Midcontinent rift system.

Midcontinent Rift System in Northeastern Kansas Timothy S. Woelk 1 and William J. Hinze 2. 1 ARCO Oil & Gas Company and 2 Purdue University This article available as an Acrobat PDF file (6.7 Mb). Introduction. One of the major tectonic features of North America is the 1,100-Ma Midcontinent Rift System (MCR).The Midcontinent Rift System (MRS) is a Middle Proterozoic failed rift system that stretches from eastern Lake Superior to central Kansas. Over most of its length, it is characterized by a central horst (dominated by mafic volcanic rocks) flanked by a series of clastic-filled basins that thicken towards the horst in the half-graben configurations.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, asthenospheric, thermal anomaly which we call the KeweenawJ. 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).Magmatic Ni-Cu-PGE mineralization in the ~ 1.1 Ga Midcontinent Rift System ( Fig. 1 ) in North America can be broadly divided into three types (see a recent rev iew by Ripley, 2014 ).

Growing interest in the Midcontinent Rift System over the past several years, fostered in part by the potential of this Keweenawan rift as a frontier hydrocarbon province, has led to an increased number of deeply penetrating seismic-reflection profiles over the structure. Two studies by the Consortium for Continental Reflection Profiling ...

The continental lithosphere which hosts the Midcontinent Rift (MCR) system comprises a crustal assemblage ranging in age from 3.6 to 1.5 Ga. The most voluminous igneous activity along the MCR occurred within Late Archean (2.7 Ga) crust, presumably due to magmatism associated with a rising mantle plume. Two major arms of …The graphic, inset, shows gravity mapping done of the Midcontinent Rift System by the U.S. Geological Survey: “MRS volcanic rocks (shown as warmer, reddish colors) that occupy the center of the rift are more dense than the MRS sedimentary rocks (shown as cooler bluish colors) that flank both sides of the volcanics.” At left, a diagram …

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 MoreTranscript. [A map of North America shows the Midcontinent Rift System as a red line curving through the Great Lakes and down through the midwestern United States.] 1.1 billion years ago, the North American continent began to split in half. [Black Hat stands at a lectern with a "Vote 2020" sign on it. He gestures to an image of the globe with a ...MRS Midcontinent Rift System PLV Portage Lake Volcanics SBAS Satellite Based Augmentation Systems USCG United States Coast Guard USGS United States Geological Survey . viii . Abstract The Keweenaw Fault (KF) has been interpreted as arift-bounding normal fault along the southern margin of the Midcontinent Rift System; later inverted …The Keweenaw Peninsula lies on the southern flank of the Mid-Continent Rift system (MCR) of North America. The MCR extends for about 2,000 kilometres from Kansas northeast through Lake Superior, then southeast through the lower peninsula of Michigan where it ends abruptly near Detroit, Michigan.

The Mid-Continent Rift System (MCRS) is a 3000-km long failed rift system that formed within the Precambrian continent of Laurentia, nearly splitting North America apart about 1.1 billion years ago.

Called the Midcontinent Rift System (MCRS), this structure is a 1.1 billion–year–old, 1,864-mile (3,000 km) long, mostly buried scar along which the North American continent started to tear apart. However, the rifting stopped for some reason and failed to form a new ocean.

THE MIDCONTINENT RIFT SYSTEM W. R. Van Schmus Department of Geology, University of Kansas, Lawrence, Kansas 66045 W. J. Hinze Department of Geosciences, Purdue University, West Lafayette, Indiana 47907 1. INTRODUCTION One of the most prominent features on gravity and aeromagnetic maps of the United States is a series of major, generally linear ...between ____ billion years ago, the east continent-midcontinent rift system opened a large arcuate gash in ____ from Kansas to the upper Great Lake region. normal, tensional ____ faulting produced by ____ forces, can be found within the rocks of the East Continent-Midcontinent rift systemThe 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 (MRS) is a 1.1 Ga sequence of voluminous basaltic eruptions and multiple intrusions followed by widespread sedimentation that extends across the Midcontinent and ...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.Detrital zircon U-Pb geochronology of the Pre- The Mesoproterozoic Midcontinent Rift system, cambrian Middle Run Formation (Eastern North Lake Superior region, USA: Sedimentary Geol- America Basement): Implications for Grenvillian ogy, v. 141, p. 421-442, https://doi .org /10 .1016 ACKNOWLEDGMENTS foreland basin evolution and midcontinent ...Paces, J.B., and Bell, K., 1989, Non-depleted sub-continental mantle beneath the Superior Province of the Canadian Shield: Nd-Sr isotopic and trace element evidence from Midcontinent Rift basalts: Geochimica et Cosmochimica Acta, v. 53, p. 2023-2035.

