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Electron microprobe analyses of major- and minor-element oxide components for two glassed samples of natural KLB-1 peridotite are presented. One glass was made with the aid of a phosphate flux, and the second glass was made by laser melting of aerodynamically levitated spheroids resulting in homogeneous silicate glass beads.
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The Horoman peridotite complex in Japan (Fig. 1), one of the Alpine-type peridotite massifs, is characterized by wide exposure and extremely limited serpentinization and, therefore, may provide valuable information regarding the tectonic movement of the uppermost mantle, such as the uplift and/or emplacement of the Alpine-type peridotite massif.
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The peridotite of the Hayachine ultramafic complex has not been well studied with respect to its rheological properties; ... The major minerals in the peridotites are olivine, orthopyroxene, clinopyroxene, spinel, amphibole, and serpentinite. Basitized orthopyroxene pseudomorphs were common in the samples.
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The main minerals of peridotite xenoliths (e.g., olivine, clinopyroxene, orthopyroxene and garnet) are known as the "nominally anhydrous minerals" (NAMs), which do not contain hydrogen based on ideal chemical formula but sometimes exist in the crystal lattice as point defects. Although the absolute value of water contents is low, they could ...
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Major and trace elements mineral data. The major element compositions of silicate ... D. A. Lithium elemental and isotopic disequilibrium in minerals from peridotite xenoliths from far-east Russia ...
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Which mineral class makes up most igneous rocks? Silicates. Which of the following minerals is not a ferromagnesian mineral? Potassium Feldspar. Peridotite is the main constituent of which part of the Earth? Upper mantle. Which two minerals define a felsic composition? Quartz and Potassium Feldspar. About us.
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Study with Quizlet and memorize flashcards containing terms like What is a peridotite? What minerals is it composed of?, If the geotherm is normally well below the beginning of melting temperature of anhydrous mantle peridotite, what three mechanisms cause melting of this peridotite?, Where do each of these mechanisms occur in terms of the plate tectonic …
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Excellent exposure and clear field relationships of peridotite, serpentinite and their weathering products at the Feragen Ultramafic Body (FUB), south eastern Norway, allow for detailed sampling ...
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Sometimes, peridotite rocks from the mantle get caught up in rising masses of magma. When erupted from volcanoes at the surface, the lava flows will have mantle peridotite xenoliths. There are seven principal varieties of peridotite, based on different percentages of the three main minerals: olivine, clinopyroxene, and orthopyroxene.
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Peridotites usually contain olivine as their primary mineral, frequently with other mafic minerals such as pyroxenes and amphiboles. Their silica content is low compared to other igneous …
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Their essential minerals are magnesium-rich olivine and pyroxenes. However, they also have minor amounts of mica, amphibole, and other minerals. The name peridotite comes …
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Peridotite consists of a dense iron and magnesia mineral called olivine, as well as pyroxenes and a small amount of feldspar. It is a pistachio-green color when fresh, but weathering creates iron oxides that turn it a medium brown. The iron and magnesia-rich rock is the most common host for naturally occurring diamonds.
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Ultramafic-- Peridotite--coarsely crystalline, contains more magnesium and iron-rich minerals especially green olivine, Upper mantle--peridotite. and more. Study with Quizlet and memorize flashcards containing terms like texture of a rock--refers to the sizes, shapes and arrangements of different components.
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Using this technique, we estimated continuous downhole-scale major mineral and element fractions of listvenite in Hole BT1B drilled by International Continental Scientific Drilling Project (ICDP) ... (completely carbonated former peridotite) is the main lithology in Hole BT1B and is also found in other ophiolite bodies (Hansen et al., 2005).
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Peridotite is the main constituent of which part of the Earth? A) Crust B) Magma chambers C) Rift zones D) Upper mantle. D. ... The _____ mineral on the Bowen's Reaction Series will be the last to melt if an igneous rock is heated, while _____ would be the first. A) Quartz, ...
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Olivine (Mg 2 SiO 4) reacts with CO 2-bearing aqueous fluids almost as fast as wollastonite (Palandri and Kharaka, 2004; National Academies of Sciences Engineering Medicine, 2019).Additionally, as the major mineral of …
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The main minerals of peridotite xenoliths (e.g., olivine, clinopyroxene, orthopyroxene and garnet) are known as the "nominally anhydrous minerals" (NAMs), which do not contain hydrogen based on ideal chemical formula but sometimes exist in the crystal lattice as point defects. Although the absolute value of water contents is low, they could ...
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What is Peridotite? Peridotite is a generic name used for coarse-grained, dark-colored, ultramafic igneous rocks. Peridotites usually contain olivine as their primary mineral, frequently with other mafic minerals such as pyroxenes and amphiboles. Their silica content is low compared to other igneous rocks, and they contain very little quartz and feldspar.
