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Topic: Sevier orogeny

	Orogeny - Wikipedia, the free encyclopedia
		Frequently, rock formations that undergo orogeny are severely deformed and undergo metamorphism.
		During orogeny, deeply buried rocks may be pushed to the surface.
		Alice Springs orogeny in central Australia during the Early Carboniferous.
	en.wikipedia.org /wiki/Orogeny (448 words)

	Sevier Orogeny
		Sevier deformation has been described primarily in western Utah and was extended by various early workers into the eastern and southern portions of Nevada.
		Total tectonic shortening across the Sevier belt is estimated at perhaps 40 to 60 miles, with individual major thrusts commonly displaying 10 to 20 miles of displacement (Armstrong, 1963).
		It appears that much of northeastern Nevada is within the hinterland of the Sevier belt and retains little of the compressional Mesozoic overprint obvious to the southeast in western Utah and southern Nevada.
	www.westerncordillera.com /sevier_orogeny.htm (451 words)

	Laramide orogeny - Wikipedia, the free encyclopedia
		The Laramide orogeny was a 30 million year period of mountain building in western North America, which started in the Late Cretaceous, 70 million years ago, and ended in the Late Paleogene, 40 million years ago.
		The major feature that was created by this orogeny was the Rocky Mountains, but evidence of this orogeny can be found from Alaska to northern Mexico, with the easternmost extent of the mountain-building represented by the Black Hills of South Dakota.
		Compare the earlier Sevier orogeny and the still-earlier Nevadan orogeny of the late Jurassic — early Cretaceous.
	en.wikipedia.org /wiki/Laramide_orogeny (422 words)

	[No title]
		~Nevadan The Nevadan Orogeny is characterized by granite intrusions.
		~Nevadan The Nevadan Orogeny occurred in the Jurassic and is the oldest of the group.
		~Sevier The Sevier Orogeny occurred during the Cretaceous Period and is the second oldest of the group.
	www.usd.edu /exam/backup/hist2.txt (1754 words)

	Bryce Canyon (Site not responding. Last check: 2007-11-05)
		This Sevier orogeny was most active during late Cretaceous times, and it caused subsidence of the foreland basin to its east, deepening the waters of the interior seaway.
		The Laramide orogeny began to form the present day Rocky Mountains, and by about 60 million years ago, the region of southern Utah that is now Bryce Canyon was covered by an extensive system of marine lakes that were connected to the interior seaway further to the east.
		As the Paleocene progressed, the interior seaway began to drain, and the marine waters receded from the foot of the Sevier orogenic belt to the east permanently.
	www.oberlin.edu /Geopage/projects/204projects/mausner/Bryce_Canyon.html (705 words)

	Mesozoic History of Arizona
		The seaway formed in response the Sevier orogenic belt as it advanced to the east and was eroded.
		The Sevier Orogeny constructed an impressive magmatic arc along the west coast of the United States, the remains of which are now exposed in the Sierra Nevada Batholith.
		Deposition associated with this seaway and the Sevier Foreland Basin is observed in the eastern and northeastern portions of the state near St. Johns and at Black Mesa, respectively.
	web1.shastacollege.edu /geoscience/histories/Az/Mesozoic/mz_histAz.html (2327 words)

	tushman (Site not responding. Last check: 2007-11-05)
		Curved Mountain Belts and the Wyoming Salient of the Sevier Orogeny
		The main goal of this project is to understand the mechanics responsible for the formation of curved mountain belts, specifically the Sevier fold and thrust belt in western Wyoming and Eastern Idaho.
		The Sevier Orogeny began in the Cretaceous at about 140 million years ago and progressed into the foreland of the Rocky Mountains.
	www.brynmawr.edu /scienceresearch/tushman.html (217 words)

	Glencoe Science Earth Science Extending the Content: Chapter 20 - Mountain Building
		The Sevier Orogeny is characterized by low-angle thrust faults and folds caused by compression from the collisional tectonism.
		The Laramide Orogeny is characterized by vertical uplifts.
		The Laramide Orogeny mainly affected the area east of the folds and faults caused by the Sevier Orogeny.
	www.glencoe.com /sec/science/earthscience/unit/chapter/extend.phtml?iid=20&iChapter=20&iUnitNumber=5&iUnitID=5 (696 words)

