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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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TL;DR: In this paper, the age, petrogenesis and geodynamic implication of Xiaomiaogou granite porphyry dykes in the northern margin of the North China Craton were investigated using geochronology, geochemistry and Sr-Nd-Pb-Hf isotopic data.
Abstract: The age, petrogenesis and geodynamic implication of Xiaomiaogou granite porphyry dykes in the northern margin of the North China Craton were investigated using geochronology, geochemistry and Sr–Nd–Pb–Hf isotopic data. LA-MC-ICP-MS zircon U–Pb dating yielded the concordant 206Pb/238U weighted mean age of 350.4 ± 1.4 Ma for the dykes, suggesting they were the productions of the Early Carboniferous magmatism in the northern margin of the North China Craton. The granite porphyries display the pronounced A-type affinities: apart from higher zircon saturation temperature, they are high-K calc-alkaline and metaluminous, with high concentrations of K2O + Na2O varying from 7.93 to 8.55 wt.%, incompatible elements (e.g. Zr, Y, Nb and Ce), REEs and 10 000 Ga/Al ratios but less obvious LREE and HREE fractionation. With the lower initial 87Sr/86Sr ratios (0.7055 to 0.7070), negative values of eNd(t) (−7.1 to −4.9) and eHf(t) (−11.2 to −8.0) and old Nd (1505 to 1681 Ma) and Hf (1861 to 2061 Ma) model ages, all the rocks exhibit the similar geochemical compositions to the melts obtained in experimental studies by dehydration melting of meta-basalts, implying a lower continental crust origin. However, the high Mg# values (47.53 to 53.60) and subcontinental lithospheric mantle-like eNd(t), eHf(t) and Pb isotopic compositions ((206Pb/204Pb)i = 17.296–17.766, (207Pb/204Pb)i = 15.460–15.490 and (208Pb/204Pb)i = 37.097–37.568) indicate the involvement of melts from subcontinental lithospheric mantle. Combined with the special features of mafic microgranular enclaves occurring within the granite porphyries, mixing of the lower crust and subcontinental lithospheric mantle of the North China Craton is proposed for the genesis of granite porphyry dykes in this study. During the hybrid magma ascending, pronounced fractional crystallization and crustal assimilation may have also occurred. Based on geochemical criteria, the Xiaomiaogou granite porphyries can be classified into A1 group. Characterized by the compositional features of anorogenic granites, an intraplate setting is envisaged for the formation of Xiaomiaogou granite porphyry dykes. Such a tectonic environment may be related to the northward drift of the North China Craton during rifting away from East Gondwana. Copyright © 2016 John Wiley & Sons, Ltd.

4 citations

Hou Guiting1
01 Jan 1992
TL;DR: In this paper, a suite of chrysolites with the inject twin were found under a microscope firstly in the world, including various crystal stock with the fourling and the six-ling.
Abstract: Fifteen volcanic rock samples and one mantle xenolith sample which were collected from 8 volcanos and other places have been studied systematically, including petrogra-phic investigation, K-Ar dating, major and trace element and REE analysis as well as O, Sr and Nd isotope determination. The chrysolites with the inject twin are found under a microscope firstly in the world, including various crystal stock with the fourling and the six-ling. The chemical compositions show that it is a suite of magma wth a characterized SiO2-unsaturated, high aboundent of K and Mg and poor Ca as well as by much rich incompatible elements, REE (ΣREE=321-1002 ppm, (La/Lu)a= 42.5-76.4) and mantle compatible element also. The values of δ18O (5.8-8.7%0) are a little higher than that of the primary mantle while the isotope compositions of Sr and Nd fell in quadrant Ⅳ along the mantle array extension and closed to the origin of the coordinates on Sr-Nd diogram, it appeared as a primary mantle. K-Ar apparent age of volcanic rocks range from 0.03Ma to 2.98Ma, majority of them belong to Late-Pleistocene. An apparent age of the xenolith is about 70Ma while the oldest basalt is from 93.3Ma to 95.5Ma. The trend analysis suggest that there is a still posibility of eruption. The comparative experiment of dating between the conventional sample and after pick out of olivine sample implied that the dated ages of the Late-Cenozoic olivine-basalts distributed in northeast and east China may be older than the real values.

4 citations

Journal ArticleDOI
01 Nov 2019-Lithos
TL;DR: In this article, a series of dunites and pyroxenites from the Piton de la Fournaise (La Reunion Island, Indian Ocean) were studied and the effect of trapped liquids on the concentrations of incompatible elements in these cumulates was discussed.

4 citations

Journal ArticleDOI
TL;DR: In this article, fragments of P-bearing olivine have been studied in lunar highland, mare, and mingled meteorites and in “Apollo-14, “Luna-16, -20, -24” lunar samples.
Abstract: —Fragments of P-bearing olivine have been studied in lunar highland, mare, and mingled meteorites and in “Apollo-14”, “Luna-16, -20, -24” lunar samples. The olivines contain up to 0.5 wt % P2O5 and have variable MG# numbers. They are associated with anorthite, pyroxene, and accessory spinel-group minerals, Ti and Zr oxides, phosphates, troilite, and Fe–Ni metal. Three possible sources of P-bearing olivine were found in the lunar material: 1) highland anorthositic–noritic–troctolitic rocks enriched in incompatible elements and interpreted to be related to high-Mg suite rocks: 2) late-stage products of mare basalts crystallization; and 3) unusual olivine–orthopyroxene intergrowths of meteoritic or lunar origin. Enrichment in incompatible elements may result from both crystallization processes (source 2) and KREEP assimilation (sources 1 and 3). However, superimposed metasomatic processes can lead to some addition of phosphorus and other elements. The rarity of P-bearing olivines points either to the low abundance or local distribution of their sources in the lunar crust. Association with mare basalts specifies the highland–mare boundary. The presence of evolved rocks in the studied breccias suggests a possible connection of some sources with recently discovered granitic domes in Procellarum Ocean. This means the P-bearing sources are mainly localized on the nearside of the Moon.

4 citations


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