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Abstract and Figures. This chapter discusses the Midcontinent Rift system (MCR). The majority of the rift's igneous rocks are derived from a melting mantle plume and the overlying lithosphere over ...J. B. Paces and J. D. Miller, Jr., "Precise U-Pb Ages of Duluth Complex and Related Mafic Intrusions, Northeastern Minnesota: Geochronological Insights to Physical, Petrogenetic, Paleomagnetic, and Tectonomagmatic Processes Associated with the 1.1 Ga Midcontinent Rift System," J. Geophys. Res. 98, 997-14013 (1993).The Mesoproterozoic Midcontinent Rift System (MRS) of North America hosts a diverse suite of magmatic and hydrothermal mineral deposits in the Lake …The Midcontinent rift system is a 1.1-b.y.-old structure extending from Kansas, through the Lake Superior region, and into southern Michigan. The rift is filled with thick sequences of basaltic volcanic rocks and clastic sediments. For most of its extent it is buried beneath Paleozoic rocks but can be traced by its strong gravity and magnetic anomalies.J. B. Paces and J. D. Miller, Jr., "Precise U-Pb Ages of Duluth Complex and Related Mafic Intrusions, Northeastern Minnesota: Geochronological Insights to Physical, Petrogenetic, Paleomagnetic, and Tectonomagmatic Processes Associated with the 1.1 Ga Midcontinent Rift System," J. Geophys. Res. 98, 997-14013 (1993).The Midcontinent Rift System, which curves for more than 2000 km across the Upper Midwest, is one of the world’s great continental rifts. Rifting began about 1.1 billion years ago, when the Earth’s crust …About 1.1 billion years ago during the Proterozoic Eon a great plume of hot mantle rock rose under this area, stretching the crust and erupting many huge basaltic lava flows (black) in the subsiding basin along the Midcontinent Rift System. Note the Earth's curvature for scale. Lake Superior would eventually form along this ancient rift system.Halls, 1997; Riller et al., 1999). Recently, the Midcontinent rift system has been interpreted as the failed arm of a triple junction as seafloor spread-ing between Laurentia and Amazonia was established (Stein et al., 2015, 2016). The volume of magmatism appears to require mantle hotspot input beyond passive rifting (Stein et al., 2015, 2016).Mid-Continent Rift Story Map By Communications and Publishing. Original Thumbnail Medium. Detailed Description. Meet the Mid-Continent Rift, one of the most geologically fascinating regions in the United States and Canada. Sources/Usage. Public Domain. Public Domain. Explore Search. Minerals; Geology; minerals; Mid-Continent;Detailed Description. The Midcontinent rift system cuts across terranes ranging in age from 3.6 to 1.65 Ga. The location of the rift south of Lake Superior in Minnesota, …Aug 4, 2016 · Called the Midcontinent Rift (MCR), this 3000-kilometer-long feature, made of 1.1-billion-year-old igneous and sedimentary rocks, extends underground across the central United States. It stands... The Midcontinent Rift developed contemporaneously with northwest-directed crustal-scale thrusting in the Grenville orogenic belt. The belt is exposed principally along the southeastern margin of the Canadian Shield, but inliers occur in the Appalachians, the East Greenland Caledonides, Texas, and Mexico. It has been traced at depth… Read More The Proterozoic Midcontinent Rift System of North America is remarkably similar to Phanerozoic rifted continental margins and flood basalt provinces. Like the younger analogues, the volcanism within this older rift can be explained by decompression melting and rapid extrusion of igneous material during lithospheric extension above a broad ...Previous Cu isotope work has documented a clear disparity between δ65Cu values of sheet-style (–0.5 to 0.5‰) and conduit-style (0.5–2.0‰) intrusions associated with the Midcontinent Rift ...The most prominent of these rifts in terms of extent and effect upon the crust is the Midcontinent Rift system (MCR) which extends in a series of generally linear segments in an arcuate pattern for a distance of over 2000 km from southern Kansas to the Lake Superior basin and then south across Michigan. The rift may also extend southerly from ...The Midcontinent Rift is an ancient rift system that could have split the country into two parts a billion years ago. In this live interview at the Sheldon Concert Hall in St. Louis, geologist Michael Wysession discusses how seismologists are using data from earthquakes and gravity measurements to characterize this underground geological scar.The U.S. Department of Energy's Office of Scientific and Technical InformationThe Midcontinent Rift System (MRS) of central North America is a 1.1-Ga, 2500-km long structural feature that has been interpreted as a triple-junction rift developed over a mantle plume. As much as 20 km of subaerial lava flows, mainly flood basalts, are overlain by as much as 10 km of sedimentary rocks that are mostly continental fluvial red ...The Hranice Abyss (Czech Republic), with a reached depth of 473.5 m, is the deepest mapped extent of such a system globally, although its maximum depth is unknown. Multiple geophysical data sets (gravity, electrical resistivity tomography, audiomagnetotellurics, and seismic refraction and reflection) are used to investigate the extent and ...The Midcontinent Rift System (MRS) of central North America is a 1.1-Ga, 2500-km long structural feature that has been interpreted as a triple-junction rift developed over a mantle plume.As much as 20 km of subaerial lava flows, mainly flood basalts, are overlain by as much as 10 km of sedimentary rocks that are mostly continental fluvial red …Geophysical investigations and crustal structure of the North American Midcontinent Rift system (W.J. Hinze et al.). The igneous petrology and magmatic evolution of the Midcontinent rift system (K.W. Klewin, S.B. Shirey). The Midcontinent rift in the Lake Superior region with emphasis on its geodynamic evolution (W.F. Cannon).The Midcontinent Rift System (MRS; Wold and Hinze, 1982) is recognized by a significant elongate magnetic and gravity anomaly extending northeastward from south-central Kansas into the Lake Superior region and hence southeastward into the Michigan basin (Figure 45). Van Schmus and Hinze (1985) and Dickas (1984, 1986) provide …Midcontinent Rift. The Midcontinent Rift (MCR), a 3The Midcontinent Rift System. Figure 2. Generalized The Midcontinent Rift System (MRS), a 2,700 km long, horseshoe shaped, intra-continental, thermo-tectonic structure of Middle Proterozoic age, extends from central Kansas to at least southern Ohio by way of the Lake Superior basin. Its western arm, geophysically identified as the Midcontinent Gravity High, has recently been clarified ...The Midcontinent Rift (MCR) of the north-central United States serves as a testing ground for this approach, where the coincidence of high gravity, low seismic velocity, and minimal topographic relief present a challenge to the generation of a viable crustal and upper mantle density model. ... F is a system of zero-order Kelvin-Bessel functions ... [Show full abstract] northeastern Kansas is a The Midcontinent rift system is a 1.1-b.y.-old structure extending from Kansas, through the Lake Superior region, and into southern Michigan. The rift is filled with thick sequences of basaltic ...@article{osti_6431485, title = {Organic Geochemical and tectonic evolution of the Midcontinent Rift system}, author = {Hayes, J M and Pratt, L M and Knoll, A H}, abstractNote = {The older assemblages stand in contrast with the ca. 1000 Ma old Hunting Formation, Arctic Canada, which contains what may be the oldest evidence for modem algae - red algal fossils that compare closely with members of ... The Proterozoic Midcontinent Rift System of North Americ

