Several compositional diagrams that use minor and trace elements abundances in magnetite have recently been proposed to discriminate magnetite among different ore deposit types and help to elucidate the origin of iron oxides in a variety of ore systems (Dare et al., 2014, Dupuis and Beaudoin, 2011, Knipping et al., 2015b, Nadoll et al., 2012, Nadoll et al., 2014a).
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focus on the formation and evolution of the iron deposits associated with the AFS, most of which are composed of large amounts of (low Ti-) magnetite, actinolite and vari-able amounts of apatite (Nystro¨m and Henrı´quez, 1994). The Los Colorados iron ore deposit lacks sodic and potassic alteration that is commonly observed in hydrother-
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New contributions to the understanding of Kiruna-type iron oxide-apatite deposits revealed by magnetite ore and gangue mineral geochemistry at the El Romeral deposit, Chile Formato de cita . Copiar. Cerrar ... is concordant with a transition from magmatic to hydrothermal domains described in several IOA deposits along the Chilean Iron Belt, and ...
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In the Chilean iron belt, the spatial and temporal association of IOCG and IOA deposits has led to the hypothesis that IOA and IOCG deposits are genetically connected, where S-Cu-Au–poor magnetite-dominated IOA deposits represent the stratigraphically deeper levels of S-Cu-Au–rich magnetite- and hematite-dominated IOCG deposits.
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The textures of outcrop and near-surface exposures of the massive magnetite orebodies (>90 vol% magnetite) at the Plio-Pleistocene El Laco iron oxide-apatite (IOA) deposit in northern Chile are similar to basaltic lava flows and have compositions that overlap high- and low-temperature hydrothermal magnetite.
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Major deposits in the Chilean iron belt and Kiruna contain ... Keywords: Oxygen isotope, magnetite, iron ore, El Laco, Kiruna, Chile, Sweden. 1 Swedish Museum of Natural History, Box 50007, ...
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The textures of outcrop and near-surface exposures of the massive magnetite orebodies (>90 vol % magnetite) at the Plio-Pleistocene El Laco iron oxide-apatite (IOA) deposit in northern Chile are similar to basaltic lava flows and have compositions that overlap high- and low-temperature hydrothermal magnetite. Existing models—liquid immiscibility and complete …
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NEWFOUNDLAND - NEW MILLENNIUM CAPITAL CORP. of Montreal has completed a resource estimate on its LabMag iron ore deposit, which may be North America's largest undeveloped magnetite resource. The project is located on the Labrador Peninsula, about 30 km west of Schefferville, Que.
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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.
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A Continuum from Iron Oxide Copper-Gold to Iron Oxide-Apatite Deposits: Evidence from Fe and O Stable Isotopes and Trace Element Chemistry of Magnetite. Economic Geology, 2020, 115, 1443-1459. 3.9 36 6 A review of magnetite geochemistry of Chilean iron oxide-apatite (IOA) deposits and its implications for ore-forming processes.
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The textures of outcrop and near-surface exposures of the massive magnetite orebodies (>90 vol % magnetite) at the Plio-Pleistocene El Laco iron oxide-apatite (IOA) deposit in northern Chile …
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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 ...
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As shown by Fig. 6, like magnetite from many other Kiruna-type iron deposits, both the massive magnetite and veined magnetite at El Laco plot into the ortho-magmatic area, even though most of their δ 18 O values are higher than 4.0‰. Thus, we infer that the massive and veined magnetite in El Laco deposit might be derived from Fe-rich ortho-magmatic liquids …
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In the Chilean iron belt, the spatial and temporal association of IOCG and IOA deposits has led to the hypothesis that IOA and IOCG deposits are genetically connected, where S-Cu-Au-poor magnetite ...
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Chilean iron oxide-apatite (IOA) deposits and its implications for ore-forming processes. Ore Geol. Rev. 126, 103748 (2020). Rojas, P. et al. New contributions to the understanding of Kiruna-type iron oxide-apatite deposits revealed by magnetite ore and gangue mineral geochemistry at the El Romeral deposit, Chile. Ore Geol. Rev. 93 413-435 (2018).
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The textures of outcrop and near-surface exposures of the massive magnetite orebodies (>90 vol % magnetite) at the Plio-Pleistocene El Laco iron oxide-apatite (IOA) deposit in northern Chile are similar to basaltic lava flows and have compositions that overlap high- and low-temperature hydrothermal magnetite.
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(DOI: 10.1016/J.OREGEOREV.2020.103748) This article is published in Ore Geology Reviews. The article was published on 01 Nov 2020. The article focuses on the topics: Iron oxide copper gold ore deposits & Iron ore.
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We propose an integrated model that explains the magmatic and hydrothermal features of the unique El Laco iron deposit that is located in a Pliocene–Pleistocene volcano of …
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Pa ge 5/ 17 Finally, magnetite from the Carmen and Fresia deposits yield a similar range of calculated temperatures, i.e., ~ 750–440°C and ~ 750–360°C, respectively, and a similar average ...
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Abstract The El Laco iron deposits in northern Chile consist of magnetite (or martite) and minor hematite, pyroxene, and apatite. The orebodies are situated on a volcanic complex and resemble lavas and pyro-clastic deposits, but a magmatic origin is rejected by some geologists who regard the ores as products of hydrothermal replacement of volcanic rocks.