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Calcite is commonly found as an accessory mineral in these rocks (Fig. 6 a-n). It can be found in the matrix, generated among the main minerals, surrounding clinopyroxene and leucite grains without a defined shape (Fig. 6 i, j). It may have formed during the late stages of magma crystallization or by reaction with CO 2-rich fluids.
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Peridotite, a coarse-grained, dark-coloured, heavy, intrusive igneous rock that contains at least 10 percent olivine, other iron- and magnesia-rich minerals (generally pyroxenes), and not more than 10 percent feldspar.
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There are seven principal varieties of peridotite, based on different percentages of the three main minerals: olivine, clinopyroxene, and orthopyroxene. These seven rocks are dunite, pyroxenite ( formerly websterite), clinopyroxenite, …
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Minor minerals and mineral groups in peridotite include plagioclase, spinel (commonly the mineral chromite), garnet (especially the mineral pyrope), amphibole, and phlogopite.
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Peridotite is a plutonic rock, it is mostly composed of visible mineral grains. Other notable minerals that are often present are chromite, garnet, and plagioclase. It is an ultramafic rock …
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The Pali peridotite has lower H 2 O contents in its minerals compared to those of SLC with 236 ppm in clinopyroxene, 70 ppm in orthopyroxene, and up to 3 ppm in olivine. Using the modal proportions of minerals, the bulk-rock water contents were calculated to range from 45 to 97 ppm H 2 O.
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Download Table | Major hydrous minerals in the peridotite mantle from publication: Water transport into the deep mantle and formation of a hydrous transition zone | The phase relations in the ...
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peridotite, a coarse-grained, dark-coloured, heavy, intrusive igneous rock that contains at least 10 percent olivine, other iron- and magnesia-rich minerals (generally pyroxenes), and not more than 10 percent feldspar.It occurs in four main geologic environments: (1) interlayered with iron-, lime-, and magnesia-rich rocks in the lower parts of tabular-layered igneous complexes or masses; (2 ...
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Most of the minerals in the 91-Mile peridotite are interpreted to be primary igneous minerals, including olivine, diopside, orthopyroxene, amphibole (pargasite, edenite, ... Based on inclusion relationships, the crystallization order of major minerals was olivine, diopside, orthopyroxene, with minor primary amphibole, followed by phlogopite ...
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A suite of peridotite xenoliths were collected from lahar flow deposits located close to the summit of Mt. Pinatubo. Spinel harzburgite is the most dominant lithology among dunites, pyroxenites and websterites. A rare spinel lherzolite xenolith (P12-7) is also present in this suite. The spinel lherzolite has well-preserved protogranular texture with very minimal presence of …
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This review presents a compilation of abyssal peridotite geochemical data (modes, mineral major elements, and clinopyroxene trace elements) for >1200 samples from 53 localities on 6 major ridge ...
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Sometimes extrusive igneous rocks cool so quickly that no crystals form. This is especially likely to happen if lava meets water. The result is a rock composed of volcanic glass called obsidian.Examples of obsidian appeared in Figures 1.21 (Chapter 1) and Figure 4.5 (Chapter 4). In other cases, different minerals may grow to distinctly different sizes.
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Peridotite is a coarse-grained, dark-colored intrusive igneous rock, which consists of minerals such as pyroxene and olivine. It usually contains olivine as the primary mineral in addition to other mafic minerals, such as amphiboles and …
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C. the extrusive magma cools quickly so the mineral grains do not have time to grow. 1 / 60. 1 / 60. Flashcards; ... Visible quartz and potassium feldspar grains are the main constituents in a _____. ... B. Pumice _____ is composed mainly of ferromagnesian minerals. D. Peridotite. Which of the following minerals crystallize early in Bowen's ...
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The Zhaheba ophiolite is an ocean relic of the Zhaheba-Aermantai oceanic slab, a branch of the early Paleozoic Paleo-Asian Ocean. The peridotites consist mainly of harzburgite, lherzolite and minor dunite, chromitite. This study describes the whole-rock geochemistry and mineral chemistry of the Zhaheba peridotite and chromitite for the purpose of constraining their …
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As a major component of the Earth's mantle, ultramafic rock equilibrates under dry, high-temperature conditions and is thus metastable at the Earth's surface and in the presence of aqueous fluid. ... Primary olivine contains on average ~2880 ± 410 ppm Ni and represents the dominant Ni host mineral in peridotite 43. Analysis of ...
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New all-rock major oxide, trace, and REE data and main mineral oxide data of mantle peridotites, which constitute the lowest level of the ophiolite sequence, are presented. In the light of these data, it was aimed to evaluate the partial melting and metasomatism by examining the rock formation of the mantle peridotites of the ophiolitic rocks ...
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The dashed line is the reconstructed whole rock Cl content of BM peridotite calculated from mineral proportions and the in-situ Cl content of the constituent minerals (Urann et al., 2017). MgO and Al 2 O 3 data for BM and BD peridotites and pyroxenites are from ( Wang and Becker, 2015 ; Wang et al., 2013 ).
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