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- Un diagramme QFL ou triangle QFL est un type de diagramme ternaire qui permet de visualiser la composition modale des roches siliciclastiques, obtenue par exemple par la (en). Les abréviations utilisées sont les suivantes :
* Q - quartz ;
* F - feldspath ;
* L - fragments lithiques. En général, l'élément le plus controversé concerne les grains de chert, généralement classés comme fragments lithiques mais souvent plus pertinents dans le pôle Q. (fr)
- A 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. The abbreviations used are as follows:
* Q - quartz
* F - feldspar
* L - lithic fragments 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. When this happens, the pole is renamed 'Qt' instead of Q. The importance of a QFL triangle is mainly demonstrated in tectonic exercises. 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.
* Craton sands are clustered near the Q pole. As sandstones, these are known as quartz arenites.
* Transitional continental sands are along the QF line. As sandstones, these are known as arkoses.
* Basement uplift sands are near the F pole. This includes "thick-skinned tectonics." As sandstones, these are known as arkoses.
* Recycled orogen sands plot near the Q pole, but with significant F and L components. This includes "thin-skinned tectonics" common in subduction back-arc thrusting. As sandstones, these are known as lithic sandstones.
* Arc sands plot along the F and L line, with sometimes significant Q components. Clustering near the F pole indicates a dissected arc, and clustering near the L pole indicates an undissected, or new arc. As sandstones, these are known as arkoses and/or lithic sandstones. (en)
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- Un diagramme QFL ou triangle QFL est un type de diagramme ternaire qui permet de visualiser la composition modale des roches siliciclastiques, obtenue par exemple par la (en). Les abréviations utilisées sont les suivantes :
* Q - quartz ;
* F - feldspath ;
* L - fragments lithiques. En général, l'élément le plus controversé concerne les grains de chert, généralement classés comme fragments lithiques mais souvent plus pertinents dans le pôle Q. (fr)
- A 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. The abbreviations used are as follows:
* Q - quartz
* F - feldspar
* L - lithic fragments 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. When this happens, the pole is renamed 'Qt' instead of Q. (en)
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- Diagramme QFL (fr)
- QFL diagram (en)
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