Magnetite solubility and iron transport in magmatic-hydrothermal environments

Simon, Adam C.; Pettke, Thomas; Candela, Philip A.; Piccoli, Philip M.; Heinrich, Christoph A.

doi:10.1016/j.gca.2004.05.033

Cited by 160 publications

(90 citation statements)

References 38 publications

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“…Since H 2 O saturation is followed by significant partitioning of Cl into the fluid phase (Balcone-Boissard et al, 2008), the exsolving fluid will become Cl-rich consistent with the halite saturated inclusions in LC magnetite (Fig. 6), which in turn has the ability to scavenge from silicate melt up to several wt% Fe as FeCl 2 (Simon et al, 2004;Bell and Simon, 2011) (Fig. 12c).…”

Section: A Combined Igneous and Magmatic-hydrothermal Model For Kirunmentioning

confidence: 89%

“…It has been shown experimentally that with decompression the solubilities of Na and K increase in the brine phase at 800 °C (145-140 MPa: Na = 5.9 ± 1.8 wt% 21 and K = 11.0 ± 1.0 wt%; 110 MPa: Na = 14.0 ± 0.8 wt% and K = 15.0 ± 1.6 wt%) while iron solubility slightly decreases (145 MPa: Fe = 7.2 ± 1.6 wt%; 110 MPa Fe = 6.4 ± 0.6 wt%) (Simon et al, 2004). Consequently, Fe precipitation from brine would be possible in the pressure range of the estimated paleo depth of Los Colorados (4-3 km ~ 145-110 MPa) without the formation of simultaneous K-and Na-rich minerals during adiabatic decompression, in contrast to low salinity vapor.…”

Section: A Combined Igneous and Magmatic-hydrothermal Model For Kirunmentioning

confidence: 99%

“…11) and metals such as the REE, Fe, Cu and Au that it scavenged originallyfrom the silicate melt due to the magmatic temperatures and high salinity of the fluid (Reed et al, 2000;Simon et al, 2004Simon et al, , 2005Simon et al, , 2006Zajacz et al, 2012;Frank et al, 2011;Migdisov et al, 2014;Hurtig and Williams-Jones, 2014). The high Cl content of the fluid facilitates metal-chloride complexes and allows it to transport these metals, some of which exhibit retrograde solubility, i.e.…”

Section: Genetic Link Between Kiruna-type Ioa and Iocg Deposits?mentioning

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

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217

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: A Combined Igneous and Magmatic-hydrothermal Model For Kirunmentioning

confidence: 89%

Section: A Combined Igneous and Magmatic-hydrothermal Model For Kirunmentioning

confidence: 99%

Section: Genetic Link Between Kiruna-type Ioa and Iocg Deposits?mentioning

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

Self Cite

217

104

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“…In contrast to the systematic changes in δ 18 O values with increasing formation temperature for hematite and magnetite, δ 56 Fe values should remain relatively unchanged due to the low solubility of iron in aqueous solutions at hydrothermal temperatures (Chou and Eugster, 1977;Simon et al, 2004), slow diffusion of Fe in hematite and magnetite (Hallstrom et al, 2011), and (Klein, 2005). Siderite typically occurs as minute, single rhomb-shaped crystals or massive layers of microcrystalline aggregates (James, 1951;Trendall and Blockley, 1970;Ayers, 1972).…”

mentioning

confidence: 99%

Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history

Konhauser

Planavsky

Hardisty

et al. 2017

Earth-Science Reviews

364

257

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“…Cu, Au, Pb, Zn, Fe, Mo) as well as with other cations (e.g., H + , K + , Na + , Ca + ) which permit their transport to the site of ore deposition and cause hydrothermal alteration (Candela and Holland 1984;Williams et al 1995Williams et al , 1997Frank et al 2003;Simon et al 2004Simon et al , 2006Williams-Jones and Heinrich 2005;Zajacz and Halter 2009;Zajacz et al 2010Zajacz et al , 2012Kouzmanov and Pokrovski 2012;Pokrovski et al 2015;Tattitch and Blundy 2017).…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Amphibole and apatite insights into the evolution and mass balance of Cl and S in magmas associated with porphyry copper deposits

Chelle-Michou

Chiaradia

2017

Contrib Mineral Petrol

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Chlorine and sulfur are of paramount importance for supporting the transport and deposition of ore metals at magmatichydrothermal systems such as the Coroccohuayco Fe-Cu-Au porphyry-skarn deposit, Peru. Here, we used recent partitioning models to determine the Cl and S concentration of the melts from the Coroccohuayco magmatic suite using apatite and amphibole chemical analyses. The pre-mineralization gabbrodiorite complex hosts S-poor apatite, while the syn-and post-ore dacitic porphyries host S-rich apatite. Our apatite data on the Coroccohuayco magmatic suite are consistent with an increasing oxygen fugacity (from the gabbrodiorite complex to the porphyries) causing the dominant sulfur species to shift from S 2− to S 6+ at upper crustal pressure where the magmas were emplaced. We suggest that this change in sulfur speciation could have favored S degassing, rather than its sequestration in magmatic sulfides. Using available partitioning models for apatite from the porphyries, pre-degassing S melt concentration was 20-200 ppm. Estimates of absolute magmatic Cl concentrations using amphibole and apatite gave highly contrasting results. Cl melt concentrations obtained from apatite (0.60 wt% for the gabbrodiorite complex; 0.2-0.3 wt% for the porphyries) seems much more reasonable than those obtained from amphibole which are very low (0.37 wt% for the gabbrodiorite complex; 0.10 wt% for the porphyries). In turn, relative variations of the Cl melt concentrations obtained from amphibole during magma cooling are compatible with previous petrological constraints on the Coroccohuayco magmatic suite. This confirms that the gabbrodioritic magma was initially fluid undersaturated upon emplacement, and that magmatic fluid exsolution of the gabbrodiorite and the pluton rooting the porphyry stocks and dikes were emplaced and degassed at 100-200 MPa. Finally, mass balance constraints on S, Cu and Cl were used to estimate the minimum volume of magma required to form the Coroccohuayco deposit. These three estimates are remarkably consistent among each other (ca. 100 km 3 ) and suggest that the Cl melt concentration is at least as critical as that of Cu and S to form an economic mineralization.

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Magnetite solubility and iron transport in magmatic-hydrothermal environments

Cited by 160 publications

References 38 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

Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history

Amphibole and apatite insights into the evolution and mass balance of Cl and S in magmas associated with porphyry copper deposits

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