Magmatic sulfide-rich nickel-copper deposits related to picrite and (or) tholeiitic basalt dike-sill complexes-A preliminary deposit model

2010 ◽  
Author(s):  
Klaus J. Schulz ◽  
Val W. Chandler ◽  
Suzanne W. Nicholson ◽  
Nadine M. Piatak ◽  
Robert R. Seal ◽  
...  
Keyword(s):  
Tholeiitic Basalt ◽  
Copper Deposits ◽  
Nickel Copper ◽  
Magmatic Sulfide ◽  
Deposit Model ◽  
Basalt Dike

Geochemical exploration for concealed nickel-copper deposits

1995 ◽  
Vol 55 (1-3) ◽  
pp. 309-320 ◽  
Author(s):  
Yinggui Li ◽  
Hangxin Cheng ◽  
Xuedong Yu ◽  
Waisheng Xu
Keyword(s):  
Geochemical Exploration ◽  
Copper Deposits ◽  
Nickel Copper

Intergrowths of hexagonal and monoclinic pyrrhotites in some sulphide ores from norway

1996 ◽  
Vol 60 (399) ◽  
pp. 303-316 ◽  
Author(s):  
Gu Lianxing ◽  
Frank M. Vokes
Keyword(s):  
Grain Boundaries ◽  
Massive Sulphide ◽  
Hydrothermal Solutions ◽  
Copper Deposits ◽  
Anisotropic Stress ◽  
Sulphide Ores ◽  
Nickel Copper ◽  
Lamella Thickness ◽  
Monoclinic Pyrrhotite ◽  
Hexagonal Pyrrhotite

AbstractPyrrhotites in polished sections from more than twenty stratabound massive sulphide and magmatic nickel-copper deposits in Norway were studied under the microscope using the magnetic colloid method. In both types of deposits, two distinct styles of intergrowths between monoclinic and hexagonal pyrrhotites were found: crystallographically-controlled lamellar intergrowths and fissure-controlled irregular intergrowths.Lamellar intergrowths consist of crystallographically oriented monoclinic lamellae occurring in a hexagonal matrix and were produced originally by exsolution from hexagonal pyrrhotite on cooling. Irregular intergrowths comprise blades and patches of monoclinic pyrrhotite occurring along fissures and grain boundaries of hexagonal pyrrhotite, and were formed by interactions between hexagonal grains and sulphur-rich hydrothermal solutions.Increase in lamella thickness and spacing, development of lamella zonations, wedge-shaped composite ends, boxworks and composite lamellae were caused by progressive lamellae coarsening and maturation during natural annealing, which could have been promoted by anisotropic stress. Metamorphic recrystallization and annealing tend to homogenize pyrrhotite and erase preexisting exsolution lamellae.

Magnetic exploration of the nickel-copper deposits of Bohemia Basin, southeastern Alaska

1945 ◽  
Vol 40 (7) ◽  
pp. 496-502
Author(s):  
Matt Savage Walton ◽  
George Clayton Kennedy
Keyword(s):  
Copper Deposits ◽  
Nickel Copper
Sign in / Sign up

Export Citation Format

Share Document