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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 review by Ripley, 2014).Disseminated sulfide mineralization occurs within multiple, sheet-like intrusions that comprise a large portion of the Duluth Complex.This view of the rift system's evolution is compatible with the rift being part of an evolving plate boundary system rather than an isolated episode of midplate volcanism. Citation: Merino, M., G. R. Keller, S. Stein, and C. Stein (2013), Variations in Mid-Continent Rift magma volumes consistent with microplate evolution, Geophys. Res.Feb 24, 2015 · 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. Abstract: 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 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.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 ...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 ...North America's Midcontinent Rift (MCR) is an unusual combination, because its 3000-km length formed during a continental breakup event 1.1 Ga, but it contains an enormous volume of igneous rocks that are mostly flood basalt.@article{osti_6119476, title = {Petroleum potential of Precambrian Nonesuch Formation, Mid-Continent rift system}, author = {Hieshima, G B and Zaback, D A and Pratt, L M}, abstractNote = {The Precambrian Nonesuch Formation crops out in northern Wisconsin and Michigan and is recognized as a possible petroleum source rock based on active oil seeps in copper mines of the White Pine area.Thorleifson, L. H., ed., 2008, Potential capacity for geologic carbon sequestration in the Midcontinent Rift System in Minnesota, Minnesota Geological Survey ...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 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 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 northern Great Lakes region of North America. Previous workers have commonly used seismic-reflection data (Great Lakes International Multidisciplinary Program on Crustal Evolution [GLIMPCE] line A) to ...The major rift-bounding structure on the west side of the Midcontinent Rift System in Kansas is referred to as the Peace Creek Tectonic Zone (fig. 1; Berendsen and Blair, 1986). It is recognizable in the subsurface in southern Kansas, but cannot be mapped into the Salina basin, because of the paucity of available data.Specifically, the earthquakes are occurring on a compressional left stepover within a right-lateral strike-slip fault system (Russ, 1982; Schweig and Ellis, 1994). ... MCR—Midcontinent Rift, MGL—Missouri gravity low, RR—Reelfoot rift, SFM—St. Francois Mountains. Dashed line extending from Texas to Ontario represents inferred eastern ...MCRS marks the Mid Continent Rift System and NTZ marks the Nemaha Tectonic Zone. NBF is the Northern Bounding Fault and UF is the Union Fault. In (a) the dashed lines indicate the other named ...The Texaco 1 Poersch well in Kansas (11,300 ft TD) was the first significant exploration test of the Mid-Continent Rift System (MRS). An upper succession of rift-related rocks (2846-7429 ft) contains approximately 90% mafic igneous rocks with minor pegmatites and 10% oxidized siltstone and arkose.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.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 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 …The Nebraska segment of the Mid-Continent Rift System parallels fabrics within the earlier Central Plains Orogen . In the southern part of the study area, within eastern Kansas, the Mid-Continent Rift System is cut by a series of NW-SE trending dextral strike-slip faults, on which there have been historical earthquakes [39,40].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 major rift-bounding structure on the west side of the Midcontinent Rift System in Kansas is referred to as the Peace Creek Tectonic Zone (fig. 1; Berendsen and Blair, 1986). It is recognizable in the subsurface in southern Kansas, but cannot be mapped into the Salina basin, because of the paucity of available data.Aug 11, 2023 · The 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 Precambrian, about 1.1 billion years ago. The rift failed, leaving behind ... Oct 30, 2015 · 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 review by Ripley, 2014). Disseminated sulfide mineralization occurs within multiple, sheet-like intrusions that comprise a large portion of the Duluth Complex. Abstract. 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 Mid-Continent Rift System (MCR) is a 1.03 to 1.16 Gya rift structure running across the North American continent. During this time North America began to split apart in a similar manner as the East African Rift (EAR) is splitting apart today. The MCR was not successful and North America remained intact. The rift falls somewhere in ...1 Introduction [2] The Mid-Continent Rift System (MCRS) is one of the most prominent features on the Bouguer gravity map of the central United States (Figure 1).The rift formed at ~1.1 Ga, recorded by two pulses of magmatic activity lasting ~15 Myr [White, 1997], making it one of the most extensive paleorifts in the world [Hinze et al., 1997].