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Topic: Uralian orogeny

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	Orogeny - Wikipedia, the free encyclopedia
		Orogeny (Greek for "mountain generating") is the process of mountain building, and may be studied as a tectonic structural event, as a geographical event and a chronological event, in that orogenic events cause distinctive structural phenomena and related tectonic activity, affect certain regions of rocks and crust and happen within a time frame.
		Orogenic events occur solely as a result of the processes of plate tectonics; the problems which were investigated and resolved by the study of orogenesis contributed greatly to the theory of plate tectonics, coupled with study of flora and fauna, geography and mid ocean ridges in the 1950s and 1960s.
		It was, in the context of orogeny, contested hotly by proponents of vertical movements in the crust (similar to tephrotectonics), or convection within the asthenosphere or mantle (geology).
	en.wikipedia.org /wiki/Orogeny (1398 words)

	Orogeny - QuickSeek Encyclopedia (Site not responding. Last check: 2007-09-16)
		Orogeny is the process of mountain building, and as such is both a tectonic structural event, a geographical event and a chronological event, in that orogenic events happen within a time frame, affect certain regions of rocks and crust, and cause distinctive structural phenomena and related tectonic activity.
		Orogenic events occur solely by the processes of plate tectonics and the problems which were investigated and resolved by the study of orogenesis contributed greatly to the theory of plate tectonics, coupled with study of flora and fauna, geography and mid ocean ridges in the 1950's and 1960's.
		These are usually long, thin, arcuate tracts of rocks which have a pronounced linear structure resulting in terranes or blocks of deformed rocks, separated generally by dipping thrust faults.
	orogeny.quickseek.com (1199 words)

	Uralian orogeny - Wikipedia, the free encyclopedia
		The Uralian orogeny refers to the long series of geological events that raised the Ural Mountains, starting in the Late Carboniferous and Permian periods of the Palaeozoic Era, ca.
		In terms of plate tectonics and continental drift, the Uralian orogeny resulted from a southwestern movement of the Siberian Plate, catching a smaller landmass, Kazakhstania, between it and the nearly completely assembled supercontinent, Pangaea.
		The mountains of Eastern Europe, on the paleocontinent geologists call Laurussia, and Western Siberia rose as the edge of Kazakhstania rode over the European plate.
	en.wikipedia.org /wiki/Ural_orogeny (150 words)

	PRE-CASPIAN B URALS PROJECT
		Uralian orogenesis concluded with the collision and suturing of the Kazakhstan and Siberian continents to the EC in Late Permian- Middle Triassic time.
		The Precambrian rocks exposed along the length of the Uralian fold-thrust belt are interpreted to be part of an older passive margin sequence that was structurally overprinted by the Cambro-Ordovician rifting event.
		The main stage Uralian orogenic deformation and growth of the Uralian Highlands is traditionally said to have occurred during the late Early Permian through Middle Triassic, driven by a long-term collision of the East European margin with the Kazakhstan continent and subsequently the Siberian continent over a 50 million year period.
	pri.boisestate.edu /proposal/Final2299b.html (8083 words)

	80
		Subsequent exhumation, during the Uralian orogeny, is evidenced by retrograde re-equilibration to amphibolite facies, and, later, second stage, rodingitisation.
		We suggest that the variously determined age of 410-415 Ma at the Silurian-Devonian boundary dates a metasomatic/metamorphic event in the history of the garnet amphibole pyroxenite blocks; and, tentatively, conclude that the older core age of 467 Ma is a magmatic zircon crystallisation age associated with ocean crust formation.
		The palaeontological and palaeomagnetic data used as evidence of Caledonian orogenesis is inconclusive and its interpretation disregards large-scale Late Palaeozoic strike-slip displacements in SW Poland and the collage structure of its pre-Permian basement.
	www.the-conference.com /JConfAbs/4/80.html (18024 words)

	SILURIAN STROMATOLITE REEFS AS INDICATORS OF ENVIRONMENTAL CHANGE ALONG THE URALIAN SEAWAY
		Pay-Khoy and Uralian reefs were rigid organic structures that grew at a passive platform margin on eastern Baltica.
		After early phases in the Caledonian Orogeny, the western part of the Altaj-Sayan was a shelf marginal to the Siberian craton.
		Interbedded units imply that the Uralian Seaway was a partially enclosed, narrow, subequatorial sea affected by fluctuating environmental conditions perhaps associated with late-stage Caledonide activity.
	gsa.confex.com /gsa/2005CD/finalprogram/abstract_85345.htm (413 words)