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They are nestled in the Chilean iron belt, between the largest iron ore mines in Chile: Cerro Negro and Los Colorados, owned by Compañía Minera del Pacífico ("CMP"). ... Admiralty's Harper South project is located near to the El Algarrobo iron ore mine, one of the four main magnetite-apatite deposits in the Chilean iron belt.
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The El Laco iron deposit, located in the Chilean Andes, has more than 1.1 Gt (resources and reserves) of massive iron ore, dominantly in the form of magnetite.
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The magnetite deposits at El Laco, Chile, have been widely cited as the type example of an iron deposit formed from direct consolidation of a magma. This study presents field, petrographic, and rare earth element (REE) evidence that shows that magnetite deposition was largely the result of hydrothermal activity.
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In this study, we present new textural and microanalytical EPMA and LA-ICP-MS data of magnetite from Carmen, Fresia, Mariela and El Romeral IOA deposits located in the …
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Keywords: Los Colorados, Chilean Iron Belt, Kiruna-type deposits, iron oxide-apatite deposits, iron isotopes, magnetite flotation; From Magmas to Ore Deposits introduCtion The Los Colorados iron oxide-apatite (IOA) mineral deposit is one of about 50 Kiruna-type IOA and iron oxide-copper-gold (IOCG) mineral deposits in the Chilean Iron Belt. The ...
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Fig. 1. Map showing the location of main IOCG and IOA deposits in the Jurassic–Early Cretaceous Central Andean IOCG Province of the Coastal Cordillera (25-31°S) and El Laco IOA deposit (23°48′S) in the high Andes of northern Chile. Modified after Barra et al. (2017). - "A review of magnetite geochemistry of Chilean iron oxide-apatite (IOA) deposits and its …
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a Backscattered electron (BSE) image of a representative apatite grain from drill core LC-04 (sample 04-99.5B in Knipping et al. 2015a, b) taken from the western massive magnetite ore body.
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This is consistent with the iron province in Missouri, where high V concentrations (>1000 ppm) and almost no Cr (~2 ppm) were detected in the magnetite of IOA deposits (Pea Ridge, Iron Mountain, Pilot Knob) in contrast to the brecciated …
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Iron oxide-apatite deposits in the Chilean Iron Belt are spatially associated with major transtensional fault zones (i.e., the Atacama Fault Zone), and the model results are …
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The 600 km-long Chilean iron belt (CIB) in Northern Chile (25–31 S) hosts numerous Mesozoic Fe-rich ore deposits, many of which are characterized as iron oxide– apatite (IOA) or iron oxide–copper–gold (IOCG) deposits (e.g., Nystro¨m and Henriquez, 1994; Oyarzu´n et al., 2003; Groves et al., 2010). The origin and classification of these
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Iron oxide-copper–gold (IOCG) and magnetite-(apatite) (MtAp) mineralization are a controversial group of ore deposits that share some common characteristics, such as the …
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A comprehensive investigation into the application of machine learning algorithms for accurately classifying mineral deposit types is presented. The study specifically focuses on iron deposits in the Portuguese Ossa-Morena Zone, employing a limited dataset of trace element geochemistry from magnetites. The research aims to derive meaningful methodological and …
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Magnetite is the most important iron ore in iron oxide-apatite (IOA) deposits which represent the Cu-poor endmember of the iron oxide-copper-gold (IOCG) clan. Magnetite chemistry has been used as a petrogenetic indicator to identify the geological environment of ore formation and as a fingerprint of the source reservoir of iron.
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Abstract The El Laco iron deposits in northern Chile consist of magnetite (or martite) and minor hematite, pyroxene, and apatite. The orebodies are situated on a volcanic complex and resemble lavas and pyroclastic deposits, but a magmatic origin is rejected by some geologists who regard the ores as products of hydrothermal replacement of volcanic rocks. This study …
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Geological map of the Montemor-o-Novo Shear Zone (adapted from [5,20] with the location of the main iron deposits that integrate with the Montemor-o-Novo Iron Complex [25,26].
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Magnetite is the main constituent of iron oxide–apatite (IOA) ore deposits, commonly referred to as Kiruna- type deposits, which can host hundreds of millions to several billion tonnes of ...
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Sources of data and methods. A total of 3126 EMPA and LA-ICP-MS spot analyses of magnetite from different Andean IOA deposits (Table S1) were compiled and used for thermometry calculations.The samples were collected from several deposits in the Early Cretaceous Chilean Iron Belt, including Los Colorados 10, 11, 44, El Romeral 22, 26, Cerro …
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Iron oxide-apatite (IOA) ore deposits occur globally and can host millions to billions of tons of Fe in addition to economic reserves of other metals such as rare earth elements, which are critical for the expected growth of technology and renewable energy resources. ... (δ 56 Fe, 56 Fe/ 54 Fe relative to IRMM-14) of magnetite from the Chilean ...
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In order to establish a regional perspective, we analyzed ore minerals from other Chilean deposits of the iron oxide (Cu-U-Au-rare earth elements [REE]) class. Magnetite from the Manto Verde iron oxide Cu-Au deposit has Os and Re concentrations of 11 to 17 parts per trillion (ppt) and 4 to 6 parts per billion (ppb), respectively.
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