Carbon dating lava not
The details on the 8 anomalous samples are listed in Table 2 of Dalrymple (1969, p. 51), which is reproduced at Ar-Ar Dating Assumes There is No Excess Argon? Rahmani, 1990, 'Location of Extraneous Argon in Granulitic-facies Minerals: A Paired Microprobe-laser probe 40Ar/39Ar Analysis,' Chem. Radioactive potassium dating measures the ratio between a radioactive variety of potassium and the substance it breaks down into, argon gas. One problem: you need the gas to have been trapped in bubbles of volcanic ash.Martha Foley and Curt Stager discuss the problems of reading the geological clock.But there are some questions that come to mind: Calculus students typically meet this problem somewhere in the second semester.It is one of the simplest examples of a differential equation.Because radiometric dating utterly refutes their biblical interpretations, young-Earth creationists (YECs) are desperate to undermine the reliability of these dating methods.
But once you solidify it in a hard lava flow, in volcanic ash, the radioactive potassium keeps breaking down, but the gas can’t get away.That is, they believe that excess argon will cause rocks and minerals that are supposedly less than 10,000 years old to have 'deceptively' old K-Ar dates of millions or billions of years. In particular, YECs attempt to demonstrate that excess argon is a 'problem' for K-Ar dating by locating examples of historically erupted volcanics, which yield K-Ar dates that are hundreds of thousands or millions of years older than their eruption dates. Brent Dalrymple is a geochronologist with 40 years experience, a pioneer in the identification of excess argon in igneous samples, and an outspoken critic of young-Earth creationism (e.g., Dalrymple, 1984). Bishop James Ussher, a 17th-century Irish cleric, for example, calculated that creation occurred in 4004 B. There were many other such estimates, but they invariably resulted in an Earth only a few thousand years old.By the late 18th century, some naturalists had begun to look closely at the ancient rocks of the Earth.