New field evidence bearing on the origin of the el laco magnetite deposit, Northern Chile-a discussion
The understanding of the origin of the recent (ca. 2 Ma) El Laco deposit (Fig. 1), with near 1 Gt of almost pure magnetite/hematite, is considered critical for the interpretation of the Kiruna type magnetite-apatite style of mineralization, an end-member of the IOCG group of deposits. Despite the abundant studies conducted in the last decades on El Laco, with …
Semantic Scholar extracted view of "The Magmatic to Magmatic-Hydrothermal Evolution of the El Laco Deposit (Chile) and Its Implications for the Genesis of Magnetite-Apatite Deposits" by F. Tornos et al.
The origins of Kiruna-type magnetite(-apatite) [Mt(-Ap)] deposits are contentious, with existing models ranging from purely hydrothermal to orthomagmatic end members. Here, we evaluate the compositions of fluids that formed the classic yet enigmatic Mt(-Ap) deposit at El Laco, northern Chile. We report evidence that ore-stage minerals crystallized from …
The Sandaozhuang super-large W-Mo deposit is located in the southern margin of the North China Craton, within the well-known East Qinling Mo mineralization belt, and is one of the typical skarn-type W-Mo deposits in China. Based on EMPA and LA-ICP-MS analyses, major and trace elements were presented, and the mineral chemistry of …
In order to better constrain the origin of Andean IOA deposits, we focused on the Cretaceous Cerro Negro Norte deposit located in the Chilean Iron Belt, northern Chile. The Cerro Negro Norte magnetite ore is hosted in andesitic rocks and is spatially and genetically associated with a diorite intrusion.
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 …
We present an extensive set of new and combined iron and oxygen isotope data from magnetite of Kiruna-type ores from Sweden, Chile and Iran, and compare them with new global reference data from ...
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 …
Magnetite is a mixed iron ( II )/iron ( III) oxide and its magnetism, hardness, density and catalytic properties combine to generate its importance. Massive deposits of magnetite were formed ...
Magnetite (hematite) -apatite deposits are common in Proterozoic and Phanerozoic Fe–Cu–Au districts worldwide (e.g., Kiruna district, Sweden; Cloncurry district and Gawler Craton, Australia; Copiapo district, Chile; Mark and Foster, 2000, Williams et al., 2005 ). They are characterized by a mineral association of magnetite …
El Romeral iron mine is in the coastal iron province of northern Chile, a north-trending belt of magnetite deposits about 30 km wide and 600 km long.Iron at El Romeral is mined from two orebodies in which magnetite is microscopically intergrown with actinolite. The Main orebody is a lenticular, steeply dipping magnetite-rich mass in a reentrant between two …
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
Emplacement and precipitation of the suspension results in the formation of magnetite grains with core-to-rim features that record a transition from purely igneous to magmatic-hydrothermal conditions within IOA deposits.
This two-part investigation focuses on Fe- and Si-rich melt inclusions in plagioclase phenocrysts, in andesite, that hosts the El Laco magnetite- (apatite) (MtAp) deposit in Chile. The first part, a high-resolution study of the mineralogy, micro-textures, chemical composition, and phase relationships of the immiscible melt inclusions reveals that the …
Magnetite or black sand mining is supposed to be banned in the Philippines, but Moncano explained that the extraction of the said mineral offshore is allowed. He said, "Mining in shoreline is prohibited but offshore mining is allowed. If it is at least 1,500 meters from the shoreline going out to the sea, it is allowed.".
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.
The synergistic corrosion effect of microorganisms and deposits on carbon steel corrosion was assessed with magnetite and sand. In the presence of the…
The Montecristo district, northern Chile, is one of the few places worldwide where there is a direct relationship between magnetite-(apatite) (MtAp) mineralization and iron oxide-copper–gold (IOCG) mineralization. The MtAp mineralization includes ...
The deposit mineral assemblage is made up of non-valuable phases comprising mostly magnetite, hematite, chromite, monazite, and the valuable phases dominated by ilmenite (50.91 wt. %), with additional zircon and rutile (9.96 and 3.52 wt. % respectively). The total heavy minerals comprise about 5% volume, of which 2 % are valuable heavy minerals ...
In order to better constrain the origin of Andean IOA deposits, we focused on the Cretaceous Cerro Negro Norte deposit located in the Chilean Iron Belt, northern Chile. The Cerro Negro Norte magnetite ore is hosted in andesitic rocks and is spatially and genetically associated with a diorite intrusion.
The clear volcanic and subvolcanic character of the El Laco iron-oxide deposits has transformed this volcanic complex into a unique phenomenon. As far as known, no other magnetite lava flows have been described except for …
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 ...
Details of the common iron ore and associated gangue minerals found in many iron ore deposits and iron ore products are given in Table 2.1. The three most common iron ore minerals are magnetite, hematite (the spelling "hematite" is preferred here over "haematite"), and goethite, which together account for an estimated > 99% of the …
Semantic Scholar extracted view of "THE MONTECRISTO IRON OXIDE-COPPER-GOLD (IOCG) DISTRICT IN NORTHERN CHILE: NEW EVIDENCE ABOUT THE GENETIC RELATIONSHIP BETWEEN IOCG AND MAGNETITE- (APATITE) DEPOSITS" by L. …
The objective of this study is to expand upon earlier trace-element studies of magnetite associated with metamorphosed massive sulfide and skarn deposits by evaluating the trace-element composition of magnetite in metamorphosed carbonate-associated massive sulfide deposits (Gränsgruvan, Tvistbo, Norrgruvan, Cedercreutz, Baklängan and …
Immiscible iron- and silica-rich melts and magnetite geochemistry at the El Laco volcano (northern Chile): Evidence for a magmatic origin for the magnetite deposits
Magnetite associated with gold mineralization forms fine, disseminated grains, suggesting that the coarse-grained magnetite recovered in till does not originate from the gold veins. Till tourmaline and scheelite carry the signature of the orogenic gold deposits and can thus be used for exploration in overburden sediments.
PDF | On Jan 1, 2020, Tobias Keller and others published Magnetite-Apatite Deposits at El Laco, Chile, Formed by Eruption of Fe-Rich Immiscible Melt | Find, read and cite all the research you need ...
The gold deposits are associated with subvolcanic andesitic to dacitic intrusions emplaced into coeval volcanic rocks. Both the Verde and Pancho deposits are zoned in space from a deeper zone of banded quartz veinlets associated with chlorite-magnetite-albite and/or pyrite-albite-clay alteration to a shallow zone of pyrite-albite-clay …
