These include direct magmatic segregation or crystallization, magmatic hydrothermal replacement and hydrothermal precipitation in the sense of iron-oxide-copper-gold (IOCG-type) …
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
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.
Magmatic Nickel Deposits . ... 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 order of 50% iron and if …
Iron oxide–apatite deposits can form from purely igneous (~1,000–800 °C), through late magmatic or magmatic–hydrothermal (~800–600 °C), to purely …
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 …
iron deposits in the Coastal Cordillera of Chile also have features that suggest a magmatic origin. Associated with these magmatic ore deposits are economic and sub-economic concentrations of Cu ...
1. Introduction. Apatite [Ca 10 (PO 4) 6 (F, Cl, OH)] is a common accessory mineral in igneous rocks, with usually less than 1% modal abundance (Piccoli and Candela, 2002, Spear and Pyle, 2002, Patiño Douce and Roden, 2006), but can constitute a major phase in iron oxide-apatite (IOA) or "Kiruna-type" deposits.These mineral deposits …
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 …
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 …
PDF | On Aug 12, 2022, Liping Zeng and others published ORIGIN OF HIGH-Ti MAGNETITE IN MAGMATIC-HYDROTHERMAL SYSTEMS-EVIDENCE FROM IRON OXIDE-APATITE (IOA) DEPOSITS OF EASTERN CHINA | Find, read ...
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 ...
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 …
Magmatic Deposits. 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. Most of the nickel mined in the world, and much of the copper, comes from magmatic deposits such as those in Indonesia, Canada, southern Africa, Australia and …
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 …
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 ores are hosted in the Carboniferous volcanic rocks with extensive development of skarn alteration assemblages. While considerable progress …
The ilmenite likely exsolved from the host magnetite as a result of a decrease in temperature accompanied by a change in fO 2 conditions and is distributed along cleavage or lattice planes within the magnetite, a texture that is common in magmatic iron deposits (Badmatsyrenova and Orsoev 2005). This means that the LA–ICP–MS …
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.
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 ...
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 …
@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 ...
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 …
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 ...
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 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 ...
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 …
The Iron Springs deposits have been described as being of magmatic–hydrothermal origin 22,23,24, on account of their skarn-like features, which include massive replacement-style ore bodies that ...
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 …
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 ...
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 …
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 ...
To a lesser degree, iron is also preferentially partitioned into the sulfide liquid and, because of its greater abundance, most immiscible sulfide liquid is iron-rich. ... magmatic-sulfide deposits. Magmatic sulfide ore is typically associated with: (1) abrupt variations in the cumulus-mineral succession, including major