	Earth Science: Plate Tectonics Present to Cambrian
		Orogeny continues in the Mediterranean region and India nears its junction with southern Asia.
		The Atlantic lengthens and widens, the Sevier orogeny continues, and the Caribbean arc is formed.
		The western fringe of Pangaea was adjacent to a long subduction zone that formed the eastern margin of the Pacific "ring of fire".
	geowords.com /lostlinks/j01/1.htm (710 words)

	The Middle Jurassic Elko Orogeny -- a Major Tectonic Event in Nevada-Utah (Site not responding. Last check: 2007-11-05)
		An Elko foredeep in western Utah is inferred from westward-thickening Middle Jurassic strata that abruptly terminate at the edge of the Colorado Plateau.
		The foredeep was uplifted and eroded during the Sevier orogeny.
		Sevier deformation may have disrupted Elko traps resulting in the loss of the trapped hydrocarbons or their migration to other sites.
	aapg.confex.com /aapg/sl2003/techprogram/paper_80467.htm (329 words)

	Sevier Thrust System - Utah Geological Survey
		The Sevier orogeny is often confused with the Laramide orogeny, even by geologists, because they overlap in time and location.
		The Laramide orogeny developed in the Late Cretaceous and continued into the Oligocene epoch, mostly synchronous with late stages of the Sevier orogeny.
		The two orogenies were produced by the same crustal shortening event, collision of the Farallon and North American plates, but they are distinguished by style of deformation.
	www.ugs.state.ut.us /utahgeo/geo/thrustfault5.htm (275 words)

	Geology of the Bryce Canyon area - Open Encyclopedia (Site not responding. Last check: 2007-11-05)
		Uplift was caused by a mountain-building episode called the Laramide orogeny, which lasted from late Cretaceous to early Paleocene time.
		Among these are the 50 to 100 foot (15 to 30 m) thick Oligocene-aged Boat Mesa Conglomerate (made of Claron-derived clastic material) and the Pliocene to early Pleistocene-aged Sevier River Formation (made of brownish-gray sandstone with some conglomerates).
		Long north-south trending faults, such as the Sevier and the Paunsaugunt, were created as well.
	open-encyclopedia.com /Geology_of_the_Bryce_Canyon_area (1006 words)

	fieldtrip (Site not responding. Last check: 2007-11-05)
		Associated with this subduction were accreted terranes along the coast, a broad magmatic arc, a fold and thrust belt, and a broad foreland basin (figure 1).
		Earliest thursting of the Sevier Orogeny may have been in the Middle Jurassic, but this thrust event is poorly documented and age constraints are very poor.
		The Laramide Orogeny differed from the thin-skinned ramp-style thrusting of the Sevier Orogeny in that it involved basin uplift of blocks across the foreland, dissecting the foreland into subbasins that make the modern topography (Armstrong, 1968).
	www.geocities.com /CapeCanaveral/Campus/2894/fieldtrip.htm (770 words)

	2. Geologic Background - The Mid-Tertiary Ignimbrite Flare-Up (Site not responding. Last check: 2007-11-05)
		In the late Cretaceous, thin-skinned deformation from the Sevier Orogeny resulted in east transport of thrust sheets across the Cordilleran region (Odlow et al., 1989).
		Somewhat coeval with the Sevier orogeny was the Laramide Orogeny in the late Cretaceous and early Tertiary.
		With the termination of the Laramide orogeny, a complex pattern volcanism and extension occurred in the Cenozoic.
	www.colorado.edu /GeolSci/Resources/WUSTectonics/CzIgnimbrite/INVESTIGATION/SECTION_2/geol_background_intro.html (388 words)

	Describing the structural geology and geologic history of the west central Conger Range, Utah (Site not responding. Last check: 2007-11-05)
		The compression was a result of the Cretaceous (100-70Ma) Sevier Orogeny, during which thrusting created large (tens of square kilometers) decollemonte surfaces and folds.
		This was caused during the Sevier orogeny when a thrust sheet composed of mainly Mississippian to Devonian age rock was broken up from differential thrusting over the footwall block.
		This surface was created during the Cretaceous Sevier orogeny, and was reactivated in Tertiary times as an extensional surface when the continental crust is to have extended on the order of 100%.
	www.denison.edu /geology/geojournal/nixon99.html (431 words)

