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

scholarly journals "Mineralogical & Petrographic Microfacies Study of the Zahraa formation (Pliocene– Pleistocene) in Sawa Lake Surrounding area- IRAQ "

2017 ◽  
Vol 4 (1) ◽  
pp. 11-20
Author(s):  
Saleh A. Lazam
Keyword(s):  
Organic Matter ◽  
Fresh Water ◽  
Depositional Environment ◽  
Water Environment ◽  
Lake Area ◽  
Surrounding Area ◽  
Thin Sections ◽  
Project Area ◽  
Mineralogical Study ◽  
Fresh Water Environment

"Mineralogical, Petorographic Microfacies study has been done on (16) samples of Zahraa formation (Pliocene – Pleistocene) of outcrop in Surrounded Sawa Lake area. The mineralogical study showed that Calcite is the main mineral within the rock formation, whereas the upper rocks of Zahraa Formation consist silty or sandy claystone is dominant in the middle and the upper portion, in addition to quartz, clay minerals, iron oxide and organic matter as insoluble residues. From thin sections study, Three main microfacies have been identified which are: Charophyte shelly bioclastic wackestone, Charophyte shelly bioclastic dolowackestone and Algal wackestone. Based on microfacies study and its fossils content, it has been possible to determine the depositional environment of Zahraa Formation which deposits in the area of the presence of Charaphytes, indicates fresh water environment. From the depositioal situation and the large extension in the project area, the type of fresh water environment is ephemeral freshen water lakes."

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

Regional implications of Upper Triassic metavolcanic and metasedimentary rocks on the Chilkat Peninsula, southeastern Alaska

1980 ◽  
Vol 17 (6) ◽  
pp. 681-689 ◽  
Author(s):  
George Plafker ◽  
Travis Hudson
Keyword(s):  
British Columbia ◽  
Volcanic Rocks ◽  
Upper Triassic ◽  
Late Triassic ◽  
Low Grade ◽  
Lake Area ◽  
Metasedimentary Rocks

A low-grade metamorphic sequence consisting of thick mafic volcanic rocks overlain by calcareous flysch with very minor limestone underlies much of the Chilkat Peninsula. Fossils collected from both units are of Triassic age, probably late Karnian. This sequence appears to be part of the Taku terrane, a linear tectono-stratigraphic belt that now can be traced for almost 700 km through southeastern Alaska to the Kelsall Lake area of British Columbia. The age and gross lithology of the Chilkat Peninsula sequence are comparable to Upper Triassic rocks that characterize the allochthonous tectono-stratigraphic terrane named Wrangellia. This suggests either that the two terranes are related in their history or that they are allochthonous with respect to one another and coincidentally evolved somewhat similar sequences in Late Triassic time.

U–Pb zircon and sphene geochronology of a composite Archean granitoid batholith, Favourable Lake area, northwestern Ontario

1985 ◽  
Vol 22 (10) ◽  
pp. 1436-1451 ◽  
Author(s):  
F. Corfu ◽  
T. E. Krogh ◽  
L. D. Ayres
Keyword(s):  
Late Stage ◽  
Temporal Correlation ◽  
Primary Crystallization ◽  
Low Grade ◽  
Lake Area ◽  
Near Surface ◽  
Chemical Alteration ◽  
Northwestern Ontario ◽  
Two Samples ◽  
Multiple Stages

U–Pb zircon and sphene data for several phases of composite batholiths in the Favourable Lake area of the Superior Province indicate two major periods of plutonism separated by a hiatus of over 200 Ma.A trondhjemite, which now forms a metamorphosed remnant within a batholith, was emplaced 2950 ± 5 Ma ago during an early plutonic event. The second and dominant plutonic period occurred between [Formula: see text] and 2711.0 ± 2.0 Ma ago; these are the ages of the earliest and the latest widespread phase of the batholiths, respectively. Ages of 2716.3 ± 1.4 and 2716 ± 4 Ma for zircons of two minor dioritic phases also fall within this interval. Metamorphic zircons about 2730 and 2715 Ma old from another unit of the batholith indicate a temporal correlation between metamorphism and main plutonic pulses.Sphenes from two samples near the margins of the batholiths yield the same age of 2711 ± 2 Ma as coexisting zircons and date the primary crystallization of the rocks. In contrast, sphenes from six samples from the interior of a batholith yield ages of 2680 ± 10 Ma, which are significantly younger than primary ages of 2950–2716 Ma of coexisting zircons. These sphene ages probably record cooling below about 500 °C during a long and complex cooling process.Several of the studied zircon populations exhibit complex discordance patterns reflecting multiple stages of Pb loss. Zircons in rocks predating the 2700–2730 Ma old metamorphic–plutonic event experienced Pb loss during this event, probably by annealing. A second low-grade event apparently caused chemical alteration of high-U zircon domains and Pb loss about 1750 Ma ago. A late stage of Pb loss affected near-surface zircon domains about 600–0 Ma ago.

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

GEOPHYSICAL CASE HISTORIES OF DISSEMINATED SULFIDE DEPOSITS IN BRITISH COLUMBIA

Geophysics ◽  
1972 ◽  
Vol 37 (1) ◽  
pp. 142-159 ◽  
Author(s):  
David K. Fountain
Keyword(s):  
British Columbia ◽  
Geophysical Methods ◽  
Mining Industry ◽  
Forest Growth ◽  
Low Grade ◽  
Lake Area ◽  
Sulfide Deposits ◽  
Economic Significance ◽  
Total Sulfide ◽  
Sulfide Content

The growth of the mining industry in British Columbia in recent years has been mainly due to the development of large low‐grade disseminated sulfide deposits. The two problems faced by the geophysicist in the exploration for deposits of this nature are the difficulty of, one, detecting large volumes of rock containing a low‐percentage content of total sulfide mineralization and, two, obtaining some idea of the economic significance of the mineralization. Although the standard geophysical methods used in the search for disseminated sulfide deposits have been successfully applied, there are some aspects of the British Columbia deposits which create additional problems for the geophysicist. As illustrated by the Brenda, Valley Copper, and Lornex deposits, the lack of appreciable pyrite associated with the economic mineralization results in a low total sulfide content; this in turn makes it difficult to obtain a diagnostic anomalous geophysical response. Because of the rugged terrain and generally heavy forest growth, the more powerful geophysical methods, such as induced polarization, are high‐cost techniques. However, alteration and fracturing associated with the disseminated mineralization (Babine Lake area) may lower the overall resistivity of a deposit sufficiently to allow detection with electromagnetic (EM) methods. Although limited in application, the lower cost of EM methods in many situations renders their use practical, especially if airborne techniques can be employed.

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