Lab Report Lab Report Atomic Dating Using Isotopes Answer the following questions about the results of this activity. Reference: Isotope Half-Life Chart Isotope | Activity 1 – Calibration Place your data from Activity 1 in the appropriate boxes below.
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Or, it may be due to the ions possessing too high a charge to fit the crystal structure of the solid phase such as the triply charged rare earth elements lanthanum (La), cerium (Ce), and yttrium (Y), the quadruply charged ions of titanium (Ti), and zirconium (Zr), or the quintuply charged ions of phosphorus (P), tantalum (Ta), and niobium (Nb). The resultant perlite or pitchstone is useless for the production of flaked stone tools since the rock exhibits preferred planes of cleavage.
As a magma evolves, further melting and crystallization change the nature of the solids, and crystals may form in the liquid which accept the incompatible elements. However, in some lavas, not all the glass will be hydrated and small remnants may occur called marekanites or "Apache Tears", that have not absorbed water (i.e.
Classification scheme of Cox, Bell, and Pankhurst (1980).
While it is theoretically possible to form a glass from most lavas, the presence of aluminum and silicon oxides in rhyolite greatly facilitates the process (Cann 1983; Cox et al. Classification scheme for volcanic rocks based on alkali element and silica content. Calculate the age of the calibration standards using the following information.* Fraction of sample remaining = remaining ppm of sample/initial ppm of sample * Age of sample = half-life value of isotope X number of half-lives elapsed Calibration Standard 1.Still others, however, are called incompatible because they are incompatible with the solid phases and are concentrated in the liquid.This incompatibility may be due to the ions being too large for the available ionic sites in the liquid, such as with rubidium (Rb), cesium (Cs), strontium (Sr), and barium (Ba). Picrite 2%), perlitic and/or vitrophyric fabric may form in the glass.