	Info and facts on 'Laramide orogeny' (Site not responding. Last check: 2007-11-05)
		The phenomenon is named for the Laramie Mountains (additional info and facts about Laramie Mountains) of eastern Wyoming (A state in the western United States; mountainous in the west and north with the Great Plains in the east)
		Part of the proto-Rocky Mountains would be later modified by extension to become the Basin and Range Province (additional info and facts about Basin and Range Province).
		Compare the earlier Sevier orogeny and the still-earlier Nevadan orogeny of the late Jurassic (additional info and facts about late Jurassic) — early Cretaceous (additional info and facts about early Cretaceous).
	www.absoluteastronomy.com /encyclopedia/l/la/laramide_orogeny.htm (362 words)

	PNW Focus Page 8 (Site not responding. Last check: 2007-11-05)
		The Cordilleran orogeny can be broken down into several individual events each named according to either the specific region within the west in which it occurred, the specific time interval in which it occurred, or the specific set of geologic structures associated with that event.
		The Sevier orogeny is distinguished on the basis of fold and thrust structures that affected the upper continental crust throughout the Rocky Mountain region.
		The Laramide orogeny is generally said to have taken place from the Cretaceous period up until the Eocene epoch, so it overlaps in time with the Sevier orogeny.
	wvcweb.ctc.edu /rdawes/FocusPages/PNWorogenies.html (962 words)

	Garden of the Gods Geology (Site not responding. Last check: 2007-11-05)
		Although some geologists reduce these two orogenies and the Laramide Orogeny to the status of "phases" of a much more extensive event known as the Cordilleran Orogeny that formed all the western mountains of North America (a cordillera is defined simply as a mountain chain).
		The Nevadan and Sevier Orogenies were also caused by the same process, as the Farallon oceanic plate and the North American continental plate collided beginning 150 MYA.
		This theory is related to the idea that many fragments of the Farallon Plate, after being subducted during the Nevadan and Sevier Orogenies, were never consumed back into the mantle but continued to be pushed along to the east underneath the North American Plate.
	home.att.net /~goggallery/frames/geology2.htm (3186 words)

	Geology of the South Snake Range and Great Basin National Park
		The rocks in the park were further changed during a mountain-building event that occurred around 200 million years ago during the Mesozoic Era.
		This event, the Sevier Orogeny, pushed layers of rock on top of each other, doubling the thickness of the crust.
		Sevier Lake today is a playa lake, one that collects water in colder and wetter seasons, but dries up in warmer seasons.
	www.nps.gov /grba/parkgeology.htm (927 words)

	Porter GeoConsultancy - Ore Deposit Description
		The sequence was subjected to another orogenic event in the late Permian to lower Triassic, the Sonoma Orogeny, which resulted in the further eastward transport of western siliceous rocks over both the eastern carbonate assemblage and the post Antler overlap assemblage.
		It is possible that the compression which formed the Tuscarora Antiform was related to either the closing stages of the Sonoma Orogeny, or the preliminary stages of the Sevier Orogenic Event, the main phase of which commenced during the late Jurassic, as described below.
		From the end of the Sevier Orogeny when the topography was more extreme, the amount of relief was diminished to produce extensive marshes and swamps.
	www.portergeo.com.au /database/mineinfo.asp?mineid=mn712 (4924 words)

	Cretsum.html (Site not responding. Last check: 2007-11-05)
		The Sevier deformation occurred to the EAST of the previous Sierra Nevadan Orogeny, which seeminly contradicts the idea of continental accretion by terrane accretion (in which younger orogenies occur further away from the craton.
		This represents a second wave of deformation from the same subduction as the Sevier; it probably represents a change (increase) in the rate of subduction from a pause after the Sevier.
		With sea level high, with newly formed mountains (from the Sevier Orogeny and older Sierra Nevada Orogeny) eroded sediments into this "bathtub" so that the Cretaceous Period left a huge pile of marine and non-marine sediment.
	www.uvm.edu /~cmehrten/courses/historical/Cretsum.html (910 words)

	mesozoic glossary (Site not responding. Last check: 2007-11-05)
		Late Jurassic to Cretaceous phase of the Cordilleran orogeny; most strongly affected the western part of the Cordilleran mobile belt.
		The Cretaceous phase of the Cordilleran orogeny that affected the continental shelf and slope areas of the Cordilleran mobile belt.
		A Permian-Triassic orogeny caused by the collision of an island arc with the southwestern margin of
	www.epcc.edu /ftp/Homes/krimkus/mesozoicgloss.htm (307 words)

	deseretnews.com \| Rocks tell a story of upheavals
		At the time the foliations occurred, the Pequops — in the East Humboldt Range region — were part of a mountain belt called the Sevier orogeny that extended across Utah and Nevada.
		Other parts of the Sevier orogeny have been popular geological research sites, but the Pequops have rarely been studied, Dinklage said.
		That thrusting is believed to be in part responsible for the formation of the Sevier orogeny.
	deseretnews.com /dn/view/0,1249,600139832,00.html (705 words)

