Mineralogical and geochemical constraints on contribution …
As revealed by zircon Hf isotopes, F concentrations in amphibole and biotite and thermodynamic modeling of crystallization, the gabbronorites represent enriched lithospheric …
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Magnetite layer formation in the Bushveld Complex of …
If it formed either by a process of fractional crystallization as a loose pile of settled crystals 3,4 or as a loose arrangement of chains of magnetite crystals nucleated against …
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Magnetite geochemistry and iron isotope signature of …
Magnetite is a common accessory mineral and an indicator to magma evolution and sulfide fractional crystallization in magmatic Ni Cu sulfide deposits. The Kalatongke magmatic …
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Titanium isotopic compositions of bulk rocks and mineral …
δ 49 Ti of mineral separates and bulk rocks from the Kos volcano-plutonic system. Analyzed mineral phases: magnetite, olivine, biotite, plagioclase, quartz • A first δ 49 Ti bulk …
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Geochronology, geochemical and Sr–Nd–Hf-Pb isotopic
There is increasing evidence to show that high field strength elements (e.g., Nb, Ta, Zr, Hf, and Ti) could mobile to some extent in magmatic-hydrothermal fluids (Tanis et al., …
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Fractional Crystallization
Fractional crystallization is understood to be an important process for Earth's magmatic systems and appears to be important wherever molten magma cools slowly enough to allow minerals to …
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Magnetite layer formation in the Bushveld Complex of …
fractional crystallization of magnetite from a homogeneous body of melt containing 57 ppm Cr3,27, with f O2 between zero and one log unit below the quartz-fayalite-magnetite oxygen …
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Mineralogy and geochemistry of magnetite in the Zhdanov …
Binary plots of Cr versus Ti and V of the type 2 Cr-spinel from the Zhdanov deposit. The fractional crystallization trend was defined by Dare et al. (2012) according to magnetite …
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Fractional crystallization and the formation of thick Fe–Ti–V …
The Baima layered intrusion is located in the central part of the Emeishan Large Igneous Province (ELIP). The N–S striking intrusion is ~ 24 km long and ~ 2 km thick and dips …
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Decoupled high-Ti from low-Nb (Zr) of eclogites from the …
However, fractional crystallization of magnetite (ρ = 5.1 ∼ 5.2 g/cm3) will locally significantly decrease the density of basaltic melt to induce simultaneous sinking of …
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The role of fractional crystallization of water-rich magma in …
Rhyolite-MELTS forced abundant Fe-Ti oxide (ilmenite or magnetite) crystallization during the early stage of magmatic evolution and thus a rapid depletion of TiO 2 (Zimmer et …
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Magnetite layer formation in the Bushveld Complex of …
fractional crystallization of magnetite from a homogeneous body. of melt containing 57 ppm Cr 3, 27, with f. O2. between zero and one. log unit below the quartz-fayalite …
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Interpreting Multielement Geochemical Data: …
- Examples of scatter plots showing processes like fractional crystallization, magnetite separation, and zircon fractionation. This document discusses interpreting geochemical data from rock and soil samples. It provides …
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Variation in trace element content of magnetite crystallized …
The Fe-oxides magnetite and ilmenite, and in particular chromite, are useful petrogenetic indicators in igneous rocks and provide valuable information on the composition …
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Trace element fractionation in magnetite as a function of Fe …
While fractional crystallization has been shown to influence the chemistry of igneous magnetite, the extent to which this process regulates the trace element composition of …
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3 Magma, Melting, and Crystallization – Open …
Fractional crystallization, the opposite of partial melting, ... In calc-alkaline magmas, the iron is oxidized, leading to crystallization of magnetite. Consequently, when mafic minerals crystallize, iron is removed from the …
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(PDF) Trace element fractionation in magnetite as …
While fractional crystallization has been shown to influence the chemistry of igneous magnetite, the extent to which this process regulates the trace element composition of hydrothermal...
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Equilibrium high-temperature Fe isotope fractionation between …
With the data presented in this study, it is possible to assess the direction and magnitude of changes in δ 57 Fe attending differentiation by fractional crystallization if the …
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Key factors controlling the accumulation of the Fe–Ti …
The lowest Cr contents in the clinopyroxene and magnetite of the UZ (Figs. 5 g, 8 a) demonstrate that the parental magma of the UZ has experienced the most extensive fractional …
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Textural relationships and mineral compositions of Fe-Ti …
Such a transition cannot be explained by the fractional crystallization of Cr-magnetite, which would result in a continuous decrease rather than a sharp gap of Cr 2 O 3 of …
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Trace element fractionation in magnetite as a function of Fe …
Such systematic trace element variations in successive stages of magnetite can be best explained by increasing degrees of fractional crystallization with time. The wide range of …
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Genesis of the Hujiazhuang apatite-rich carbonatite complex …
Instead, the dataset illustrates a process of fractional crystallization from magnetite-calcite-apatite carbonatites to calcite carbonatites. Furthermore, we delve into the …
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Magnetite layer formation in the Bushveld Complex of South …
Here we address the origins of the Main Magnetite Layer, a globally important resource of Fe-Ti-V-rich magnetite. Previous models of in situ fractional magnetite …
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Iron isotope fractionation during crystallization and sub …
The Fe isotope fractionation owing to the extensive fractional crystallization of the magnetite can be testified by the concurrent δ 57 Fe Mt depletion along with the decreases of …
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Formation of layered intrusion: A perspective from vanadium …
However, the conventional fractional crystallization model suggests that magnetite starts to crystallize at 1151 °C at around 10% fractional crystallization and continues to …
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Magnetite Chemistry by LA-ICP-MS Records Sulfide Fractional …
Mineralogical and chemical zonations observed in massive sulfide ores from Ni-Cu-platinum group element (PGE) deposits are commonly ascribed to the fractional crystallization of …
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Magnetite composition in Ni-Cu-PGE deposits worldwide: …
Magnetite in Ni–Cu deposits is compositionally different from magnetite in layered intrusions (such as the Bushveld Complex) because sulfide and silicate liquids evolve …
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Stable zirconium isotopic fractionation during alkaline …
Clinopyroxene, amphibole, biotite, apatite, and magnetite have low Zr contents that cannot reduce the melt Zr during fractional crystallization. Chevkinite and titanite have high Zr …
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Fractional Crystallization
You may choose among olivine, orthopyroxene, augite, plagioclase, ilmenite, and magnetite as fractionating minerals. Enter the weight percent proportions of those minerals you wish to …
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Iron isotopic evolution during fractional crystallization …
38 WR values that evolve only in response to fractional crystallization. Our 39 results show that the Fe isotopic composition of a multiply-saturated (multiple phases on the 40 liquidus) magma …
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