Radiometric dating of crystals inside rocks
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To me it has been a real eye opener to see all the processes that are taking place and their potential influence on radiometric dating.Allanite compositional variability increased dramatically within ca.35 ky of eruption, suggesting an episode of vigorous crystal and/or melt mixing close to eruption (Vazquez and Reid, 2004).While these results underscore the notion that large-volumes of silicic magma can accumulate over short geologic time-spans (cf.Huppert and Sparks, 1988), they also provide showcase examples of complex pre-eruptive histories with unprecedented temporal resolution of processes such as crystallization, magma recharge and thermal rejuvenation in individual caldera systems.The photo above is not to make you feel insignificant, it is only for reference and scale. Depending on your field of view, you would have to be around 100,000 light years away to see this Galaxy using the naked human eye.
And as you got closer, it would almost disappear because of the tremendous amount of space there is between everything, like with atoms.
This suite of techniques allows scientists to figure out the dates that ancient rock strata were laid down and hence, provides information about geologic processes, as well as evolutionary processes that acted upon the organisms preserved as fossils in interleaved strata.
Radioactive decay Radioisotopic dating relies on the process of radioactive decay, in which the nuclei of radioactive atoms emit particles.
By the same token, melt inclusions can be harnessed for insights into processes of magmatic degassing and assimiliation of hydrothermally altered magma chamber rinds. Work has been performed at La Pacana (Chile), the largest known terrestrial resurgent caldera, and at Toba (Indonesia), the source of a ~76 ka eruption thought by some to have pushed the then human population to the brink of extinction ( Rampino and Ambrose, 2000).
Ion microprobe group members are currently involved in studies of large-volume, Quaternary caldera systems underlying Long Valley and Yellowstone (U. Ion microprobe U-Pb zircon age results for the Bishop Tuff (Long Valley; Reid and Coath, 2000) and La Pacana (Schmitt et al., 2002) argue strongly against protracted preeruptive magma storage.
Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.