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25-Nov-2017 17:05

Granites, for example, have more than 10% quartz and abundant potassium feldspar.Other plutonic rocks have less quartz and potassium, and different ratios of calcium and sodium feldspar minerals.The crystals develop an interlocking texture with some of the trace minerals becoming completely surrounded by later forming crystals.Volcanic rocks, because they are able to cool and crystalize rapidly, have a very fine-grained texture; the individual mineral grains are too small to see easily with the naked eye.When these minerals occur as inclusions in certain other minerals, most notably the mica family, they are often seen to develop discoloration, or "pleochroic" haloes.The haloes are caused by radiation damage to the host mineral's crystalline structure.

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Radiation damage haloes around mineral inclusions are well known from the geological literature.s the creation/evolution debate continues, there has been an increasing sophistication of certain Creationist arguments and publications.It can be an especially difficult challenge when the Creationist author has professional credentials and has published in mainstream scientific journals.Granite is a well-known type of plutonic igneous rock, but there are many others as well.

Geologists distinguish these types of rock based on their chemical and mineralogical composition.These haloes were considered to be the result of damage to the crystal structure of the host minerals caused by high energy alpha particles.In numerous papers published in scientific journals in the 1970s and 1980s, Gentry built the case that the different alpha decay energies of various naturally occurring radioactive isotopes resulted in distinctly different halo diameters.Metamorphic rocks represent alterations of precursor sedimentary, igneous, or other metamorphic rocks.



Scientists look at half-life decay rates of radioactive isotopes to estimate when a particular atom might decay. A useful application of half-lives is radioactive dating. This has to do with figuring out the age of ancient things. If you could watch a single atom of a radioactive isotope, U-238, for example, you wouldn't be able to.… continue reading »


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