|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
Scientific Communications |
Geological Survey of Canada, Mineral Resources Division, 680-601 Booth Street, Ottawa, Ontario, Canada K1A 0E8
Franklin Geoscience Ltd., 24 Commanche Drive, Nepean, Ontario, Canada K2E 6E9
Corresponding author: e-mail,
agalley{at}nrcan.gc.ca
Volcanogenic massive sulfide (VMS) deposits of the Archean Sturgeon Lake district are underlain by the 2734 Ma Beidelman Bay composite tonalite-trondhjemite synvolcanic intrusion. This 20- by 2-km sill complex is comagmatic with the VMS-hosting felsic volcaniclastic strata dated at 2735 Ma. The top of the Beidelman Bay intrusion is host to weak Cu-Mo porphyry-type sulfide mineralization associated with igneous and hydrothermal breccia zones and a plagioclase-quartz and quartz-plagioclase porphyry dike swarm. It was earlier postulated that the presence of intrusion-hosted base metal mineralization indicates that the Beidelman Bay intrusion not only initiated and sustained the subsea-floor convective system responsible for the formation of the cauldron-hosted VMS deposits but may also have supplied metals to the fluid system.
New U/Pb zircon analyses of a plagioclase-quartz porphyry dike overprinted by the Cu-Mo mineralization resulted in a date of 2720.5–3.0+3.5 Ma, approximately 14 m.y. younger than the host biotite trondhjemite phase of the Beidelman Bay intrusion. Rare earth and trace element concentrations differ greatly between the porphyry dike and the tonalite and trondhjemite phases of the Beidelman Bay intrusion but are similar in composition to a 2717.9–1.5+2.9 Ma postcauldron rhyolite tuff unit. This demonstrates that the porphyry-type mineralization hosted within the Beidelman Bay synvolcanic intrusion is unrelated to the VMS hydrothermal system and is most likely related to later, more evolved oceanic arc magmatism.
This article has been cited by other articles:
|
|
 |
|
  S. J. Piercey, E. C. Chaloux, A. S. Peloquin, M. A. Hamilton, and R. A. Creaser Synvolcanic and Younger Plutonic Rocks from the Blake River Group: Implications for Regional Metallogenesis Economic Geology, September 1, 2008; 103(6): 1243 - 1268. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. J. Piercey, J. M. Peter, J. K. Mortensen, S. Paradis, D. C. Murphy, and T. L. Tucker Petrology and U-Pb Geochronology of Footwall Porphyritic Rhyolites from the Wolverine Volcanogenic Massive Sulfide Deposit, Yukon, Canada: Implications for the Genesis of Massive Sulfide Deposits in Continental Margin Environments Economic Geology, January 1, 2008; 103(1): 5 - 33. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. E. Ioannou and E. T. C. Spooner Fracture Analysis of a Volcanogenic Massive Sulfide-Related Hydrothermal Cracking Zone, Upper Bell River Complex, Matagami, Quebec: Application of Permeability Tensor Theory Economic Geology, June 1, 2007; 102(4): 667 - 690. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. E. Ioannou, E. T. C. Spooner, and C. T. Barrie Fluid Temperature and Salinity Characteristics of the Matagami Volcanogenic Massive Sulfide District, Quebec Economic Geology, June 1, 2007; 102(4): 691 - 715. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T. R. Hart, H. L. Gibson, and C. M. Lesher TRACE ELEMENT GEOCHEMISTRY AND PETROGENESIS OF FELSIC VOLCANIC ROCKS ASSOCIATED WITH VOLCANOGENIC MASSIVE Cu-Zn-Pb SULFIDE DEPOSITS Economic Geology, August 1, 2004; 99(5): 1003 - 1013. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. R. Nedimovic, M. R. Nedimovic, and G. F. West Shallow Three-Dimensional Structure from Two-Dimensional Crooked Line Seismic Reflection Data over the Sturgeon Lake Volcanic Complex Economic Geology, December 1, 2002; 97(8): 1779 - 1794. [Abstract] [Full Text] [PDF]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
