar-Ar "dates" of crustal rocks are questionable, as well as fossil "dates" calibrated by them.
Thus, a granite containing all three minerals will record three different "ages" of emplacement as it cools down through these closure temperatures.
Thus, although a crystallization age is not recorded, the information is still useful in constructing the thermal history of the rock.
This technique allows the errors involved in K-Ar dating to be checked.
Argon–argon dating has the advantage of not requiring determinations of potassium.
A viable interpretation of these Broken Hill data was only produced because assumptions were made about the age of the rocks and of a presumed subsequent heating event (based on Pb-Pb and Rb-Sr dating), when it is conjectured that accumulated The six domains are physically distinct units which exhibit wide differences in average physical and chemical properties, as well as structure and tectonic behavior.
They are the lower mantle (below 670km), upper mantle, continental mantle lithosphere, oceanic mantle lithosphere, continental crust and oceanic crust, the latter four constituting the earth's crust. A steady-state upper mantle model has been proposed for mass transfer of rare gases, including Ar.
Thus, discretion and interpretation of age dating is essential.
Ar after cooling past the closing temperature and that this was properly sampled during analysis.