FACTOID # 146: About one-quarter of all nations drive on the left-hand-side of the road. Most of them are former British colonies.
 
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Encyclopedia > Incompatible element

Incompatible element is a term used in petrology and geochemistry. Petrology is a field of geology which focuses on the study of rocks and the conditions by which they form. ... The field of geochemistry involves study of the chemical composition of the Earth and other planets, chemical processes and reactions that govern the composition of rocks and soils, and the cycles of matter and energy that transport the Earths chemical components in time and space, and their interaction with...


During the fractional crystallization of magma, and magma generation by the partial melting of mantle, elements that have difficulty in entering cation sites of the minerals are concentrated in magma (liquid phase). An incompatible element is an element that is unsuitable in size to the cation sites of the minerals, and is defined by the partition coefficient between rock-forming minerals and magma being much smaller than 1. In chemistry, Fractional Crystallization is a method of refining substances based on differences in soluability. ... Magma is molten rock often located inside a magma chamber beneath the surface of the Earth. ... A Mantle is a piece of clothing, similar to a robe but open on the front side and often sleeveless. ... In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i. ... A cation is an ion with positive charge. ... Minerals are natural compounds formed through geological processes. ... LogP is a measure of differential solubility of a compound in two solvents. ... Magma is molten rock often located inside a magma chamber beneath the surface of the Earth. ...


There are two groups of elements that have difficulty entering the solid phase. One group includes elements having large ionic radius, such as potassium, rubidium, caesium, strontium, barium, rare earth elements, thorium, and uranium (called LILE, or large-ion lithophile elements), and the other group includes elements of large ionic valences such as zirconium, niobium, hafnium, and tantalum (called HFSE, or high field strength elements). Ionic radius is a concept for expressing the sizes of ions in ionic crystals. ... General Name, Symbol, Number potassium, K, 19 Chemical series alkali metals Group, Period, Block 1, 4, s Appearance silvery white Atomic mass 39. ... General Name, Symbol, Number rubidium, Rb, 37 Chemical series alkali metals Group, Period, Block 1, 5, s Appearance silvery white Atomic mass 85. ... General Name, Symbol, Number caesium, Cs, 55 Chemical series alkali metals Group, Period, Block 1, 6, s Appearance silvery gold Atomic mass 132. ... General Name, Symbol, Number strontium, Sr, 38 Chemical series alkaline earth metals Group, Period, Block 2, 5, s Appearance silvery white metallic Atomic mass 87. ... General Name, Symbol, Number barium, Ba, 56 Chemical series alkaline earth metals Group, Period, Block 2, 6, s Appearance silvery white Atomic mass 137. ... de;Metalle der Seltenen Erden Categories: Stub | Chemical element groups ... General Name, Symbol, Number thorium, Th, 90 Chemical series Actinides Group, Period, Block n/a, 7, f Appearance silvery white Atomic mass 232. ... General Name, Symbol, Number uranium, U, 92 Chemical series actinides Group, Period, Block n/a, 7, f Appearance silvery gray metallic; corrodes to a spalling black oxide coat in air Atomic mass 238. ... General Name, Symbol, Number zirconium, Zr, 40 Chemical series transition metals Group, Period, Block 4, 5, d Appearance silvery white Atomic mass 91. ... General Name, Symbol, Number niobium, Nb, 41 Chemical series transition metals Group, Period, Block 5, 5, d Appearance gray metallic Atomic mass 92. ... General Name, Symbol, Number hafnium, Hf, 72 Chemical series transition metals Group, Period, Block 4, 6, d Appearance gray steel Atomic mass 178. ... General Name, Symbol, Number tantalum, Ta, 73 Chemical series transition metals Group, Period, Block 5, 6, d Appearance gray blue Atomic mass 180. ...


  Results from FactBites:
 
MAGMA EVOLUTION AND GENESIS (1447 words)
Because of the high solubility of mobile elements (e.g., Rb, Ba, U, K, Sr, Pb) in hydrous fluids at mantle temperatures, these elements are transported from the slab to the overlying asthenospheric wedge, resulting in enrichment of the wedge (and the melts derived from the wedge) in these elements (e.g., Gill, 1981).
The extreme depletion in highly incompatible, immobile elements observed in some of the LREE-depleted basalts are primarily found in subduction environments and are believed to form by high degrees of melting in the presence of water and/or as a result of progressive depletion of the source (e.g., Stolper and Newman, 1994).
The mobile elements are, however, continually enriched in the wedge by new fluid fluxes.
Magmatic Differentiation (5554 words)
When considering the rocks in the mantle, trace elements can be divided into incompatible elements, those that do not easily fit into the crystal structure of minerals in the mantle, and compatible elements, those that do fit easily into the crystal structure of minerals in the mantle.
As melting proceeds the concentration of these incompatible elements will decrease because (1) there will be less of them to enter the melt, and (2) their concentrations will become more and more diluted as other elements enter the melt.
Because Rb is an incompatible element, it has been extracted from the mantle by magmas and added to the crust.
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