#petrology — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #petrology, aggregated by home.social.
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Interbedding (Petrology 💎)
In geology, interbedding occurs when beds of a particular lithology lie between or alternate with beds of a different lithology. For example, sedimentary rocks may be interbedded if there were sea level variations in their sedimentary depositional environment. Intercalation is a special case of interbedding where a layer is variably inserted into an already existing s...
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Lens (geology) (Petrology 💎)
In geology, a lens or lentil is a body of ore or rock that is thick in the middle and thin at the edges, resembling a convex lens in cross-section. To thin out in all directions is to "lens out", also known as "lensing". The adjectives "lenticular" and "lentiform" are used to describe lens-like formations. Lenticle is a synonym for lentil, but may also refer to a fragment of rock that...
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Point counting (geology) (Geology ⛰️)
In geology, point counting is a method to determine the proportion of an area that is covered by some objects of interest. In most cases the area is a thin section or a polished slab. The objects of interest vary between subdisciplines and can for example be quartz or feldspar grains in sedimentology, any type...
https://en.wikipedia.org/wiki/Point_counting_(geology)
#PointCounting #Geology #Petrology #Geostatistics #IgneousPetrology #GeologicalTechniques
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Andesite line (Volcanology 🌋)
The andesite line is the most significant regional geologic distinction in the Pacific Ocean basin. It separates the mafic basaltic volcanic rocks of the Central Pacific Basin from the partially submerged continental areas of more felsic andesitic volcanic rock on its margins. The andesite line parallels the subduction zone...
https://en.wikipedia.org/wiki/Andesite_line
#AndesiteLine #Petrology #Volcanology #PlateTectonics #IgneousPetrology #HistoryOfEarthScience
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Andesite line (Volcanology 🌋)
The andesite line is the most significant regional geologic distinction in the Pacific Ocean basin. It separates the mafic basaltic volcanic rocks of the Central Pacific Basin from the partially submerged continental areas of more felsic andesitic volcanic rock on its margins. The andesite line parallels the subduction zone...
https://en.wikipedia.org/wiki/Andesite_line
#AndesiteLine #Petrology #Volcanology #PlateTectonics #IgneousPetrology #HistoryOfEarthScience
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QAPF diagram (Petrology 💎)
A QAPF diagram is a doubled-triangle plot diagram used to classify intrusive igneous rocks based on their mineralogy. The acronym QAPF stands for "Quartz, Alkali feldspar, Plagioclase, Feldspathoid ", which are the four mineral groups used for classification in a QAPF diagram. The percentages of the Q, A, P and F groups are normalized, i.e., recalculated so that th...