Overview

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Gazzi-Dickinson method is a point-counting technique used in geology to statistically measure the components of a sedimentary rock, chiefly sandstone. The main focus (and most controversial) part of the technique is counting all sand-sized components as separate grains, regardless of what they are connected to. Gazzi-Dickinson point counting is used in the creation of ternary diagrams, such as QFL diagrams. To perform a point count using the Gazzi-Dickinson method, you need a randomly selected thin section from a sedimentary rock and a slide advance mechanism that will randomly select points on the slide with a petrographic microscope. A minimum of 300 representative points, and preferably 500 points, should be used to perform the count. On each randomly selected point that lands on a sand grain, the operator needs to decided the make up of the area chosen, whether it is a mineral grain that is sand sized (larger than 62.5 micrometres) or a finer-grained fragment of another rock type, called a lithic fragment ([.g. a sand-sized piece of shale). These are then converted to percentages and used for compositional comparisons in provenance studies.

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