scholarly journals Magmatic Sulfide Ore Deposits

Elements ◽  
2017 ◽  
Vol 13 (2) ◽  
pp. 89-95 ◽  
Author(s):  
Stephen J. Barnes ◽  
David A. Holwell ◽  
Margaux Le Vaillant
Keyword(s):  
Ore Deposits ◽  
Sulfide Ore ◽  
Magmatic Sulfide

scholarly journals Procedure for risk assessment of initiation and progression of oxidation processes during development of pyrite ore deposits

2020 ◽  
Vol 192 ◽  
pp. 03005
Author(s):  
Gennady Einbinder ◽  
Natalia Mitishova ◽  
Dmitry Radchenko ◽  
Egor Knyazkin
Keyword(s):  
Risk Assessment ◽  
Hazard Analysis ◽  
Ore Deposits ◽  
Industrial Safety ◽  
Accident Risk ◽  
Hazard Degree ◽  
Increased Risk ◽  
Sulfide Ore ◽  
Hazardous Production

In the modern conditions, the scale of subsoil transformation in the process of mineral extraction is characterized by an increased risk of accidents, often accompanied by man-made disasters. In this regard, hazard analysis and accident risk assessment is the most important scientific and technical task, the solution of which is based on methods for identification of hazards, study of development trends and assessment of consequences of theoretically possible accidents. In relation to development conditions of sulfide ore deposits, only an accident risk assessment with determination of the possible accident hazard degree, as well as preparation and timely correction of measures aimed at reduction of accident risks can ensure an acceptable level of industrial safety at the hazardous production facility.

Performance of low-fold scalar migration for downhole seismic imaging of massive sulfide ore deposits at Norman West, Sudbury, Canada

Geophysics ◽  
2012 ◽  
Vol 77 (5) ◽  
pp. WC3-WC13 ◽  
Author(s):  
Christof Mueller ◽  
Gilles Bellefleur ◽  
Erick Adam ◽  
Gervais Perron ◽  
Marko Mah ◽  
...  
Keyword(s):  
Seismic Data ◽  
Seismic Imaging ◽  
Signal To Noise Ratio ◽  
Massive Sulfide ◽  
Ore Deposits ◽  
Ore Deposit ◽  
Seismic Scattering ◽  
Vertical Seismic Profiling ◽  
Sudbury Igneous Complex ◽  
Sulfide Ore

The Downhole Seismic Imaging consortium conducted two consecutive vertical seismic profiling surveys in the Norman West mining camp (Sudbury, Canada) in 1998 and 1999. These were aimed toward imaging a massive sulfide ore deposit situated within the footwall of the Sudbury Igneous Complex (SIC). Three-component seismic data were acquired in four boreholes with variable signal-to-noise ratio and poor polarization quality. Consequently, the images suffered from strong azimuthal ambiguity. A strike filter, passing only reflections originating from within the SIC, was applied during migration to enhance interpretability of the images obtained. Migrated images showed structures correlating with the known position of an ore deposit located 1800 m away from one borehole (N40). Diffraction coherency migration enhanced the image of the deposit, and suggested strong seismic scattering from within the footwall of the SIC.

Petrogenetic significance of chromian spinels from the Sudbury Ignecus Complex, Ontario, Canada

1997 ◽  
Vol 34 (10) ◽  
pp. 1405-1419 ◽  
Author(s):  
Mei-Fu Zhou ◽  
Reid R. Keays ◽  
Peter C. Lightfoot ◽  
Gordon G. Morrison ◽  
Michelle L. Moore
Keyword(s):  
Magma Mixing ◽  
Ore Deposits ◽  
Chromian Spinel ◽  
Triangular Diagram ◽  
Element Abundances ◽  
Sudbury Igneous Complex ◽  
Magmatic Sulfides ◽  
Sulfide Ore ◽  
Host Rocks ◽  
Chamber Floor

Chromian spinels occur in mafic–ultramafic inclusions in the Sublayer of the Sudbury Igneous Complex (SIC) as well as in mafic–ultramafic rocks in the immediate footwall of the Sublayer. The host rocks are pyroxenite and melanorite with minor dunite, harzburgite, and melatroctolite. As common accessory phases in these rocks, the chromian spinels display euhedral or subhedral forms and are included in olivine and orthopyroxene. Chromian spinel grains generally have ilmenite lamellae and contain abundant inclusions (zircon, olivine, diopside, plagioclase, biotite, and sulfide). All the chromian spinels have similar trace element abundances and are rich in TiO2 (0.5–15 wt.%). They have constant Cr# (100Cr/(Cr + Al)) (55–70) and exhibit a continuum in composition that traverses the normal fields of spinels in a Al–(Fe3+ + 2Ti)–Cr triangular diagram. This continuum extends to that of the composition of chromian magnetite in the host norite matrix to the mafic–ultramafic inclusions. This continuum in composition of the spinels suggests that the noritic matrix to the Sublayer formed from the same magma as the inclusions. A positive correlation between the Cr and Al contents of the spinels was probably produced by dilution of these elements by Fe3+ contributed, perhaps, by a plagioclase-saturated melt. Zircon inclusions in a chromian spinel grain reflect incorporation of crustal, felsic materials into the magma before crystallization of chromian spinel. The chemical characteristics and mineral inclusions of the spinels suggest that the Sublayer formed in response to magma mixing. It is suggested that subsequent to the formation of the crustal melt, mantle-derived high-Mg magmas mixed vigourously with this and generated the magmatic sulfides that eventually formed the Ni – Cu – platinum-group elements sulfide ore deposits. Some of the early crystallization products of the high-Mg magma settled to the chamber floor, where they partially mixed with the crustal melt and formed the mafic–ultramafic inclusions and footwall complexes.

