Tectonic Imbrication and Foredeep Development in the Penokean Orogen, East-central Minnesota PDF Download
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Author: David Leroy Southwick
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 40
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Author: David Leroy Southwick
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 40
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Book Description
Author: J. Warren Beck
Publisher:
ISBN:
Category : Geology, Structural
Languages : en
Pages : 564
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Author: Paul Kibler Sims
Publisher:
ISBN:
Category : Faults (Geology)
Languages : en
Pages : 268
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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: Gene L. LaBerge
Publisher:
ISBN:
Category : Faults (Geology)
Languages : en
Pages : 346
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A reconnaissance study carried out in conjunction with regional geologic mapping.
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 372
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 360
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Author: J. Warren Beck
Publisher:
ISBN:
Category : Basalt
Languages : en
Pages : 36
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Author: S. R. Hemming
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 24
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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.
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 462
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Author: James D. Miller
Publisher: Geological Society of America
ISBN: 0813700248
Category : Science
Languages : en
Pages : 593
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