scholarly journals Targeted Geoscience Initiative 4, volcanogenic massive sulfide ore systems

2013 ◽  
Author(s):  
C A Hutton
Keyword(s):  
Massive Sulfide ◽  
Volcanogenic Massive Sulfide ◽  
Sulfide Ore

The Scott Lake deposit: a contact-metamorphosed volcanogenic massive sulfide deposit, Chibougamau area, Quebec

1990 ◽  
Vol 27 (2) ◽  
pp. 180-186 ◽  
Author(s):  
James A. Saunders ◽  
Gilles O. Allard
Keyword(s):  
Regional Metamorphism ◽  
Massive Sulfide ◽  
Contact Metamorphism ◽  
Sulfide Deposit ◽  
Massive Sulfide Deposit ◽  
Volcanogenic Massive Sulfide ◽  
Silicate Minerals ◽  
Granitoid Intrusion ◽  
Volcanogenic Massive Sulfide Deposit ◽  
Sulfide Ore

The Scott Lake volcanogenic massive sulfide deposit lies near the margin of a large, early kinematic granitoid intrusion in the vicinity of Chibougamau, Quebec. The deposit was contact metamorphosed by the intrusion, and subsequently it was metamorphosed to the greenschist facies during the Kenoran Orogeny. Pyrite, magnetite, and sphalerite are the most abundant metallic minerals, and minor amounts of chalcopyrite, pyrrhotite, and loellingite are also present. Both pyrite and magnetite locally occur as porphyroblasts up to several centimetres in diameter. Metamorphic textures developed in the massive sulfide ore appear to have formed during contact metamorphism, and they remained intact through the subsequent regional event. However, silicate minerals (biotite and possibly amphibole) that grew during contact metamorphism were largely retrograded during regional metamorphism. The presence of biotite indicates that contact metamorphism took place at 400°–500 °C. Application of the sphalerite geobarometer gives a pressure of approximately 4.5 kbar (450 MPa), which probably reflects the later regional event.

THE 3D TRANSIENT ELECTROMAGNETIC FORWARD MODELING OF VOLCANOGENIC MASSIVE SULFIDE ORE DEPOSITS

2016 ◽  
Vol 59 (6) ◽  
pp. 725-733 ◽  
Author(s):  
LI Rui-Xue ◽  
WANG He ◽  
XI Zhen-Zhu ◽  
LONG Xia ◽  
HOU Hai-Tao ◽  
...  
Keyword(s):  
Forward Modeling ◽  
Massive Sulfide ◽  
Ore Deposits ◽  
Volcanogenic Massive Sulfide ◽  
Transient Electromagnetic ◽  
Sulfide Ore

scholarly journals Elucidating the Effects of Hydrothermal Alteration on Seismic Reflectivity in the Footwall of the Lalor Volcanogenic Massive Sulfide Deposit, Snow Lake, Manitoba, Canada

Minerals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 384 ◽  
Author(s):  
Schetselaar ◽  
Bellefleur ◽  
Hunt
Keyword(s):  
Hydrothermal Alteration ◽  
Seismic Data ◽  
Acoustic Impedance ◽  
Host Rock ◽  
Massive Sulfide ◽  
Amphibolite Facies ◽  
Rock Properties ◽  
Volcanogenic Massive Sulfide ◽  
Sulfide Ore ◽  
Seismic Reflectivity

The integrated analysis of seismic rock properties, lithogeochemical data, and mineral compositional data, estimated via scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), provides insight into the effects of hydrothermal alteration on seismic reflectivity in the footwall of the Lalor volcanogenic massive sulfide (VMS) deposit, Manitoba, Canada. The effects of hydrothermal alteration on variations in acoustic impedance are secondary in magnitude and superimposed on the dominant acoustic impedance contrast between felsic and mafic volcanic protoliths. This secondary effect is due to an increase in P-wave velocity with increasing intensity of hydrothermal alteration, as measured by the Ishikawa and Carbonate-Chlorite-Pyrite alteration indices. Mixture modeling of the seismic rock properties and mineral percentages suggests that the increase in seismic velocity is due to an increase in abundance of cordierite, which is one of the diagnostic aluminum silicates for hydrothermally-altered volcanic rocks metamorphosed in the upper almandine amphibolite facies. The synthetic seismic data of a simple VMS model consisting of mafic-felsic host rock contacts, a sulfide ore lens, and a discordant hydrothermal conduit, consisting of the amphibolite-facies mineral assemblage (600 °C, 6 kbar) encountered at Lalor, show enhanced seismic reflections at conduit-host rock contacts, in comparison to its greenschist facies equivalent (350 °C, 2.5 Kbar). This zone of enhanced seismic reflectivity in the footwall of the massive sulfide ore zone is also recognized on the Lalor seismic data suggesting that high-grade terrains hosting VMS deposits possess enhanced potential for the seismic detection of their footwall hydrothermal alteration zones.

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