Midcontinent rift system

Rocks related to the ~1.1 Ga Midcontinent Rift

Two prominent Precambrian features of central North America (Fig. 1) record opposite ends of the Wilson cycle.One, the Midcontinent Rift (MCR), is a 3000-km long horseshoe-shaped band of more than 2 million km 3 of buried igneous and sedimentary rocks that outcrop near Lake Superior (Ojakangas et al., 2001; S. Stein et al., 2018).To …The U.S. Department of Energy's Office of Scientific and Technical InformationAs in the East African rift system, there was an interval of plateau volcanism followed by rift basin development in the Midcontinent Rift (Woodruff et al., 2020). Similar to modern-day East ...

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The Midcontinent Rift System: A major Proterozoic continental rift Author(s) ... John Mariano, 1997. "The Midcontinent Rift System: A major Proterozoic continental rift", Middle Proterozoic to Cambrian rifting, central North America, Richard W. Ojakangas, Albert B. Dickas, John C. Green. Download citation file: Ris (Zotero) Refmanager;Previous Cu isotope work has documented a clear disparity between d65Cu values of sheet-style (-0.5 to 0.5‰) and conduit-style (0.5-2.0‰) intrusions associated with the Midcontinent rift system.Collaborative Research: Geophysical Investigation of the Mid-Continent Rift System. NSF Org: EAR Division Of Earth Sciences: Awardee: UNIVERSITY OF OKLAHOMA: Initial Amendment Date: September 24, 2012: Latest Amendment Date: September 18, 2014: Award Number: 1147761: Award Instrument:The Midcontinent Rift System magmatism and rifting thought to have been initiated by plume upwelling followed by passive upwelling of locally available asthenosphere (Berg and Klewin, 1988, Nicholson and Shirey, 1990, Klewin and Berg, 1991, Shirey, 1997). Given the timing of the Eagle magmatism and its light REE enriched and picritic nature ...The Midcontinent Rift System (MRS) is a Late Mesoproterozoic (∼1.1Ga) sequence of volcanic and sedimentary rocks exposed in the Lake Superior Region of North America. The MRS continues to be the ...Between 1091 and 1098 Ma, most of a 15- to 20-km thickness of dominantly tholeiitic basalt erupted in the Midcontinent Rift System of the Lake Superior region, North American. The Portage Lake Volcanics in Michigan, which are the youngest MRS flood basalts, fall into distinctly high- and low-TiO{sub 2} types having different liquid lines of ...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 ...Ni-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 ...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...A 70‐km‐long seismic reflection profile in western Michigan provides new insight into the nature, distribution, and structure of the Keweenawan Supergroup volcanic and overlying sedimentary rocks and the controversial Keweenaw fault along the southern boundary of the Midcontinent Rift System in the Lake Superior basin. Interpretation of the 5‐s reflection data constrained by surface ...The fracture pattern of north-central Kansas and its relation to hydrogen soil gas anomalies over the midcontinent rift system. Imprint July, 1988. Physical description 112p.: maps, tables, rose-diagrams ; 28 cm. Series Open-file report (Kansas Geological Survey) ; 88-25 Available onlineThe Mid-continent rift system can be traced by the Mid-continent geophysical anomaly (MGA) from the surface exposure of the Keweenawan Supergroup in the Lake Superior basin southwest in the subsurface through Wisconsin, Minnesota, Iowa, Nebraska, and Kansas. Outcrop and well penetrations of the late rift Keweenawan sedimentary rocks reveal ... Keweenawan System, division of late Precambrian rocks and time in North America (the Precambrian began about 4.6 billion years ago and ended 542 million years ago). Rocks of the Keweenawan System are about 10,700 metres (about 35,000 feet) thick, overlie rocks of the Huronian System, and underlie.The Keweenawan Midcontinent rift system was imposed upon the terrane suture in our study area at ca. 1100 Ma. This event nearly separated the ancient continent and imparted enormous volumes of mafic magma to various depths in the crust (Hinze et al., 1997; Nicholson et al., 1997; Vervoort et al., 2007; Stein et al., 2015), engendering numerous high-grade base and precious metal deposits ...Previous Cu isotope work has documented a clear disparity between d65Cu values of sheet-style (-0.5 to 0.5‰) and conduit-style (0.5-2.0‰) intrusions associated with the Midcontinent rift system.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 ...A geophysical profile of the southern margin of Midcontinent Rift System named the East C Objective: to test geophysical interpretations of the Proterozoic geology in northeastern Iowa by: 1) drilling a scientific borehole through Paleozoic cover to Proterzoic basement, 2) recover core from the Proterozoic basement sufficient for petrologic and radiometric analyses, and 3) obtain data on the overlying Paleozoic section to improve und... The Midcontinent rift system is a 1.1-b.y.-old structure ex 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 …Rocks related to the ~1.1 Ga Midcontinent Rift System (MRS) are exposed in the Lake Superior region, where they host several different types of large metallic mineral deposits (e.g., Nicholson et al., 1992, Miller and Nicholson, 2013).Where exposed, the rocks, structure, and mineral potential of the MRS have been studied in detail for several decades. A map of the Midcontinent rift system, a g

