Can lava flows be dated by carbon dating
Among impressive volcanic scenery in northern New Zealand lies the city of Auckland. In fact, there are more than 50 recognised small volcanoes in the city and surrounding areas. Evidence based on botany and geomorphology, and a hint from Maori legend that the name can mean 'red sky', contribute to a common acceptance that Rangitoto is youthful.
But the largest volcano by far in Auckland is also the youngest. Some of the lavas (scoria) have no vegetation, and seem to be no more than a few hundred years old.
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).
The 5 samples with excessively old K-Ar dates include a Hualalai basalt from Hawaii (K-Ar 'dates' of 1.05 and 1.19 million years; the basalt erupted in 1800-1801 AD), two Mt.
Etna basalts (a 'date' of 150,000 years for a sample that erupted in 1792 AD and a K-Ar 'date' of 100,000 years for the other sample, which erupted in 122 BC), a plagioclase from Mt.
As part of his seminal work on excess argon, Dalrymple (1969) dated 26 historical lava flows with K-Ar to determine whether excess argon was present.
Geochronology and Thermochronology by the 40Ar/39Ar Method.
So if scientists believe that a creature lived millions of years ago, then they would need to date it another way. They assume dinosaurs lived millions of years ago (instead of thousands of years ago like the bible says).
They ignore evidence that does not fit their preconceived notion.
The age they came back with was only a few thousand years old. And kept their theory that dinosaurs lived "millions of years ago" instead. They then use potassium argon, or other methods, and date the fossils again.
This date did not fit the preconceived notion that dinosaurs lived millions of years ago. They do this many times, using a different dating method each time.Carbon-14 is radioactive and has a half-life of 5,700 years.