Penokean Orogeny From Rifting to Iron Formations, and The Penokean Collisions author Davis, Peter ... known as the Algoman orogeny in the U. S. named for Algoma, Wisconsin Algoma , Kewaunee County ... orogeny in Canada. ref name ojakangas rp 32 ref name nature cite web title Voyageurs ... of the Algoman orogeny. The orogeny affected adjacent regions of northern Minnesota and Ontario ... than in subsequent orogenies. ref name stearn rp 158 It is the earliest datable orogeny in North ... grade metamorphic rocks are associated with the orogeny. ref name keck cite report title U PB ... into a system of mountains by the Algoman orogeny. ref name schwartz The volcanic beds are convert ... shear zones caused by continued compression that occurred during the Algoman orogeny. ref name resgeol ... is around mya 2500 million years ago , the time of the Kenoran orogeny. Rocks comprising the Slave province ... of Earth Category Orogeny Category Terranes ... more details
East African Orogeny is the Neoproterozoic orogeny that affects the East African Orogen. ref Stern, R. J. 1994 Neoproterozoic 900 550 Ma Arc Assembly and continental collision in the East African Orogen. Annual Review of Earth and Planetary Sciences, 22, 319 351 ref The orogeny evolved from an accretion geology accretionary orogeny involving the amalgamation of arcs and evolved into a collisional orogeny when the Neoproterozoic continent Azania ref Collins, A.S. and Windley B.F. 2002 . The Tectonic Evolution of Central and Northern Madagascar and its place in the Final Assembly of Gondwana. The Journal of Geology, 110 325 340. ref collided with the Congo Tanzania Bangweulu Block at 640 Ma. ref Collins, A.S. and Pisarevsky S.A. 2005 . Amalgamating eastern Gondwana The evolution of the Circum Indian Orogens. Earth Science Reviews. 71 229 270. ref The orogeny is the earlier of two orogenies that affects the East African Orogen ref Meert, J.G. 2003 . A synopsis of events related to the assembly of eastern Gondwana, Tectonophysics, Volume 362, pp. 1 40. ref and is followed by the Ediacaran Cambrian Kuunga Orogeny . ref Meert 2003 . ref References Reflist Tectonics stub Category Orogeny Category Proterozoic ... more details
The Alice Springs Orogeny was a major intraplate tectonic mountain building episode in central Australia responsible for the formation of a series of large mountain range s. ref Wells AT, Forman DJ, Ranford ..., Australia, Bulletin 100. ref Duration The Alice Springs Orogeny was a long lived event, beginning ... orogeny was centered in an area that had previously been a marine sedimentary basin, and involved ... Springs Orogeny had its beginnings in the Late Ordovician , continuing during the Silurian and Devonian ... much of central Australia. Prior to the Alice Springs Orogeny the Amadeus Basin Amadeus , Georgina ... Orogeny disentombed the Arunta Inlier during mainly south directed thrusting. ref Fl ttmann, T., Hand ... the late Neoproterozoic to early Cambrian Petermann Orogeny and the Devonian to Carboniferous Alice Springs Orogeny. The pattern of fault reactivation during these events is similar to the pattern of subsidence in the overlying basin. During the Alice Springs Orogeny, reactivation occurred along ... Petermann Orogeny. The major Petermann aged structures that were not buried during renewed subsidence were inactive during the Alice Springs Orogeny. The record of reactivation tells us that the presence ... continuous throughout the Alice Springs Orogeny, but focused at a number of discrete loci, situated ... Orogeny is localised by suitably oriented structural weaknesses such as faults. This theory is supported ..., intraplate orogeny and the geochemical structure of the crust A central Australian perspective ... Springs Orogeny was widespread, there are two major regions affected by significant basement involved ... structural feature reactivated during the Alice Springs Orogeny. This shear zone is associated .... In this basin the Alice Springs Orogeny caused reactivation of the Munyarai Thrust which had also undergone reactivation during the Petermann Orogeny. Shortening here resulted in southward thrusting ... Hand References reflist Category Orogeny Category Northern Territory Category Geology of the Northern ... more details