	Orogeny Encyclopedia @ ArtsInTexas.com (Arts in Texas) (Site not responding. Last check: 2007-09-16)
		These thrust faults carry relatively thin plates (which are called nappes, and are different to tectonic plates) of rock in from the margins of the compressing orogen to the core, and are intimately associated with folds and the development of metamorphism.
		With hindsight, we can discount Dana's conjecture that this contraction was due to the cooling of the Earth (aka the cooling earth theory).
		Zwart">Zwart (1967) drew attention to the metamorphic differences in orogenic belts, proposing three types, modified by Pitcher (1979);
	www.artsintexas.com /encyclopedia/Orogeny (968 words)

	Shear Wave Splitting at Station ARU in the Foredeep of Urals
		The continental collision at the final stage of Uralian orogeny formed an extensive thrust-sheet complex to the east of ARU, and may also have deformed the sediments underlying ARU.
		It may be related to the deformation within the East European platform that predates the formation of the orogen.
		The anisotropy-inducing fabric in the lower part of the lithosphere is aligned nearly normal to the strike of the Uralian Orogen.
	www.ldeo.columbia.edu /users/menke/ApUr/node5.html (474 words)

	104
		The intrusion of grt-bearing felsic melts is confined to the post-collisional phase of the orogeny probably related to the rapid exhumation of the belt.
		The 850/830 Ma boundary (the Yenisey phase) is marked by (a) crustal contraction, orogeny, granitoid magmatism, and regional metamorphism reported for the Siberian craton's margins facing the Yenisey Range and (b) the inception of primary suprasubduction-related island-arc systems of Paleo-Asian Ocean (East Sayan, the Baikal-Muya belt).
		Ar cooling ages of muscovite (543±4 to 597±4 Ma) and the distinctive pre-Ordovician deformation history indicate that the Neoproterozoic orogeny was initiated by the accretion of this terrane with the E-margin of Baltica.
	www.the-conference.com /JConfAbs/4/104.html (13260 words)

	projects.html
		The Uralian Orogen played a fundamental role in the assembly of the Eurasian portion of Pangaea in late Paleozoic to early Mesozoic time, yet the detailed timing, paleogeography, and kinematic evolution of this collisional system are not well established.
		Remarkable features include: (1) the limited amount of shortening in the foreland fold-thrust belt; (2) the geometry of the foreland basin; (3) the relatively narrow width of the tectonized zone; and (4) the lack of a significant syn- to post-tectonic high-grade metamorphic core along the axis of the orogen.
		Second, Uralian orogenesis may have occurred in phases of short duration, preventing the accumulation of significant crustal deformation over time.
	earth.boisestate.edu /home/cjnorth/more/projects.html (697 words)

	H
		The result was the Late Mississippian HERCYNIAN OROGENY (roughly equivalent to the Allegheny Orogeny of North America, which occurred slightly later - in the Pennsylvanian).
		It was this compression that caused widespread thrust-faulting throughout the Appalachians, resulting in the "valley and ridge" province.
		Most of the underlying structures of the present rocky mountains were the result of the Laramide Orogeny; however, the actual landscape we see today resulted from episodes of uplift and erosion in the later Cenozoic era.
	courses.unt.edu /hwilliams/GEOL_3020/exam3review.htm (2378 words)

	GEODE Urals Workshop 2000
		Zircon dates from the Ilmen region confirm this age of the crustal rocks on the Uralian margin of Baltica.
		He reviewed the early intra-cratonic deposits (Cr-PGE) west of the Main Uralian Fault, those deposits of oceanic crustal affinity (Kempirsai Cr, ‘Cyprus’ type Cu only VHMS deposits, arc-related deposits (the main VHMS of both polymetallic and Cu-Zn type) and then the post-collision deposits of contintal margin association (Magnitogorsk Fe) and lastly late-post orogenic gold deposits.
		Puchkov, V.N. Structure and geodynamics of the Uralian orogen.
	www.gl.rhbnc.ac.uk /geode/Urals.html (4840 words)

	Geology111-Lecture 28 (Site not responding. Last check: 2007-09-16)
		The Taconic mainly affected the northern Appalachians and may represent the initiation of a subduction zone under north America or the collision of North America with an island arc that formed off the coast.
		.....The Innuitian Orogeny occured in the Devonian and Mississipian and affected the Franklin Geosyncline in northern Canada.
		.....The Hercynian Orogeny occured in the Upper Carbonmifierous (the Pennsylvanian).
	www.geol.binghamton.edu /faculty/naslund/Geol.111.lect29c.html (481 words)

