El Romeral is one of the largest iron oxide-apatite (IOA) deposits in the Coastal Cordillera of northern Chile. The Cerro Principal magnetite ore body at El Romeral comprises massive magnetite intergrown with actinolite, with minor apatite, scapolite, and sulfides (pyrite ± chalcopyrite). Several generations of magnetite were identified by using a combination of …
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2013). Thus, bulk magnetite from Los Colorados is consistent with magnetite that grew from silicate melt and/or high-temper - Figure 1. Maps of Los Colorados. (a) Location of the Los Colorados IOA deposit in Chile. Geological map shows the close relationship between
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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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Magnetite-apatite deposits are important sources of iron and other metals. A prominent example are the magnetite lavas at the El Laco volcano, Northern Chile. Their formation processes remain debated.
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PDF | On Aug 1, 1975, J.J. Frutos published Tectonic and geochemical evidence concerning the genesis of El Laco magnetite lava flow deposits, Chile | Find, read and cite all the research you need ...
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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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It is widely recognized that the Pliocene El Laco iron deposit in northern Chile is an outstanding example of extrusive magmatic magnetite deposits (also called iron oxide apatite …
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The long-standing controversy about the origin of magnetite-(apatite) mineral deposits pertains to how they form. The Pleistocene El Laco deposit in northern Chile is a critical location because ...
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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 ...
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Recent studies have shown that magnetite from IOA deposits can have large variations in textures and chemical compositions (e.g., Palma et al., 2020;Zeng et al., 2022).
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Iron-rich melts, magmatic magnetite, and superheated hydrothermal systems: The El Laco deposit, Chile Fernando Tornos; Fernando Tornos * 1. Centro de Astrobiología (CSIC-INTA). Ctra. de Torrejón a Ajalvir, km 4.5, 28850 Torrejón de Ardoz, Madrid, Spain * E-mails: ... Oxygen isotopic data for the massive magnetite ...
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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. Artículo. Open/ Download. New-contributions-to-the-understanding-of-Kiruna.pdf (5.453Mb) Publication date. 2018. Metadata. Show full item record.
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Iron oxide-copper-gold (IOCG) deposits, defined primarily by their elevated magnetite and/or hematite contents, constitute a broad, ill-defined clan related to a variety of tectono-magmatic settings.
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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 …
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Magnetite spherules in pyroclastic iron ore at El Laco, Chile. and The El Laco pyroxene deposits in northern Chile . The orebodies are situated of magnetite or a volcanic complex and minor hematite lavas and pyro-clastic
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Magnetite-(apatite) ore deposits are interpreted as being formed by the crystallization of iron-rich ultrabasic melts, dominantly generated by the interaction of silicate melts with oxidized P-F-SO4-bearing sedimentary rocks. This hypothesis is supported by geologic evidence, experimental studies, numerical modeling, stable and radiogenic isotope …
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Some later studies focused on the magnetite-apatite ores at El Laco in the Atacama desert region of northern Chile, a much younger deposit, which is often considered a modern and shallow (i.e., Pliocene-Holocene) …
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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 …
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Oxygen Isotope Composition of Magnetite Deposits at El. Laco, Chile: Evidence of Formation from Isotopically Heavy Fluids Author(s) ... the magnetite deposits at temperatures ranging from approximately 65° to 150°C in the near-surface or surficial environment. However, these fluids were volumetrically minor.
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VANADIUM RESOURCES IN TITANIFEROUS MAGNETITE DEPOSITS BY R. p. FISCHER ABSTRACT Titaniferous magnetite deposits are magmatic accumulations of magnetite and ilmenite. They commonly contain 0.2 to 1 percent V 2 0 5, most of which is concentrated in the magnetite, and they have become the world's principal source of vanadium.
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Geologists use a general size description scheme that can be used from visual inspection, sometimes with use of a hand lens, which has the divisions of fine-grained sand (0.125 to 0.25 mm), medium-grained sand (0.25 to 0.5 mm), coarse-grained sand (0.5 to 1 mm), and very coarse-grained sand (1 to 2 mm).
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The magnetite thermometry data agree with δ 56 Fe and δ 18 O stable isotope data for magnetite in several IOA deposits in Chile that are consistent with magnetite crystallising from high ...
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Here, we use trace element concentrations in magnetite and pyrite, Fe and O stable isotope abundances of magnetite and hematite, H isotopes of magnetite and actinolite, and Re-Os systematics of magnetite from the Los Colorados Kiruna-type IOA deposit in the Chilean iron belt to develop a new genetic model that explains IOCG and IOA deposits as ...
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The Pliocene El Laco volcano (northern Chile) hosts a large iron oxide deposit that occurs as stratiform bodies with underlying feeder zones (dykes) hosted by hydrothermally altered andesite lava flows. Phenocrysts in the andesite hosting the mineralization have abundant melt inclusions displaying strong evidence for melt immiscibility. Most of the pyroxene and the …
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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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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, …
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One issue of contention on the origin of magnetite-apatite deposits is the Ti content of magnetite. Kiruna-type magnetite-apatite deposits are usually depleted in Ti (e.g., Guilbert and Park, 1986, Farquhar and Chako, 1994, Williams et al., 2005, Chai et al., 2014), while magnetite in stratiform magmatic complexes is often Ti-rich (Reynolds, 1985).
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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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The resulting deposits have geological features that resemble both skarn and metamorphosed VMS deposits. This study of magnetite in the Stollberg ore field, which is the first of its type in the Bergslagen district, specifically assesses: (1) the trace-element composition of magnetite in different rock types associated with metamorphosed ...
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Based on the data presented here, we conclude that V and Ga are possibly the most reliable compatible elements in magnetite to trace ore-forming processes in the Andean IOA deposits. Magnetite chemistry reveals different conditions/events of formation for each IOA deposit ranging from high-temperature, low-oxygen fugacity (integral O-2), purely ...
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Iron-rich melts, magmatic magnetite, and superheated hydrothermal systems: The El Laco deposit, Chile. Geology. 2016; 44:427–430. [Google Scholar] Tornos F, Velasco F, Hanchar JM. The magmatic to magmatic-hydrothermal evolution of the El Laco deposit (Chile) and its implications for the genesis of magnetite-apatite deposits.
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In this study, we focus on the geochemistry of magnetite from the Cretaceous Kiruna-type Los Colorados IOA deposit ( 350 Mt Fe) located in the northern Chilean Iron Belt. Los Colorados …
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New field evidence bearing on the origin of the El Laco magnetite deposit, Northern Chile. Econ. Geol. 97, 1101–1109 (2002). CAS Google Scholar Park, F. A magnetite 'flow' in northern Chile.
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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 ...
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