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The Zhaoanzhuang magnetite-apatite deposit (113°29ʹE, 33°22.5ʹN) is located in Wugang City of the Henan province in the southern North China Craton (NCC) (Fig. 1 A).The ore deposit has an ore reserve of>96 million metric tons (Mt) at > 40 wt% Fe and 4.8 Mt at 2.0 wt% P, making it one of the largest iron deposits in the southern NCC.
The Prominent Hill deposit is a large iron oxide copper-gold (IOCG) resource located in the Olympic IOCG province of South Australia. The deposit is hosted by brecciated sedimentary rocks and structurally underlying lavas of the ca. 1.6 Ga Gawler Range Volcanics. Both rock units are altered and mineralized, forming characteristic …
August 22, 2013. This descriptive model for magmatic iron-titanium-oxide (Fe-Ti-oxide) deposits hosted by Proterozoic age massif-type anorthosite and related rock types …
Peña Colorada is a magmatic-hydrothermal iron deposit of the magnetite-apatite type, dated at 63.26 to 48.18 Ma (40 Ar/ 39 Ar ages from K-feldspar). It is made up of three main stages of ...
Reference samples for low-temperature or hydrothermal iron ore deposits include magnetite from the polymetallic magnetite-skarn deposit at Dannemora (n = 4), the banded iron formation at Striberg ...
These include direct magmatic segregation or crystallization, magmatic hydrothermal replacement and hydrothermal precipitation in the sense of iron-oxide-copper-gold (IOCG-type) deposits 9,10,11 ...
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 ...
In some important deposit classes, including iron oxide copper gold (IOCG) and rare earth element (REE) deposits, it is commonly observed that early magnetite is replaced by hematite in the main ...
These ore deposits are described further in Chapter 3. Petrological and geochemical background to magmatic ore formation. Processes of magma development. Magmas evolve in magmatic systems. A magmatic system is the site of melting, the pathway of magma migration and the site of crystallisation within a specific geological and tectonic …
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 …
The occurrence of diverse iron oxide deposit types within the Great Bear magmatic zone, makes this region favourable for exploration and for the study of the Proterozoic iron oxide class as a whole. 1
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. ... F. & Hanchar, J. M. Iron-rich melts, magmatic magnetite, and superheated hydrothermal systems: The El Laco deposit, Chile. Geology 44, 427–430 (2016). doi:10. ...
Abstract - The El Laco magnetite-apatite ore deposits in the Andean Cordillera of northern Chile occur as massive, tabular bodies, as stratified, pyroclastic ores, and as crosscutting dykes...
Another typical example is the Xishimen iron deposit, which is located in the South of Hebei Province, China. It has been considered as a skarn-type iron deposit conventionally. However, many geological evidence suggests that Xishimen iron deposit is a magmatic iron deposit instead. Such evidence includes: 1.
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. Rocks formed as a result of magmatic segregation are called magmatic cumulates. While a magma may start as a …
δ 34 S CDT values of colloform pyrite from the Jinshandian skarn iron deposit range from 17.22‰ to 20.63‰ and are substantially higher than those of sulfur compositions of magmatic–hydrothermal fluid (−3‰ to +1‰) (Field and Gustafson, 1976, Shelton and Rye, 1982). These values indicate that Jinshandian colloform pyrite was not ...
General outline of the iron deposits in relation to magmatism. The iron ore-related magmatic suites in China exhibit a compositional spectrum from mafic–ultramafic …
Iron oxide–apatite (IOA or Kiruna-type) deposits typically consist of a magnetite-apatite-actinolite/diopside assemblage and are spatially associated with extensive Na-(Ca) alteration and brecciation. The origin of these deposits is highly controversial and has been ascribed to the separation of iron-oxide/sulfate-(carbonate) …
The magmatic forge. Nature Geoscience 13, 716–717 ( 2020) Cite this article. Time capsules of fluid, trapped within the oxide minerals from two iron ore deposits reveal an important role for ...
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 …
EconomicGeology Vol. 86, 1991, pp. 1346-1349 SCIENTIFIC COMMUNICATIONS MAGNETITA PEDERNALES: A NEW MAGMATIC IRON DEPOSIT IN NORTHERN CHILE ENRIQUE GREZ, ANGELO AGUILAR, Gold Fields Chile S.A., CarmenSilva 2449, Casilla 9134, Santiago,Chile FERNANDO HENRIQUEZ, Universidadde Santiago,Casilla 10233, …
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 …
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 Pilot Knob magnetite deposit (PKM) is located in Iron County, Missouri, USA (Fig. 1), and was mined from 1968 to 1980, producing 20 million tons averaging 35–40% iron (Kisvari, 1990).The deposit consists of a series of tabular forms that strike northwest and dip about 45° southwest (Figs. 2 & 3), approximately parallel to …
Mafic and ultramafic magmas, like all common magmas, contain the major elements oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium. But they typically also contain …
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. ... (Figure 20.7). 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 they ...
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. We study...
Numerous iron deposits occur in the volcanics basins in the Lower Yangtze River Belt (LYRB; Fig. 1 A), which is an important Mesozoic Fe–Cu–Au metallogenic belt in eastern China (Zhai et al., 1992; Mao et al., 2011).Some of these deposits show many characteristics similar to the iron-oxide–apatite (IOA) deposits around the world and …
Kiruna-type iron deposit, also known as iron oxide-apatite (IOA) deposit, is one of world main iron sources, which are formed in various geological contexts, worldwide and throughout the geological time. ... an iron-rich magmatic origin which was supported by the volcanic structures of the magnetite ores, e.g., basaltic-like lava flows ...
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 …
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