3 edition of Post-Keweenawan compressive tectonism in the Midcontinent Rift of Eastern Lake Superior found in the catalog.
Post-Keweenawan compressive tectonism in the Midcontinent Rift of Eastern Lake Superior
Matthew Lamont Manson
Written in English
|The Physical Object|
|Number of Pages||289|
Dec 08, · The Midcontinent Rift, which started but failed to split North America in two pieces billion years ago, is the biggest failed rift ever discovered. It was formed when , cubic miles of volcanic rock poured out of the rift and formed the beautiful cliffs around Lake Superior. Oct 16, · Geologists have a new explanation for the formation of the Midcontinent Rift, an ancient 2,mile-long underground crack that starts in Lake Superior and runs south. The rift is a geological hybrid, having formed in three stages: it started as an enormous narrow crack in the Earth's crust;.
the regional geology of the Midcontinent rift on the south ern shore of Lake Superior. The geology and mineral deposits of the district have been painstakingly studied for many years. Especially sig nificant were the extensive report of Butler and Burbank () and the detailed geologic maps produced by theCited by: 5. Abstract Travel times and amplitudes of refracted and reflected arrivals observed during GLIMPCE (Great Lakes International Multidisciplinary Program on Crustal Evolution) from the Midcontinent Rift in Lake Superior have been modeled using two-dimensional ray-tracing techniques.
Oct 16, · The Midcontinent Rift is both of these -- like a hybrid animal.” “Geologists call it a rift because it’s long and narrow,” explained Seth Stein, a co-author of the study, “but it’s got much more volcanic rock inside it than any other rift on a continent, so it’s also a LIP. We’ve been wondering for a long time how this could. A Brief Geological History of the Keweenaw: pacificwomensnetwork.com: Climbing, hiking, mountaineering. Toggle navigation. Similar to the modern Rift Valley in eastern Africa, this rift never got big enough to splinter the continent into pieces, but touched off a series of events that formed the most geologically noticeable features of the region 93%(39).
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GLIMPCE aeromagnetic data in eastern Lake Superior are characterized by a series of strong easterly- and northeasterly-oriented gradients that relate to mapped post-Keweenawan faults occurring along the eastern shore.
The reversed nature of three of the faults is established through field observations and potential field pacificwomensnetwork.com by: The Lake Superior segment of the Midcontinent rift developed within the most unstable block, bounded by the Gravel River fault to the northwest and the Ivanhoe Lake fault (the eastern margin of.
The Midcontinent Rift ran from at least Kansas, up into Lake Superior, and then down into Lower Michigan. Though rift related rocks are only exposed in the Lake Superior region, with drill cores and gravity analyses we are able to know the extent of this ancient event. Between and Ma, most of a to km thickness of dominantly tholeiitic basalt erupted in the Midcontinent Rift System of the Lake Superior region, North American.
About this Book Published by the American Geophysical Union as part of the Field Trip Guidebooks Series, Volume Fifty-six years ago (), the geology of the "Lake Superior Region", constituting Excursion C-4, was presented as Guidebook 27 of the XVI International Geological Congress.
The Mid-Continent Rift The Rove Sea. The Rove Sea was a shallow inland sea covering the region of Lake Superior, Northern Ontario and Minnesota. Fine sediments settled out over millions of years and covered up evidence of the meteorite impact.
The Great Lakes rift, or Keweenawan rift, first broke open along a 2, kilometer arcuate, or bow shaped, rift (Miller, 1). The two arms of the rift extended into present day Minnesota, and Wisconsin.
A third minor limb shoots off to the north, at the top of present day Lake Superior. Oct 13, · The Mid-Continent Rift (MCR) is a dominant feature in potential fields of central North America (Ocola and Meyer, ; Fig. 1a).The rift signature extends km from the Grenville front in southeast Michigan into Lake Superior and its features eventually terminate in Kansas (Hinze et al., ).Rocks of the rift are mostly obscured by the Phanerozoic cover except in the Lake Superior Cited by: The eastern arm of the Midcontinent Rift crops out due to uplift and orogenies related to the Grenville province.
