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Ore Deposit Geology - July 2013. Magmatic ore deposits, also known as orthomagmatic ore deposits, are deposits within igneous rocks or along their contacts in which ore minerals crystallised from a melt or were transported in a melt. Ore deposits that form in and around igneous rock units as a result of mineral precipitation from aqueous …
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The Jinshandian iron deposit contains ore minerals of magnetite, pyrite, and hematite, as well as gangue minerals of diopside, phlogopite, anhydrite, andalusite, chlorite, epidote, calcite, garnet, gypsum, and titanite. ... In addition to magmatic–hydrothermal stratabound deposits associated with Cu and Au (such as the Tongling district ...
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The origin of magnetite-(apatite) iron deposits (MtAp) is one of the most contentious issues in ore geology with competing models that range from hydrothermal to magmatic processes. Here we report melt inclusions trapped in plagioclase phenocrysts in andesite hosting the MtAp mineralization at El La …
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The origin of magnetite-(apatite) iron deposits (MtAp) is among the most contentious issue in ore geology with competing models involving purely hydrothermal to magmatic processes.
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Ore deposits are normally formed by magmatic-hydrothermal processes over a range of depths within the upper crust. However, the role of subaerial volcanic …
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Magmatic-hydrothermal iron oxide (MHIO) deposits in Mexico started forming early after the accretion of oceanic terranes to the Mexican mainland, like the Guerrero composite terrane or the Alisitos arc terrane, was complete by the end of the Early Cretaceous and the buildup of the present-day continental crust was initiated (Camprubí, …
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Porphyry deposits form at several kilometres depth in the crust and are associated with pipe- or dyke-like magmatic intrusions 11,12,13,14,15,19,20,21,22 (see Supplementary Information).These ...
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Magmatic deposits can roughly be divided into three groups. The first group includes deposits associated with primitive magmas that originate directly from the Earth's mantle such as basalt. Such basic and ultrabasic magmas can form deposits of chromium, nickel, platinum, iron, titanium, and vanadium. ... Such segregation may play …
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Iron oxide–apatite deposits can form from purely igneous (~1,000–800 °C), through late magmatic or magmatic–hydrothermal (~800–600 °C), to purely hydrothermal (<600 °C) conditions.
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These include direct magmatic segregation or crystallization, magmatic hydrothermal replacement and hydrothermal precipitation in the sense of iron-oxide-copper-gold (IOCG-type) deposits 9,10,11 ...
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This descriptive model for magmatic iron-titanium-oxide (Fe-Ti-oxide) deposits hosted by Proterozoic age massif-type anorthosite and related rock types presents their geological, mineralogical, geochemical, and geoenvironmental attributes. Although these Proterozoic rocks are found worldwide, the majority of known deposits are found within exposed …
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The deposits, which may form centimeters-, or meters-thick layer called a cumulate, are often entirely, or nearly entirely, composed of sulfide minerals. This …
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Simon, A. C. et al. Kiruna-Type Iron Oxide-Apatite (IOA) and Iron Oxide Copper-Gold (IOCG) Deposits Form by a Combination of Igneous and Magmatic-Hydrothermal Processes: Evidence from the Chilean ...
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A magmatic deposit is one in which the metal concentration takes place primarily at the same time as the formation and emplacement of the magma. ... (PageIndex{5})). Unlike many other metals, which are economically viable at grades of around 1% or even much less, iron deposits are only viable if the grades are in the …
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The Kaladawan iron deposit is located in the North Altyn Tagh and exhibits occurrences of iron ore bodies at the contact zone between Ordovician magmatic rocks (basalts, rhyolite, and granodiorite) and marble. However, controversy persists regarding the genetic classification and metallogenic mechanism of this deposit. Through a field …
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Magmatic ore deposits are masses of igneous rock enriched in useful chemical elements to such an extent that it is feasible to mine them at a profit. To be considered an ore, an accumula- ... With the sole exception of iron, the ore elements identified in Figure 2are all trace elements in primary magmas, and their
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The origin of magnetite-(apatite) iron deposits (MtAp) is one of the most contentious issues in ore geology with competing models that range from hydrothermal to magmatic processes. Here we report melt inclusions trapped in plagioclase phenocrysts in andesite hosting the MtAp mineralization at El Laco, Chile.
