Lead/lead-alloy as a corrosion-resistant outer layer ...
Long-term corrosion experiments on lead in high ionic strength solutions at various partial pressures of CO 2 (g) indicate that lead corrosion is passivated owing to the formation of lead carbonate (PbCO 3, cerussite).. In a new design for a geological repository for nuclear waste, lead/lead alloy is proposed as a corrosion-resistant outer layer packaging material.
Crustal magmatic controls on the formation of porphyry ...
However, higher Fe contents and lower pressure magma differentiation can lead to later sulfide saturation (Fig. 2) in shallow magma reservoirs (5–15 km depth) compared with deeper reservoirs in ...
Architecture and emplacement of the Nebo–Babel ...
The Nebo–Babel Ni–Cu–platinum-group element (PGE) sulphide deposit in the West Musgrave Block, Western Australia, is the largest nickel sulphide discovery in the last 10 years. The deposit is hosted within a concentrically zoned, olivine-free, tube-like (chonolithic), gabbronorite intrusion associated with the, approximately, 1,078-Ma Giles Complex-layered …
Hydrothermal Sulfide Deposits
Copper Emplacement •Copper ores are widely disseminated throughout the world. •One of the more classic deposits was mined for decades ... from the Greek molybdos meaning "lead" Sulfide Minerals. Molybdenite (MoS 2) continued… •Occurrence: accessory mineral in granite pegmatites and in porphyry copper deposits •Associated Mins ...
Supergene Nonsulfide Zinc-Lead Deposits: The Examples …
"Nonsulfide zinc" is a very general term, referred to a group of ore deposits consisting of Zn-oxidized minerals, mainly represented by smithsonite, hydrozincite, hemimorphite, sauconite and willemite, which are markedly different from sphalerite ores, typically exploited for zinc. Locally, Ag minerals can occur too. The supergene nonsulfide deposits form from low-temperature …
--UCAS
（60） Sulfide-saturation and magma emplacement in the formation of the Permian Huangshandong Ni-Cu sulfide deposit, Xinjiang, NW China, Economic Geology, 2013, 1 （61） The Design of Re-usable Carius Tubes for the Determination of Rhenium, Osmium and Platinum-Group Elements in Geological Samples, Geostandards and Geoanalytical Research, …
New lead isotope determination from five Proterozoic ...
Small deposits of molybdenum, tungsten, and uranium formed during the emplacement of the younger granites. The lead isotopic compositions of sulfide trace lead from the …
Lead-isotopic data from sulfide minerals from the Cascade ...
Lead-isotopic studies of mineral deposits associated with Tertiary plutons found in the Cascade Range of Oregon and Washington demonstrate a rather uniform isotopic composition in various sulfide minerals ( 206Pb 204Pb = 18.84 to 19.05; 207Pb 204Pb = 15.57 to 15.62; 208Pb 204Pb = 38.49 to 38.74), show less variation than data from the volcanic rocks of the Cascade Range …
POLYMETALLIC VEIN AND REPLACEMENT DEPOSITS …
Emplacement of these intrusions triggered ore formation and they host polymetallic veins and disseminations that contain iron, lead, zinc, and copper sulfide minerals. Some polymetallic replacement deposits are associated with skarn deposits in which host carbonate rocks are replaced by
Chapter 5 - Thermodynamic and Transport Properties of ...
eruption or emplacement of magma, its subsequent quenching or solidification, and interaction in hydrothermal magmatic systems. These processes involve simultaneous consideration of heat, mass, and momentum transport between relevant magmatic sub-systems. Rates of momentum, heat, and mass transfer are widely
Atmospheric S and lithospheric Pb in sulphides from the 2 ...
Abstract Lead and multiple sulphur isotope compositions were measured in-situ by SIMS on sulphide minerals from phoscorites and carbonatites of the ca. 2.06 Ga Phalaborwa Complex in South Africa. Additionally, sulphide mineral separates and bulk ...
Selective hydrometallurgical separation of lead from ...
