Midcontinent rift system. Compressional-wave seismic velocity (velocity) and bulk density ...

The Mesoproterozoic Midcontinent Rift System (MRS) of North America h

Abstract. Recent drilling of the midcontinent rift system in northeastern Kansas reveals a transposed Keweenawan stratigraphy of mafic volcanic rocks overlying thick elastic sedimentary rocks. A reprocessed version of COCORP Kansas Line 1 indicates that the drillhole penetrated a series of west-dipping reflectors associated with a reverse fault ...The East Continent Rift Basin (ECRB) is a newly recognized, dominantly sedimentary-volcanic Proterozoic rift basin that apparently represents the southern extension of the Keweenawan Midcontinent Rift. The ECRB extends from central Michigan at least as far south as south-central Kentucky. The inferred age of the rift fill is approximately 1,000 Ma.Precise resolution of the timing of igneous activity is crucial to understanding the dynamic processes associated with continental rifting. 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 historiThe Midcontinent Rift System (MRS) or Keweenawan Rift is a 2,000 km (1,200 mi) long geological rift in the center of the North American continent and south-central part of the North American plate. It formed when the continent's core, the North American craton, began to split apart during the Mesoproterozoic era of the …Ga Midcontinent rift system basalts: Implications for multiple mantle sources during rift development: Canadian Journal of Earth Sciences, v . 34, p. 504-520, https:// doi .org /10 .1 139 /e17 -041.Ga Midcontinent rift system basalts: Implications for multiple mantle sources during rift development: Canadian Journal of Earth Sciences, v . 34, p. 504-520, https:// doi .org /10 .1 139 /e17 -041.This paper presents a suite of two-dimensional mathematical models of basin-scale groundwater flow and heat transfer for the middle Proterozoic Midcontinent Rift System. The models were used to assess the hydrodynamic driving mechanisms responsible for main-stage stratiform copper mineralization of the basal Nonesuch Formation during the post ...The midcontinent rift system did not, in the end, play a major role in the evolution of the continent, because the rifting stopped---or was stopped-more or less abruptly. The rift system's rocks date from 1.108 to 1.086 billion years BP, so the rifting lasted 22 million years---not much by comparison with the Atlantic Ocean, but (to date ...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 ~1.1 Ga Midcontinent Rift (MCR), the 3000 km long largely buried feature causing the largest gravity and magnetic anomaly within the North American craton, is traditionally considered a failed rift formed by isolated midplate volcanism and extension. ... Although similar rift systems existed earlier in the geologic record, it is harder to ...Seismic-reflection data were collected in the 1980s as part of the Great Lakes International Multidisciplinary Program on Crustal Evolution (GLIMPCE) to investigate the 1.1 Ga Midcontinent Rift System (MRS). GLIMPCE Line C crosses western Lake Superior from north to south shores (Fig. 1 inset). Many previous workers have interpreted the MRS in Line C as an asymmetric central graben filled with ...New teleseismic data and images have prompted new models for the evolution of the Midcontinent rift system (Zhang et al., 2016; Stein et al., 2018; Bollmann et al., 2019) and an increasing ...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 a short span of less than 20 m.y. The MCR is a profound disruption of the crust, as indicated by its anomalous geophysical signatures.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 .The last developmental phase of the Midcontinent rift system, from 1.060 to 1.040 Ga, was characterized by a regional compressional event likely caused by continental collision along the Grenville ...THE MIDCONTINENT RIFT SYSTEM | Annual Review of Earth and Planetary Sciences. Publications A-Z. Journal Information. About. Subscribe. Give. Home. Annual Review of Earth and Planetary Sciences. Volume 13, 1985. the Midcontinent rift system can be explained well by postu- lating that it was underlain by a mantle plume at the time of rifting (Hutchinson et al. 1990; ...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 rift extend to the ...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 (MCRS) is a 1.1 billion-year-old failed rift system that spans much of the North American continental interior. The MCRS is exposed at Lake Superior and is buried in the subsurface along its southwest-extending arm through southeastern Nebraska. Due to the presence ofThe 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 ...