Age Relationships of Intrusive Rocks and Ore Deposits in the Red Lake Area, Ontario

1943 ◽  
Vol 51 (1) ◽  
pp. 17-32 ◽  
Author(s):  
H. C. Horwood ◽  
N. B. Keevil
Keyword(s):  
Ore Deposits ◽  
Lake Area ◽  
Red Lake ◽  
Intrusive Rocks

INTRUSIVE ROCKS OF THE GAME LAKE AREA AND IMPLICATIONS FOR THE ORIGIN OF THE SNOWCAMP OPHIOLITE

2017 ◽  
Author(s):  
Brittany M. DePasquale ◽  
◽  
Nuredin Kozenjic ◽  
Adam Schoonmaker
Keyword(s):  
Lake Area ◽  
Intrusive Rocks

Lead- and sulfur-isotope ratios from the Great Slave Lake area, Canada

1968 ◽  
Vol 5 (5) ◽  
pp. 1269-1276 ◽  
Author(s):  
D. K. Robertson ◽  
G. L. Cumming
Keyword(s):  
Lead Isotope ◽  
Sulfur Isotope ◽  
Isotope Ratios ◽  
Ore Deposits ◽  
Lake Area ◽  
Iron Sulfides ◽  
Tectonic Event ◽  
Slave Province ◽  
Great Slave Lake ◽  
Lead Line

Lead- and sulfur-isotope ratios have been determined for some galenas and iron sulfides from two regions around Yellowknife, Northwest Territories. For the ore deposits, sulfur-isotope ratios are close to the meteoritic value or slightly positive. Lead-isotope ratios fall into two groups, one derived from a source with Th/U = 4.3 and μ = 9–11, and the other from a source with Th/U = 3.5 and μ = 9.0. The ratios fall on an anomalous lead line, which indicates one event of great antiquity (approximately 4000 m.y.), and another about 2800 m.y. ago.Other sulfide samples from areas around Great Slave Lake, primarily outside the ancient (2800 m.y.) Slave Province, indicate events at 2800 m.y. and 1550 m.y., the latter date probably representing the time of the last major tectonic event in the Slave Province. Sulfur-isotope ratios for these samples vary from +1‰ to −13‰ relative to the meteoritic value, suggesting that these leads may have been remobilized by thermal metamorphism, and recombined with crustal sulfur enriched in 32S.

ARCHAEAN SEDIMENTARY ROCKS OF NORTH SPIRIT LAKE AREA, NORTHWESTERN ONTARIO

1965 ◽  
Vol 2 (6) ◽  
pp. 622-647 ◽  
Author(s):  
J. A. Donaldson ◽  
G. D. Jackson
Keyword(s):  
Volcanic Rocks ◽  
Sedimentary Rocks ◽  
Sole Source ◽  
Lake Area ◽  
Red Lake ◽  
Sedimentary Sequences ◽  
The North ◽  
Northwestern Ontario ◽  
History Of ◽  
Granitoid Rocks

Archaean sedimentary rocks of the North Spirit Lake area show little evidence of having been derived predominantly from associated Archaean volcanic rocks. Instead, compositions of the sediments reflect significant sedimentary and (or) granitoid provenance. A remarkably high content of clastic quartz in thick units of sandstone and conglomerate suggests either reworking of older quartzose sediments, or reduction of the labile constituents in quartz-rich granitoid rocks through prolonged weathering and rigorous transport. Observations for other sedimentary sequences in the region between Red Lake and Lansdowne House suggest that the North Spirit sediments are not unique in the Superior Province. Quartzose sandstones commonly are regarded as atypical of the Archaean, but such rocks arc abundant in northwestern Ontario. Frameworks of many Archaean greywackes actually are richer in quartz than typical greywackes from numerous Proterozoic and Phanerozoic sequences.The concept of rapidly rising volcanic arcs as the sole source of Archaean sedimentary detritus is rejected for the North Spirit area. The volcanies, rather than representing relicts of protocontinents, probably record events removed from initial volcanism in the history of the earth by one or more orogenic cycles. Major unconformities may therefore exist not only between sedimentary and volcanic units, but also between these units and older granitoid rocks.

scholarly journals Surfical geology of the Red Lake-Confederation Lake area, Ontario

1999 ◽  
Author(s):  
H A J Russell ◽  
D R Sharpe ◽  
P Stacey
Keyword(s):  
Lake Area ◽  
Red Lake

scholarly journals Mineralogical study of a low-grade nickel ore from the Red Lake area in Ontario for W.D. Sutherland of Blind River, Ontario

1967 ◽  
Author(s):  
W Petruk ◽  
D C Harris ◽  
R W Buckmaster ◽  
H R Lauder ◽  
R S Kobus
Keyword(s):  
Low Grade ◽  
Lake Area ◽  
Red Lake ◽  
Mineralogical Study
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