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Incompatible element

About: Incompatible element is a research topic. Over the lifetime, 2420 publications have been published within this topic receiving 154052 citations.


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Journal ArticleDOI
TL;DR: In this paper, the authors use weighted bootstrap resampling to minimize sampling bias over the heterogeneous rock record and obtain maximally representative average basaltic compositions through time.

101 citations

Journal ArticleDOI
TL;DR: In this paper, the major and trace element compositions of the veins are in agreement with experimental evidence indicating that the composition of solutes in such fluids is dominated by SiO2 and Al2O3, and they confirm previous suggestions that fluids derived from subducted basalt may have low abundances of high field strength elements, rare earth elements and Y.

100 citations

Journal ArticleDOI
TL;DR: In this paper, the major and trace element abundances of 18 diogenites, and O-isotopes for 3 of them, were reported, and it was shown that the FeO/MgO ratios of diogenite parental melts range from about 1.4 to 3.5 and therefore largely overlap the values obtained for non-cumulate eucrites.
Abstract: We report on the major and trace element abundances of 18 diogenites, and O-isotopes for 3 of them. Our analyses extend significantly the diogenite compositional range, both in respect of Mg-rich (e.g., Meteorite Hills [MET] 00425, MgO = 31.5 wt%) and Mg-poor varieties (e.g., Dhofar 700, MgO = 23 wt%). The wide ranges of siderophile and chalcophile element abundances are well explained by the presence of inhomogeneously distributed sulfide or metal grains within the analyzed chips. The behavior of incompatible elements in diogenites is more complex, as exemplified by the diversity of their REE patterns. Apart from a few diogenite samples that contain minute amounts of phosphate, and whose incompatible element abundances are unlike the orthopyroxene ones, the range of incompatible element abundances, and particularly the range of Dy/Yb ratios in diogenites is best explained by the diversity of their parental melts. We estimate that the FeO/MgO ratios of the diogenite parental melts range from about 1.4 to 3.5 and therefore largely overlap the values obtained for non-cumulate eucrites. Our results rule out the often accepted view that all the diogenites formed from parental melts more primitive than eucrites during the crystallization of a magma ocean. Instead, they point to a more complex history, and suggest that diogenites were derived from liquids produced by the remelting of cumulates formed from the magma ocean.

100 citations

Journal ArticleDOI
TL;DR: In particular, the nearly constant Ce/Yb ratio of the minettes combined with the decrease in Cr, Ni, and Sc abundances from mafic to felsic minettes is inconsistent with a model of varying amounts of partial melting as the process to explain minette compositions as discussed by the authors.
Abstract: Trace element evidence indicates that at the Buell Park diatreme, Navajo volcanic field, the felsic minette can be best explained by crystal fractionation from a potassic magma similar in composition to the mafic minettes. Compatible trace element (Cr, Ni, Sc) abundances decrease while concentrations of most incompatible elements (Ce, Yb, Rb, Ba, Sr) remain constant or increase from mafic to felsic minette. In particular, the nearly constant Ce/Yb ratio of the minettes combined with the decrease in Cr, Ni, and Sc abundances from mafic to felsic minette is inconsistent with a model of varying amounts of partial melting as the process to explain minette compositions. The uniformity of rare earth element (REE) abundances in all the minettes requires that an accessory mineral, apatite, dominated the geochemistry of the REE during fractionation. A decrease in P2O5 from mafic to felsic minette and the presence of apatite in cognate inclusions are also consistent with apatite fractionation. Higher initial87Sr/86Sr ratios in the felsic minettes relative to the proposed parental mafic minettes, however, is inconsistent with a simple fractionation model. Also, a separated phlogopite has a higher initial87Sr/86Sr ratio than host minette. These anomalous isotopic features probably reflect interaction of minette magma with crust. The associated ultramafic breccia at Buell Park is one of the Navajo kimberlites, but REE concentrations of the matrix do not support the kimberlite classification. Although the matrix of the breccia is enriched in the light REE relative to chondrites, and has high La, Rb, Ba, and Sr concentrations relative to peridotites, the concentrations of these elements are significantly lower than in South African kimberlites. A high initial87Sr/86Sr ratio combined with petrographic evidence of ubiquitous crustal xenoliths in the Navajo kimberlites suggests that the relatively high incompatible element concentrations are due to a crustal component. Apparently, Navajo kimberlites are most likely a mixture of comminuted mantle wall rock and crustal material; there is no evidence for an incompatible element-rich magma which is characteristic of South African kimberlites. If the mafic minettes are primary magmas derived from a garnet peridotite source with chondritic REE abundances, then REE geochemistry requires very small (less than 1%) degrees of melting to explain the minettes. Alternatively, the minettes could have formed by a larger degree of melting of a metasomatized, relatively light REE-enriched garnet peridotite. The important role of phlogopite and apatite in the differentiation of the minettes supports this latter hypothesis.

100 citations

Journal ArticleDOI
01 Jan 1995-Lithos
TL;DR: Meimechites are highly magnesian alkaline lavas from the Meimecha-Kotuj region of northern Siberia as mentioned in this paper, which contain abundant large phenocrysts of olivine and smaller grains of chromite in a matrix of smaller olivines, titanian clinopyroxene, ilmenite, altered glass, and biotite.

100 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20237
202216
202157
202056
201960
201851