These findings strongly support the conclusion that the Beizhan iron deposit underwent a process of magmatic–hydrothermal mineralization. The Beizhan iron deposit (468 Mt at an average grade of 41% Fe) is the largest iron deposit in the Awulale iron metallogenic belt of Western Tianshan, northwest China. The high-grade magnetite …
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The largest VMS deposits, about twice the size of the Kidd, are the Windy Craggy deposit in British Columbia, discovered in 1958, and the Rio Tinto deposit in Spain, discovered in 1972. The quality of the ore in massive sulfide deposits is high, host rocks are generally greater than 60% ore minerals, so even if they are small, massive …
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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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Au-poor magmatic-related deposits form from dominantly asthenospheric or crustal melts (such as Cu-rich or W-Sn porphyry, respectively). ... and distinction from other epigenetic iron oxide ...
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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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Here, we provide new evidence that supports subaerial volcanic eruptions in magmatic arcs as a viable process for the accumulation of metals at or near the surface …
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The Plio-Pleistocene El Laco magnetite ore bodies in the Chilean Altiplano represent an unusual subvolcanic/aerial type of an iron oxide-apatite (IOA) deposit. The textures of these magnetite ore bodies have sustained a long-standing geological controversy on the origin of iron oxide deposits with models spanning the spectrum …
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Mineral deposit - Magmatic Cumulates: Magmatic segregation is a general term referring to any process by which one or more minerals become locally concentrated (segregated) during the cooling and crystallization of a magma. ... Cumulus deposits of magnetite make poor iron ores, because cumulus magnetites invariably contain elements such as ...
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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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The third mechanism for the formation of silicate-hosted iron deposits is the deep-seated magmatic differentiation where the ore-forming materials and magma are of the same origin and both come from the upper mantle (Lin et al., 1984, Lin and Xu, 1989, 1998; Pei et al., 1985). It is believed that the direct ore-controlling factor for the ...
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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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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. ... iron deposits are only viable if the grades are in the order of 50% iron. Figure 8.1.6 Banded iron formation from an unknown location in North America on display at a museum in …
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The Zhaoanzhuang magnetite-apatite deposit (113°29ʹE, 33°22.5ʹN) is located in Wugang City of the Henan province in the southern North China Craton (NCC) (Fig. 1 A).The ore deposit has an ore reserve of>96 million metric tons (Mt) at > 40 wt% Fe and 4.8 Mt at 2.0 wt% P, making it one of the largest iron deposits in the southern NCC.
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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 …
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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 …
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Abstract - The El Laco magnetite-apatite ore deposits in the Andean Cordillera of northern Chile occur as massive, tabular bodies, as stratified, pyroclastic ores, and as crosscutting dykes...
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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-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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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 primary mechanism of formation of skarn iron deposits is hydrothermal activity associated with contact metasomatism (Edwards and Atkinson, 1986, Hall et …
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Iron oxide–apatite deposits, including the massive deposits at Kiruna, Sweden (Fig. 1), are principally comprised of magnetite and apatite minerals.Models for their formation range from purely ...
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The magmatic model suggests that iron ores are precipitated from highly evolved iron-rich melts segregated from subvolcanic silicate magmas, whereas the …
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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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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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1. Introduction. China has a rich reserve of iron ores, and hosts most of the major types of iron deposits recognized over the world. However, most of these deposits are low-grade ores (<50% Fe), and the high-grade iron ores only account for ∼1% of the total iron ore resources (Zhang et al., 2014a).During 50s to 70s of the last century, two …
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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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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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Formation of various types of iron ore deposits by concentration of iron in the Earth's surface environments. Tsubasa OTAKE, Yoko ... There are various geological processes that concentrate Fe and form Fe ore deposits, including magmatic, hydrothermal, and sedimentary processes. Fe ore deposits can be divided into orthomagmatic type (or Fe …
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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 among the most contentious issue in ore geology with competing models involving purely hydrothermal to magmatic processes.
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