Precambrian Crustal Blocks In Minnesota
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Precambrian Crustal Blocks In Minnesota
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Author : S. R. Hemming
language : en
Publisher:
Release Date : 1995
Precambrian Crustal Blocks In Minnesota written by S. R. Hemming and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Geology categories.
Sm-Nd survey of Precambrian granitic and metasedimentary rocks collected from several geophysically defined blocks in central Minnesota confirms the presence of some fundamental geologic boundaries previously mapped on the basis of structure. The Malmo discontinuity an Early Proterozoic structure separates the Archean Minnesota River Valley ter- ranes from an Early Proterozoic (Penokean magmatic) terrane and the McGrath Gneiss dome of east-central Minnesota North of this boundary, the Penokean fold-and-thrust belt can be divided into fault-bounded terranes that were assembled during the Penokean orogeny. Each terrane within the study area has distinct crust formation ages.
U S Geological Survey Bulletin
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Author :
language : en
Publisher:
Release Date : 1983
U S Geological Survey Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Geology categories.
U S Geological Survey Bulletin
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Author : Paul Kibler Sims
language : en
Publisher:
Release Date : 1983
U S Geological Survey Bulletin written by Paul Kibler Sims and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Faults (Geology) categories.
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.
Great Lakes Rocks
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Author : Stephen E Kesler
language : en
Publisher: University of MICHIGAN REGIONAL
Release Date : 2019-05-01
Great Lakes Rocks written by Stephen E Kesler and has been published by University of MICHIGAN REGIONAL this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-05-01 with Science categories.
The geologic story of the Great Lakes region is one of the most remarkable of any place on Earth. Great Lakes Rocks takes readers on this fascinating journey through geologic history, beginning with an investigation of the surface features—the hills and valleys, waterfalls and caves, and the Great Lakes themselves—that we encounter on a daily basis. From there the book digs deeper into the past, and readers learn about the amazing techniques geologists have used to reconstruct the events that shaped this region millions and even billions of years before humans set foot on Earth. Throughout, the book gives special attention to the link between the region’s geology and its modern history, including the impacts of geology on settlement patterns as well as the development of industries and the present-day economy. Other discussed topics include natural hazards that are geologic in nature, including earthquakes, floods, landslides, and coastal erosion, as well as information on rocks, minerals, and ancient life seen in fossils. Written for nonspecialist readers, this book provides a detailed but easy-to-follow introduction to the geology of the Great Lakes region, and it is an ideal fit for introductory geology courses, including those aimed at nonscience majors.
Antarctica
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Author : Dieter K. Fütterer
language : en
Publisher: Springer Science & Business Media
Release Date : 2006-05-11
Antarctica written by Dieter K. Fütterer and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-05-11 with Science categories.
Sixty articles arranged in eight thematic sections refer to most recent geological and geophysical results of Antarctic research. The Precambrian of the East Antarctic shield and its geological history is considered as well as sub-ice topography, geophysics and stratigraphy, sedimentology and geophysics of the surrounding Southern Ocean. Particular emphasis is given to the connection of the Antarctic and the surrounding continents when forming part of Gondwana.
Archean To Anthropocene
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Author : James D. Miller
language : en
Publisher: Geological Society of America
Release Date : 2011-01-01
Archean To Anthropocene written by James D. Miller and has been published by Geological Society of America this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-01-01 with Science categories.
The Basis For A Continental Drilling Program In Minnesota
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Author : G. B. Morey
language : en
Publisher:
Release Date : 1976
The Basis For A Continental Drilling Program In Minnesota written by G. B. Morey and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Geology categories.
4 D Framework Of Continental Crust
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Author : Robert D. Hatcher
language : en
Publisher: Geological Society of America
Release Date : 2007
4 D Framework Of Continental Crust written by Robert D. Hatcher and has been published by Geological Society of America this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Science categories.
"This book contains landmark papers on the processes of formation of continental crust from its beginnings in the Archean to modern processes, as well as discussions of several ancient and modern orogenic belts. The book is international in scope, with contributions from geoscientists dealing with crustal processes on five continents, and articles from more than 50 non-U.S. authors and co-authors."--Publisher's website.
New Publications Of The Geological Survey
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Author : Geological Survey (U.S.)
language : en
Publisher:
Release Date : 1995
New Publications Of The Geological Survey written by Geological Survey (U.S.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Geology categories.
Information Circular
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Author :
language : en
Publisher:
Release Date : 1964
Information Circular written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with Geology categories.