The Pan African orogeny was a series of major Neoproterozoic orogeny orogenic events mountain building which related to the formation of the supercontinent s Gondwana and Pannotia about 600 million years ago. sfn Glossary The Mozambique Belt , extending from east Antarctica through East Africa up to the Arabian Nubian Shield , formed as a suture between plates during the Pan African orogeny. sfn Cutten 2002 The Mozambique ocean began closing between Madagascar India and the Congo craton Congo Tanzania craton Tanzania craton between 700 and 580 million years ago, with closure between 600 and 500 million years ago. sfn Grantham Maboko Eglington 2003 p 417 418 References reflist colwidth 30em Sources refbegin cite web ref harv url http gsa.confex.com gsa 2002AM finalprogram abstract 43792.htm title THE MOZAMBIQUE BELT, EASTERN AFRICA TECTONIC EVOLUTION OF THE MOZAMBIQUE OCEAN AND GONDWANA AMALGAMATION last Cutten first Huntly N.C. date October 29, 2002 publisher The Geological Society of America accessdate 2011 12 28 cite web ref harvid Glossary url http www.dinodata.net Golonka GLOSSARY.pdf title Glossary of Plate Tectonic and Paleogeographic Terms format PDF accessdate 2006 04 09 not available without registration free cite book ref harv url http books.google.ca books?id 4B8nrDVjaCgC&pg PA417 chapter A review of the evolution of the Mozambique Belt and implications for the amalgamation and dispersal of Rodinia and Gondwana first1 G.H. last1 Grantham first2 M. last2 Maboko first3 B.M. last3 Eglington title Proterozoic East Gondwana supercontinent assembly and breakup publisher Geological Society year 2003 ISBN 1862391254 refend Category Orogeny Category Geology of Africa Category Proterozoic tectonics stub he ... more details
Unreferenced date December 2009 The Hunter Bowen Orogeny was a significant arc accretion event in the Permian and Triassic periods affecting approximately 2,500 km of the Australia n continental margin . The Hunter Bowen Orogeny occurred in two main phases, a Permian accretion of previously formed passive marginal Devonian and Carboniferous sediments in the Hunter region and mid west region of what is now New South Wales, separated by rifting, back arc volcanism and a later Permian to Triassic event resulting in arc accretion and metamorphism during a subduction event. The Hunter Bowen Orogeny has resulted in the New England Fold Belt, a tectonic accretion of metamorphic terranes and mid crustal granite granitoid intrusions, flanked by Permian to Triassic sedimentary basins which were formed distally to the now eroded orogenic mountain belt. While the Great Dividing Range north of Sydney is a prominent landform, this is more the result of Cainozoic volcanism and crustal uplift since the Jurassic than the result of the original orogenic belt which is essentially mimics. Gravity, magnetics and bathymetry indicate that several slivers of crust formerly from the Hunter Bowen orogen are now spread out across the Indo Australian plate east of the Australian continental landmass, forming some isolated submerged ocean plateaux and islands, notably Lord Howe Island . The Sydney Gunnedah Bowen Basin The Hunter Bowen event produced a 3,000 km long structural foredeep above a Late Carboniferous and Palaeozoic margin to the weakly consolidated Australian continental mass which was part of the Gondwana Supercontinent at this time the orogen developed to the east of the Palaeozoic ... See also Geology of Australia Orogeny Subduction zone Shear geology Granite particularly the section on S type and I type DEFAULTSORT Hunter Bowen Orogeny Category Geology of Australia Category Geology of New South Wales Category Permian Category Triassic Category Orogeny ... more details
that created the Great Plains . Overview The Trans Hudson orogeny was the culminating event of the Paleoproterozoic Laurentian assembly, which occurred after the Wopmay orogeny West of Hudson Bay , ca. 2.1 1.9 Ga. . The Trans Hudson orogeny resulted from the collision of the Superior craton ... change from plate margin to intraplate processes within an evolving convergent orogeny ... 2008 02 11 ref Similar to the Himalayas, the Trans Hudson orogeny was also the result of continent ... orogeny and the consequent upheaval of the continental crust in the middle Proterozoic eon caused .... During the Wopmay orogeny, subduction occurred as oceanic crust of the Slave craton was subducted beneath an eastward moving continental plate. Likewise, during the Trans Hudson orogeny, rifting at first ... mountain building orogeny . During the opening and then closure of the Manikewan Ocean, the following ... deformation and metamorphism of the Trans Hudson orogeny associated with arc arc and arc continent ... Hudsonian Orogeny. ref name Hollings cite journal author Hollings, Pete and Kevin Ansdell year 2002 ... atlas thot thot blurb.html Category Orogeny Category Cratons Category Historical geology ... more details
