Midcontinent rift system
The Nonesuch Formation, a black siltstone, was deposited in the Lake Superior portion of the mid-continent rift system during middle Proterozoic rifting. Despite its age of nearly 1.1 Ga, the Nonesuch Formation contains liquid petroleum and solid pyrobitumen. Numerical modeling techniques were used in this study to constrain the thermal history ...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. Arkose and subarkose with minor siltstone and ...
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The Keweenaw fault is perhaps the most significant fault associated with the Midcontinent Rift System of the north-central United States. The fault, parallel to the south edge of the rift, has ...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 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.
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).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.Midcontinent Rift System. Keweenawan. North America. Precambrian. Proterozoic. Middle Proterozoic. Natural Resources Research Institute. NRRI. University of Minnesota Duluth. UMD. Appears in collections Technical Reports [503] Series/Report Number. NRRI Technical Report; NRRI/TR-95/33. Description.The Midcontinent Rift System (MRS) (sometimes referred to as the Central North American Rift System or Midcontinent Gravity High) has long been recognized from geophysical mapping to trend south-southwestward from Lake Superior into central Kansas in a snake-like curving pattern. Faults of this zone trend north-northeast-southsouthwest …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 ...
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 ...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...…
Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. The Midcontinent Rift's present structure results from th. Possible cause: Between 1091 and 1098 Ma, most of a 15- to 20-km thick...
However, an unusual example of porphyry copper mineralization occupying an intra-plate setting has also been reported at Jogran near Mamainse Point on the eastern shore of Lake Superior in southern Ontario, Canada, where it is associated with the North American Midcontinent rift system (Fig. 1a, b, Giblin, 1966, Blecha, 1974, Armbrust, …Some mafic-ultramafic intrusions in the North American Midcontinent Rift System host disseminated to massive sulfides of magmatic origin. Massive sulfides are also present in the immediate sedimentary country rocks to some of these intrusions, such as Partridge River, Tamarack, and Eagle. Our working hypothesis is that the country rock-hosted massive sulfides are also of magmatic origin.
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 ...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 ...Rift-wid e correlation of 1.1 Ga Midcontinent Rift System basalts: Implications for multiple sources during rift development. Canadian Journal of Earth Sciences , 34 (4), 504 - 520. https://doi ...
marcie miller Sulfide accumulations range from disseminated at both Eagle and East Eagle to semimassive and massive at Eagle. U-Pb baddeleyite dating gives a crystallization age of 1107.2 ± 5.7 Ma for the Eagle intrusion, coeval with eruption of picritic basalts at the base of the volcanic succession in the Midcontinent Rift System (MRS). carlyjbwhat is paleozoic era Generalized geology of the Lake Superior region with Midcontinent Rift-related intrusions, showing the location of the Tamarack intrusion, the Eagle intrusion, and the Duluth Complex relative to ...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., 2001 tarc inc 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 Paleoproterozoic (2.5-1.7 Ga) Midcontinent rift system of the northeastern Fennoscandian Shield V. F. Smolkin. V. F. Smolkin Search for other works by this author on: ... Varzuga belt is an intracontinental paleorift system formed during four stages: prerifting (2.55-2.30 Ga), early rifting (2.30-2.20 Ga), late rifting (2.20-1.95 Ga ... will stevens baseballspectrum outages kingston nycraigslist moving boxes near me 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, diffractiveVolcanism in the Midcontinent rift system lasted between 1108 and 1086 Ma. Rates of flood-basalt eruption and subsidence in the western Lake Superior region appear to have been greatest at the ... craigslist mio mi The Duluth Complex (Minnesota, USA) is one of the largest mafic intrusive complexes on Earth. It was emplaced as the Midcontinent Rift developed in Laurentia's interior during an interval of magmatism and extension from ca. 1109 to 1084 Ma. This duration of magmatic activity is more protracted than is typical for large igneous provinces interpreted to have formed from decompression melting ...Some mafic–ultramafic intrusions in the North American Midcontinent Rift System host disseminated to massive sulfides of magmatic origin. Massive sulfides are also present in the immediate sedimentary country rocks to some of these intrusions, such as Partridge River, Tamarack, and Eagle. Our working hypothesis is that the country rock-hosted massive sulfides are also of magmatic origin. To ... meet forumsmilitary eibonline mba programs requirements 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 ...Midcontinent Rift System. Keweenawan. North America. Precambrian. Proterozoic. Middle Proterozoic. Natural Resources Research Institute. NRRI. University of Minnesota Duluth. UMD. Appears in collections Technical Reports [503] Series/Report Number. NRRI Technical Report; NRRI/TR-95/33. Description.