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 (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 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 ...Pieter Berendsen, 1997. "Tectonic evolution of the Midcontinent Rift System in Kansas", Middle Proterozoic to Cambrian rifting, central North America, Richard W. Ojakangas, Albert B. Dickas, John C. GreenThe 1.1 Ga Midcontinent Rift of North America is a failed intraconti-nental rift that was active for ~25 m.y. Paleomagnetic and geochronologic data from Midcontinent Rift volcanic rocks have yielded a well-resolved apparent polar wander path (APWP) known as the Keweenawan Track,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 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.The mineral system approach considers the origin of these deposits in the framework of lithospheric-scale processes from the time-honoured perspective of source, fluids, transport and traps. ... Nd, O and S isotope constraints on country rock contamination in the conduit-related Eagle Cu-Ni-(PGE) deposit, Midcontinent Rift System, upper ...The Midcontinent Rift System Figure 2. Generalized map of the western Lake Superior region showing the distribution of major rock types of the Midcontinent rift and locations of known Ni-Cu sulfide mineralization in Minnesota and Wisconsin.S-to-P receiver functions constrain a Moho, crustal underplating and midlithosphere discontinuities beneath the Midcontinent Rift; The Moho and crustal underplating directly beneath the rift axis vary in character from north to south; Midlithospheric discontinuities predate the rifting event and seem unperturbed by rift-related activityOne of EarthScope's major targets is the Midcontinent Rift (MCR), a 1.1 billion-year-old scar along which the continent started to split, just as Africa is rifting today along the East African Rift, but failed to form a new ocean. Although the rift's volcanic rocks and sediments outcrop near Lake Superior, its arms are buried under thick sediment.Vol. 52, No. 4 | www.rmag.org 49 THE MOUNTAIN GEOLOGIST | October 2015 poSt-MiSSiSSippian tectonic evolution oF the neMaha tectonic Zone and Midcontinent riFt SySteM, Se neBraSka and n kanSaS Figure 1. Map of Precambrian features in the study area, and locations of the cross-sections used in the study (after Dicken et al., 2001The Midcontinent rift system (MCR) is a 2,000 km long arc-shaped feature extending from Kansas to Michigan via Lake Superior. The MCR is responsible for the most prominent gravity feature in North America and is 1.11--1.09 Ga in age. The purpose of this paper is to discuss possible southern extensions of the MCR.Th e Midcontinent Rift System (e.g., Stein et al. 2016), which stretches from Lake Superior into southeastern Nebraska and Kansas, and is an old geologic structure that is now completely buried by ...The best wedge issue is an actual wedge. |< <? > >| Archive; What If? AboutThe mineral system approach considers the origin of these deposits in the framework of lithospheric-scale processes from the time-honoured perspective of source, fluids, transport and traps. ... Nd, O and S isotope constraints on country rock contamination in the conduit-related Eagle Cu-Ni-(PGE) deposit, Midcontinent Rift System, upper ...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.The Midcontinent Rift System (MRS) is an approximately 2,200 km curvilinear Mesoproterozoic rift that stretches from Kansas northeast to the Lake Superior region where it turns southeast and extends through lower Michigan. Although rocks of the MRS are largely buried beneath younger rocks except around the margins and on islands of Lake ...Enter the email address you signed up with and we'll email you a reset link.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 ...Abstract. 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 ...Publisher Summary. This chapter discusses the Midcontinent Rift system (MCR). The majority of the rift's igneous rocks are derived from a melting mantle plume …the southern margin of the Midcontinent Rift system in western lake Superior: Tectonics 9, 303-310. VOLCANIC ROCKS OF THE MIDCONTINENT RIFf SYSTEM: A REVIEW 67 Hutchinson D.R., White, R.S., Cannon, W.F. and Schulz, K.J. (1990), Keweenaw hot spot: Geophysical evidence for a 1.1 Ga mantle plume beneath the Midcontinent Rift System. ...THE MID-CONTINENT RIFT ZONE. On the southern margin of what is today the Canadian Shield a split, or rift occurred about 1.1 Ga (billion years ago). This is called the Keweenawan Rift, or mid-continent rift system (see below). In sum, it opened, filled with up to 15 km of lavas (which solidified into a rock called basalt), and then the rifting ...To the north and west of New Madrid's jagged Reelfoot Rift is the much larger and even more unthinkably ancient Midcontinent Rift, formed more than a billion years ago when there was nothing ...North America's failed 1.1 Ga Midcontinent Rift (MCR) is one of the best preserved intra-continental rift systems of late Mesoproterozoic age (Wold and Hinze, 1982;Green, 1983; Van Schmus and ...Precise resolution of the timing of igneous activity is crucial to understanding the dynamic processes associated with continental rifting. 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 …The Midcontinent Rift System (MRS) of North America is one of the world’s largest continental rifts and has an age of 1.1 Ga (giga-annum). The MRS 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. As part of the construction of a database …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 …Seismic-reflection data were collected in the 1980s as part of the Great Lakes International Multidisciplinary Program on Crustal Evolution (GLIMPCE) to investigate the 1.1 Ga Midcontinent Rift System (MRS). GLIMPCE Line C crosses western Lake Superior from north to south shores (Fig. 1 inset). Many previous workers have interpreted the MRS in Line C as an asymmetric central graben filled with ...The Tamarack Intrusive Complex (TIC, 1105.6 ± 1.2 Ma) in NE Minnesota, was emplaced during the early stages of the development of the Midcontinent Rift System (MRS, "Early Stage": 1110-1106 Ma).Country rocks of the TIC are those of the Paleoproterozoic Thomson Formation, part of the Animikie Group including sulfide-bearing metasedimentary black shale.Volcanism within the North American Midcontinent Rift between ca. 1109 and 1083 Ma, as well as other contemporaneous volcanism within Laurentia, has provided an opportunity to develop extensive paleomagnetic data sets spanning this time period. ... Abstract The 1.1 Ga Midcontinent Rift System (MRS) of North America comprises a series of ...