Hercynia may refer to The Hercynian Forest . a range of mountains mentioned in several classical sources, in apparently various regions of Europe . Hercynia , a journal published by the Universities and Landesbibliothek of Sachsen Anhalt, which covers ecology and environmental biology. Hercynia may be an early Proto Celtic language Celtic toponym, see Perkwunos . 458 Hercynia , an asteroid See also The Hercynian orogeny a synonym for the Variscan orogeny of the Carboniferous . The Hercynian massifs are part of the Massif Central of France. Disambig Category Celtic toponyms ... more details
. The Variscanorogeny also called the Hercynian orogeny Formation of the mountains of western Iberian ...World geologic provinces The following is a list of Orogeny orogenies organised by continent country, starting with the oldest at the top. North America n orogenies Wopmay orogeny Along western edge of Canadian shield, 2100&ndash 1900 annum Ma . Trans Hudson orogeny Hudsonian orogeny or Trans Hudson orogeny Extends from Hudson Bay west into Saskatchewan then south through the western Dakotas and Nebraska ... during the Proterozoic . Lasted from 2000&ndash 1800 Ma. Penokean orogeny Wisconsin , Minnesota , and Michigan , U. S. A. and southern Ontario , Canada , 1850 1840 Ma. Big Sky orogeny Proterozoic collision between the Hearne craton and the Wyoming craton in southwest Montana, 1770 Ma. Ivanpah orogeny Mojave province, south western USA Yavapai orogeny mid to south western USA, 1760 1700 Ma. Mazatzal orogeny mid to south western USA, circa 1600 Ma. Grenville orogeny Worldwide during the late Proterozoic ... , 1100&ndash 1000 Ma. Image Taconic orogeny.png thumb right 250px Taconic orogeny Caledonian orogeny the East Greenland Orogen , formed from Cryogenian to Devonian the Taconic orogeny Taconic phase in the NE U.S. and Canada during the Ordovician Period. the Acadian orogeny Acadian phase in the Eastern U.S. during Silurian and Devonian Geologic period Period s. Appalachian orogeny , usually seen as the same as the Variscanorogeny in Europe. Appalachian Mountains is a well studied orogenic belt resulting from a late Paleozoic collision between North America and Africa . Taconic orogeny Acadian orogeny Alleghenian orogeny Ouachita orogeny Ouachita Mountains of Arkansas and Oklahoma is an orogenic ... orogeny west across the Mississippi embayment Reelfoot Rift zone. Antler orogeny Ancestral ... orogeny or Ellesmerian orogeny Innuitian Mountains , Canadian Arctic, extending from Ellesmere Island to Melville Island, Canada Melville Island , Mississippian 345 Ma. Sonoma orogeny Rocky Mountains ... more details
continents of Laurussia to the north and Gondwana to the south during the VariscanOrogeny. Some authors think the microcontinent stretched far enough to also encompass the pre Variscan basement of the Armorican ... Geologischen Landesamtes 1 , pp. 1 39. aut Matte, P. 2001 The Variscan collage and orogeny ...Image Hercynian structures Europe EN.svg thumb 350px Most important structures and zones of the VariscanorogenyVariscan or Hercynian Orogeny in Europe. ref Map is based on Franke 1992, 2000 , Matte 2001 , von Raumer et al. 2003 and Walter 2003 ref The Moldanubian Zone is in the regional geology of Europe a tectonics tectonic zone formed during the VariscanOrogenyVariscan or Hercynian Orogeny 400 to 300 million years ago, during the Devonian and Carboniferous periods . The Moldanubian Zone outcrop crops out in the Bohemian Massif and the southern part of the Black Forest and Vosges and contains the highest grade metamorphic rock s of Variscan age in Europe. The Moldanubian Zone was introduced by German geologist Franz Kossmat in 1927. It has a generally higher grade of metamorphism than the Saxothuringian Zone to the northwest. The contact between the two is a thrust fault thrust over which the Moldanubian Zone moved over the Saxothuringian Zone during the VariscanOrogeny. In the east the Moldanubian Zone is thrusted over the Moravo Silesian Zone , which is also generally lower grade. Geology The Moldanubian Zone of the Bohemian Massif can be divided into two tectonic units the Tepl Barrandian Zone or Bohemicum and the Moldanubian Zone sensu stricto Moldanubicum . The last contains large granitoid pluton s and nappe s. Moldanubicum The Moldanibicum or Moldanubian sensu stricto ... These three tectonic units and their contacts are cut off by large batholith intrusions of late Variscan ... in the Variscan Belt , Geological Society of London, Special Publications 179 , pp. 35 61. aut ... of the Variscan and Alpine collisional orogens , Tectonophysics 365 , pp. 7 22. aut Walter ... more details
