2021/2/16 Both experimental and theoretical studies have shown that magmas derived from high-pressure melting of recycled oceanic crust will react with the
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2022/3/8 To develop this point further, we also compare the microstructure of a Merensky Reef chromitite seam that occurs on vertical to overhanging sidewalls of
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2016/11/1 The metamorphic condition and pressure-temperature trajectory were estimated based on the petrological and petrofabric characteristics of the peridotites and
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2014/2/15 This implies that each chromitite body integrates melts formed by partial melting of very large volumes of mantle peridotite (up to ~ 30 × 10 3 m 3 for the 5 × 0.3
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2024/5/14 Thermodynamic modelling results reveal a wedge-shaped domain in pressure-temperature space in the subcratonic mantle within which Cr-bearing
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2017/4/1 The solubility of CaO and SiO 2 in magnesiochromite and its high-pressure polymorphs provides direct experimental constraints on the depth of metamorphism of
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The Hongshishan chromitite deposits are situated to the north of the Beishan orogenic collage, in the southern part of the Central Asian Orogenic Belt. ... The calculated
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Harzburgitic peridotites brought up to shallow mantle depths beneath forearc spreading centers first undergo decompression melting, followed by flux melting, producing
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2023/8/13 The inferred parental melt composition for massive chromitite falls in the field of boninite in an arc setting, whereas the disseminated chromite in peridotites are in the field of a MORB setting. ...
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Harzburgitic peridotites brought up to shallow mantle depths beneath forearc spreading centers first undergo decompression melting, followed by flux melting, producing magmas with forearc basalt, arc tholeiitic, and boninitic chemical affinities (Fig. 1; Dilek et al., 2008; Dilek and Furnes, 2009, 2014; Saccani et al., 2018) and causing the ...
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2016/2/17 The chromitite is economically important as a source of chromium and is also important for understanding the nature of the ancient upper mantle, young oceanic mantle, processes of melting and melt
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2016/11/1 Igneous textures in podiform chromitites, especially those indicating a crystal accumulation origin, were recognized in the 1960s (e.g., Thayer, 1964, Thayer, 1969), but the process of magmatic formation of podiform chromitites was not recognized until later.One of the most important observations related to podiform chromitite genesis
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2021/8/15 Most of the podiform chromite bodies at Zunhua are small, between 0.5 and 2 m thick, 1–2 m long, and extend up to 30 m in depth (Fig. 1 c-f).Some however are larger, exceeding 100 m in length, and have been extensively mined (Kusky et al., 2007).Most of the larger bodies form irregular lenses of dunite including chromite in pod
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2020/10/13 Fractionated chondrite-normalized PGE patterns of chromitites and associated peridotites and data scatter in the Pd/Ir versus Pt/Pt* space indicate chromitite formation by partial melting of the ...
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High-pressure highly reduced nitrides and oxides from chromitite of a Tibetan ophiolite ... Spengler D, et al. (2006) Deep orogen and hot melting of an Archaean orogenic peridotite massif in Norway. Nature 440:913–917. 6. Liu L, Zhang J, Green HW, Jin ZM, Bozhilov KN (2007) Evidence of former stishovite in metamorphosed sediments, implying ...
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2021/8/1 Compared to major elements, trace elements are even more sensitive for identifying the formation conditions of chromites including pressure, temperature, oxygen fugacity, degree of partial melting, and fractional crystallization (Dare et al., 2009; González-Jiménez et al., 2014).
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2017/4/1 Partial-melting experiments show that chromite cannot be formed through direct crystallization in the MTZ. Therefore, we suggest that the Tibetan chromitites formed under shallow conditions, were then subducted, and were metamorphosed near the top of MTZ. ... “Subduction-recycling” model: low-pressure chromitite was subducted to the
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2021/1/2 Arrow on the drill core points to selvage of nearly pure plagioclase adjacent to the chromitite seam. The chromitite seam is composed of chromite poikilitically enclosed in orthopyroxene (as seen in the crossed-polarizers detail view of Slide 4); white areas in the chromitite seam are not plagioclase but plucked mineral grains.
获取价格2006/11/29 The only data on Cr solubility at chromite saturation as a function of pressure are from the five experiments of Roeder Reynolds , which suggest that Cr solubility may actually increase rather than decrease with pressure. Finally, if the UG2 chromitite formed by simply closed-system crystallization of chromite in response to
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Chromite is a crystalline mineral composed primarily of iron(II) oxide and chromium(III) oxide compounds. It can be represented by the chemical formula of FeCr 2 O 4.It is an oxide mineral belonging to the spinel group.The element magnesium can substitute for iron in variable amounts as it forms a solid solution with magnesiochromite (MgCr 2 O 4). [6] A
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Ice cubes put in water will start to melt when they reach their melting point of 0 °C The melting point (or, rarely, liquefaction point) of a substance is the temperature at which it changes state from solid to liquid.At the melting point the solid and liquid phase exist in equilibrium.The melting point of a substance depends on pressure and is usually
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2021/2/16 high-pressure mineral inclusions, such as microdiamonds, metal alloys, Mn silicates and coesites, in podiform chromitites and other ophiolitic mantle rocks offer evidence of deep and reduced ...