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.Jan 25, 2018 · 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 began to split along the margin of the Superior craton. 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 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.The Keweenaw fault system along Lake Superior’s south shore in Michigan, USA is one of the most significant fault systems associated with North America’s Midcontinent Rift System. Reverse slip has thrust Portage Lake Volcanics (ca. 1.1 Ga) southeastward over Jacobsville Sandstone (ca. 1.0 Ga).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 ...Abstract. Two prominent Precambrian geologic features of central North America are the Midcontinent Rift (MCR) and Grenville Front (GF). The MCR, an extensive band of buried igneous and sedimentary rocks outcropping near Lake Superior, records a major rifting event at ca. 1.1 Ga that failed to split North America.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 …[Show full abstract] northeastern Kansas is an area of elevated seismic risk, with a spatial relationship to the Nemaha Tectonic Zone and the Midcontinent Rift System. Using sequential ...Thor Volcanic Group of the Midcontinent Rift System. Most solid lines around and within the MRS mark faults rather than lithologic contacts. Precambrian geology modified from Anderson (1988; 1992). of the well and as deep below the Precambrian surface as possible in order to avoid surface samples that have been strongly weathered.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 ...One notable example of a failed rift elsewhere on the globe is the Midcontinent Rift, which curves for about 1,900 miles (3,000 km) across the Upper Midwest of North America, according to a 2022 ...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).True amplitude processing of The Great Lakes International Multidisciplinary Program on Crustal Evolution seismic reflection data from the Midcontinent Rift System of North America shows large differences in the reflectivity of the Moho transition zone beneath the axial rift, beneath the rift flanks, and outside of the rift. The Moho reflection from the axial rift has a discontinuous, diffractivePlot of La/Sm versus εNd(1100 Ma), highlighting similarities system, creating a depression into which the delta was de- between rocks from the Osler Group and those from other volcanic posited. and intrusive sequences from the margins of the Midcontinent Paleocurrent indicators in all these units show flow to the Rift.The midcontinent rift system is a 2200-km-long segmented continental rift of Keweenawan age (approximately 1.1 Ga) that extends as an arcuate belt from central Kansas, north through the Lake Superior region, and south-easterly to Ohio where it terminates within the Grenville Front tectonic zone (Van Schmus 1992; Cannon 1994; Hinze et al. 1997 ...In the United States, the Duluth Complex in Minnesota, comprised of a group of mafic intrusions related to the 1.1 Ga Midcontinent Rift system, represents a major Ni resource of 8 Mt Ni, but deposits generally exhibit low grades (0.2 percent Ni, 0.66 percent Cu) and remain in the process of being proven economic.Keweenawan Supergroup. The Keweenawan Supergroup is a supergroup of volcanic and sedimentary rocks that fill the Midcontinent Rift System in the U.S. states of Michigan, Wisconsin, and Minnesota. [1] [2] It is about 30 kilometers (19 mi) thick and it formed about 1.1 billion years ago. [3]Nov 21, 2018 · The Midcontinent Rift System is a 1,500-km (900-mi) long Middle Proterozoic aborted rift extending from the Lake Superior region southwestward into Kansas (Sims, 1990). The rift can be divided into three distinct segments (Dickas and Mudrey, 1989) separated from each other by accommodation structures. 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 ...The prerift crust, however, was thinned 25-30 km beneath the central rift (compared with its flanks), providing evidence for crustal extension by factors of about 3-4. The Midcontinent rift system differs from Phanerozoic rifts in having total crustal thicknesses equal to or greater than the surrounding (presumably unextended) regions.Green, J.C., 1983, Geologic and geochemical evidence for the nature and development of the Middle Proterozoic (Keweenawan) midcontinent rift ofNorthJul 10, 1990 · 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 ... The midcontinent rift system did not, in the end, play a major role in the evolution of the continent, because the rifting stopped---or was stopped-more or less abruptly. The rift system's rocks date from 1.108 to 1.086 billion years BP, so the rifting lasted 22 million years---not much