The Welsh Borderland Fault System is a zone of fault geology faulting and associated fold geology folding which runs northeastwards through Wales from Pembrokeshire through Carmarthenshire and Powys into Shropshire in England . The southern margin of the System is defined by the Church Stretton Fault and Dulas Valley Fault, amongst others whilst its northern margin is defined by the Garth Llanwrtyd Fault Belt in Carmarthenshire. The system was active during the Caledonian Orogeny and was reactivated during the later Variscan Orogeny . ref Geology of the Llandovery District a brief explanation of the geological maps sheet 212 Llandovery ref References reflist Category Geology of Wales ... more details
The Frasnian is one of two faunal stage s in the Late Devonian period. It lasted from 385.3 2.6 million years ago to 374.5 2.6 million years ago. It was preceded by the Givetian stage and followed by the Famennian stage. It is named after the village of Frasnes lez Couvin in Belgium. ref cite web url http www2.ulg.ac.be geolsed site MM title Frasnian mudmounds from Belgium publisher University of Li ge accessdate 2011 02 25 ref Major reef building was under way during the Frasnian stage, particularly in western Canada and Australia . On land, the first forest s were taking shape. In North America , the Antler orogeny Antler and Taconic orogeny Taconic orogenies peaked, which were contemporary with the Bretonic phase of the Variscan orogeny in Europe . North American subdivisions of the Frasnian include Senecan , Sonyea , Sonyean , and West Falls . References Reflist Category Devonian geochronology stub ca Frasni de Frasnium es Frasniano fr Frasnien it Frasniano lv Fr nas st vs hu Frasni nl Frasnien pl Fran pt Frasniano vi T ng Frasne ... more details
The Cwm Llwyd Fault is a Fault geology fault in the Black Mountains, Wales Black Mountains of South Wales . It moved as a sinistral left lateral strike slip fault during the Variscan Orogeny . Together with the Llwyn Celyn Fault it formed a left stepping offset that created a pull apart basin pull apart structure , which preserved the Cwm Llwyd Outlier of Namurian rocks. ref name Walsh cite journal last Walsh first P.T. coauthors Barclay W.T. & Battiau Queney Y. year 2007 title The Cwm Llwyd Outlier, Carmarthenshire, South West Wales Britain s deepest karstic subsidence or Variscan pull apart structure? journal Geological Journal volume 42 issue 1 pages 1 23 doi 10.1002 gj.1061 ref See also List of geological faults of Wales References Reflist coord missing Wales Category Geology of Wales geology stub Wales geo stub ... more details
Infobox mountain name Monte Arcosu photo Monte Arcosu02.jpg photo caption elevation m 948 elevation ref prominence location Sardinia , Italy range Sulcis Mountains coordinates coord 39 11 42 N 8 51 25 E first ascent easiest route Monte Arcosu is a mountain in the Sulcis Mountains Sulcis massif , in southern Sardinia , Italy . It has an elevation of convert 948 m ft 0 . The mountain has a characteristically truncated cone shape, resulting from the differential erosion which followed its formation during the Variscan orogeny . The massif is formed by a graniti c intrusion from the Carboniferous , lying on a Paleozoic schist basement and in turn surmounted by Paleozoic scists. The Variscan orogeny removed the upper schist layer from all the massif s peaks but Monte Arcosu, modelling it and showing the granite along the steep slopes. Sources cite book first Sebastiano last Barca coauthors Felice Di Gregorio chapter Geologia e paesaggio in Sulcis title I Parchi della Sardegna location Cagliari publisher Edisar year 1993 pages 238 240 isbn 88 86004 35 4 Category Mountains of Sardinia Arcosu Sardinia geo stub it Monte Arcosu ... more details
unreferenced date September 2009 Geology of the Alps dablink This article is about the geology of the European Alps . br For the main article see Geology of the Alps . The Aarmassif or Aaremassif German Aarmassiv is a geology geologic massif in the Swiss Alps . It contains a number of large mountain chain s and parts of mountain chains. Name The massif is named after the Aar , a river that has its source in the Aarmassif. Geography The Aarmassif outcrop crops out in the eastern part of the Bernese Alps and the Lepontine Alps , roughly form Leukerbad in the west to the T di in the east. Further east the massif only appears in small window geology windows like the V ttner window between Gigerwald and V ttis in Canton of St. Gallen Sankt Gallen and at the Limmerensee in the same Cantons of Switzerland canton . Tectonics and lithology The Aarmassif is part of the Helvetic zone of the Alps, which consists of material originally from the European tectonic plate . The Aarmassif has Lithology lithologies common for Paleozoic