Combining in situ isotopic, trace element and textural analyses of quartz from four magmatic-hydrothermal ore deposits

Tanner, Dominique; Henley, Richard W.; Mavrogenes, John; Holden, Peter

doi:10.1007/s00410-013-0912-3

Cited by 50 publications

(41 citation statements)

References 81 publications

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“…We also chose a sample containing late Au-stage pyrite (EI 1281) for more detailed analysis. These three samples were chosen because they are linked to previous studies of paragenesis and mineral chemistry (Mavrogenes et al 2010;Henley et al 2012;Tanner et al 2013Tanner et al , 2015. Their location is shown in Fig.…”

Section: Samples Sample Locationsmentioning

confidence: 99%

“…2 Simplified paragenesis of the El Indio Au-Cu-Ag deposit for samples used in this study, highlighting the difference between 'early pyrite' preceding sulfosalt deposition and 'late pyrite' associated with silica alteration (modified from Tanner et al 2015 andJannas et al 1999). FLINCs fluid inclusions be unreliable and TitaniQ estimates from this stage only record minimum temperatures (361-430 °C), as the rocks are not buffered by a Ti-bearing phase (Tanner et al 2013(Tanner et al , 2015.…”

Section: Paragenesis Of Enargite-tennantite Mineralizationmentioning

confidence: 99%

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Sulfur isotope and trace element systematics of zoned pyrite crystals from the El Indio Au–Cu–Ag deposit, Chile

Tanner

Henley

Mavrogenes

et al. 2016

Contrib Mineral Petrol

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crystals in high-temperature feeder zones range from −3.19 to 1.88 ‰ (±0.5 ‰), consistent with sublimation directly from a high-temperature magmatic vapor phase. Late pyrite crystals are distinctly more enriched in δ 34 S than early pyrite (δ 34 S = 0.05-4.77 ‰, ±0.5 ‰), as a consequence of deposition from a liquid phase at lower temperatures. It is unclear whether the late pyrite was deposited from a small volume of liquid condensate, or a larger volume of hydrothermal fluid. Both types of pyrite exhibit intracrystalline δ 34 S variation, with a range of up to 3.31 ‰ recorded in an early pyrite crystal and up to 4.48 ‰ in a late pyrite crystal. Variations in δ 34 S pyrite at El Indio did not correspond with changes in trace element geochemistry. The lack of correlation between trace elements and δ 34 S, as well as the abundance of microscale mineral inclusions and vugs in El Indio pyrite indicate that the trace element content of pyrite at El Indio is largely controlled by nanoscale, syndepositional mineral inclusions. Co and Ni were the only elements partitioned within the crystal structure of pyrite. Cu-rich oscillatory zones in early pyrite likely formed by nanoscale inclusions of Cu-rich sulfosalts or chalcopyrite, evidence of deposition from a fluid cyclically saturated in ore metals. This process may be restricted to polymetallic high-sulfidation-like deposits.

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Section: Samples Sample Locationsmentioning

confidence: 99%

Section: Paragenesis Of Enargite-tennantite Mineralizationmentioning

confidence: 99%

Sulfur isotope and trace element systematics of zoned pyrite crystals from the El Indio Au–Cu–Ag deposit, Chile

Tanner

Henley

Mavrogenes

et al. 2016

Contrib Mineral Petrol

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“…To calculate δ 18 O fluid from δ 18 O quartz , in addition to knowing the crystallization temperature, a further requirement is that the oxygen-isotope fractionation between quartz and water occurred under equilibrium conditions (Allan and Yardley, 2007;Tanner et al, 2013). Equilibrium is expected if the duration of quartz growth is longer than that of isotope exchange between water and quartz.…”

Section: Equilibrium Oxygen Fractionation Between Quartz and Fluidsmentioning

confidence: 99%

Pulsed magmatic fluid release for the formation of porphyry deposits: Tracing fluid evolution in absolute time from the Tibetan Qulong Cu-Mo deposit

Yang

Selby

et al. 2017

Geology

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The magmatic-hydrothermal evolution of porphyry-style mineralization in the shallow crust that is linked to magmatic processes at depth has been extensively studied using bulksample isotopic analysis combined with relative timing constraints. However, a lack of evaluation of the fluid evolution process against an absolute time frame limits further understanding of the ore-forming process. Here, we quantify the fluid evolution process within an absolute time frame for the first time by integrating new in situ oxygen isotope data from the Qulong porphyry Cu-Mo deposit (Tibet) with existing fluid inclusion data and high-precision Re-Os dates of co-precipitated hydrothermal quartz and molybdenite, respectively. We demonstrate that vein quartz records primary oxygen isotopic compositions and reached oxygen isotope equilibrium with ore-forming fluids, and therefore is an archive of the isotopic composition and source of the ore-forming fluids. The δ

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“…However, Fig. 9 shows that the only coupled temperature-δ 18 O measurement from El Indio quartz (in Tanner et al, 2013) plots above this field. Using the highest values from this study (16.2‰) and conservatively assuming the minimum temperature from fluid inclusion…”

Section: Accepted Manuscriptmentioning

confidence: 89%

“…The remaining sample was used for mineral separation, to extract the quartz crystals. These samples were chosen because they are linked to previous studies of paragenesis and mineral chemistry (Mavrogenes et al, 2010;Henley et al, 2012 andTanner et al, 2013).…”

Section: Samplesmentioning

confidence: 99%

Silica hydrate preserved with δ18O-rich quartz in high-temperature hydrothermal quartz in the high sulfidation copper-gold deposit at El Indio, Chile

et al. 2015

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Combining in situ isotopic, trace element and textural analyses of quartz from four magmatic-hydrothermal ore deposits

Cited by 50 publications

References 81 publications

Sulfur isotope and trace element systematics of zoned pyrite crystals from the El Indio Au–Cu–Ag deposit, Chile

Sulfur isotope and trace element systematics of zoned pyrite crystals from the El Indio Au–Cu–Ag deposit, Chile

Pulsed magmatic fluid release for the formation of porphyry deposits: Tracing fluid evolution in absolute time from the Tibetan Qulong Cu-Mo deposit

Silica hydrate preserved with δ18O-rich quartz in high-temperature hydrothermal quartz in the high sulfidation copper-gold deposit at El Indio, Chile

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