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Radioactive dating of rocks

And how can we know how much radioactive decay occurred in their mantle source before these lavas erupted?If the youngest lavas inherited all of their supposed radioactive decay age, then so could the “ancient” lavas.That is, their rubidium-strontium composition has nothing to do with their age, but everything to do with their source!However, the molten rock that produced the “ancient” Cardenas Basalt lavas also came from the same region of the earth’s mantle beneath the Grand Canyon.

Worse still, their rubidium-strontium isochron age is 1,143±220 million years!

These were once molten lavas that were successively erupted onto the earth’s surface through volcanic vents and fissures and flowed over already deposited layers of siltstones.

They quickly hardened into the dense, black rock called basalt .

However, what ages do these same methods yield when applied to rocks for whose formation there are independent cross-checks? There are up to 160 volcanic cones on the plateau to the north of the Canyon rim out of which these basalt lavas flowed.

The eruptions were so recent, occurring after the Grand Canyon formed, that some of these basalt lava flows cascaded like molten waterfalls over the Canyon rim, down the Canyon walls and into the Canyon, where they formed dams that temporarily blocked the flow of the Colorado River .


  1. Apr 24, 2017. Most people today think that geologists have proven the earth and its rocks to be billions of years old by their use of the radioactive dating methods. Ages of many millions of years for rocks and fossils are glibly presented as fact in many textbooks, the popular media, and museums. For decades, the.

  2. Aug 9, 2000. Radioactive Dating. The technique of comparing the abundance ratio of a radioactive isotope to a reference isotope to determine the age of a material is. of dating, developed in 1966, measures the amount of 40Ar arising from the 40K decay and is compared to the amount of 40K remaining in the rock.

  3. Radiometric dating. Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks. Radioactive elements decay. The universe is full of naturally occurring radioactive elements. Radioactive atoms are inherently unstable; over time, radioactive "parent.

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