Evidence for a third arm to the north of Lake Superior is not nearly as defined as the two arms to the south (Van Schmus & Hinze, ).
Tectonophysics, () Elsevier Science Publishers B.V., Ainsterdam Tectonic setting of the Midcontinent Rift system W.R. Van Schmus Department of Geology, University of Kansas, Lawrence, KSUSA (Received April 2, ; revised version accepted September 3, ) ABSTRACT Van Schmus, W.R., Cited by: Abstract.
In the Lake Superior region, four “sequences” of sedimentary rocks reflect the tectonic-sedimentary framework immediately before, during, and after the Ma magmatic event that resulted in as much as 20, m of dominantly basaltic subaerial lava flows and large gabbroic intrusions (Behrendt et al.
).Cited by: 1. Jan 25, · In the Lake Superior region, rocks of the rift contain a wealth of mineral resources that formed by magmatic and hydrothermal processes during the ~30 million year course of rift development.
Rift rocks are host to Michigan’s storied native copper deposits, and contain significant copper and nickel that were deposited during various stages of. Lake Superior is located above the Midcontinent Rift, so the rift provided the region’s first transportation system, which is still crucial today.
European settlers and traders used the lake to import and export trade goods, lake fisheries were significant first commercially and now recreationally, and the lake remains an economic engine today. About this book Published by the American Geophysical Union as part of the Field Trip Guidebooks Series, Volume Fifty-six years ago (), the geology of the “Lake Superior Region”, constituting Excursion C-4, was presented as Guidebook 27 of the XVI International Geological Congress.
The cliffs on the shores of Lake Superior—and the lake itself—are part of such a fossilized rift. Called the Midcontinent Rift (MCR), this kilometer-long feature, made of billion-year-old igneous and sedimentary rocks, extends underground across the central United pacificwomensnetwork.com by: Potential-field studies have historically played a major role in delineating the km extent of the Midcontinent Rift (MCR) that occurs beneath the overlying Phanerozoic strata of the craton.
Integrated Potential-Field and Seismic Reflection Studies of the Midcontinent Rift in Eastern Lake Superior Author: John Mariano, William J. Hinze. During the middle s, 14 tensor MT soundings plus a dense profile of controlled-source audio magnetotelluric (CSAMT) data were acquired in eastern Minnesota and northwestern Wisconsin over the presumed location of the Superior-Penokean suture from its near foreland area at the northwest end, across the Midcontinent rift system, and into the Cited by: 3.
This part of the rift is almost completely unknown, and work here will help provide a basis for expanding the understanding of the extent and nature of the entire Midcontinent Rift system.
To develop an integrated 3D geology model of the midcontinent rift in the western Lake Superior region from legacy geophysical data, new EarthScope and. Nov 14, · Geologists say Lake Superior’s dark, volcanic cliffs are the exposed remains of the Midcontinent Rift, which was poised to split our continent over a billion years ago.
Model of the midcontinent rift system in northeastern Kansas Timothy S. Woelk. Proterozoic reactivation of the southern Superior Province and its role in the evolution of the Midcontinent rift Possible extension of the Midcontinent Rift in west Texas and eastern New MexicoCited by:.
The Midcontinent rift is a Middle Proterozoic continental rift which records about 15 m.y. of extension, subsidence, and voluminous volcanism in the period Ma in the central part of North America.
During that time the crust was nearly totally separated and as much as 25 km of subaerial basalts accumulated in a deep central depression.Geological map of North America showing (in white) the Midcontinent Rift, here labeled Keweenawan Rift.
Lake Superior occupies the apex of the rift. The Midcontinent Rift System (MRS) or Keweenawan Rift is a 2, km (1, mi) long geological rift in the center of the North American continent and south-central part of the North American plate.Dec 06, · Post-rift deformation of the Midcontinent rift under Grenville tectonism The objective of this study is to investigate factors involved in shaping the post-rift structure of the Midcontinent rift including: the size and location of the colliding terranes and the convergence angle between the colliding terranes and the North American craton.