	Devonian (Site not responding. Last check: 2007-09-16)
		The two supercontinents, Laurentia and Baltica, collided along a convergent plate boundary to form the larger continent, Laurasia in the late Silurian and early Devonian period.
		As a result of this collision, the Acadian Orogeny occurred on the eastern margin of Laurasia.
		These were mountains in the Uralian mobile belt of eastern Baltica.
	www.caveofthewinds.com /devonian.html (211 words)

	EVOLUTION OF THE ARCTIC-NORTH ATLANTIC AND THE WESTERN TETHYS--A VISUAL PRESENTATION OF A SERIES OF ...
		In the eastern Mediterranean-Black Sea area, the limits of the Proto-Tethys Ocean during the latest Carboniferous, and consequently the outlines of the Hercynian fold belt as shown in the Permo-Carboniferous reconstruction given by Plate 6, are conceptual.
		This marked the onset of the Uralian orogenic cycle that culminated during the Late Permian-Early Triassic in the consolidation of the Ural-Novaya Zemlya-Taimir and the Altay-Sayan fold belts.
		This system was destroyed during the Uralian orogeny when the Kazakhstan and Siberian cratons converged and collided with the eastern margin of Fennosarmatia.
	www.searchanddiscovery.com /documents/97020/memoir43.htm (13414 words)

	The post
		The timing of orogeny is constrained to the Vendian, perhaps extending into the Early Cambrian (see Puchkov, 2002, for references).
		Overlying these basal clastics in the east (Uralian front) is a monotonous Upper Cambrian and/or Tremadocian succession of sandstones, siltstones, limestones and shales.
		The sandstones and sandy shales are cross–bedded, rippled and they generally lack macrofossils (or the latter have extremely low diversity) and the facies is interpreted to represent coastal marine, shallow water, high energy environments.
	www.unt.edu.ar /fcsnat/INSUGEO/geologia_17/85.htm (1255 words)

	t32b in fm01
		The W dipping reflection bundles are interpreted to represent the southwestward continuation of the Sveconorwegian ductile shear zones exposed in SW Sweden.
		The change in sedimentary environment in conjunction with deformation, both of Carboniferous age, is thought to reflect the onset of Uralian orogenesis and the accretion of the Northern terrane to Siberia.
		Uralian orogeny, suturing Baltica to Siberia, began to the south in the early Carboniferous and thereafter progressed northwards.
	www.agu.org /cgi-bin/SFgate/SFgate?&listenv=table&multiple=1&range=1&directget=1&application=fm01&database=/data/epubs/wais/indexes/fm01/fm01&maxhits=200&="T32B" (6895 words)

	Dr. Walter Snyder (Site not responding. Last check: 2007-09-16)
		Overall interest in better understanding the Permo-Carboniferous Uralian orogeny, its basins and deformation with respect to the development of Pangaea.
		Continued research on the Upper Paleozoic stratigraphy and structure of Nevada, including the Roberts Mountains allochthon, Golconda allochthon, and the basins of the Antler foreland.
		Directly impacts understanding of the classic Antler and Sonoma orogenies, and a growing data set clearly documenting that the continental margin between these two orogenies was tectonically active and not quiescent as is generally believed.
	pri.boisestate.edu /drwalter.htm (261 words)

	[No title] (Site not responding. Last check: 2007-09-16)
		Apatite fission track samples were collected from the ultrahigh- pressure (UHP) Maksyutov Complex, south Ural Mountains, in the footwall of the Main Uralian fault (MUF) to constrain the low-temperature cooling history and to establish the late stage exhumation rate for the complex.
		Fission track samples were taken along a 70-km north-south transect and a 5-km east-west traverse through the Maksyutov Complex, with two samples from the hanging wall of the MUF.
		Modeling for the north-south transect indicates that exhumation occurred contemporaneously in the north and south regions of the complex with cooling to 110°C between 375 and 315 Ma, coinciding with the onset of the Uralian orogeny.
	www.agu.org /pubs/gap/1999TC900053/1999TC900053.html (316 words)

	ophiolites
		The Uralian ophiolites are a prominent geological feature in the Urals and are cited as prime evidence for a paleo-ocean that once separated the former eastern margin of the East European continent from the western margin of Kazakhstan during the early Paleozoic.
		The ophiolites are found within a ~2000 km long north-south trending belt of mafic-ultramafic bodies located within the Main Suture Zone of the Urals.
		Age constraints on Urals ophiolites and the Uralian orogeny [Ref: Edwards and Wasserburg, 1985]
	www.geo.arizona.edu /geo5xx/geo527/Urals/ophiolites.html (540 words)

