Reaction of some trioctahedral micas with copper sulfate solutions at 25 degrees C and 1 atmosphere; an electron microprobe and TEM investigation

Ilton, Eugene S.; Earley, Drummond; Marozas, D.C.; Veblen, David R.

doi:10.2113/gsecongeo.87.7.1813

Cited by 19 publications

(6 citation statements)

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“…This Cu(0) may be produced by bacteria residing on the soil matrix by a biomineralization process similar to that suggested for porewater-suspended bacteria. Other processes that might be involved in Cu(0) formation in the soil matrix include abiotic reduction of Cu(II) by ferrous iron in clay minerals (Ilton et al, 1992) or in green rust (O'Loughlin et al, 2003). In contrast, Cu(II) reduction by dissolved Fe(II) did not produce metallic Cu(0) but cuprite (Cu 2 O) at pH 5.2-6.5 in a 40 mM chloride background (Matocha et al, 2005), possibly due to stabilization of Cu(I) in chloro complexes.…”

Section: Copper Speciation: Formation Of Metallic Cu(0) and Cu X S Prmentioning

confidence: 99%

Multi-metal contaminant dynamics in temporarily flooded soil under sulfate limitation

Weber

Voegelin

Kretzschmar

2009

Geochimica et Cosmochimica Acta

154

151

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Section: Copper Speciation: Formation Of Metallic Cu(0) and Cu X S Prmentioning

confidence: 99%

Multi-metal contaminant dynamics in temporarily flooded soil under sulfate limitation

Weber

Voegelin

Kretzschmar

2009

Geochimica et Cosmochimica Acta

154

151

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“…IRon and observed that anomalous Cu occurs as flattened submicroscopic inclusions oriented parallel to the locally separated layers of enclosing mixed-layer phyllosilicates which form by alteration of biotite to expandable trioctahedral clays in porphyry copper deposits and in experimental run products (Ilton et al 1992). They concluded that phyllosilicates act as sinks for Cu mineralization.…”

Section: Homogenization Of Detrital Phyllosilicates Within the Ore-bodymentioning

confidence: 99%

Preservation of Clay Minerals in the Precambrian (1.1 GA) Nonesuch Formation in the Vicinity of the White Pine Copper Mine, Michigan

1995

Clays and clay miner.

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Abstract--The Middle Proterozoic (1.1 Ga) Nonesuch Formation, host of the stratiform copper deposit at White Pine, Michigan, consists of 200 m of principally dark grey clastic sediments which contain detritus obtained dominantly from underlying mafic to intermediate volcanic rocks. Clay minerals from samples collected from the mine area and drill holes up to 100 km away have been studied using SEM, EMPA, TEM and AEM. Two morphologies of phyUosilicates, both including white mica and chlorite, occur in the 'lower' Nonesuch Formation: (1) detrital-shaped and (2) matrix. D~trital-shaped phyllosilicate grains are up to 450 microns long with long axes parallel to bedding. Matrix phyllosilicates occur as packets typically <200 .~ thick and as pore-filling cement.TEM images of detrital-shaped chlorite generally display 14-A periodicity, although 24-A corrensitelike units occur locally. Most dgtdtal-shaped chlorite from the mine area samples have a relatively restricted range of Fe/(Mg+Fe) ratios from 0.52 to 0.58, but the Fe/(Fe+Mg) ratios of detrital-shaped chlorite outside the mine area range from 0.27 to 0.64. TiO2 crystals occur within and surrounding the detrital-shaped chlorite. Matrix chlorite has Fe/(Fe+Mg) ratios of 0.47 to 0.63, indicating that it is relatively homogeneous and enriched in Fe compat~ to detrital-shaped chlorite.Detrital-shaped white mica occurs as a 2M~ polytype and generally has a phengitic composition. Matrix illite-rich I/S occurs as a 1Ma polytype, is K and AI deficient relative to end-member muscovite and contains significant Fe and Mg.The data are consistent with homogenization of detrital-shaped chlorite in the White Pine mine area by hydrothermal fluids during copper mineralization. The TiO2 crystals and corrensite-like units in detritalshaped chlorite imply that it is at least in part derived from alteration of biotite. The presence of immature 1Ma illite-rich I/S and a one layer chlorite polytype with stacking disorder suggests that the matrix clays are in their original, post-smectite state of formation as consistent with an authigenic origin during early burial diagenesis; i.e., they have not undergone subsequent transformation even though sedimentation and ore deposition occurred prior to 1 Ga.

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“…For example, electron transfer reactions have been shown to be important in the weathering at ambient temperatures of minerals such as amphibole (77) and magnetite (78), in the formation of copper ore deposits (79), and in the sorption of metals such as Cr to the mineral surface at 250C (80). Clearly, the transfer of electrons between minerals and fluids is important at physiological temperatures and, as shown in Figure 4, this redox process is strongly controlled by the crystal structure.…”

Section: Oxidation-reductionmentioning

confidence: 99%

Mineral Properties and Their Contributions to Particle Toxicity

Guthrie¹

1997

Environmental Health Perspectives

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It has been recognized since at least as early as the mid-1500s that inhaled minerals (i.e., inorganic particles) can pose a risk. Extensive research has focused on the biological mechanisms responsible for asbestos-and silica-induced diseases, but much less attention has been paid to the mineralogical properties and geochemical mechanisms that might influence a mineral's biological activity. Several important mineralogical characteristics control a mineral's reactivity in geochemical reactions and are likely to determine its biological reactivity. In addition to the traditionally considered variables of particle size and shape, mineralogical characteristics such as dissolution behavior, ion exchange, sorptive properties, and the nature of the mineral surface (e.g., surface reactivity) play important roles in determining the toxicity and carcinogenicity of a particle. Ultimately, a mineral's species (which provides direct information on a mineral's structure and composition) is probably one of the most significant yet most neglected factors that must be considered in studies of toxicity and carcinogenicity.

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Reaction of some trioctahedral micas with copper sulfate solutions at 25 degrees C and 1 atmosphere; an electron microprobe and TEM investigation

Cited by 19 publications

References 0 publications

Multi-metal contaminant dynamics in temporarily flooded soil under sulfate limitation

Multi-metal contaminant dynamics in temporarily flooded soil under sulfate limitation

Preservation of Clay Minerals in the Precambrian (1.1 GA) Nonesuch Formation in the Vicinity of the White Pine Copper Mine, Michigan

Mineral Properties and Their Contributions to Particle Toxicity

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