Archean and Proterozoic geology of the Thunder Bay and Atikokan area, Ontario
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Archean and Proterozoic geology of the Thunder Bay and Atikokan area, Ontario

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Published by International Geological Congress in Montreal .
Written in English

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Open LibraryOL22013597M

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rocks in the eastern part of the area. Middle Proterozoic rhyo- lite-granite complexes overlap these terranes to the south. Ano- rogenic granite (~ Ga) bodies of the Transcontinental Proterozoic province intrude older rocks in a belt extending from Wyoming northeastward to Lake Huron. The two Archean cratons, the Superior and WyomingCited by: Archean and Proterozoic geology of the Lake Superior region, U.S.A., Series title: Professional Paper: Series number: DOI: /pp Edition-Year Published: Language: ENGLISH: Description: p. Google Analytic Metrics: Metrics page: Additional metadata about this publication, not found in other parts of the page is in. Archean Geology: - 4 b.y. - no geologic record on Earth - sometimes called the Hadean Eon - Earth formed about b.y. (most meteorites and oldest moon rocks are of this age, though there are no surviving rocks from Earth of this age). The Archean-Proterozoic transition was among the most important in geological history for it includes evidence of establishment of ‘modern-style’ plate tectonics, unprecedented paleoclimatic upheavals, and oxygenation of the atmosphere. The early Paleoproterozoic sedimentary record includes evidence of the world's first widespread glacial.

Close mobile search navigation. Article navigation. Vol Number Map , Atikokan-Lakehead Sheet of O.G.S. Geological Compilation Series, scale l inch to 4 miles, shows the Magone Lake and north area to be underlain by Archean-aged metasediments and gneisses and south of this area is underlain by the Penassen Lakes granite, also Archean-. Fabric of Archean Turbidites of the Hazelwood Lake Area, Thunder Bay, Ontario: Lakehead University: Regional: Hard copy: TB The Gold Deposits of the Atikokan Area, Ontario: University of Toronto: Stratigraphic: TB Geology of an Archean Intrusive Clastic Dike in the McVicar Lake Area of Ontario: -Archean cratons assembled via collisions of island arcs and minicontinents-accretion of these continents accured during the proterozoic at the craton margins, forming much larger landmasses. -happened more rapidly back then because the Earth was hotter.

In Ontario, large quantities of amethyst formed during the faulting of the Lake Superior Basin, between layers of Archean and Proterozoic rocks. This process occurred before the glaciations of the Great Lakes ba to 10, years ago, which depressed the land surface, scooped out thousands of lake basins, and carried away much of the.   Precambrian Research, 46 (): Elsevier Science Publishers B.V., Amsterdam -- Printed in The Netherlands The Archean-Proterozoic Boundary in the Kaapvaal Province of Southern Africa ERIC S. CHENEY*, C. ROERING and H. de la R. WINTER Department of Geology, Rand Afrikaans University, P.O. Box , Johannesburg, (South Africa) (Received March 2, . Thunder Bay, ON: M. Bartley, E. Mercy: Program, Abstracts, and Guidebooks: In P&A volume 1. Proterozoic formations in the Thunder Bay area 2. Sturgeon River metavolcanic-metasedimentary formations in the Beardmore-Geraldton area 3. The Port Coldwell alkalic complex 4. Geology of the Atikokan area: Duluth, MN: Don Davidson: Program. An impact origin for the Sudbury structure in Ontario has long been accepted, but knowledge of the corresponding ejecta was limited to fall-back breccia in the relict crater at Sudbury. The more distant ejecta blanket was discovered only recently near Thunder Bay, Ontario, and later in other parts of the Lake Superior region.