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During 17 so-called dome-building eruptions, from 18 October 1980 to 26 October 1986, thick pasty lava oozed out of the volcanic vent like toothpaste from a tube.1 Dacite lava is too thick to flow very far, so it simply piled up around the vent, forming the mountain-like dome, which now plugs the volcanic orifice.

Why does the lava dome provide an opportunity to test the accuracy of radioisotope dating? First, radioisotope-dating methods are used on igneous rocks—those formed from molten rock material. Fossil-bearing sedimentary rock cannot be directly dated radioisotopically.

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Radioisotope dating conveys an aura of reliability both to the general public and professional scientists. In most people’s minds it is the best ‘proof’ for millions of years of Earth history. In August of 1993, with geologist Dr Steven Austin and others from the Institute for Creation Research, I climbed into the crater of Mount St Helens to view the lava dome.

The lava dome at Mount St Helens provides a rare opportunity for putting radioisotope dating to the test.

It sits directly over the volcanic vent at the south end of the huge horseshoe-shaped crater that was blasted out of the mountain by the spectacular eruption on .1 From the crater, the dome appears as a huge steaming mound of dark, block-like rubble.

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Plentyoffish is 100% Free, unlike paid dating sites.Potassium is a common element found in many materials, such as micas, clay minerals, tephra, and evaporites.In these materials, the decay product Ar is able to escape the liquid (molten) rock, but starts to accumulate when the rock solidifies (recrystallizes).It was one of those experiences that was well worth every exhausting moment!The dome (Geology of the Grand Canyon figure, shown in “More and More Wrong Dates”) looks like a small mountain, roughly 1.1 km (¾ mile) long and 350 m (1,100 ft) high.




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