	[No title]
		The shales were deposited as the Acadian Orogeny progressed.
		The orogeny started to the north and worked its way southward, closing the Iapetus Ocean.
		This orogeny extended the Appalachians southwestward deforming rocks from southern New York to Alabama and formed the Ouachita Mountain Belt in Oklahoma and the Marathon Belt in Texas.
	www.gpc.edu /~cgelbaum/chapter9.htm (1081 words)

	Vince Cronin's Physical Geology Notes: Earth History
		Caledonian orogeny involved collision of Norway and Greenland.
		Ouachita-Alleghenian orogeny (Late Carboniferous-Permian) in the Appalachians records the final closure of Iapetus with the collision of South America-Africa with the SE coast of North America
		Uralian orogeny as Kazakhstan collides with North Europe to produce the Ural Mountains.
	www3.baylor.edu /~Vince_Cronin/PhysGeol/earth.hist.html (969 words)

	chap 8
		Oceanic closing and orogeny to form Pangaea a.
		Climax of orogeny: Late Silurian to Early Devonian a.
		Asian continental history A. Encompasses 9 microcontinents with narrow seaways (like Uralian seaway) between them B. All seaways began closing phase during Early Paleozoic C. Asia assemblage completed in Late Paleozoic D. Characteristics of Asian orogenic belts 1.
	www2.umt.edu /GEOLOGY/faculty/stanley/g106/g106_ch8.htm (1092 words)

	USGS Open File Report 99-50N, South and North Barents Russian Offshore Arctic - Province
		The tectonic history of the Euro-Asian Arctic is anchored by the Early Proterozoic (Karelian) orogeny, which established the stable Russian-European platform adjacent to the Archean Baltic Shield (Alsgaard, 1993; Dore, 1995; Bogdanov and others, 1996).
		The Early Paleozoic Caledonian orogeny largely closed the Cambrian Iapetus (old Atlantic) Ocean and consolidated the Laurentia (Greenland/North America) and Baltic (Euro-Russian) continental plates, primarily impacting the more western Barents Sea but perhaps also establishing tectonic trends northeastward into at least part of the North Barents Basin.
		Collisions of the Laurentia/Baltic plate with the West Siberian plate (Permo-Triassic "Uralian" orogeny and Early Jurassic "Early Kimmerian" orogeny) tectonically defined the eastern boundaries of the Barents and Timan-Pechora Provinces by creating the Ural and Novaya Zemlya foldbelts (fig.
	geology.cr.usgs.gov /energy/WorldEnergy/OF99-50N/province.html (909 words)

	k34 Evidence of supercontinents
		Rhodinia,, evidently was forming as 0.6-0.8 Gy orogenies record in the now shield rocks of South America, Africa, and Asia.
		But in that interval, Rhodinia was elsewhere fragmenting as passive margin sediments of that age about broken free Laurentia began to accumulate about 0.76 Ga. Rhodinia could have had only the briefest existence as a supercontinent 0.87 Ga if it ever was whole (Figure k34.4).
		Its older parts had been assembling 0.8-1.0 Ga as orogenies record in the now shield rocks of North America and Europe.
	geowords.com /histbooknetscape/k34.htm (442 words)

	Evolution of Late Archaean granitoids and gneisses of the Baltic Shield (Site not responding. Last check: 2007-09-16)
		The Lopian orogeny was accompanied by alt least one phase of NE-SW compression/thrusting and granulite facies metamorphism.
		The Central Lapland Granitoid Complex is geologically and geochronologically heterogenous (Lauerma 1982) but the widespread pink microcline granite presumably crystallized during the late orogenic stages of the Svecocarelian orogeny (Huhma 1986).
		Lithological and structural similarities between the Pudasjärvi and Kuhm blocks suggest that they were a single block as the Karelian supracrustals were deposited on top.
	homes.jcu.edu.au /~jc146233/Archaean.html (7548 words)

	[No title] (Site not responding. Last check: 2007-09-16)
		The high-pressure complex constitutes a large antiform in the footwall of the east-dipping Main Uralian fault and is composed of two tectono-metamorphic units.
		The core of the antiform exposes well-preserved eclogites and blueschists in the structurally lower Unit 1 which experienced peak metamorphic conditions of ~17 kbar and ~570 °C. In contrast, the structurally overlying Unit 2 contains lawsonite-bearing assemblages indicating both lower peak pressure (< 8 kbar) and temperature (< 450 °C).
		Large-scale folding of the Maksyutov antiform and minor top-to-the-east backthrusting on the western limb took place during a late stage of the Uralian orogeny, coeval with formation of the foreland thrust-and-fold-belt in Permian time.
	www.gfz-potsdam.de /pb4/pg2/people/hetzel/gsa.htm (334 words)

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