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 …Figure 1: The CO2 system of the atmosphere, the ocean, and its sediments. The equilibrium between CO2 gas in the atmosphere and dissolved aqueous CO2 in seawater is set by K0, the Henry's law constant...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.RESEARCH. Architecture of the hidden Penokean terrane suture and Midcontinent rift system overprint in eastern Minnesota and western Wisconsin from magnetotelluric profiling. R.L. Wunderman1,*, P.E. Wannamaker2,†, and C.T. Young1,§ 1DEPARTMENT OF GEOLOGICAL AND MINING ENGINEERING AND SCIENCES, MICHIGAN TECHNOLOGICAL UNIVERSITY, 1400 TOWNSEND DRIVE, HOUGHTON, MICHIGAN 49931, USA 2ENERGY ...2. Simplified map of the Midcontinent Rift defined from gravity sur­ veys 4 3. Detailed structural interpretation of the Superior Zone of the Mid-continent Rift System 5 4. General geology of the western Lake Superior Basin part of the Mid-continent Rift System 6 5. General stratigraphic section in the western part of the Lake Superior Basin 7THE 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.DeGraff, J. M. & Carter, B. T. Detached structural model of the Keweenaw fault system, Lake Superior region, North America: Implications for its origin and relationship to the Midcontinent Rift ...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 review by Ripley, 2014).Disseminated sulfide mineralization occurs within multiple, sheet-like intrusions that comprise a large portion of the Duluth Complex.Rift-wide correlation of 1.1 Ga Midcontinent rift system basalts, implications for multiple mantle sources during rift development Can. J. Earth Sci. , 34 ( 1997 ) , pp. 504 - 520 CrossRef View in Scopus Google ScholarThorleifson, L. H., ed., 2008, Potential capacity for geologic carbon sequestration in the Midcontinent Rift System in Minnesota, Minnesota Geological Survey Open File Report OFR-08-01, 138 p. Series/Report NumberAug 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. Jun 15, 2020 · 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. It is the most prominent feature of gravity and magnetic anomaly maps of ... The U.S. Department of Energy's Office of Scientific and Technical InformationNi-Cu-PGE sulfide mineralization in the Midcontinent rift system can be broadly classified into three types: (1) disseminated sulfide mineralization found within gabbroic to troctolitic sheet-like intrusions; (2) disseminated through massive sulfide occurrences associated with smaller, early rift, mafic to ultramafic intrusions that are conduit-related, and (3) relatively low sulfide, PGE ...The Midcontinent Rift's present structure results from the combined effects of a sequence of rifting, volcanism, sedimentation, subsidence, compression, erosion, and any later effects (Stein et al., 2015; S. Stein et al., 2018). The large positive gravity anomalies along the MCR primarily reflect the large volume of high-density igneous rocks ...The 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 Precambrian , about 1.1 ...A Thesis submitted to the faculty of the Graduate School of the University of Minnesota by Thomas John Suszek in partial fulfillment of the requirements for the degree of Master of Science, June 1991.rocks of the northern part of the Midcontinent Rift System E8 E4. Triangular diagram showing petrographic composition of Precambrian sedimentary rocks of the northern part of the Midcontinent Rift System based on the composition of their constituent rock fragments E10 E5. Generalized geologic map showing the subsurface distribution of Keweenawan Collaborative Research: Geophysical Investigation of the Mid-ContinenTHE MIDCONTINENT RIFT SYSTEM W. R. Van Schmus Depar 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. MCRS marks the Mid Continent Rift System and NTZ marks the Nemaha Tectonic Zone. NBF is the Northern Bounding Fault and UF is the Union Fault. In (a) the dashed lines indicate the other named ... The East Continent Rift Basin (ECRB) is a newly recognized, d 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 ... The Mesoproterozoic Midcontinent Rift System (MRS), formed about 1...

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As summarized in several reviews (e.g., Van Schmus and Hinze, 1985, Hinze et al., 1997, Ojakangas...

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The 1.1 Ga Mid-Continent rift system extends from Kansas through the Lake Superior region and...

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The failed rift, known as the Midcontinent Rift, occurred about 1.1 billion years ago, and underlies Lake Superior and much of Iowa, ...

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General Information. Title: Precise U-Pb ages of Duluth Complex and related mafic intrusions, northeastern ...

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The Midcontinent rift system is a 1.1-b.y.-old structure extending from Kansas, through the Lake Superior region, and i...

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