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Author : G. B. Morey,Gilbert N. Hanson
Publisher : Geological Society of America
Page : 183 pages
File Size : 52,8 Mb
Release : 1980
Category : Science
ISBN : 9780813721828
Author : L. Gordon Medaris
Publisher : Geological Society of America
Page : 151 pages
File Size : 55,8 Mb
Release : 1983-01-01
Category : Science
ISBN : 9780813711607
Author : Anonim
Publisher : Unknown
Page : 162 pages
File Size : 47,7 Mb
Release : 1934
Category : Geology
ISBN : UOM:39015042198245
Author : Anonim
Publisher : Unknown
Page : 688 pages
File Size : 40,6 Mb
Release : 1934
Category : Geology
ISBN : IOWA:31858053627612
Author : David M. Harland
Publisher : Springer Science & Business Media
Page : 500 pages
File Size : 41,9 Mb
Release : 2001-10-18
Category : Science
ISBN : 1852333758
Distinguished space historian Harland tells an inspiring tale of scientific discovery with two interwoven strands tracing the earths geological history and the Earth in relation to the solar system. 100 illustrations.
Author : Geological Survey (U.S.)
Publisher : Unknown
Page : 32 pages
File Size : 53,7 Mb
Release : 1985
Category : Geology
ISBN : UFL:31262043555233
Author : Anonim
Publisher : Unknown
Page : 360 pages
File Size : 40,5 Mb
Release : 1984
Category : Electronic
ISBN : MINN:31951P00688600X
Author : Zell E. Peterman,Diane C. Schnabel
Publisher : Unknown
Page : 232 pages
File Size : 45,7 Mb
Release : 1986
Category : Geochronometry
ISBN : WISC:89078837689
Author : James D. Miller,George H. Hudak,Chad Wittkop,Patrick I. McLaughlin
Publisher : Geological Society of America
Page : 593 pages
File Size : 53,5 Mb
Release : 2011-01-01
Category : Science
ISBN : 9780813700243
Author : Paul Kibler Sime,Warren C. Day
Publisher : Unknown
Page : 20 pages
File Size : 42,7 Mb
Release : 1993
Category : Faults (Geology)
ISBN : UOM:39015095006923
The Great Lakes tectonic zone (GLTZ) is a Late Archean crustal boundary (paleosuture) at least 1,200 kilometers long that juxtaposes a Late Archean greenstone-granite terrane (Wawa subprovince of Superior province) on the north and an Early to Late Archean gneiss terrane (Minnesota River Valley subprovince) on the south. Recent mapping of an exposed seg- ment in the Marquette, Michigan, area provides new data on the vergence of the structure. These data necessitate reexami- nation of the COCORP seismic-reflection profiling in central Minnesota, which has been the principal basis for past views on the vergence of the GLTZ. In the Marquette area, the GLTZ is a northwest-striking mylonite zone about 2.3 kilometers wide that is superposed on previously deformed rocks of both Archean terranes. Shear zone walls strike N. 55°-60° W., and foliation in mylonite within the GLTZ strikes (average) N. 70° W. and dips 75° SW. A stretching lineation plunges 42° in a S. 43° E. direction. Hinges of tight to open (sheath?) folds of both Z- and S-symmetries plunge parallel to the lineation. The attitude of the lineation (line of tectonic transport and X finite strain axis), together with asymmetric kinematic indicators, indicates that collision at this locality was oblique; the collision resulted in dextral- thrust shear along the boundary, northwestward vergence, and overriding of the greenstone-granite terrane by the gneiss terrane. In contrast, the seismic-reflection profiling in central Minnesota has been interpreted by several investigators to indicate that the GLTZ is a shallowly north dipping (=30°) structure, which implies southward vergence on a north-dipping subduction zone. We suggest, alternatively, that the shallow- dipping reflectors in the seismic profiles indicate lithologic contacts related to recumbent and gently inclined folds (D1), perhaps enhanced by ductile deformation zones, and that the Morris fault is indeed the GLTZ. The Morris fault strikes about N. 70° E., dips steeply southeastward, is transparent in seismic profiles, appears to be narrow, and coincides with the inferred position of the GLTZ as shown on earlier maps. The oblique collision along northwest-trending segments of the GLTZ would be expected to produce dextral transpression across a large region north of the GLTZ, and may have produced an early nappe-forming event (D1) as well as younger upright folds (D2), and as a later, more brittle event, the numerous dextral faults and conjugate sinistral faults that are widespread in the Wawa and adjacent subprovinces.
Author : Anonim
Publisher : Unknown
Page : 524 pages
File Size : 51,6 Mb
Release : 1983
Category : Geology
ISBN : MINN:31951000963666H
Author : Paul Kibler Sims,Richard W. Ojakangas,S. A. Nachatilo,S. R. Hemming,Theodore J. Bornhorst,Val W. Chandler,William J. Gregg,G. B. Morey,Gilbert N. Hanson,R. L. Bauer,Rodney C. Johnson,Warren C. Day,Scott M. McLennan
Publisher : Unknown
Page : 272 pages
File Size : 46,5 Mb
Release : 1983
Category : Faults (Geology)
ISBN : OSU:32435056587991
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 : John C. Reed, Jr.,Marion E. Bickford,R.S. Houston,Paul Karl Link,D.W. Rankin,Paul K. Sims,W. Randall Van Schmus
Publisher : Geological Society of America
Page : 752 pages
File Size : 45,6 Mb
Release : 1993
Category : Science
ISBN : 9780813754475
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 : Gene L. LaBerge,David Leroy Southwick,J. S. Klasner,J. Warren Beck,Karin M. Barovich,Paul Kibler Sims,Rodney C. Johnson,John Patchett,K. J. Schulz,R. W. Ojakangas,Theodore J. Bornhorst,V. Rama Murthy,Ed DeWitt,Paul E. Myers,Zell E. Peterman,Bruce Brasaemle
Publisher : Unknown
Page : 344 pages
File Size : 47,6 Mb
Release : 1991
Category : Faults (Geology)
ISBN : OSU:32435050093574
A reconnaissance study carried out in conjunction with regional geologic mapping.
Author : Paul Kibler Sims,K. J. Schulz,Zell E. Peterman
Publisher : Unknown
Page : 76 pages
File Size : 52,5 Mb
Release : 1992
Category : Geochemistry
ISBN : ERDC:35925002837844
Field relations, lithology, isotope ages, and tectonic implications of volcanic and granitoid rocks.