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.Between 1091 and 1098 Ma, most of a 15- to 20-km thickness of dominantly tholeiitic basalt erupted in the Midcontinent Rift System of the Lake Superior region, North America. The Portage Lake Volcanics in Michigan, which are the youngest MRS flood basalts, fall into distinctly high- and low-TiO 2 types having different liquid lines of descent ...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, Michigan, Wisconsin, Iowa, Nebraska, and Kansas is inferred from gravity and magnetic data.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 Fracture Pattern of North-central Kansas and Its Relation to Hydrogen Soil Gas Anomalies Over the Midcontinent Rift System Volume 88, Issue 25 of Open-file report: Authors: Kansas Geological Survey, Scott Kenneth Johnsgard: Publisher: University of Kansas, Geology, 1988: Length: 112 pages : Export Citation: BiBTeX EndNote RefManPseudosections of magnetotelluric (MT) responses for the eight high-frequency controlled-source audio (CSA) MT soundings plus the 14 wideband MT soundings across the Midcontinent rift system and ...…

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. The mesoproterozoic midcontinent rift system, Lake Superior regi. Possible cause: The Middle Proterozoic Midcontinent Rift System is one of the world'.

The volcanic rocks are remnants of what is called the Midcontinent Rift, and it is an enormous geological puzzle. Rifts are wounds in Earth's outer layer that can grow …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 (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.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 (MRS; Wold and Hinze, 1982 The 1100 Ma Midcontinent rift system of North America is one of the world's great igneous provinces, containing over one million km of mafic volcanic and plutonic rocks. Volcanic rocks range from picrite to rhyolite, although tholeiitic basalt predominates. Plutonic rocks range from peridotite to granite, with plagioclase-rich gabbros and ... The U.S. Department of Energy's Office of ScMidcontinent Rift. The Midcontinent Rift (MCR), a 3 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 ... The Mid-continent rift system can be traced by the Mid- 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 depths12 Şub 2021 ... geological rift in the center of the North American continent. In more languages. Spanish. No label defined. No description defined. Geophysical investigations and crustal structure of the North AmericaAug 11, 2023 · The Midcontinent Rift System (MRS) or KeweenawanExplore the United States' Mountain region and its divers They are essential for the U.S. economy; however the U.S. imports about 90 percent of the platinum-group elements that we need to use. The project objective is to assess the Duluth Complex and related mafic-ultramafic intrusions in the 1.1 Ga Midcontinent Rift System in the Lake Superior region. Our current activities focus on a Keweenawan... The Midcontinent rift system is a 1.1-b.y. Midcontinent Rift. The Midcontinent Rift (MCR), a 3000-km-long band of more than 2 million km 3 of buried igneous and sedimentary rocks that outcrop near Lake Superior, has been extensively studied, as reviewed by Ojakangas et al. (2001) and S. Stein et al. (2018). To the south, it is buried by younger sediments, but easily traced because the ... The Middle Proterozoic Midcontinent Rift System[The U.S. Department of Energy's Office of Scientific and TeExposures in the Lake Superior region, an The Midcontinent Rift System May 1985 Annual Review of Earth and Planetary Sciences DOI: 10.1146/annurev.ea.13.050185.002021 Authors: W. Randall …