The chemistry of hydrothermal magnetite: A review

Nadoll, Patrick; Angerer, Thomas; Mauk, Jeffrey L.; French, David; Walshe, John L.

doi:10.1016/j.oregeorev.2013.12.013

Cited by 479 publications

(407 citation statements)

References 159 publications

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“…9c, purple area) (see figure caption for detailed information about sample location and references). All of the ore magnetite data from Los Colorados overlap best with high-T magmatic-hydrothermal data from Dare et al (2014) in agreement with the fingerprinting method of Dupuis and Beaudoin (2011) and Nadoll et al (2014). One exception (LC-04-104.4) has a distinct Zr and Hf enrichment that may arise from the accidental incorporation of some micro zircon inclusion which is more typical for a pure magmatic environment.…”

Section: Identification Of the Magnetites Origin At Los Coloradossupporting

confidence: 63%

“…8 and 9) are useful tools to distinguish between deposit types such as IOCG, porphyry, skarn, BIF and Fe-Ti-V/P-deposits, based on magnetite geochemistry (Dupuis and Beaudoin, 2011;Nadoll et al 2014;Dare et al 2014). …”

Section: A New Identification Diagram For Magnetite-rich Ore Depositsmentioning

confidence: 99%

“…The high-T hydrothermal magnetites are defined by nine deposits including e.g. IOCG deposits such as Ernest Henry, Australia and Bafq, Iran and the porphyry deposit Morococha, Peru (Bonyadi et al, 2011;Nadoll et al, 2014;Boutroy, 2014;Dare et al, 2014). The low-T hydrothermal range includes results from Fe-skarns (Vegas Peledas, Argentina), Ag-Pb-Zn veins (Coeur d'Alene, USA), disseminated magnetite in carbonate veins in serpentinite (Thompson Ni-belt, Canada), and Banded Iron Formation (Thompson Ni-Belt, Canada; Dales Gorge, Australia) from data sets of Pecoits et al (2009), Nadoll et al (2014 and Dare et al (2014).…”

Section: Figmentioning

confidence: 99%

“…IOCG deposits such as Ernest Henry, Australia and Bafq, Iran and the porphyry deposit Morococha, Peru (Bonyadi et al, 2011;Nadoll et al, 2014;Boutroy, 2014;Dare et al, 2014). The low-T hydrothermal range includes results from Fe-skarns (Vegas Peledas, Argentina), Ag-Pb-Zn veins (Coeur d'Alene, USA), disseminated magnetite in carbonate veins in serpentinite (Thompson Ni-belt, Canada), and Banded Iron Formation (Thompson Ni-Belt, Canada; Dales Gorge, Australia) from data sets of Pecoits et al (2009), Nadoll et al (2014 and Dare et al (2014). Additionally, the results of this study are compared to d) trace elements concentrations that are available in the literature for Kiruna type deposits (pink) such as the magnetite ores of El Laco andEl Romeral, Chile andKiruna, Sweden (Nystroem andHenriquez, 1994, Dupuis andBeaudoin, 2011;Dare et al 2015).…”

Section: Figmentioning

confidence: 99%

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Trace elements in magnetite from massive iron oxide-apatite deposits indicate a combined formation by igneous and magmatic-hydrothermal processes

Knipping

Bilenker

Simon

et al. 2015

Geochimica et Cosmochimica Acta

220

104

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. data demonstrate that a saline magmatic-hydrothermal ore fluid will scavenge significant quantities of metals such as Cu and Au from a silicate melt, and when combined with solubility data for Fe, Cu and Au, it is plausible that the magmatic-hydrothermal ore fluid that continues to ascend from the IOA depositional environment can retain sufficient concentrations of these metals to form iron oxide copper-gold (IOCG) deposits at lateral and/or stratigraphically higher levels in the crust. Notably, this study provides a new discrimination diagram to identify magnetite from Kiruna-type deposits and to distinguish them from IOCG, porphyry and Fe-Ti-V/P deposits, based on low Cr (< 100 ppm) and high V (>500 ppm) concentrations. Trace elements in magnetite from massive iron oxide-apatite deposits indicate a combined formation by igneous and magmatic-hydrothermal processes

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Section: Identification Of the Magnetites Origin At Los Coloradossupporting

confidence: 63%

Section: A New Identification Diagram For Magnetite-rich Ore Depositsmentioning

confidence: 99%

Section: Figmentioning

confidence: 99%

Section: Figmentioning

confidence: 99%

See 2 more Smart Citations

Trace elements in magnetite from massive iron oxide-apatite deposits indicate a combined formation by igneous and magmatic-hydrothermal processes

Knipping

Bilenker

Simon

et al. 2015

Geochimica et Cosmochimica Acta

220

104

View full text Add to dashboard Cite

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“…They help to trace the geochemical signature of the different iron oxide generations, to constrain the physico-chemical conditions of their formation and their compositional evolution with time (Nadoll et al 2014). In this study, samples of highgrade massive ore and fibrous quartz-carbonate-specularite veins, both hosted in dolomitic itabirite, from the Esperança deposit, are examined using LA-ICP-MS.…”