The Midcontinent Rift System (MRS) is a Middle Proterozoic failed rift system that stretches from eastern Lake Superior to central Kansas. Over most of its length, it is characterized by a central horst (dominated by mafic volcanic rocks) flanked by a series of clastic-filled basins that thicken towards the horst in the half-graben ...The Keweenaw Peninsula lies on the southern flank of the Mid-Continent Rift system (MCR) of North America. The MCR extends for about 2,000 kilometres from Kansas northeast through Lake Superior, then southeast through the lower peninsula of Michigan where it ends abruptly near Detroit, Michigan. Dec 4, 2013 · Stein proposes a three-armed rift system, formed of the Midcontinent Rift and the two arms that split Laurentia and Amazonia. “In a lot of locations, when the continents break apart you seem to ... The Stenian period Midcontinent Rift System that is still visible at the surface in the area of Lake Superior. The Mississippi embayment with the associated New Madrid Seismic Zone is an example of an ancient aulacogen that dates back to the breakup of the ancient continent, Rodinia.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).The Midcontinent Rift of North America is a ca. 1.1 Ga, 3000-km-long failed rift that nearly split the Precambrian continent of Laurentia. Unlike most continental rifts, which are filled with a mixture of volcanic rocks and sediments, the Midcontinent Rift contains a large volume of flood basalts that were emplaced during both syn- and post …

and conduit-style (0.5-2.0‰) intrusions associated with the Midcontinent Rift System. The application of metal isotopes to the study of magmatic Ni-Cu-platinum group element (PGE) deposits is ...Midcontinent Rift System Bibliography. 1995 • Steven Hauck. Download Free PDF View PDF. Sedimentary provenance and weathering processes in the 1.1 Ga Midcontinental Rift of the Keweenaw Peninsula, Michigan, USA. Ria L Mitchell.

Introduction. Three major Precambrian crustal elements are inferred to underlie Phanerozoic strata in the eastern midcontinent of Laurentia: (1) the Grenville Front Tectonic Zone, the latest Mesoproterozoic to earliest Neoproterozoic western boundary of the Grenville orogen; (2) the East Continent Rift System, a southerly extension of the east arm of the Midcontinent Rift System, developed in ...Rifts Connected to the Mid-continent Rift System. A rift may extend from the western end of the Southern Oklahoma Aulacogen westward into Colorado. The Pikes Peak Granite is alkalic and was intruded about 1.04 by ago (Barker et al., 1975), possibly along a rift.The Midcontinent rift system (MCR) of North America is a major geological and geophysical anomaly. This feature was initially identified through potential field studies of North America (e.g., Ocola and Meyer, 1973). Later seismic reflection studies, building upon geological mapping of the rift-related rocks, interpreted the MCR as deposits of ...Using sequential restorations of three published cross sections within Nebraska and Kansas this study demonstrates that the Nemaha Tectonic Zone and Midcontinent Rift System have each been reactivated several times since the end of the Mississippian (the details of deformation prior to the Mississippian are not considered).The Middle Proterozoic Midcontinent Rift System is one of the world's great continental rifts. This 1,100-Ma rift, which extends more than 2,000 km across the North American craton, is a major ...The Mesoproterozoic Midcontinent Rift System (MRS) of North America hosts a diverse suite of magmatic and hydrothermal mineral deposits in the Lake Superior region where rift rocks are exposed at or near the surface. Historically, hydrothermal deposits, such as Michigan's native copper deposits and the White Pine sediment-hosted stratiform copper deposit, were major MRS metal producers.

Continental rifting at 1.1 Ga produced approximately 1.3 × 10 6 km 3 of igneous rocks over a rift length of 2200 km (Midcontinent Rift System, MRS). These constitute one of the largest as well as oldest flood basalt provinces. Both geophysical (Hutchinson et al. 1990) and geochemical evidence (Nicholson and Shirey 1990) suggest that magma production resulted from decompression melting of a ...