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Layered, ultramafic to mafic intrusions are uncommon in the geologic record, but host magmatic ore deposits containing most of the world's economic concentrations of platinum-group elements (PGE) (figs. 1 and 2). These deposits are mined primarily for their platinum, palladium, and rhodium contents (table 1). Magmatic ore deposits are …
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Magmatic Iron Ores, Chile - H.R. Naslund et al. Manganese deposits (eg., Venus, Coquimbana) composed of Mn-oxides, subordinate magnetite, and chert occur in many iron districts situated in limestones immediately overlying the volcanic rocks containing Fe ores and FeCu-Au mineralisation (Henríquez et al., 2000).
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Magmatic ore deposits, also known as orthomagmatic ore deposits, are deposits within igneous rocks or along their contacts in which ore minerals crystallised from a melt or …
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The origin of magnetite-(apatite) iron deposits (MtAp) is one of the most contentious issues in ore geology with competing models that range from hydrothermal to magmatic processes. Here we report melt inclusions trapped in plagioclase phenocrysts in andesite hosting the MtAp mineralization at El Laco, Chile. The results of our study …
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The predominant types of high-grade iron deposits in China include skarn, sedimentary metamorphic (banded iron-formation, BIF-type), continental/submarine volcanic-hosted and magmatic Fe-Ti-V ...
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Iron oxide-copper-gold (IOCG) deposits formed by magmatic-hydrothermal fluids (MH-IOCG) share many similarities with, but have important differences from, porphyry Cu ± Mo ± Au (porphyry) deposits: MH-IOCG deposits predominantly occur in Precambrian rocks, are Fe oxide rich, and have volumetrically extensive high …
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Iron oxide–apatite (IOA or Kiruna-type) deposits typically consist of a magnetite-apatite-actinolite/diopside assemblage and are spatially associated with extensive Na-(Ca) alteration and brecciation. The origin of these deposits is highly controversial and has been ascribed to the separation of iron-oxide/sulfate-(carbonate) …
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The world-renowned El Laco iron deposit in the Chilean Altiplano represents the Earth's youngest and one of the best-exposed records of iron oxide …
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Magnetite (Fe3O4): Magnetite is a common magmatic ore mineral that is an important source of iron, which is used in the production of steel and other industrial applications. Magnetite can form in a wide range of igneous rocks, including mafic and ultramafic rocks, and it can be extracted from magnetite deposits through open-pit or …
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In this study, representative magnetite samples from different types of magnetite in massive ores were prepared for analysis by SEM, electron probe …
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Mineral deposit - Formation, Geology, Ore: Mineral deposits form because some medium serves as a concentrating and transporting agent for the ore minerals, and some process subsequently causes the transporting agent to precipitate, or deposit, the minerals. Examples of concentrating and transporting agents are groundwater, seawater, and …
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@article{Woodruff2013ADM, title={A deposit model for magmatic iron-titanium-oxide deposits related to Proterozoic massif anorthosite plutonic suites: Chapter K in Mineral Deposit Models for Resource Assessment}, author={Laurel G. Woodruff and Suzanne W. Nicholson and David L. Fey}, journal={Scientific Investigations Report}, year={2013}, url ...
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The iron ore-related magmatic suites in China exhibit a compositional spectrum from mafic–ultramafic to intermediate-felsic rock suites. Following the recent classification scheme by Dill (2010), these iron deposits are categorized as: (1) Ti–Fe–(V) deposits related to mafic intrusions (high Ti); (2) apatite-bearing Fe oxide deposits (low ...
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