basement geology basement rocks all over Europe, deformation geology deformed and metamorphism metamorphosed during the Variscan orogeny . Younger Mesozoic sedimentary rock s were erosion eroded from this basement as a thrust fault brought the basement to the surface in the Alpine orogeny . Other places, where the European basement crops out in the Helvetic zone, are the mountain chains of the Massif des crins and of Mont Blanc in the France French and Italy Italian Alps. The Rock geology lithologies of the basement rocks are mainly gneiss es, schist s and amphibolite s. These were in some places intruded by Permian granite s after the Variscan orogeny , called Aare granite . During a late phase in the Alpine orogeny in the Tertiary the Aarmassif was tectonic uplift uplifted in the form of a large elongated dome geology dome structure . The overlying limestones of the Helvetic nappes now have a very high Strike and dip dip angle, forming a ridge that a ... more details
the Hercynian orogeny. The oldest rocks of the massif are Neoproterozoic sediments of the Brioverian Supergroup which were deformed and metamorphosed during the Cadomian orogeny. These are overlain ... and intrusion intruded by felsic magmas during the Hercynian orogeny. The massif is cut in three ... Zones . Generally the north was less deformed during the Hercynian orogeny than the south. The South Armorican Zone is considered part of the core of the Hercynian orogeny, comparable to the Moldanubian ... of France Category Geology of France Category Hercynian orogeny Category Terranes es Macizo Armoricano ... more details
Franke W., Haak V., Oncken O. & Tanner D. title Orogenic Processes Quantification and Modelling in the Variscan ... the Devonian and early Carboniferous, as the oceanic crust was subduction subducted . The Variscanorogeny marks the final closure of the Rheic Ocean as the various continental fragments, including ... plates Category Historical continents Category Hercynian orogeny ... more details
the VariscanOrogeny . The Varican Orogeny was a phase of mountain building and Accretion geology .... The result of the VariscanOrogeny was that almost all continental mass became united in a supercontinent called Pangaea . From the Permian period onward the Variscan mountain belt eroded and became partly covered by younger sedimentary rock sediments , with the exception of Variscan massifs like ... the VariscanOrogeny. ref A subdivision into Saxothuringian and Moldanubian zones was first introduced ... more influence on soil formation in such places gley soil s may be found too. As in the other Variscan ... of Laurussia ref Resources Unlike other Variscan massifs in Central Europe the Bohemian Massif is not very ... Quantification and Modelling in the Variscan Belt , Geological Society of London Special Publication ... Ocean, from Avalonian Cadomian Active Margin to Alleghenian Variscan Collision , Geological ... more details
Refimprove date January 2009 The Pan African Ocean is a hypothesized paleo ocean whose closure created the supercontinent of Pannotia . ref cite book last Linnemann first Ulf coauthors R. Damian Nance, Petr Kraft, Gernold Zulauf title The Evolution of the Rheic Ocean From Avalonian Cadomian Active Margin to Alleghenian Variscan Collision publisher Geological Society of America year 2007 page 28 isbn 9780813724232 url http books.google.ca books?id dj9C VvmDwC&pg PA28 ref The ocean may have existed before the break up of the supercontinent of Rodinia . The ocean closed before the beginning of the Phanerozoic Eon, when the Panthalassa ocean expanded, and was eventually replaced by it. See also Pan African orogeny Mirovia References reflist Category Historical oceans Category Proterozoic palaeo geo stub nl Pan Afrikaanse Oceaan nn Det panafrikanske havet zh ... more details
the Lake District and North Pennines . The majority of the rest of England and Wales north of the VariscanOrogenyVariscan Front are considered to constitute the Avalon Composite Terrane . Within ... known as the Caledonoid trend. The VariscanOrogeny main Variscanorogeny The VariscanOrogeny ... is through consideration of the variety of structures resulting from each of several orogeny ... lines of crustal weakness commonly associated with, for example, the Caledonian Orogeny will often predate ... reactivated during later events. The Caledonian Orogeny main Caledonian orogeny The Caledonian Orogeny ... Dodman Start Thrust Lizard Thrust Carrick Thrust The Alpine Orogeny File WealdBasinCrossSection.png ... geology inverted during the Alpine Orogeny forming the Wealden Anticline. Vertical exaggeration 1 5. main Alpine orogeny The Alpine Orogeny began 200 million years ago and continues to the present ... more details
