Zircon dating

Zircon dating

Rock ages obtained by these dating methods, usually ranging from millions to billions of years, directly contradict belief in a 6,000 year old earth. In effect, young-earth creationists of the 21st century finally accepted what mainstream science had known since the early 20th century, namely that nuclear decay was the best and perhaps only viable explanation for the isotopic patterns observed in rocks and minerals today.

For years, the young-earth community had attempted to discredit radiometric dating by essentially claiming that very little nuclear decay has occurred since the formation of the earth. Conceding the occurrence of billions of years’ worth of nuclear decay created a major dilemma for people believing in a 6,000-year-old earth.

Subsequently, intensities were measured in 15 magnet cycles.

Isotopic ratios are then calculated using raw intensities corrected for electron multiplier dead-time and drift-corrected mid-analysis values.

The ancient Australian crystals date back to just 165 million years after Earth formed, and have survived tumbling trips down rivers, burial deep in the crust, heating, squeezing and a tectonic ride back to the surface.

The Australian zircons, from the Jack Hills, aren't the oldest rocks on Earth — those are in Canada — but about 3 billion years ago, the minerals eroded out some of Earth's first continental crust and became part of a riverbed.

However, this strategy began to change in 1997, when Dr. The only possible solution, apart from abandoning a young-earth position altogether, was to postulate that nuclear decay rates were accelerated in the recent past.

If the crystals were really 1.5 billion years old the helium should have all diffused out into the surrounding mineral formations. and I will not repeat most of those issues here, beyond mentioning that there are some serious questions as to how RATE calculated the ratios of theoretical to actual residual helium contents in the zircons Any valid scientific theory must have predictive power.

To test the hypothesis, researchers sought cases in which nuclear decay could be compared against some other natural phenomenon.

Think of radioactive nuclei as a clock that ticks (i.e. The only way to demonstrate that nuclear processes “ticked” faster in the past was to compare their decay rates to another, more accurate clock.

The sequence is as follows: In order to stabilize the secondary ion signal and to remove surface contamination, the primary beam is focused on the sample surface for a certain time period prior to data acquisition.

In this example (right), the duration of the presputtering was 3 min.

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The argument, presented in a creationist journal goes like this: The rock formation is radiometrically dated at about 1.5 billion years of age.

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