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2018/11/1 The podiform chromitites in the Tibetan ophiolites have been thought to have experienced metamorphism corresponding to depths at the top of the mantle transition zone (MTZ). However, little is known about the phase relations of natural podiform chromitite in the MTZ, as well as the implications for processes related to formation of
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Chromite is a crystalline mineral composed primarily of iron(II) oxide and chromium(III) oxide compounds. It can be represented by the chemical formula of FeCr 2 O 4.It is an oxide mineral belonging to the spinel
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Ice cubes put in water will start to melt when they reach their melting point of 0 °C The melting point (or, rarely, liquefaction point) of a substance is the temperature at which it changes state from solid to liquid.At the
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2021/2/16 high-pressure mineral inclusions, such as microdiamonds, metal alloys, Mn silicates and coesites, in podiform chromitites and other ophiolitic mantle rocks offer evidence of deep and reduced ...
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2018/11/1 The podiform chromitites in the Tibetan ophiolites have been thought to have experienced metamorphism corresponding to depths at the top of the mantle transition zone (MTZ). However, little is known about the phase relations of natural podiform chromitite in the MTZ, as well as the implications for processes related to formation of
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2009/11/17 Until recently, the deepest rock samples recovered from Earth's interior were xenoliths carried to the surface in explosive eruptions of kimberlite and related rocks, with maximum depth of ≈300 km ().However, the advent of microstructural analysis of rocks from continental collision zones has established exhumation from still greater depths
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2023/4/23 Chromium is an essential element in many industrial processes, including stainless steel production, alloy manufacturing, and electroplating. It is also used in the production of refractory materials, pigments, and chemicals. Chromium’s ability to resist corrosion and its high melting point make it a valuable element in numerous applications.
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2020/8/14 We have used this simple model to predict such properties as freezing points, melting points, vapor pressure, and osmotic pressure. If this model were perfectly correct, we would expect the freezing point depression of a 0.10 m solution of sodium chloride, with 2 mol of ions per mole of \(\ce{NaCl}\) in solution, to be exactly twice that of
获取价格2014/2/15 This implies that each chromitite body integrates melts formed by partial melting of very large volumes of mantle peridotite (up to ~ 30 × 10 3 m 3 for the 5 × 0.3 m high-Cr chromitite of the Ojén massif; González-Jiménez et al., 2013a). These calculations suggest that the formation of a chromitite body requires a continual flow and ...
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Chromitite with bronzite phenocrysts from Stillwater Igneous Complex. Chromitite is an igneous cumulate rock composed mostly of the mineral chromite.It is found in layered intrusions such as the Bushveld Igneous Complex in South Africa, the Stillwater igneous complex in Montana and the Ring of Fire discovery in Ontario.. Chromitite typically
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2019/9/1 The atomic weight of the most abundant (83.789%) chromium isotope is 51.996. A total of 26 isotopes of chromium from 42 Cr to 67 Cr are known. Among them, there are three stable isotopes: 52 Cr, 53 Cr, and 54 Cr. 53 Cr is the product of 53 Mn radiogenic decay (a half-life is 3.74 m.y.). In addition, there are 19 radioisotopes with 50
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2021/2/17 High-degree melting is easier to achieve at higher pressure, at 1 GPa 40% melting is achieved 250–300 °C above the solidus, but this drops to just 90–100 °C above the solidus at 4 GPa 7,8.
获取价格2021/8/1 The total PGE abundances in these samples range from 63 to 172 ppb and have an average concentration of 100 ppb. The chondrite-normalized PGE patterns of the chromitites show a negative slope pattern which is enriched in high-melting-point IPGE (Ir-group, including Ir, Os, Ru) and depleted in PPGE (Pt-group, including Pd, Pt, Rh) (Fig. 3).
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2022/12/5 This contribution provides an overview of platinum group elements (PGE) distribution and mineralogy in ophiolitic chromitites, which are unusually enriched in the low melting-point Rh, Pt and Pd (PPGE) compared with most chromite deposits associated with ophiolites, which are dominated by the refractory Os, Ir and Ru (IPGE). The PPGE-rich
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Fig. 3. EELS spectra acquired from cBN. (A) Shown is the boron K-edge between 189 and 197 eV. (B) Shown is the nitrogen K-edge situated between 400 and 405 eV. The spectra of A and B were collected from the spot within the cBN in the boxed area of Fig. 2A, confirming the presence of BN. (C) Shown is the EELS spectrum of TiN measured in the boxed area
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