At this point the following will have been accomplished: (1) lead sulfide will be converted to lead sulfate; (2) pyrite, sphalerite, chalcopyrite will be unaffected; (3) in the conversion of (1) above, there is a change in crystal structure and the cementing action of the lead sulfide in the original ore or concentrate is eliminated.
Historic Mines - sites.uni.edu
Ore occurs as coatings on boulders within the brecciated ore body. Mineralization includes galena (lead sulfide), sphalerite (zinc sulfide), and pyrite (iron sulfide). Silver occurred in the galena ore at about 68 ounces of silver per ton of galena. Between $500,000 and $1,000,000 worth of silver and lead were recovered from the Bull-Domingo Mine.
Protracted mafic magmatism and two-stage mineralization …
Emplacement mechanism of the sulfide-rich suite in the Kalatongke sulfide deposit It is widely accepted by most researchers that the parental magma of the Kalatongke Cu-Ni sulfide deposit underwent saturation in sulfide liquid through the assimilation of surrounding rocks ( Zhang et al., 2009 ).
Unradiogenic lead in Earth's upper mantle | Nature …
The mantle and continental crust contain excessive amounts of radiogenic lead, implying that a complementary reservoir of unradiogenic lead should exist somewhere on Earth. Isotopic analyses of ...
All minerals in the sulfate and sulfide groups contain ...
Sulfate minerals contain the ion SO42- and generally have a vitreous to dull luster.Sulfide minerals contain the ion S2- and tend to have a metallic luster.Sulfate minerals include the SO42â ...
CU, AU, AND ZN-PB SKARN DEPOSITS (MODELS 18b,c; …
that lead to formation of all types of skarn deposits include: (1) isochemical contact metamorphism during pluton emplacement, (2) prograde metasomatic skarn formation as the pluton cools and an ore fluid develops, and (3) retrograde alteration of earlier-formed mineral assemblages. Deposition of ore minerals accompanies stages 2 and 3.
The Emplacement of Zinc-Lead Sulfide Ores in the Upper ...
The Emplacement of Zinc-Lead Sulfide Ores in the Upper Silesian Distriet--A Contribution to the Understanding of Mississippi Valley-Type Deposits MARIA SASS-GUSTKIEWICZ, Academy of Mining and Metallurgy, Institute of Geology and Mineral Deposits, A l. Mickiewicza 30, 30-059 Krakow, Poland STANISLAW DZULYNSKI,
Lead isotope study on hydrothermal sulfide mineralisation ...
(1996). Lead isotope study on hydrothermal sulfide mineralisation in the Willyama Supergroup, Olary Block, South Australia. Australian Journal of …
Metallogeny and lead isotopic composition of base metal ...
Small stratabound iron, copper, and zinc deposits occur in felsic to mafic tuffs and arkosic sediments. Small deposits of molybdenum, tungsten, and uranium formed during the emplacement of the younger granites. The lead isotopic compositions of sulfide trace lead from the various deposits are highly heterogeneous.
A comprehensive geological, petrological, and …
Lead, Zn, Pt, and Pd are not enriched in the pyrrhotite-rich TYPE III outer ore zone relative to the remainder of the Ovoid. -- The second manuscript integrates mineralogical data and bulk assay data to quantitatively describe and model the emplacement (including physical/mechanical controls/processes) and crystallization history of the sulfide ...
The isotopic constitution of sulphur in some stratiform ...
Sulphur isotope measurements on five Australian stratiform lead-zinc sulphide ores are presented. Each deposit is characterised by a conspicuously narrow spread of values, mean δ 34S heavier than meteoritic, average crustal, and, where sampled stratigraphically, δ 34S related to stratigraphy rather than propinquity. When considered with other deposits of the same class …
Anomalous leads and the emplacement of lead sulfide …
Anomalous leads and the emplacement of lead sulfide ores R. L. Stanton; R. L. Stanton Search for other works by this author on: GSW. Google Scholar ... suggestions have been made concerning the genesis of a certain class of lead-bearing sulfide orebody of the conformable type. Such deposits are thought to have been derived from seaboard ...