magmatic magnetite ore

magmatic magnetite ore

Geosciences | Special Issue : Magmatic

Mineral deposit - Mineral deposit - Immiscible melts: A different kind of magmatic segregation involves liquid immiscibility. A cooling magma will sometimes precipitate droplets of a second magma that has an entirely different composition. Like oil and water, the two magmas will not mix (i.e., they are immiscible). The chemical principle governing precipitation of an immiscible liquid is the ...

Mineral deposit

Nyström J. O. & Henriquez F. Magmatic features of iron ores of the Kiruna type in Chile and Sweden: Ore textures and magnetite geochemistry. Economic Geology 89, 820–839 (1994). Barton M. D. & Johnson D. A. Evaporitic source model for igneous-related Fe oxide (REE-Cu-Au-U) mineralization .

Magmatic origin of giant 'Kiruna

What is Ilmenite? Ilmenite is a common accessory mineral in igneous rocks, sediments, and sedimentary rocks in many parts of the world. Apollo astronauts found abundant ilmenite in lunar rocks and the lunar regolith. Ilmenite is a black iron-titanium oxide with a chemical composition of FeTiO 3.. Ilmenite is the primary ore of titanium, a metal needed to make a variety of high-performance alloys.

Magmatic origin of giant 'Kiruna

Jan 23, 2019· The present work attempts to characterize magnetite chemistry in some collisional (Chahfiruzeh and Keder; Miocene) and pre-collisional (Reagan and Daralou; Eocene–Oligocene) porphyry copper systems hosted in the Kerman Cenozoic Magmatic Arc (KCMA). EPMA results for magnetite samples show collisional deposits have higher average contents of Fe and Ca compared …

Different Types of Iron Ore

Oct 29, 2014· The El Laco magnetite deposits consist of more than 98 % magnetite but show field textures remarkably similar to mafic lava flows. Therefore, it has long been suggested that they represent a rare example of an effusive Fe oxide liquid. Field and petrographic evidence, however, suggest that the magnetite deposits represent replacement of andesite flows and that the textures are pseudomorphs.

Characterisation of Magnetite Iron Ore

Jan 01, 2020· Magnetite is the main ore-mineral in the deposit, with pyrite as the second most abundant iron ore mineral, filling open spaces and surrounding magnetite. The magnetite is granular with straight and curved borders forming a granoblastic polygonal, with varying proportions due to oxidation.

Magmatic ore deposits (Chapter 2)

Primary textures in the Kiirunavaara apatite iron ore suggest a magmatic origin. They comprise (a) columnar development of magnetite similar to a crystal growth texture due to rapid cooling in the El Laco iron ore, Chile, (b) 'skeleton ore' with platy magnetite, locally dendritic - a widespread ore type also in the other iron deposits of the Kiruna Field, and (c) ore with thin tabular ...

Magnetite Chemistry in the Porphyry Copper Systems of ...

groups, thus probably reflecting some differences related to the distance to the magmatic source that triggered the hydrothermal system: proximal in the case of San Cristóbal and distal in Emilia. Keywords: High-K calc-alkaline magmatism, magnetite, mineral chemistry, Miocene, Pb–Zn–Fe ore deposits,

Early Fimiston and late Oroya Au–Te ore, Paringa South ...

Magmatic sulfide ore is typically associated with: (1) abrupt variations in the cumulus-mineral succession, including major ... Magnetite is also abundant in most mafic host rocks and may indicate regional targets or be a source of "noise" in mineral exploration. …

Minerals | Free Full

Other sources of magnetite iron ore include metamorphic accumulations of massive magnetite ore such as at Savage River, Tasmania, formed by shearing of ophiolite ultramafics. Another, minor, source of iron ores are magmatic accumulations in layered intrusions, which contain a typically titanium-bearing magnetite often with vanadium.

Ore Deposits Related to Magmatic Activity

Hydromagmatic magnetite iron ore deposits and skarns; Skarn ore deposits of copper, lead, zinc, tungsten, etcetera; Magmatic deposits. Magmatic nickel-copper-iron-PGE deposits including – Cumulate vanadiferous or platinum-bearing magnetite or chromite – Cumulate hard-rock titanium (ilmenite) deposits – Komatiite hosted Ni-Cu-PGE deposits

Apatite iron ores of the Kiruna Field, northern Sweden ...

Although the case for such magmatic ore formation is perhaps strongest at El Laco, evidence from other localities suggests that similar processes have been at work. The new insights derived from our models may, therefore, apply more generally to Kiruna-type deposits elsewhere.

Magmatic origin of giant 'Kiruna

Magnetic susceptibility. Magmatic Ni-Cu ore bodies at Nunavik Nickel, like most similar deposits, are mainly composed of pyrrhotite (Fe 1-x S) and varying amounts of chalcopyrite (CuFeS 2) and pentlandite ((Fe,Ni) 9 S 8). From a geophysical point of view, these minerals are indistinguishable, and their global signatures will mostly depend on ...