	[No title] (Site not responding. Last check: 2007-11-05)
		"The Antler Orogeny created a huge mountain range in central Nevada and a seaway east of Nevada, similar to the Cretaceous seaway that created all the source rocks for Wyoming and Montana," he continued.
		When the Antler Orogeny subsided there was a transgression of Pennsylvanian seas and normal deposition until the Late Cretaceous, when the Sevier Orogeny, another major compressional event, took place, he said.
		The Sevier Orogeny created the Wyoming overthrust belt, the Canadian foothills as well as the structures around Monterey, Mexico.
	www.aapg.org /explorer/2003/11nov/nev_wyo.cfm (538 words)

	GEOLOGIC TIME SCALE (Site not responding. Last check: 2007-11-05)
		Arcs and micro continents slam into western N.A. and the Sevier orogeny begins (early Cretaceous).
		The Atlantic lengthens and widens, the Sevier orogeny continues, and the Caribbean arc is formed (late Cretaceous).
		As plate positions continue to adjust to the opening of the Atlantic, The Rocky Mountains grow and the Alps and Pyrenees are formed.
	spearfish.k12.sd.us /shs/depart/science/scidept/ninesci/chuck/geolhist/geodetails.html (475 words)

	EARTHSCOPE WORKSHOP
		This orogeny was the most intense of a series of tectonic and magmatic events that progressively grew and reconstructed the western continent obliquely across earlier Archean and Proterozoic structures.
		Two conductive, diapiric structures in the upper mantle project upward toward concentrations of low resistivity in the lowermost crust and are interpreted to represent mantle melting, basaltic crustal underplating, and fluid exsolution from melts.
		Wanda Taylor: If Sevier thrusting is important to current extension, we need to understand the thrust history and kinematics.
	www.seismo.unr.edu /GreatBREAK/contents/Report/Workshop_Report-v7-a.htm (8407 words)

	[No title]
		The Sevier compressional orogeny and foreland basin phase.
		Phase 5: Sevier Compressional Orogeny and Foreland Basin Phase The Sevier compressional orogeny and foreland basin phase began 100 million years ago in the later part of the Cretaceous period and continued for 44 million years (Hintze, 1988, p.
		Map of Phase 5 The Sevier orogeny is attributed to subduction of an oceanic plate off the western coast of North America, in what is now Nevada (Chronic, 1990, p.
	emp.byui.edu /OTTS/Science/Geology/Historical_Geology/Geologic_History_of_Utah_Valley/The_Geologic_History_of_Utah_Valley_Stephen_R_Ott.doc (2767 words)

	Utah 7 (Site not responding. Last check: 2007-11-05)
		• Phase VI Phase 6 was Laramide orogeny in the Early Cenozoic (65-37 Ma).
		This orogeny, like the prior Sevier orogeny, consisted mainly of E-W compression associated with the subduction zone to the west.
		This compressive episode included substantial folding as well as thrusting, and it was widespread, forming the Rocky Mountains.
	www.mines.utah.edu /~wmgg/courses/UOnline/slideshow/Utah_7.html (88 words)

	Geology111-Lecture 32
		The Appalachian belt was added on the east and south during the Paleozoic as a result of a series of "orogenies" (mountain building episodes).
		Major orogenies that contributed to the Cordilleran include: the Antler orogeny in the Carboniferous, the Sonoma Orogeny in the Permian, the Nevadan Orogeny in the Jurassic, the Sevier Orogeny in the late Jurassic, and the Laramide Orogeny in the Cretaceous.
		In the Arctic, the Franklin belt was added at the end of the Devonian during the Innuitian Orogeny (also sometimes called the "Ellesmerian Orogeny", and sometimes included with the Caledonian Orogeny).
	www.geol.binghamton.edu /faculty/naslund/Geol.111.lect34c.html (453 words)

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