Mt ngauruhoe radiometric dating are handsome men intimidating

13 Mar

As in the previous example from the Lesser Antilles, geologists are interested in these isotope ratios primarily to learn about the history of subduction, composition of the mantle, and how oceanic sediments and crust are incorporated back into the mantle.

For that purpose, isotopes of Sr, Rb, Sm, Nd, and Pb are extremely useful (e.g.

In other words, geologists can use independent lines of evidence to study the history of these rocks: one isotopic system (U-Pb) to date the rocks and several others (Sr-Rb, Sm-Nd, Lu-Hf, etc.) to distinguish the origin and ascent of the magma.

As an aside, the oldest zircons to date were found in the Jack Hills of western Australia and date as old as 4,404±4 million years (see the PDF of the original article by Wilde et al., 2001).

In the sciences, we call this "shaking the box"—that is, to perform laboratory analyses just to see how the data will look and then describe the reasons for any trends retrospectively.

Nonetheless, even though Snelling claims that the samples were not expected to yield age information, he understands that these isotopes are radiogenic (produced by radioactive decay) and thus change over time. Snelling believes that radioactive decay occurred a million times faster within the past ~6,000 years, so within his own paradigm, these isotope ratios should reflect the passage of time somehow.

Another comes from the re-dating of historical volcanic basalts in New Zealand using the Ar-Arg method (Cassata et al., 2008; discussed on my blog here). (2011), whose K-Ar, Ar-Ar and radiocarbon dates (~30,000 years) of volcanic flows and wood fragments all overlap, further corroborates my point that g The only geochronological tool employed by Dr.Conversely, Young-Earth models do not predict the isotopic data at volcanic island arcs, primarily because they offer no model by which the mantle and crust evolved to drastically different isotopic values.Ratios of radiogenic isotopes can be combined with geochronological data (radiometric dates) to elucidate tectonic processes over time.Why not offer a means by which to test the young-earth model with the new isotope data?Unfortunately for Snelling, no such test exists, but with a handful of tables and verbose petrological descriptions, he is successful in misdirecting his audience.