As sandstones, these are known as arkoses and/or lithic sandstones. Clustering near the F pole indicates a dissected arc, and clustering near the L pole indicates an undissected, or new arc. Arc sands plot along the F and L line, with sometimes significant Q components.As sandstones, these are known as lithic sandstones. This includes "thin-skinned tectonics" common in subduction back-arc thrusting. Recycled orogen sands plot near the Q pole, but with significant F and L components.This includes "thick-skinned tectonics." As sandstones, these are known as arkoses. Basement uplift sands are near the F pole.As sandstones, these are known as arkoses. Transitional continental sands are along the QF line.As sandstones, these are known as quartz arenites. Craton sands are clustered near the Q pole.As first demonstrated in the 1979 paper by Bill Dickinson and Chris Suczek, the composition and provenance of a sandstone is directly related to its tectonic environment of formation. The importance of a QFL triangle is mainly demonstrated in tectonic exercises. When this happens, the pole is renamed 'Qt' instead of Q. In general, the most contentious item counted is chert, which is usually counted as a lithic fragment, but is sometimes better suited in the Q pole. QFL triangle showing schematic plots of common sand compositionsĪ QFL diagram or QFL triangle is a type of ternary diagram that shows compositional data from sandstones and modern sands, point counted using the Gazzi-Dickinson method. One of the most familiar examples of a triangular plot in the Earth sciences illustrates the classification of feldspar.
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