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The Theraphosinae are a large subfamily of Mygalomorphae spiders in the family Theraphosidae found primarily in the Neotropical realm. Genera
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This is because most magma from which igneous rock solidifies is produced by partial melting of a mixture of different minerals. [4] At first the mixed melt slowly cools deep in the crust. The magma begins crystallizing, the highest melting point minerals closest to the overall composition first, in a process called fractional crystallization .
Petrologists routinely express the composition of a silicate magma in terms of the weight or molar mass fraction of the oxides of the major elements (other than oxygen) present in the magma. [19] Because many of the properties of a magma (such as its viscosity and temperature) are observed to correlate with silica content, silicate magmas are ...
Schematic diagrams showing the principles behind fractional crystallisation in a magma. While cooling, the magma evolves in composition because different minerals crystallize from the melt. 1: olivine crystallizes; 2: olivine and pyroxene crystallize; 3: pyroxene and plagioclase crystallize; 4: plagioclase crystallizes.
Tmesiphantes is a genus of Brazilian tarantulas in the subfamily Theraphosinae that was first described by Eugène Louis Simon in 1892. [ 1 ] [ 2 ] The genera Magulla and Melloleitaoina were brought into synonymy in 2019.
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carbon dioxide or water (each condition leading to a distinctive magma); reaction of melts with surrounding rock as they rise from their sources; Mantle sources of ultrapotassic magmas may contain subducted sediments, or the sources may have been enriched in potassium by melts or fluids partly derived from subducted sediments.