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pyroxenite ferrous content
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Origin of pyroxenites in the oceanic mantle and their …
Pyroxenites are diffuse in fertile mantle peridotites and considered an important component in the mantle source of oceanic basalts. They are rarely documented in abyssal and ophiolitic peridotites representing residual mantle after melt generation, and few studies defining their origin are to date available. We present a field-based …
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Pyroxenite xenoliths from the Rio Puerco volcanic field, …
Two of the garnet-bearing pyroxenite samples (CTON-6, CTON-77) record pressures of 16–18 kbar, whereas samples CTON-17 and CTON-81 record pressures of 11–14 kbar. The Brey and Köhler (1990) geobarometer is extremely sensitive to calculated ferric iron content in
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Oxidized iron in garnets from the mantle transition zone
The oxidation state of iron in Earth's mantle is well known to depths of approximately 200 km, but has not been characterized in samples from the lowermost upper mantle (200–410 km depth) or ...
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Ferrous/ferric (Fe2+/Fe3+) partitioning among silicates in metapelites
Data selection and extraction. Papers and theses containing measurements of Fe 2+ and Fe 3+ in minerals were discovered through a series of Google Scholar and ProQuest searches using combinations of the following key words: ferrous, ferric, Fe 3+, wet chemical, metapelitic, metasedimentary, and metamorphism.Some searches were …
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Pyroxenite causes fat plumes and stagnant slabs
Rudolph et al. [] analyzed the long-wavelength nonhydrostatic geoid, allowing the depths of possible viscosity jumps to vary, and found that the best fitting models require significant viscosity increase in the 800–1200 km depth range.They speculate that this results from either variation in the relative abundance of ferric versus …
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The role of pyroxenite in basalt genesis: Melt‐PX, a melting
Stable phase assemblages calculated with pMELTS [Ghiorso et al., 2002] for the Cr-free pyroxenite composition MIX1G as a function of temperature and pressure.The solidus and liquidus are labeled and shown as heavy red curves. The mass fraction of liquid is contoured in weight percent (dotted or dashed red lines; the 5% melt contour is shown …
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Pyroxenite
Pyroxenite is an ultramafic igneous rock consisting essentially of minerals of the pyroxene group, such as augite, diopside, hypersthene, bronzite or enstatite. Pyroxenites are classified into clinopyroxenites, orthopyroxenites, and the websterites which contain both types of pyroxenes (see diagram below). Closely allied to this group are the ...
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The carbonatite story once more and associated REE mineral …
1. Introduction. The carbonatite challenge is one of the most interesting in modern geology (Woolley and (Editor), 1987, Bell, 1989, Woolley and Kemp, 1989, Woolley, 2001, Woolley and Kjarsgaard, 2008, Berger et al., 2009, González-Álvarez et al., 2021, Vladykin and Pirajno, 2021).The economic REE viability of carbonatites is one of the …
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Pyroxenite melting at subduction zones
Based on the abundance of pyroxenites in the melting region of subduction zones as well as the lower solidi temperatures and higher melt productivities of these lithologies compared to peridotite (Lambart et al., 2013), preferential melting of pyroxenite may supply disproportionate volumes of magma to the arc budget, especially at thick …
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On the chemical markers of pyroxenite contributions in …
The relationship between the olivine modal abundance calculated by Ol (wt%) = 144.27ln((Fe + Mg + Ca + 2Na) / Si) and the bulk MgO content suggests that both peridotite and pyroxenite show large variations in the MgO content with a constant olivine content (Fig. 1 b). Our model suggests that if < 30 wt% MORB is mixed with DMM …
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Incipient carbonate melting drives metal and sulfur
Incipient melts may be locally generated in the mantle due to a substantial reduction in the solidus temperature associated with the presence of small amounts of volatile components such as H 2 O and CO 2 (20–26).The composition of incipient melts generated from partial melting of volatile-bearing peridotite (1, 12) is carbonate-rich as …
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Lithospheric hydrous pyroxenites control localisation and Ni …
The S content of pyroxenite mantle assemblages is not well constrained; however, if sulfides are absent from a pyroxenite mantle assemblage, the primary control on Cu will be exerted by K-richterite and minor rutile. To provide a comparison of the Ni content in melts from peridotite and hydrous pyroxenite, ...
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Buoyant hydrous mantle plume from the mantle transition …
The analytical results show that (1) the fraction of the pyroxenite component in the source mantle was 4–11%; (2) the degree of melting was 3–6%; (3) the water content in the source mantle was ...
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Pictures and Descriptions of Igneous Rock Types
Perlite is an extrusive rock that forms when a high-silica lava has a high water content. It is an important industrial material. This type of igneous rock forms when a body of rhyolite or obsidian, for one reason or another, has a relatively large amount of water. ... Pyroxenite is a plutonic rock that consists of dark minerals in the pyroxene ...
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Underplated melts control sulfide segregation at the
The assimilation of continental crustal material is a critical differentiation mechanism which drives sulfide segregation and sulfide-controlled metal storage, according to petrological and ...