Magmatic Sulfide Deposits

The textures of pyrrhotite-pentlandite-chalcopyrite-magnetite are typical of magmatic ore deposits and platinum group minerals are predominantly tellurides and bismuthotellurides.

Exploring for Magmatic Ni

Sep 20, 2019· Magnetite in the Devonian Yuleken porphyry Cu–Mo deposit located in NW China witnessed complicated magmatic-hydrothermal ore-forming processes. The magnetite grains can be divided into Mag I-A (from the Beitashan Formation basalt), Mag I-B (from the porphyritic syenite wall rock), Mag II (from sodic-calcic alteration zone), Mag III-A (from ...

Mineral chemistry of magnetite from magnetite

Jun 25, 2008· Magmatic magnetite ore deposits Occasionally granite and ultrapotassic igneous rocks segregate magnetite crystals and form masses of magnetite suitable for economic concentration. A few iron ore deposits, notably in Chile, are formed from volcanic flows containing significant accumulations of magnetite phenocrysts.

Ilmenite: An ore of titanium | Uses and Properties

The magmatic affinity of Magnetite-α is further confirmed by the well-developed ilmenite exsolution lamellae observed in these grains (Fig. 2f), which are typical of Ti-rich magnetite or ...

Review of magmatic iron

Magmatic Ore Deposits: A number of processes that occur during cooling and crystallization of magmatic bodies can lead to the separation and concentration of. Get Price; magmatic iron deposits . Iron ore, Magmatic magnetite ore, Hematite ore, production and ... Magmatic ore deposits are derived from accumulations of crystals of metallic oxides ...

What is Iron Ore? (with pictures)

Magnetite from ore with a magmatic texture has a mean of 3.7‰, and the mean for magnetite intergrown with pyroxene in veins is 2.4‰. Oxygen isotope data given here, fluid inclusion results and geological evidence indicate that ore formation took place in a cooling magmatic system.

Ore Minerals : What are Ore Minerals? | Geology Page

Pyrite–magnetite is overprinted by pyrite–hematite ± anhydrite. Arsenical pyrite encloses chalcopyrite, tennantite, gold and tellurides. Gold thio-sulfide complexes, buffered by magmatic SO 2 and H 2 S in the fluid, were destabilised during the ankerite–pyrite replacement of propylitic chlorite, a reaction releasing hydrogen ions for the ...

Magnetite: South Australia's potential

Iron formation consists of iron ore such as siderite, magnetite, and hematite, with silica in the form of chert, jasper, etc., generally in bands, but sometimes not distinctly so. The bands of iron ore are at times high-grade, but are often mixed with a good deal of silica, the whole making an ore too lean for use without concentration.

Formation of the El Laco magmatic magnetite deposits by Fe ...

Magnetite from ore with a magmatic texture has a mean of 3.7‰, and the mean for magnetite intergrown with pyroxene in veins is 2.4‰. Oxygen isotope data given here, fluid inclusion results and geological evidence indicate that ore formation took place in a cooling magmatic system.

Oxygen isotope composition of magnetite in iron ores of ...

Magnetite is a rock mineral and one of the main iron ores, with the chemical formula Fe 3 O 4.It is one of the oxides of iron, and is ferrimagnetic; it is attracted to a magnet and can be magnetized to become a permanent magnet itself. It is the most magnetic of all the naturally-occurring minerals on Earth. Naturally-magnetized pieces of magnetite, called lodestone, will attract small pieces ...

Vanadium Resources in Titaniferous Magnetite Deposits

Interpretation of the mineralizing environment of magnetite-apatite deposits remains controversial with theories that include a hydrothermal or magmatic origin or a combination of those two processes. To address this controversy, we have analyzed the trace element content of magnetite from precisely known geographic locations and geologic environments from the Precambrian magnetite-apatite ore ...

What is Iron Ore? (with pictures)

The deposition of ore minerals, predominantly galena and sphalerite, occurred during the hydrothermal phase under a diminishing influence of magmatic CO 2. The mixing of ore-bearing, Mg-Na-chloride or Fe 2+-chloride, aqueous solutions with cold and diluted ground waters is the most plausible reason for the destabilization of metal–chloride ...

MAGMATIC SULFIDE DEPOSITS (MODELS 1, 2b, 5a, 5b, 6a, 6b ...

Oxygen isotope ratios in magnetite can be used to study the origin of iron-oxide ore deposits. In previous studies, only 18 O/ 16 O ratios of magnetite were determined. Here, we report triple O isotope data (17 O/ 16 O and 18 O/ 16 O ratios) of magnetite from the iron-oxide–apatite (IOA) deposits of the Yazd and Sirjan areas in central Iran.In contrast to previous interpretations of ...