Demonstrably, these eruptions occurred really recently, after the Canyonaˆ™s levels were deposited (Figure 3). These basalts yield years all the way to 1 million years using the levels of potassium and argon isotopes from inside the rocks. Nevertheless when we date the stones by using the rubidium and strontium isotopes, we have an age of 1.143 billion many years. Here is the same get older we see for all the basalt layers deeper below the walls in the eastern big Canyon.4
Just how could both lavasaˆ”one at the very top and another at the bottom in the Canyonaˆ”be alike get older centered on these father or mother and girl isotopes? One solution is that both previous and early lava passes inherited the exact same rubidium-strontium chemistryaˆ”not ageaˆ”from exactly the same supply, deep in earthaˆ™s upper mantle. This source currently had both rubidium and strontium.
To make issues worse yet for the claimed dependability of these radiometric matchmaking practices, these same basalts that flowed from the the top of Canyon produce a samarium-neodymium age about 916 million many years,5 and a uranium-lead age of about 2.6 billion ages!6