Precambrian Crustal Blocks In Minnesota Neodymium Isotope Evidence From Basement And Metasedimentary Rocks PDF Download
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Author | : S. R. Hemming |
Publisher | : |
Total Pages | : 24 |
Release | : 1995 |
Genre | : Geology |
ISBN | : |
Download Precambrian Crustal Blocks in Minnesota Book in PDF, ePub and Kindle
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 | : S. R. Hemming |
Publisher | : |
Total Pages | : 15 |
Release | : 1995 |
Genre | : Geology |
ISBN | : |
Download Precambrian Crustal Blocks in Minnesota--neodymium Isotope Evidence from Basement and Metasedimentary Rocks Book in PDF, ePub and Kindle
Author | : S. R. Hemming |
Publisher | : |
Total Pages | : 15 |
Release | : 1995 |
Genre | : Geology |
ISBN | : |
Download Precambrian Crustal Blocks in Minnesota Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 372 |
Release | : 1983 |
Genre | : Geology |
ISBN | : |
Download U.S. Geological Survey Bulletin Book in PDF, ePub and Kindle
Author | : Paul Kibler Sims |
Publisher | : |
Total Pages | : 268 |
Release | : 1983 |
Genre | : Faults (Geology) |
ISBN | : |
Download U.S. Geological Survey Bulletin Book in PDF, ePub and Kindle
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 | : Geological Survey (U.S.) |
Publisher | : |
Total Pages | : 156 |
Release | : 1995 |
Genre | : Geology |
ISBN | : |
Download New Publications of the U.S. Geological Survey Book in PDF, ePub and Kindle
Author | : Geological Survey (U.S.) |
Publisher | : |
Total Pages | : 428 |
Release | : 1995 |
Genre | : Geology |
ISBN | : |
Download New Publications of the Geological Survey Book in PDF, ePub and Kindle
Author | : Stephen E. Kesler |
Publisher | : University of Michigan Regional |
Total Pages | : 369 |
Release | : 2019 |
Genre | : Science |
ISBN | : 0472053809 |
Download Great Lakes Rocks Book in PDF, ePub and Kindle
A much-needed exploration of Great Lakes geology
Author | : Mingguo Zhai |
Publisher | : Springer |
Total Pages | : 389 |
Release | : 2015-08-11 |
Genre | : Science |
ISBN | : 3662478854 |
Download Precambrian Geology of China Book in PDF, ePub and Kindle
This book is the first contribution to the overview of Precambrian geology of China. It covers Precambrian geology of the North China Craton, the South China Craton and the Tarim Craton, as well as other smaller blocks in the Chinese orogenic belts. It provides systematic concepts of the Chinese paleo-continents and incorporates the most up-to-date achievements. Edited by many of the active researchers working at the forefront of the related fields, it contributes greatly to the international Precambrian geology community and would be of interest to geoscientists working in the research field of geology of China and Precambrian geodynamics.
Author | : James D. Miller |
Publisher | : Geological Society of America |
Total Pages | : 593 |
Release | : 2011-01-01 |
Genre | : Science |
ISBN | : 0813700248 |
Download Archean to Anthropocene Book in PDF, ePub and Kindle