Resedimented conglomerates of Huronian (lower Aphebian) age, from the north shore of Lake Huron, Ontario, Canada

1977 ◽  
Vol 14 (11) ◽  
pp. 2495-2509 ◽  
Author(s):  
Darrel G. F. Long
Keyword(s):  
Matrix Material ◽  
Lake Huron ◽  
Fault System ◽  
North Shore ◽  
The North ◽  
Sediment Gravity Flows ◽  
Gravity Flows

Conglomeratic rocks are present near the top of a dominantly arenaceous sequence, previously ascribed entirely to the Huronian Mississagi Formation, in a belt extending for about 60 km east of Blind River, on the north shore of Lake Huron. These conglomeratic rocks and the massive and planar laminated sandstones which overlie them are herein named the Lauzon member, after the thickest exposed development of the sequence at Lauzon Lake in Striker Township. The presence of dropstones in the sequence at Lauzon Lake suggests that the member is best considered as part of the Bruce Formation. Conglomeratic rocks within the Lauzon member include granule-supported boulder, cobble, and pebble conglomerate; sand-supported cobble and pebble conglomerate; intact framework graded and non-graded pebble and cobble conglomerates; stratified conglomerates and conglomeratic sandstones; and disrupt framework conglomerates. These conglomeratic rocks lack abundant mud-grade matrix material and, hence, are readily distinguished from (glaciogenic?) mixtites of the Ramsay Lake, Bruce, and Gowganda Formations. Conglomerates of the Lauzon member were probably deposited from sediment gravity flows within a series of subaqueous fans or fan head valleys which may have been initiated by contemporaneous movements along a precursor to the Murray Fault system at the onset of the Bruce glaciation.

HURONIAN STRATIGRAPHY OF THE McGREGOR BAY AREA, ONTARIO: RELEVANCE TO THE PALEOGEOGRAPHY OF THE LAKE SUPERIOR REGION

1966 ◽  
Vol 3 (2) ◽  
pp. 203-210 ◽  
Author(s):  
Grant M. Young
Keyword(s):  
United States ◽  
Lake Superior ◽  
Lake Huron ◽  
North Central ◽  
North Shore ◽  
Bay Area ◽  
The North ◽  
Central United States ◽  
Iron Formations

Mapping in the McGregor Bay area of Ontario has shown the presence of a sequence of formations which closely resembles that of the original Huronian of the Bruce Mines–Blind River area. Iron-rich siltstones and argillites above the Lorrain formation are correlated with the lower part of the Animikie iron-formations of the Port Arthur region of Lake Superior and the north central United States. The oldest Proterozoic rocks of the region south of Lake Superior are considered to be correlatives of the Cobalt group of the north shore of Lake Huron.

Lower Huronian Sandstones; Correlation Problems and Uranium; Morin Township Area, Ontario

1975 ◽  
Vol 12 (2) ◽  
pp. 237-251
Author(s):  
F. W. Chandler
Keyword(s):  
Lake Huron ◽  
North Shore ◽  
The North ◽  
Stratigraphic Subdivision ◽  
Lake Formation ◽  
Stratigraphic Position

Huronian feldspathic sandstones 30 km north of Thessalon (the Morin Township area) rest noncomformably upon Archean rocks and are overlain by the Huronian Gowganda Formation. They contain uraniferous pyritic quartz-pebble orthoconglomerate, similar to the uraniferous conglomerate ore of the Elliot Lake – Blind River area. The sandstones also contain paraconglomerate units at several stratigraphic levels which are lithologically similar to the Ramsay Lake and Bruce Formations.Trends in Huronian stratigraphy on the North Shore of Lake Huron suggest that in the Morin Township area the Quirke Lake Group is absent and the McKim and Pecors Formations, which contain much argillite, are likely to be very thin or absent. Thus the feldspathic sandstones of the Morin Township area are assigned to the Matinenda and the Mississagi Formations. The most continuous paraconglomerate unit might be correlated with the Ramsay Lake Formation.Huronian feldspathic sandstones lying nonconformably upon Archean rocks 16 km northeast of Sault Ste Marie (the 'Soo Series') and 50 km north of Sudbury, have many features in common with the sequence of the Morin Township area. Stratigraphic subdivision of these two sequences and finer delimitation of potential uraniferous units may be aided by using paraconglomerates such as the Ramsay Lake Formation as marker units. Such subdivision however will be uncertain until the number, exact stratigraphic position and the areal continuity of these paraconglomerates can be assessed better.

