Correlation of Precambrian Rocks of the Lake Superior Region, United States PDF Download
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Author: G. B. Morey
Publisher:
ISBN:
Category : Geology, Stratigraphic
Languages : en
Pages : 42
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Book Description
Lithology, distribution, correlation, and isotope ages of exposed Precambrian rocks in the Lake Superior region of the north-central United States.
Author: G. B. Morey
Publisher:
ISBN:
Category : Geology, Stratigraphic
Languages : en
Pages : 42
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Book Description
Lithology, distribution, correlation, and isotope ages of exposed Precambrian rocks in the Lake Superior region of the north-central United States.
Author: Charles Kenneth Leith
Publisher:
ISBN:
Category : Allophanite
Languages : en
Pages : 50
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 20
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Book Description
Author: Richard John Wold
Publisher: Geological Society of America
ISBN: 0813711568
Category : Science
Languages : en
Pages : 289
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Author: Philip B. King
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 96
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 360
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Book Description
Author: Richard W. Ojakangas
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 40
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Book Description
The Early Proterozoic Michigamme Formation of northern Michigan was deposited in the southeastern part of the Animikie basin. The formation conformably overlies the Goodrich Quartzite and comprises three widespread members a lower member of thin-bedded shale, siltstone, and sandstone; the Bijiki Iron-formation Member; and an upper member of tur- biditic graywacke, siltstone, and mudstone and a few local members. The Goodrich Quartzite is interpreted as having been deposited in a tidally influenced shallow marine environ- ment. The lower member of the Michigamme is interpreted as having been deposited in a tidally influenced environment, the iron-formation member as having been deposited below wave base in somewhat deeper water, and the upper member as having been deposited in still deeper water with turbidity currents being a major depositional mechanism. Several lines of evidence including paleocurrents, paleo- geographic setting, and neodymium isotopes suggest that the graywacke of the southern part of the outcrop area was derived from the south (Early Proterozoic Wisconsin magmatic terranes, Archean miniplates, and older Early Proterozoic sedimentary units formed on the continental margin), and that the graywacke in the northern area was derived from an Archean terrane to the north. The tectonic model that best fits the available data is a northward-migrating foreland basin.
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 452
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Author: John C. Reed, Jr.
Publisher: Geological Society of America
ISBN: 081375447X
Category : Science
Languages : en
Pages : 752
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Book Description
This wide-ranging discussion of Precambrian rocks includes contributions from a diverse array of authors actively engaged in investigations of various aspects of U.S. Precambrian geology. Summary discussions by the editors of the five major chapters place these contributions in a logical regional framework.
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 372
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Book Description
