By Paul C. Ragland
This booklet is meant as a supplementary textual content for petrology classes in any respect degrees. it truly is keen on the way during which numerous varieties of chemical substances and thermochemical facts are interpreted for igneous rocks and minerals. complicated phenomena are defined in down-to-earth and easy-to-grasp phrases, and method is under pressure. The booklet is sensible in that it offers with challenge fixing, together with the pc programming recommendations to unravel those difficulties, in addition to interpretation of section and version diagrams.
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This e-book is meant as a supplementary textual content for petrology classes in any respect degrees. it truly is interested by the way during which quite a few varieties of chemical substances and thermochemical info are interpreted for igneous rocks and minerals. complicated phenomena are defined in down-to-earth and easy-to-grasp phrases, and method is under pressure.
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Extra resources for Basic Analytical Petrology
The intensity of a linear correlation can be measured by a linear correlation coefficient, also known as the Pearson or product moment correlation coefficient. In correlation, as opposed to some types of _regression, no assumptions have to be made about which variable is independent and which is dependent. 4 discusses regression as well as independent and dependent variables. Before defining the linear correlation coefficient, however, we must introduce covariance. Covariance is to bivariate statistics as variance is to univariate statistics.
8 Either EWs or gfws are obviously satisfactory in the above calculation because they are numerically identical. In general, however, working with EWs for similar conversions is safer. It is not necessary first to convert to weight percent atom and then mol proportion atom in any conversion from weight percent oxide to atomic percent. e I ts . :s &< i :II lt 'l'. li> l. ~ A partial analysis can be converted to a mol percent oxide ratio just as easily. An important ratio for delineating igneous rock suites is mol percent Al203 / (CaO + Na20 + K10) (AICNK).
Collective compositions of possible interfering ions) are matched as closely as possible in all rock standards and unknowns. For example, if mafic rocks are unknowns, use mafic rocks as standards. Another precaution is to be sure that rock standards and unknowns are opened by exactly the same procedure. The second complication concerns instrumental drift. During analysis sensitivity of the instrument changes with time. If one analyzes the same sample numerous times while analyzing the unknowns and standards, almost invariably the replicate absorbances for this sample changes.