Relative age dating geologic cross sections


30-Nov-2017 06:23

Figure 1 shows a typical discoloration halo around a radioactive mineral inclusion in the mineral pyroxene.

As igneous rocks cool, mineral crystals form following a specific sequence.This was never fully successful as the size/intensity of an observed damage halo was also a function of the abundance of radionuclides present in the inclusion, and the crystalline structure of the host mineral. First is his contention that the granitic rocks from which samples reportedly came constitute the "primordial" crust of the Earth.



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