scholarly journals Copper deposits and occurrences in the north shore region of Lake Huron, Ontario

1985 ◽  
Author(s):  
W N Pearson ◽  
R E Bretzlaff ◽  
J J Carrière ◽  
Keyword(s):  
Lake Huron ◽  
Copper Deposits ◽  
North Shore ◽  
The North

PODZOL DEVELOPMENT NORTH OF LAKE HURON IN RELATION TO GEOLOGY AND VEGETATION

1980 ◽  
Vol 60 (3) ◽  
pp. 527-539 ◽  
Author(s):  
L. J. EVANS
Keyword(s):  
Phenolic Acids ◽  
Internal Standard ◽  
Soil Surface ◽  
Lake Huron ◽  
Soil Morphology ◽  
Water Extracts ◽  
North Shore ◽  
The North ◽  
Northerly Direction ◽  
Morphological Expression

The morphological expression of podzolization in four Humo-Ferric Podzols increased in a northerly direction over a distance of approximately 74 km from the north shore of Lake Huron. The transect coincided with changes in both geology and vegetation. All the soils were developed in coarse-textured acid tills whose composition was not significantly different to explain the observed variations in soil morphology. Using quartz as an internal standard, the order of mobility from surface horizons was found to be Mg > Fe = Ca > Na = Al > K > Ti. Pyroxenes, amphiboles, chlorite and albite were the most easily weathered minerals. Protocatechuic, p-coumaric, gentisic and gallic acids were found to be the major phenolic acids in water extracts of soil surface horizons. The content of both phenolic acids and carbohydrates in surface horizons increased as the morphological expression of podzolization increased.

Ages of Lamprophyre Dikes and of the Mongowin Pluton, North Shore of Lake Huron, Ontario, Canada

1971 ◽  
Vol 8 (10) ◽  
pp. 1203-1209 ◽  
Author(s):  
W. R. Van Schmus
Keyword(s):  
Lake Huron ◽  
North Shore ◽  
The North ◽  
Area Data

Rb–Sr analyses have been carried out on samples of lamprophyre dikes and of granophyric phases of the Mongowin Pluton, two units that intrude Huronian metasediments in the Espanola–Massey area. Data on whole rocks and separated biotites from the lamprophyres yield an isochron age of 1415 ± 40 m.y., which is interpreted as the age of intrusion of the lamprophyre dikes. Whole rock granophyric samples from the Mongowin Pluton do not define a good isochron, but an "age" of 1770 ± 75 m.y. may be inferred from the data; the possibility exists, however, that the true age may be younger or older. The lamprophyre dikes and the Mongowin Pluton are apparently unrelated to each other; furthermore, neither unit appears to be the same age as the 1510 ± 50 m.y. old Croker Island Complex. Thus, there is little evidence to suggest that there was a major intrusive 'event' approximately 1500 m.y. ago in the north shore area; instead, it appears that diverse igneous and metamorphic activity occurred at several scattered times during the interval 1200 m.y. to 1800 m.y. ago.

Downward Intrusive Breccias in the Huronian Espanola Formation, Ontario, Canada

1972 ◽  
Vol 9 (6) ◽  
pp. 756-762 ◽  
Author(s):  
Grant M. Young
Keyword(s):  
Lake Huron ◽  
Pressure Release ◽  
North Shore ◽  
The North ◽  
Pore Pressures ◽  
Sudden Release ◽  
Water Saturated ◽  
Tectonic Movements

Some breccias in the early Aphebian Espanola Formation of the north shore of Lake Huron apparently formed by downward injection caused by sudden release of high pore pressures in water saturated sediments. Pressure release was effected by movement of sediment-water mixtures into fissures formed in the Espanola Formation by early (probably pre-Gowganda) tectonic movements.

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