Growth controls in colloform pyrite

Barrie, Craig D.; Boyce, Adrian J.; Boyle, Alan P.; Williams, Patrick J.; Blake, Kevin; Ogawara, Takahiko; Akai, Junji; Prior, David J.

doi:10.2138/am.2009.3053

Cited by 75 publications

(33 citation statements)

References 77 publications

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“…Nano-and micro-scale porosity associated with metallic nanoparticles in growth zones was reported from various epithermal deposits (Deditius et al, 2011a and b). The origin of this association was interpreted to be a result of far-from-equilibrium processes related to mixing of hydrothermal fluids of different compositions or dissolution-reprecipitation of pyrite under kinetically favoured conditions (Deditius et al, 2011a and b;Pačevski et al, 2012 Huston, et al, 1995;Barrie et al, 2009;Maslennikov et al, 2009). The size of individual pyrite grains ranges from few micrometers to few centimeters.…”

Section: Zoning Textures and Conditions Of Arsenian Pyrite Formationmentioning

confidence: 99%

“…Most of the Au and As in pyrite in VHMS deposits occurs as solid solution at the concentrations below 50 ppm and 50,000 ppm, respectively. Gold and As in metamorphosed VHMS deposits and higher temperature parts of the volcanic chimneys of VHMS deposits were expelled from the pyrite structure and/or directly precipitated from the hydrothermal fluid, and form native Au, Au-tellurides, and various As-bearing minerals, and concentrations of Au may reach few hundred ppm (Huston, et al, 1995;Barrie et al, 2009;Maslennikov et al, 2009). The temperature of formation of pyrite in the VHMS deposits ranges from 420 o C to less than 100 o C, and depends on the position of the pyrite grain with respect to the central parts of the volcanic chimney; i.e., the closer the position of pyrite to the main conduit is the higher the temperature of its formation (Maslennikov et al, 2009 Agangi et al, 2013).…”

Section: Zoning Textures and Conditions Of Arsenian Pyrite Formationmentioning

confidence: 99%

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The coupled geochemistry of Au and As in pyrite from hydrothermal ore deposits

Deditius¹,

Reich²,

Kesler³

et al. 2014

Geochimica et Cosmochimica Acta

471

205

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The ubiquity of Au-bearing arsenian pyrite in hydrothermal ore deposits suggests that the coupled geochemical behaviour of Au and As in this sulfide occurs under a wide range of physico-chemical conditions. Despite significant advances in the last 20 years, fundamental factors controlling Au and As ratios in pyrite from ore deposits remain poorly known. Here we explore these constraints using new and previously published EMPA, LA-ICP-MS, SIMS, and μ-PIXE analyses of As and Au in pyrite from Carlin-type Au, epithermal Au,

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Section: Zoning Textures and Conditions Of Arsenian Pyrite Formationmentioning

confidence: 99%

Section: Zoning Textures and Conditions Of Arsenian Pyrite Formationmentioning

confidence: 99%

The coupled geochemistry of Au and As in pyrite from hydrothermal ore deposits

Deditius¹,

Reich²,

Kesler³

et al. 2014

Geochimica et Cosmochimica Acta

471

205

View full text Add to dashboard Cite

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“…Many studies used EBSD to target mechanisms of sulphide deformation at different conditions in metamorphic environments [53][54][55][56][57][58][59][60]. Other studies [61][62][63] used EBSD to address the growth of colloform and framboidal pyrite. Reddy and Hough (2013) [64] investigated Witwatersrand pyrite, linking trace element distribution patterns to sulphide deformation, and showed that some of the genetic controversies on the Witwatersrand gold ores can be explained with a model of gold mobilization before and after the re-deposition of pyrite.…”

Section: Electron Back-scatter Diffraction (Ebsd)mentioning

confidence: 99%

Advances and Opportunities in Ore Mineralogy

et al. 2017

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Abstract:The study of ore minerals is rapidly transforming due to an explosion of new microand nano-analytical technologies. These advanced microbeam techniques can expose the physical and chemical character of ore minerals at ever-better spatial resolution and analytical precision. The insights that can be obtained from ten of today's most important, or emerging, techniques and methodologies are reviewed: laser-ablation inductively-coupled plasma mass spectrometry; focussed ion beam-scanning electron microscopy; high-angle annular dark field scanning transmission electron microscopy; electron back-scatter diffraction; synchrotron X-ray fluorescence mapping; automated mineral analysis (Quantitative Evaluation of Mineralogy via Scanning Electron Microscopy and Mineral Liberation Analysis); nanoscale secondary ion mass spectrometry; atom probe tomography; radioisotope geochronology using ore minerals; and, non-traditional stable isotopes. Many of these technical advances cut across conceptual boundaries between mineralogy and geochemistry and require an in-depth knowledge of the material that is being analysed. These technological advances are accompanied by changing approaches to ore mineralogy: the increased focus on trace element distributions; the challenges offered by nanoscale characterisation; and the recognition of the critical petrogenetic information in gangue minerals, and, thus the need to for a holistic approach to the characterization of mineral assemblages. Using original examples, with an emphasis on iron oxide-copper-gold deposits, we show how increased analytical capabilities, particularly imaging and chemical mapping at the nanoscale, offer the potential to resolve outstanding questions in ore mineralogy. Broad regional or deposit-scale genetic models can be validated or refuted by careful analysis at the smallest scales of observation. As the volume of information at different scales of observation expands, the level of complexity that is revealed will increase, in turn generating additional research questions. Topics that are likely to be a focus of breakthrough research over the coming decades include, understanding atomic-scale distributions of metals and the role of nanoparticles, as well how minerals adapt, at the lattice-scale, to changing physicochemical conditions. Most importantly, the complementary use of advanced microbeam techniques allows for information of different types and levels of quantification on the same materials to be correlated.