Section: Introductionmentioning

confidence: 99%

Chemical fingerprint of iron oxides related to iron enrichment of banded iron formation from the Cauê Formation - Esperança Deposit, Quadrilátero Ferrífero, Brazil: a laser ablation ICP-MS study

et al. 2015

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Chemical signatures of iron oxides from dolomitic itabirite and high-grade iron ore from the Esperança deposit, located in the Quadrilátero Ferrífero, indicate that polycyclic processes involving changing of chemical and redox conditions are responsible for the iron enrichment on Cauê Formation from Minas Supergroup. Variations of Mn, Mg and Sr content in different generations of iron oxides from dolomitic itabirite, high-grade iron ore and syn-mineralization quartz-carbonate-hematite veins denote the close relationship between high-grade iron ore formation and carbonate alteration. This indicates that dolomitic itabirite is the main precursor of the iron ore in that deposit. Long-lasting percolation of hydrothermal fluids and shifts in the redox conditions have contributed to changes in the Y/Ho ratio, light/heavy rare earth elements ratio and Ce anomaly with successive iron oxide generations (martite-granular hematite), as well as lower abundance of trace elements including rare earth elements in the younger specularite generations.KEYWORDS: high-grade iron ore; geochemistry; iron oxide; LA-ICP-MS analysis. RESUMO: As assinaturas químicas dos óxidos de ferro presentes no itabirito dolomítico e no minério de ferro de alto teor do Depósito de Esperança, localizado no Quadrilátero Ferrífero, indicam que processos policíclicos envolvendo mudanças nas condições químicas e de redox são res ponsáveis pelo enriquecimento em ferro na Formação Cauê do Supergrupo Minas. A variação nos conteúdos relativos de Mn, Mg e Sr nas diferentes gerações de óxidos de ferro encontradas no itabirito dolomítico, no minério de ferro de alto teor e nos veios de quartzo carbonato hematita associados à mineralização denotam uma estreita relação entre a formação do corpo de minério de ferro de alto teor e a alteração dos carbonatos. Isso indica que o itabirito dolomítico é o principal precursor do corpo de minério naquele depósito. Percolação de longa duração de fluidos hidrotermais e mudança nas condições de redox contribuíram para a alteração das razões Y/Ho, elementos terras raras leves/pesados e da anomalia de Ce com sucessivas gerações de óxido de ferro (martita hematita granular), bem como depleção dos conteúdos de elementos traço, incluindo os elementos terras raras das gerações mais recentes de especularita. PALAVRAS-CHAVE: minério de ferro de alto teor; geoquímica; óxido de ferro; análise por LA ICP MS.Chemical fingerprint of iron oxides related to iron enrichment of banded iron formation from the Cauê FormationEsperança Deposit, Quadrilátero Ferrífero, Brazil: a laser ablation ICP-MS study INTRODUCTIONThe genesis of high-grade iron ore bodies has been extensively discussed worldwide. Different processes such as hydrothermal syn-metamorphic (Guild 1953(Guild , 1957Dorr 1965Dorr , 1969, residual supergene (Dorr 1964; Eichler 1968;Melfi et al. 1976), or paleo-supergene enrichment (Morris 1980(Morris , 1987Harmsworth et al. 1990), and the juxtaposition of hypogene and supergene fluids (Hagemann et al. 1999(Hagemann et al....

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Magnetic Sensors

Edelstein

2016

Wiley Encyclopedia of Electrical and Electronics Engineering

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The different types of vector and scalar or total field magnetic sensors and the applications of these sensors are reviewed. Some of the applications have been employed for many years, such as the compasses for navigation, while others such as the detection of magnetic nanoparticles as part of drug delivery systems are much newer. Among the new phenomena are preferential tunneling of electrons with one direction of spin to increase the magnetoresistance or to change the magnetization using MgO tunnel barrier and Bose condensates for high‐resolution magnetometry. The several points that will be emphasized are the following: (i) magnetic sensors generally differ greatly in sensitivity, cost, power, and size; (ii) many different phenomena can be employed to measure magnetic fields; (iii) there are a large number and variety of applications; and (iv) the discovery of new phenomena has opened up new ways to measure magnetic fields and applications.

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The chemistry of hydrothermal magnetite: A review

Cited by 479 publications

References 159 publications

Trace elements in magnetite from massive iron oxide-apatite deposits indicate a combined formation by igneous and magmatic-hydrothermal processes

Trace elements in magnetite from massive iron oxide-apatite deposits indicate a combined formation by igneous and magmatic-hydrothermal processes

Chemical fingerprint of iron oxides related to iron enrichment of banded iron formation from the Cauê Formation - Esperança Deposit, Quadrilátero Ferrífero, Brazil: a laser ablation ICP-MS study

Magnetic Sensors

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