Moho reflections recorded in Lake Superior over the Midcontinent Rift system have times from 14-18 s (about 46 km to as great as 58 km) in contrast to times of about 11-13 s (about 36-42 km crustal thickness) beneath the surrounding Great Lakes. The Seismically complex deep-crust to mantle transition zone (30-60 km) in north-central ...

Aug 10, 1993 · Mafic intrusive rocks constitute a major portion of the exposed 1100 Ma (Keweenawan) Midcontinent Rift system in northeastern Minnesota; however, prior to this study, geochronological data were insufficient to allow rigorous interpretation of intrusive histories and their relationships to extrusive suites. The structure of the Precambrian basement of Kansas, Midcontinent USA, is dominated by conjugate NNE and NW trending wrench fault zones. NNE trending faults of the Midcontinent Rift System (MRS) extend from Lake Superior across Kansas and into north-central Oklahoma. The fault zone widens from about 100 km in northeast Kansas to more than 160 ...The U.S. Department of Energy's Office of Scientific and Technical InformationThe 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 tectono-magmatic history of the Midcontinent rift system can be explained by the presence of a mantle plume bringing elevated-temperature mantle beneath the rift system at about 1110 Ma.The 1.1 Ga Midcontinent rift system of North America is one of the world's major continental rifts and hosts a variety of mineral deposits. The rocks and mineral deposits of this 2000 km long rift are exposed only in the Lake Superior region. In the Lake Superior region, the rift cuts across Precambrian basement terranes ranging in age from …The 1,100 million-year-old Midcontinent Rift System (MRS), one of the world's great continental rifts, contains a unique assemblage of magmatic and hydrothermal mineral deposits. Although extending from Kansas through Michigan, rocks of the MRS are exposed at the surface only in the Lake Superior region, where they create much of the lake's ...New Insights into North America’s Midcontinent Rift. Solving the Midwest’s Biggest Geologic Mystery. Mysterious Midcontinent Rift is a Geological Hybrid. Sharing Lake Superior’s Secrets. North America’s broken heart (Nature) A real rift in the midcontinent (Earth magazine) 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 ...and conduit-style (0.5-2.0‰) intrusions associated with the Midcontinent Rift System. The application of metal isotopes to the study of magmatic Ni-Cu-platinum group element (PGE) deposits is ...

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 ...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...and conduit-style (0.5-2.0‰) intrusions associated with the Midcontinent Rift System. The application of metal isotopes to the study of magmatic Ni-Cu-platinum group element (PGE) deposits is ...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 ...Instagram:https://instagram. cbs ncaa bb scoresku printing servicesandreww wigginsfootball rodriguez Mysterious Midcontinent Rift is a geological hybrid. The volcanic rocks of the 1.1 billion-year-old Midcontinent Rift play a prominent role in the natural beauty of Isle Royale National Park in Lake Superior. Credit: Image courtesy of Northwestern University. An international team of geologists has a new explanation for how the Midwest’s ...The late Mesoproterozoic Midcontinent Rift (MCR) is a prominent tectonomagmatic feature that extends >2000 km through the Laurentia craton (Fig. 1; Ojakangas et al., 2001; Woodruff et al., 2020).In the vicinity of Lake Superior, there is a well-exposed >10-km-thick succession of ca. 1110–1083 Ma rift-related volcanic rocks … don chebest dino for flint ark 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 ... kansas ranking football Uncertainty exists in the configuration and extent of the Midcontinent Rift System (MRS) because of deficiencies in geophysical data and limited information from outcrops and basement drill holes. Additional ambiguity is caused by misunderstanding the definition of continental rifts. Six principal problematic regions in mapping the MRS are ...The Keweenawan large igneous province (LIP) of the Midcontinent Rift System (MRS) of North America is perhaps the most prolifically and diversely mineralized LIP known on Earth (Nicholson et al., 1992). The MRS is an approximately 2,200 km curvilinear continental rift that stretches from Kansas northeast to the Lake Superior region where it turns southeast and extends through lower Michigan (Fig.The ca. 1100 Ma old Midcontinent Rift System (MRS) 1 is arguably the most significant non-orogenic tectonic feature of mid-North America because of its major disturbance of the lithosphere, vast extent, impact on latter tectonism of the region, and its earth resources.