by comparison with the Atlantic Ocean, but (to date ...The resistivity signature of the 1.1 Ga Mid-continent Rift System is examined in detail, in particular as relates to rift geometry, extent, and segmentation. An unrecognized expanse of (concealed) Proterozoic deltaic deposits in Kansas is identified and speculated to result from axial drainage along the southwest rift arm akin to the Rio Grande ...The 1.1 Ga Mid-Continent rift system extends from Kansas through the Lake Superior region and into southern Michigan. The rift is filled with thick sequences of basalt and clastic sedimentary rocks, which are now mostly buried beneath Paleozoic rocks. Rocks of the rift system are exposed only in the Lake Superior region and comprise the ...The Midcontinent Rift System (MRS) of North America is one of the world’s largest continental rifts and has an age of 1.1 Ga (giga-annum). The MRS 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. As part of the construction of a database …Master of ScienceDepartment of GeologyKarin GoldbergThe Midcontinent Rift System (MRS) formed a half-graben that extends into NE Kansas. The Precambrian rift succession, penetrated by Texaco Noel Poersch#1 (NP#1) well in Washington Co. at depthsAbstract. A variety of data have been compiled in eastern Nebraska and adjacent areas that are pertinent to understanding the complex Precambrian history of the Midcontinent USA. Petrographie analysis has been done for samples from wells penetrating the Precambrian surface. Chemical analysis is available for rock types such as rift basalt ...The Middle Proterozoic Midcontinent Rift System (MRS) of North America is a failed rift that formed in response to region-wide stresses about 1,100 Ma. In Iowa, the MRS is buried beneath 2,200?3,500 ft of Paleozoic and Mesozoic sedimentary rocks and Quaternary glaciogenic deposits. An extremely large volume of sediments was deposited within basins associated with the rift at several stages ...The Midcontinent rift System was imposed upon and reflects the pre-existing tectonic grain of the older basement. This correspondence of the trends of the Rift segments with older tectonic zones has been noted by Klasner et al. (1982), Carlson (1988a and 1988b) and Sims (1990). On the western limb of the Rift, the Lake Superior segment lies ...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.The Mid-Continent rift system can be traced by the Mid-Continent gravity high and corresponding aeromagnetic anomaly signature from the surface exposure of the Keweenawan Supergroup in the Lake Superior basin southwest in the subsurface through Wisconsin, Minnesota, Iowa, Nebraska, and Kansas. The aeromagnetic anomaly signature of the rift ...The Mesoproterozoic Midcontinent Rift System (MRS), formed about 1.1 Ga, is a large arcuate structure located in central North America. It is the most striking anorogenic geologic feature observed within the Precambrian basement rocks forming the North American craton. Moreover, it numbers among the world's greatest continental rifts and is ...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 ...Geophysical investigations and crustal structure of the North American Midcontinent Rift systemThe 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.rocks of the Midcontinent Rift System (MRS). The MRS is a failed rift, a great rip through the earth's crust, that stretches for a thousand miles from eastern Lake Superior, across the center of Iowa, and south into Kansas (Fig. 1). The rift formed about 1.1 billion years ago, and had it continued to spread, it would have formed a new ocean.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 (~1.1 Ga) North American Midcontinent Rift System (MRS) has been of widespread interest to researchers studying its economic mineral deposits, continental rifting processes, and the evolution of early terrestrial life and environments. For their age, the MRS rocks are well preserved and have not been deeply buried, yet a thorough understanding of the regional thermal ...Compressional-wave seismic velocity (velocity) and bulk density (density) data were compiled from published sources for rock suites and earth materials that are significant for geophysical modeling of the Mesoproterozoic Midcontinent Rift System in the Lake Superior region. The data include laboratory measurements of outcrop and drill core samples, seismic refraction studies, and a sonic log .... The Midcontinent Rift is an ancient rift system that could hMar 7, 2023 · Prominent examples of rift failure include American Midcontinent rift system (fig. 1) have a potential for producing hydrocarbons. They base their speculations on comparisons with hydrocarbon potential of present-day rift basins and on known occurrences of organic- matter-rich rocks in the Nonesuch Shale of the Oronto Group in northern Michigan. To the north and west of New Madrid's jagged Reelfoot Rif Failed rifting of the North American craton in the Mesoproterozoic left the Midcontinent Rift system (Stein et al., 2016, Van Schmus and Hinze, 1985), and disintegration of the Rodinia supercontinent in the Neoprotozoic left the Reelfoot rift and other rift systems near the eastern margin of the North American continent (Johnston and Kanter ... Transcript[ edit] [A map of North America shows the Midconti...

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