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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 the western High Atlas, major volcanic activity supplied andesitic and dacitic lava and pyroclastic flows interbedded with pelitic sandstones and limestones, very likely during the Pan-African orogeny.
Abstract: In the western High Atlas, major volcanic activity supplied andesitic and dacitic lava and pyroclastic flows interbedded with pelitic sandstones and limestones. All these formations were isoclinally folded and metamorphosed into the greenschist facies, very likely during the Pan-African orogeny. The lavas include: 1) a few back-arc basin basalts depleted in the most incompatible elements. 2) andesites weakly to moderately enriched in incompatible elements, and 3) dacites. This magmatism is assigned to a volcanic arc context, which we consider as being earlier than the continental intra-plate extensive context of the Cambrian magmatism.

5 citations

Book ChapterDOI
01 Jan 1996
TL;DR: In the field of petrogenesis and geochemistry, rare earth elements have been particularly important in evaluating the composition and history of magmatic source regions, the conditions of melting, the extent of melting and the modification of melt composition by assimilation or metasomatism as mentioned in this paper.
Abstract: Rare earth elements (REE) are an integral part of modern geochemical and petrological studies. The rare earths are widely used, either alone as a group or in combination with other trace elements, to study igneous rock systems and, to a lesser extent, sedimentary and metamorphic rocks. Most of the major advances have been in the field of igneous petrogenesis and geochemistry, where they have been particularly important in evaluating the composition and history of magmatic source regions, the conditions of melting, the extent of melting, the modification of melt composition by assimilation or metasomatism, and the magmatic differentiation processes of the resulting magmatic system.

5 citations

Book ChapterDOI
01 Jan 2019
TL;DR: In this paper, two different assemblages of metavolcanics (amphibolites) are identified: oceanic assemblage consisting of N-MORB, E-mORB and OIB and subduction derived assemblaging comprising oceanic and continental arc associations.
Abstract: In the Bundelkhand craton of the central Indian shield Mauranipur-Babina greenstone belt is exposed along the E-W trending Bundelkhand tectonic zone (BTZ). The supracrustal sequence of this belt consists of metavolcanic and metasedimentary rocks associated with the granitic gneiss. The metavolcanic rocks occur as small isolated outcrops and have undergone greenschist to amphibolite facies of metamorphism. Since this craton underwent a complex history of faulting, folding, and fabric development, the original stratigraphic relationships between different spatially associated units are unknown. On the basis of the geochemical characteristic of these metavolcanics (amphibolites), two different assemblages are identified (1) oceanic assemblage consisting N-MORB, E-MORB and OIB and (2) subduction derived assemblage comprising oceanic and continental arc associations. The N-MORB type amphibolites are characterized by depleted REE patterns with (La/Yb)n = 0.33–0.36, (La/Sm)n = 0.32–0.40, (Gd/Yb)n = 0.91–1.09, ∑ REE = 16.44–22.31 enrichment of Nb relative to Th, La and Ce. The E-MORB type amphibolites show flat REE patterns with (La/Yb)n = 1.06, (La/Sm)n = 0.68, (Gd/Yb)n = 1.43, ∑ REE = 48.70 and positive anomalies at Nb and Zr. The OIB type amphibolite show fractionated REE patterns with (La/Yb)n = 2.72–3.73; (Gd/Yb)n = 2.44–2.74 and (Sm/Yb)n = 2.91–3.28 and high total REE contents (∑ REE = 75.40–99.39 ppm). On PM normalized diagram they display progressive enrichment of incompatible elements. The amphibolites of the subduction derived assemblage show fractionated REE patterns with (La/Yb)N = 4.44–15.79, concave HREE patterns and positive as well as negative Eu anomalies. The elemental ratios of these amphibolites {(Nb/Th)pm = 0.06–0.23, (Nb/La)pm = 0.15–1.05, (Ti/Sm)pm = 0.09–1.14, (Zr/Nd)pm = 0.07–0.69 and (Zr/Sm)pm = 0.14–1.02} are similar to the basaltic rocks occurring in modern subduction related geodynamic settings. The presence of these N-MORB, E-MORB, OIB and IAB in Mauranipur-Babina greenstone belt of Bundelkhand craton suggests the existence of different plate tectonic settings in central part of the Indian shield during the Archaean. Incompatible trace element characteristics suggest the enrichment of Archaean MORB type mantle source by subduction derived components leading to the conversion of the Achaean depleted upper mantle to enriched sub-arc mantle wedge.

5 citations

Journal ArticleDOI
TL;DR: The Carboniferous volcanic rocks in western Hainan island consist of a series of oceanic tholeiite and rhyoporphyrite, showing bimodal nature as discussed by the authors.
Abstract: The Carboniferous volcanic rocks in western Hainan Island consist of a series of oceanic tholeiite and rhyoporphyrite, showing bimodal nature. Similar geochemical characters, in terms of abundances and relative ratios of incompatible elements and REE and the REE patterns, between the basalt and continental rift-associated tholeiite indicate the occurrence of Late Paleozoic rifting in the area. The basaltic magma, with a low degree of evolution, was originated from deep mantle, showing contamination by low crustal material. The rhyolite is thought to be formed from partial melting of the continental crust caused by higher thermal flow in a rift environment rather than from fractional crystallization of a basaltic magma.

5 citations

01 Jan 1991
TL;DR: The trace elements in the inclusions and their host rocks showed that the magma was origi-nated from the mantle which was enriched in incompatible elements by mantle metasomatism prior to the par-tial melting as discussed by the authors.
Abstract: Phlogopiie-and diopside-bearing dunite occurs as rounded inclusions in hornblende-diorite Thepetrofabrics, mineral composition and abundances of the trace elements in the dunite indicate that the inclu-sions were derived from the upper mantle and are the residues of high-degree partial melting of mantlepeirdotite The study of trace elements in the inclusions and their host rocks shows that the magma was origi-nated from the mantle which was enriched in incompatible elements by mantle metasomatism prior to the par-tial melting

5 citations


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