The thickness of the sedimentary cover increases from 0 in the north to over 40,000 ft in the south. In the northern and central parts of the region, remains of a Precambrian rift zone provide the basis for a hypothetical play (Precambrian Midcontinent Rift System).Sep 30, 2019 · The Midcontinent Rift System (MRS) is a Late Mesoproterozoic (∼1.1 Ga) sequence of volcanic and sedimentary rocks exposed in the Lake Superior Region of North America. The MRS continues to be the focus of much research due to its economic mineral deposits as well as its archive of Precambrian life and tectonic processes. Explore the United States' Mountain region and its diverse landscape, rivers, and settlement Learn how the world is divided into continents How the billion-year-old Midcontinent Rift helped form Lake Superior.The structure and geometry of the 1.1-b.y.-old Midcontinent Rift system under Lake Superior is interpreted from 20 seismic reflection profiles recorded during the early and mid-1980s. The seismic ...

The Midcontinent Rift system and surrounding Precambrian rocks are known to host highly significant mineral resources. Our project objectives are to increase understanding of this system through the integration of new and legacy geophysical data with geochemical and borehole data, map the lithology and structure of PreCambrian rocks, and develop an integrated 3D geologic model of the region.Midcontinent rift system basalts: Implications for multiple mantle sources during rift devel-opment: Canadian Journal of Earth Sciences, v. 34, p. 504-520, doi: 10 .1139 /e17 -041 .…

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. Midcontinent Rift in Iowa. Stratigraphy, Structure, an. Possible cause: S-to-P receiver functions constrain a Moho, crustal underplating and midlit.