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“…But Wu et al () had pointed out that the ore‐hosting strata above the Dabaoshan volcanic rocks should belong to the Silurian instead of Devonian, indicating that the big time gap aforementioned may not exist. Furthermore, several lines of evidence indicate that the stratiform Cu–Pb–Zn mineralization may result from volcanogenic massive sulphide mineralization instead of porphyry mineralization: (a) Pyrite in massive sulphide ores shows various textures, including recrystallization texture, cataclastic textures, and specifically colloform textures, which are widespread in volcanogenic massive sulphide deposit (Barrie et al, ; Genna & Gaboury, ). In contrast, pyrite in vein‐type ores are relatively homogeneous.…”

Section: Discussionmentioning

confidence: 99%

“…However, previous studies have demonstrated that Mo mineralization is chiefly constrained in the granitic porphyry and its contact zone with the host rock in Dabaoshan deposit (Wang, Hu, et al, 2011;Ying et al, 2017) (Barrie et al, 2009;Genna & Gaboury, 2015). In contrast, pyrite in vein-type ores are relatively homogeneous.…”

Section: Implication For the Genesis Of The Stratiform Cu-pb-zn Minmentioning

confidence: 96%

Geochronology and geochemistry of Early Silurian felsic volcanic rocks in the Dabaoshan ore district, South China: Implications for the petrogenesis and geodynamic setting

Qin

et al. 2018

Geological Journal

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The Early Paleozoic orogeny in South China has remained controversial in the long run with debate over intracontinental orogeny versus plate subduction. Limited studies have focused on the Early Paleozoic volcanic rocks in South China, which is crucial for us to understand the tectonic evolution of the South China Block. The Dabaoshan Fe–Cu–Pb–Zn–Mo–W orefield, one of the largest polymetallic deposits in South China, is hosted by Paleozoic volcanic‐sedimentary rocks and Mesozoic granitic porphyry. In this study, zircon U–Pb dating yielded ages of 439.4 ± 2.7 Ma, 439.3 ± 3.2 Ma, and 442.0 ± 2.2 Ma for the Dabaoshan dacite. These ages are all in good agreement within errors and indicate that the dacite formed during the early Silurian (ca. 440 Ma). The dacites are slightly peraluminous, calc‐alkaline with relatively high K2O + Na2O, FeOt, TiO2, CaO/Na2O ratios, and small negative Eu anomalies. They show enrichment in LILEs and LREE and depletion in Ba, Nb, Sr, P, and Ti. It has high initial 87Sr/86Sr values (0.70983–0.71140) and negative εNd(t) values ranging from −7.6 to −10 with T2DM ages of 1.80–1.99 Ga, εHf(t) values from −4.95 to −15.48 with T2DM ages of 1.72 Ga to 2.38 Ga. The overlapped Nd–Hf two‐stage model ages range from 1.89 Ga to 1.99 Ga, which indicates that the Dabaoshan dacite originated from a Paleoproterozoic source. Combining these geochemical and in situ zircon Hf isotopic data, we propose that the Dabaoshan dacite may have originated from the partial melting of mixed source of Paleoproterozoic metasedimentary and metaigneous rocks as a result of underplating of mafic magma during the post‐orogenic collapse and extension followed by lithospheric thining and asthenospheric mantle upwelling in an intraplate setting. Based on field observation and the geochronology results, we propose that the stratiform Cu–Pb–Zn mineralization may be related with the early Silurian volcanic rocks.

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Growth controls in colloform pyrite

Cited by 75 publications

References 77 publications

The coupled geochemistry of Au and As in pyrite from hydrothermal ore deposits

The coupled geochemistry of Au and As in pyrite from hydrothermal ore deposits

Advances and Opportunities in Ore Mineralogy

Geochronology and geochemistry of Early Silurian felsic volcanic rocks in the Dabaoshan ore district, South China: Implications for the petrogenesis and geodynamic setting

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