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Pyroxenite | Mafic, Ultramafic & Igneous | Britannica
Pyroxenite, dark-coloured, intrusive igneous rock that consists chiefly of pyroxene. Pyroxenites are not abundant; they occur in discrete inclusions, in layered sills (tabular …
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Pyroxenite
Pyroxenite is a type of ultramafic igneous rock composed mainly of dark pyroxene minerals. Learn about its formation, composition, occurrence, and examples from various scientific …
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Pyroxenite-Based Ceramic Pigment | Glass and Ceramics
A composition of a ceramic pigment has been developed using pyroxenite, including pyroxene minerals — augite and enstatite—with forsterite, serpentine and coloring oxides of iron and chromium being present. The compositions of the crystalline phases in pigments were investigated by means of XPAand microanalysis as a function of the …
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Diverse origins of pyroxenite xenoliths from Yangyuan, North …
The North China Craton (NCC) has experienced widespread post-Mesozoic thermo-tectonic reactivation, which resulted in a dramatic transformation of the lithospheric mantle from an old, thick, cold, refractory Archean cratonic mantle into a young, thin, hot, fertile Phanerozoic lithospheric mantle (e.g., Griffin et al., 1998; Menzies et al., 1993; Xu, …
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Oxidized iron in garnets from the mantle transition zone
Analyses of these minerals from peridotite xenoliths and less abundant mantle pyroxenites using Möss spectroscopy indicate that the Fe 3+ content of …
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Implications for the seismic detection of pyroxenite in the …
Pyroxenite is denser than eclogite but also has higher bulk and shear moduli, which make it seismically faster. The impedance contrast across a possible pyroxenite …
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Water in Hawaiian garnet pyroxenites: Implications for water
Garnet pyroxenite xenoliths from Hawaii have 256–467 ppm bulk H 2 O.. These H 2 O concentrations are 2 to 4 times higher than the MORB source.. The pyroxenite H 2 O/Ce ratios (35–115) are lower than the MORB source.. The high H 2 O, low H 2 O/Ce suggests a link between pyroxenites and EM-type OIB.. We suggest a link …
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Peridotites: Dense, Coarse-Grained Ultramafic Intrusive …
Peridotites are dense, coarse-grained, dark-colored ultramafic plutonic rocks with at least 40% olivine by volume. Members are dunite, kimberlite, harzburgite, wehrlite and lherzolite.Others are hornblende and pyroxene-hornblende peridotites. These silica-poor (< 45 wt.% SiO2) ultrabasic rocks have at least 90 vol. % mafic minerals.Their …
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Markers of the pyroxenite contribution in the major …
The Na 2 O content of liquid increases until the disappearance of feldspar, then Na 2 O behaves as an incompatible element. Moreover, at P > 3 GPa, the Na 2 O content in melts does not change significantly due to the increase of the relative compatibility of Na 2 O in residual Cpx (e.g., Pertermann and Hirschmann, 2003, …
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Characterization of Chromiferrous Pyroxenite and Its …
The present investigation focuses on the characterization and utilization of the pyroxenite as a flux while producing high carbon ferrochrome in a submerged arc furnace. The current research also includes the furnace performance parameters such as average furnace load, average charge resistance, average power factor, specific …
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Pyroxenite–harzburgite sequences in the Dazhuqu ophiolite …
Pyroxenite veins are commonly observed in the mantle section of ophiolites, reflecting a variety of melts that percolate through the mantle, react, and finally crystallize in the lithosphere. To better understand the formation mechanism of the pyroxenite veins and associated peridotites, we conducted an integrated petrological …
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Partial melting experiments on a MORB‐like pyroxenite …
Comparison of the G2 bulk composition (open square) used in experiments with composition of MORB and of pyroxenites from peridotite massifs, xenoliths, and eclogites from the compilation of Hirschmann and Stolper.G2 pyroxenite is near the average of eclogite, having high total alkalis and low Mg# as well as average CaO and …
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Implications for the seismic detection of pyroxenite in the …
The modeled seismic impedance contrasts at the boundaries between peridotite and pyroxenite (red) and pyroxenite and eclogite (orange) are given in the figure. Modeling has been done for typical mantle assemblages expected at 350 km (median depth of origin of our majorite inclusions), but using elastic properties and …
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Thermal effects of pyroxenites on mantle melting below mid …
We show that a pyroxenite-bearing source entering the subridge melting region induces undercooling of the host peridotitic mantle, due to subtraction of latent …
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Carbon mineralization and abiotic methane synthesis within …
Carbon mineralization in mafic-ultramafic rocks is not only a natural process that can form significant carbon sinks in the lithosphere, but also a promising procedure for artificial CO 2 storage. In this study, we report unique records of in situ carbon mineralization within fluid inclusions in postcollisional pyroxenite from the Dabie orogen, …
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Depth-dependent peridotite-melt interaction and the origin of
Partial melts of hybrid peridotite-pyroxenite sources have higher NiO and SiO 2 and lower CaO and MgO than melts of pure peridotite, on this basis it was suggested that pyroxenite contributes ~30% ...
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The constant oxidation state of Earth's mantle since the …
The mantle constitutes the most significant volatile reservoir on Earth, and the release of volatiles (e.g. H, C, O, and S) through volcanic degassing governs the composition of the atmosphere 1,2
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Eclogites and garnet pyroxenites: Similarities and differences
However the intraplate garnet pyroxenite from Kakanui has lower Al than the bulk of continental eclogites and the Malaita garnet pyroxenite has a higher Mg content. Eclogites do not have the low Al and high Mg characteristics of some garnet pyroxenites, exemplified by the garnet pyroxenite from Bultfontein which has much lower Al than …
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Characterization of Chromiferrous Pyroxenite and Its …
Formation of magnesioferrite and high melting point slag with low FeO content in the fired pellets could be attributed to the improved performance of pyroxenite pellets. View Show abstract
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Pyroxenite | NOVA Mineralogy
A resource for Mineralogy students. Actinolite; Albite; Alkali Feldspar; Almandine; Amazonite; Amphibole; Andalusite; Andesine
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Thermal effects of pyroxenites on mantle melting below …
Pyroxenite—recycled, subducted material—beneath mid-ocean ridges cools the mantle, suppressing melt extraction and crust formation, according to geochemical analyses of samples taken from the ...
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