The concentration of iron in chloride solutions equilibrated with synthetic granitic compositions; the sulfur-free system

Whitney, James A.; Hemley, J. J.; Simon, F.O.

doi:10.2113/gsecongeo.80.2.444

Cited by 101 publications

(41 citation statements)

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“…Strong partitioning of chalcophile elements into a supercritical fluid from a granite (Holland, 1972;Candela and Holland, 1984;Whitney et al, 1985), as well as H2S and H2 with H20 , could be responsible for the chlorite-sulfide assemblage. Alternatively, alteration of ferromagnesium phases in the True Hill granite at considerable depth could enrich the Stage 1 fluid in Fe, Mg and Mn.…”

Section: Discussionmentioning

confidence: 99%

The pedogenesis of tin- and sulfide-lode mineralization at True Hill, southwestern New Brunswick

Lentz

McAllister

1990

atgeol

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The subvolcanic True Hill granite porphyry in southwestern New Brunswick is genetically related to the Beech Hill series of granites of Devono-Carboniferous age. Three True Hill (TH) greisenised granite porphyry cupolas host Bi-Sn-Mo-W mineralized zones that have similarities to the nearby W-Mo-Bi orebodies at Mount Pleasant (MP).Tin-bearing lodes (0.03 to 0.66 wL % Sn) are developed along faults and fractures that cut both mineralized (Bi-Sn-Mo-W) and unmineralized True Hill granite porphyry and enclosing metasedimentary rocks of the Waweig Formation. Within these lodes, particularly the central Main lode, two types of mineralization are present, an early chlorite-sulfide assemblage (Stage 1) and a later hematite-phengite-cassiterite assemblage (Stage 2) that replaces, in part, the earlier Stage 1 assemblage. The Stage 1 assemblage consists of Fe-rich septechlorite, pyrite, low-Fe sphalerite, magnetite, chalcopyrite, galena, Pb-Bi sulfides, tennantite, arsenopyrite and native Ag. Fe-Mg-Mn metasomatism responsible for chloritization was coincident with leaching of alkali and alkali-earth elements during feldspar hydrolysis. The Stage 1 assemblage (chl-sulfide) was formed at low temperature (<200°C) and low oxygen fugacity. The Stage 2 assemblage includes hematite, phengite, cassiterite and monazite with minor late quartz and fluorite. This assemblage was deposited at slightly higher temperatures (200p-300pC), higher oxygen fugacity (above hematite-magnetite buffer) and at moderate pH 's (

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Section: Discussionmentioning

confidence: 99%

The pedogenesis of tin- and sulfide-lode mineralization at True Hill, southwestern New Brunswick

Lentz

McAllister

1990

atgeol

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“…On the other hand, in the experiments for the pressure dependence, pressures were controlled in the range from 500 to 1000 bars under the constant temperature of 600°C. Based on the experiments for granitic compositions by Whitney et al (1985), the run duration was fixed to 7 days for the experiments at the temperatures above 500°C, and 14 days for the experiments at lower temperatures. The temperature was measured with a chromel-alumel thermocouple attached to the outer wall of the pressure vessel.…”

Section: Methodsmentioning

confidence: 99%

“…Experiments on the interaction between seawater and rhyolite, andesite, basalt and peridotite have been conducted by Hajash and Chandler (1981) in the temperature range from 200 and 500°C, 1000 bars. Whitney et al (1985) carried out the experiments using synthetic granitic rocks in the temperature range from 400 to 700°C, 1000 bars. In the latter experiments, only iron was monitored among transition elements and the experimental pH was controlled to be low (0.67<pH< 3.84).…”

Section: Introductionmentioning

confidence: 99%

Cation Leaching from the Basalt JB–1a by 2M NaCl Hydrothermal Solutions

Uchida¹,

Tsutsui²

2000

Resource Geology

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Abstract:The basalt JB-1a was reacted with 2M NaCl solutions, and the leaching behavior of the cations Na, K, Ca, Mg, Fe, Mn, Zn and Co was monitored. The experiments were carried out using standard cold-seal pressure vessels in the temperature range from 300 to 800°C under the constant pressure of 1000 bars and also in the pressure range from 500 to 1000 bars at 600°C.The concentrations of Fe, Mn, Zn and Co in the hydrothermal solutions increased significantly with increasing temperature and with decreasing pressure. The thermodynamic analysis of the experimental results suggests that this is due to the formation of trichloro-complexes and also partly due to the temperature dependence of ion exchange between augite and aqueous chloride solution. The Na concentration in the aqueous solution decreases with increasing temperature and with decreasing pressure. On the other hand, the behavior of K, Ca and Mg is complex and their concentrations seem to be controlled by the coexisting minerals.Judging from the experimental results, it is concluded that the transition elements are effectively leached from the basalt under higher temperatures and lower pressures. This means that higher temperature and lower pressure conditions are preferable for the production of ore-forming hydrothermal solutions.

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“…By analogy, Whitney et al (1985) have shown that high iron contents can be stabilized in high-temperature, highsalinity aqueous fluids. In central Chile, none of the magmas are especially sodic.…”

Section: Implications For Apatite-magnetite Ore Genesis Modelsmentioning

confidence: 99%

Variations in F and Cl contents in apatites from magnetite—apatite ores in northern chile, and their ore-genetic implications

Treloar

Colley

1996

Mineral. mag.

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Magnetite-apatite deposits associated with the Atacama Fault Zone of northern Chile are interpreted here, on field criteria, as being the products either of hydrothermal fluids with a strong magmatic signature, or of latestage Fe-rich magmas mixed with an aqueous fluid. Even in the Chilean iron belt, apatite-rich magnetite deposits are a rarity. Variations in F-and C1-contents in apatites, strongly zoned with respect to halogens, are indicative of primary variations in fHF and fHCI in the hydrothermal fluids. Small variations in halogen fugacities in the aqueous fluid are capable of buffering large variations in halogen content within apatite crystals in equilibrium with that fluid. The recorded halogen zonation profiles are inconsistent with crystallization of the apatites simply from a volatile-rich, late-stage fractionation Fe-rich magma, or its derived magmatic vapour. It is more likely that they are the result of mineral-fluid buffering with a fluid that represents the mixing of a magmatically-derived aqueous fluid with a meteoric fluid that has variably scavenged Ca and C1 from within the country rocks. The source magma of the former is probably an Fe-P enriched acidic magma, derived by fractionation of primary calc-alkaline basic magmas.

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The concentration of iron in chloride solutions equilibrated with synthetic granitic compositions; the sulfur-free system

Cited by 101 publications

References 0 publications

The pedogenesis of tin- and sulfide-lode mineralization at True Hill, southwestern New Brunswick

The pedogenesis of tin- and sulfide-lode mineralization at True Hill, southwestern New Brunswick

Cation Leaching from the Basalt JB–1a by 2M NaCl Hydrothermal Solutions

Variations in F and Cl contents in apatites from magnetite—apatite ores in northern chile, and their ore-genetic implications

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