Magmatic Iron Deposits
Editorial for the Special Issue "Magmatic-Hydrothermal Fe Deposits …
Steel is a foundation of national economic construction. Magnetite and hematite are the main minerals for the recovery of Fe to make steel. The main source of Fe deposits in most of the world is banded iron formation, but in China magmatic-hydrothermal Fe deposits are the main Fe-enriched (total Fe > 50%) type of deposit.
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Triple oxygen isotope variations in magnetite from iron-oxide deposits …
The formation of iron-oxide–apatite (IOA) deposits is much debated. Studies on the origin of IOA deposits have often focused on the δ 18 O values of magnetite, which were suggested to reflect isotopic equilibrium with magmas or with magmatic water; i.e., H 2 O in equilibrium with magma (e.g., Jami et al., 2007; Nyström et al., 2008; Knipping et al., 2015; …
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Magmatic immiscibility and the origin of magnetite …
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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Magmatic immiscibility and the origin of magnetite
1 Magmatic immiscibility and the origin of magnetite-(apatite) iron deposits 2 3 Dorota K. Pietruszka 1, John M. Hanchar 1*, Fernando Tornos 1,2, Richard Wirth 3, Nathan A.
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Magmatic immiscibility and the origin of magnetite-(apatite) iron deposits
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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Formation of iron oxide–apatite deposits
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 …
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The magmatic forge
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 …
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A Deposit Model for Magmatic Iron-Titanium-Oxide Deposits …
Abstract. 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.
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Geochemistry of Magmatic Ore Deposits
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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Metallogenesis of the Zhibo and Chagangnuoer volcanic iron …
Magnetite δ 18 O values from the Zhibo and Chagangnuoer deposits compared to other volcanic-hosted, magmatic iron-oxide deposits (modified after Jonsson et al., 2013). The diagram shows magnetites in equilibrium with MORB (green field) and the range for typical 'ortho-magmatic' magnetites after Taylor (1967) – (blue field).
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Dissolution–reprecipitation process of magnetite from the …
1. Introduction. Magnetite is a common oxide mineral in igneous, metamorphic, and sedimentary rocks. They also widely occur in a variety of iron ores, including BIF (banded iron formation), Kiruna-type, magmatic Fe Ti oxide, and iron skarn deposits (Dupuis and Beaudoin, 2011, Huberty et al., 2012, Nadoll et al., 2012), as well as in other types of hydrothermal …
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Iron deposits in relation to magmatism in China
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 major research and …
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Giant Kiruna-type deposits form by efficient flotation of magmatic …
Further, our model explains the observed coexisting purely magmatic and hydrothermal-magmatic features and allows a genetic connection between Kiruna-type IOA and iron oxide–copper–gold deposits, contributing to a …
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Magmatic immiscibility and the origin of magnetite-(apatite) …
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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9.3.1: Magmatic Ore Deposits
9.3.1.1 Magmatic Sulfides and Cumulates. Mafic and ultramafic magmas, like all common magmas, contain the major elements oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium. But they …
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Geochemistry of Magmatic Ore Deposits
13.8.1 Introduction. 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 …
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Triggers for the formation of porphyry ore deposits in magmatic …
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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Giant Kiruna-type deposits form by efficient flotation of …
Further, our model explains the observed coexisting purely magmatic and hydrothermal-magmatic features and allows a genetic connection between Kiruna-type IOA …
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Magmatic immiscibility and the origin of magnetite-(apatite) iron deposits
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 magmatic forge
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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Magmatic (Orthomagmatic) Deposits (Ore Deposits …
90 3 Magmatic (Orthomagmatic) Deposits … 3.1 Introduction Magmatic deposits: ores formed by direct crystallization and accumulation from a magma Deposits associated with mafic–ultramafic rocks • Chromite deposits: (i) stratiform chromite in layered intrusions, and (ii) podiform chromite in ophiolite complexes • Magmatic sulfides (Cu ...
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Types and geological characteristics of iron deposits in China
The magmatic Fe–Ti–(V) type of iron deposits is hosted in mafic–ultramafic intrusions, and is typified by the Panzhihua-subtype deposits in Hercynian gabbro and the Damiao-subtype deposits in Proterozoic anorthosite complexes. The major ore mineral is Ti–V magnetite. This deposit type accounts for 12.1% of the iron reserves of China ...
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A Deposit Model for Magmatic Iron-Titanium-Oxide …
A Deposit Model for Magmatic Iron-Titanium-Oxide Deposits . Related to Proterozoic Massif Anorthosite Plutonic Suites. U.S. Department of the Interior U.S. Geological Survey. Scientific Investigations Report 2013–5091. COVER. McIntyre mine located in the Adirondack State Park, New York (photo taken by Laurel
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Geological settings and metallogenesis of high-grade iron deposits …
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 oxide deposits. Based on a comprehensive review of current studies on these deposits, this paper suggests that the oxygen concentration in atmosphere …
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A deposit model for magmatic iron-titanium-oxide deposits …
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 …
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Magmatic immiscibility and the origin of magnetite-(apatite) iron deposits
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 reveal that …
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Magmatic ore deposits (Chapter 2)
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 solutions or hydrothermal …
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Mineral Deposits: Types and Geology | SpringerLink
The description of magmatic deposits can be carried out according to the host rock association or related to the commodity. The latter is easier and allows to summarize the main groups of deposits present in the Earth's crust from a magmatic viewpoint. ... (VMS) deposits, (3) sedimentary exhalative (SEDEX) deposits, (4) iron oxide-copper-gold ...
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Magmatic immiscibility and the origin of …
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.
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Lithospheric Fertilization and Mineralization by Arc …
Porphyry Cu ± Mo ± Au deposits (porphyry) and iron oxide copper-gold deposits formed by magmatic-hydrothermal systems (MH-IOCG) share many features, most notably enrichments in Fe, Cu, and Au, as well as an association with calc-alkaline to mildly alkaline magmas generated in orogenic (subduction to collision) and postorogenic tectonic settings.
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