The Ni-Cu-PGE-(Au-Te) potential of the Permo-Triassic boundary between Laurasia and Gondwana

2021 ◽  
Author(s):  
Marco Fiorentini ◽  
David Holwell ◽  
Marilena Moroni ◽  
Steve Denyszyn ◽  
Daryl Blanks ◽  
...  
Keyword(s):  
Parental Magma ◽  
Search Space ◽  
Sulfide Mineral ◽  
Ore Deposits ◽  
Time Interval ◽  
Moderate Pressure ◽  
Triassic Boundary ◽  
North West ◽  
Ivrea Zone ◽  
Magmatic Sulfide

<p>The long-lived geodynamic evolution of the Permo-Triassic boundary between <span>Laurasia</span> and Gondwana may have created the ideal conditions for the genesis of a trans-continental Ni-Cu-PGE-(Au-Te) mineralised belt in Europe. This working hypothesis stems from the recent understanding that orogenic processes play a fundamental role in the onset of chemical and physical triggers for the transport of metals from the metasomatised mantle through to various crustal levels. An insight into our renewed framework for the polyphased genetic evolution of magmatic sulfide mineral systems is provided by a series of mineralised occurrences in the Ivrea Zone of NW Italy, which formed at multiple stages over a > 80 Ma time interval. Between 290-250 Ma, a series of hydrated and carbonated ultramafic alkaline pipes containing Ni-Cu-PGE-(Te-Au) mineralisation was emplaced in the lower continental crust. At ~200 Ma, a subsequent mineralising event occurred in association with the emplacement of the La Balma-Monte Capio (LBMC) intrusion. Modelling of the LBMC parental magma shows derivation from ~30% partial melting of an anhydrous juvenile mantle at moderate pressure (< 7 GPa). The inferred composition of the parental melt is consistent with magmatism associated with the Central Atlantic Magmatic Province (CAMP). However, its tellurium-enriched composition together with the S-C-O isotope signature of the associated magmatic sulfide mineralisation cannot be reconciled with the CAMP source. It is argued that the geochemical and isotopic signature of the LBMC intrusion reflects interaction and mixing of a primitive magma sourced from a juvenile source with localised domains enriched in carbonate and metal-rich sulfides located in the lower crust, consistent with the composition of the Permo-Triassic pipes. Evidence of this magmatic interaction informs on the first-order processes that control enhanced metallogenic fertility along the margins of lithospheric blocks. The scenario depicted here is consistent with reactivation and enrichment of a Gondwana margin Ni-Cu-PGE-(Te-Au) mineral system during the breakup of Pangea. The lessons learnt in the Ivrea Zone natural laboratory may inform on the genesis of other Permo-Triassic magmatic mineral systems in continental Europe, such as the deposits in north-west Czech Republic and southern Spain, which display significant analogies with their counterparts in the Ivrea Zone. We suggest that these systems may have a common DNA related to a metallogenic belt forming at different stages during the complex evolution and multi-phase activation of the margin between <span>Laurasia</span> and Gondwana. The nature and localisation of the magmatic sulfide mineral systems along this belt indicate that enhanced potential for ore formation at lithospheric margins may be due not only to favourable architecture, but also to localised enhanced metal and volatile fertility. Importantly, this hypothesis may explain why ore deposits along the margins of lithospheric blocks are not distributed homogeneously along their entire extension but generally form clusters. As mineral exploration is essentially a search space reduction exercise, this new understanding may prove to be important in predictive exploration targeting for new mineralised camps in Europe and elsewhere globally, as it provides a way to prioritise segments with enhanced fertility along extensive lithospheric block margins.</p>

Temperatures and depth of formation of sulfide ore deposits at Gilman, Colorado

1958 ◽  
Vol 53 (6) ◽  
pp. 689-707 ◽  
Author(s):  
Tom Gray Lovering
Keyword(s):  
Ore Deposits ◽  
Sulfide Ore

Genesis of sulfide ore deposits in relation to isotopic composition of their sulfur

1969 ◽  
Vol 11 (6) ◽  
pp. 685-690
Author(s):  
G.M. Gapeyeva ◽  
N.I. Pokvaya
Keyword(s):  
Isotopic Composition ◽  
Ore Deposits ◽  
Sulfide Ore

scholarly journals Secondary Alteration of Sulfide Ore Deposits

1967 ◽  
Vol 88 (12) ◽  
pp. 1241-1250
Author(s):  
Masami ICHIKUNI
Keyword(s):  
Ore Deposits ◽  
Secondary Alteration ◽  
Sulfide Ore
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