Yet U-Th-Pb isotopic studies of the uranium ore, host rocks and soils have produced an array of false ‘isochrons’ that yield ‘ages’ which are geologically meaningless.
This makes the task of creationists building their model for the geological record much easier, since claims of U-Th-Pb radiometric ‘dating’ having ‘proven’ the claimed great antiquity of the earth, its strata and fossils can be justifiably ignored.
Radiometric dating has now been used for almost 50 years to establish ‘beyond doubt’ the multi-billion year age of the earth’s geological column.
Although this column and its ‘age’ was firmly settled well before the advent of radiometric dating, the latter has been used to quantify the, ‘ages’ of the strata and the fossils in the column, so that in many people’s minds today radiometric dating has ‘proved’ the presumed antiquity of the earth.
However, it is important to remember that all radiometric dating methods are based on three main assumptions:— The highly speculative nature of all radiometric dating methods becomes apparent when one realizes that none of the above assumptions is either valid or provable.
Hello everyone, The Laacher See complex plinian explosive volcanic eruption (12.9 ky BP, East Eifel Volcanic Field, Germany) appears to be unique in having erupted both representative portions of the zoned chamber magmatic liquids as well as representative cumulates from chamber roof, sides and floor in what seems to be very large amounts.
In most plinian eruptions, it is inferred that less than 1% of the magma chamber volume is erupted in the end.However at Laacher See this proportion is inferred to be at least an order of magnitude larger; and indeed much larger estimâtes are even quoted in the literature on LSE.The Laacher See Eruption has been extensively studied for over 40 years and such case studies seem to fulfill the dream of volcanologists to understand eruptions as well as that of igneous petrologists to constrain the relation between cumulate pile developpement (crystal mush) and the magmatic liquid line of descent.I wonder if anyone has systematically ploughed the literature to assess how "unique" Laacher See complex plinian explosive eruptions may actually be ?I would be grateful for any pointers or insights into this.As with other radiometric ‘dating’ methods, the U-Pb and Pb-Pb isochron methods have been questioned in the open literature, because often an excellent line of best fit between ratios obtained from a set of good cogenetic samples gives a resultant ‘isochron’ and yields a derived ‘age’ that has no geological meaning.