The Cribarth Disturbance is a geological structure forming a lineament which stretches across south Wales from Swansea up the Swansea Valley then northeastwards to Brecon and beyond. It comprises both a series of fault geology faults and associated fold geology fold s which were active during the mountain building period known as the Variscan orogeny . This line of weakness probably featured in the earlier Caledonian Orogeny and perhaps reflects a more ancient line of weakness in the Basement rock basement rocks. It is also known in part as the Tawe Valley Disturbance or the Swansea Valley Disturbance . ref Howells, M.F. 2007 British Regional Geology Wales Keyworth, Nottingham, British Geological Survey ref Influence on the landscape The Disturbance is responsible for a number of significant landscape features along its 50km length. Prominent amongst these is the Swansea Valley , formed both by glacial action during the ice ages and river erosion along this line of weakness in the Earth s crust between Abercraf and Swansea. It is now occupied by the River Tawe . The geologically complex mini mountain of Cribarth also lies on the Disturbance and indeed gives its name to the feature. ref Ordnance Survey Explorer maps 165 Swansea , OL12 Brecon Beacons National Park western area ref ref British Geological Survey 1 50,000 map sheets 230 Ammanford , 231 Merthyr Tydfil , 247 Swansea & accompanying memoirs ref The Caledonian Orogeny The Cribarth Disturbance is one of the southernmost Geological Structure of Great Britain geological features within Britain which can be described as following the Caledonoid trend. The phrase describes a suite of major northeast southwest oriented geological structures associated with the closure of the former Iapetus Ocean in the middle Palaeozoic era and giving rise to the Caledonian Orogeny or mountain building period. The Neath Disturbance and the Carreg Cennen Disturbance are similar features also found in south Wales. The Bala Fault, Men ... more details
1 , pp. 1 39. aut Kroner, U. Hahn, T. Romer, R.L. & Linnemann, U. 2007 The Variscanorogeny ... , Precambrian Research 73 , pp. 235 250. aut Matte, P. 2001 The Variscan collage and orogeny ... Basin . They were slightly metamorphosed during the Hercynian orogeny. The sedimentary sequence ... and Recrystallization geology recrystallized during the Cadomian orogeny in the Ediacaran, 650 ... schist s and marble s rocks that were metamorphosed at high grade during the Hercynian orogeny ..., O. & Tanner, D. eds. Orogenic Processes, Quantification and Modelling in the Variscan Belt , Geological ... Cadomian active margin to Alleghenian Variscan collision , Geological Society of America Special ... Result of large scale Variscan shearing , Tectonophysics 177 , pp. 151 170. aut Oncken, O. 1997 ... the constituents of the Variscan and Alpine collisional orogens , Tectonophysics 365 , pp. ... Hercynian orogeny nl Saxothuringische Zone ... more details
The Eger Graben lang cs Ohersk p kop , lang de Egergraben is a geographical unit in the Czech Republic . It runs southwards, parallel to the Erzgebirge Ore Mountains Kru n Hory and its formation is linked with that of the mountain range. Topography The Eger river Eger flows through the Eger Graben and separates the Ore Mountains from the Kaiserwald and the Doupov Mountains . The trench continues to the northeast along the valley of the B lina river B lina and later, as the North Bohemian Basin , separates the Ore Mountains from the Bohemian Central Mountains , where the River Eger leaves the graben and flows into the Elbe south of the Bohemian Mountains. Geology The Eger Graben is part of the European Cenozoic Rift System and was created geologically on the same principle as the Rhine Rift Valley . It was formed by the almost complete erosion of the Variscan orogeny Variscan Mountains and sits on on a fault block caused by the horizontal pressure of the African continental plate. This block dropped, however, in contrast to the surrounding area. The Ore Mountains are fault block mountains which rise very gently in Germany, but drop very steeply into the Eger Graben. The trench thus follows the main fault line of the Ore Mountains. Sources http pages.unibas.ch earth tecto research dezes ziegler.pdf P. De zes , S.M. Schmid, P.A. Ziegler 2004 Evolution of the European Cenozoic Rift System interaction of the Alpine and Pyrenean orogens with their foreland lithosphere http books.google.co.uk books?id 4 MRc3gWy6cC&pg PA164&lpg PA164&dq limagne graben&source bl&ots 7KpfCq5ge9&sig uwdL6 delHyGjsUgGNRnKERr 0E&hl en&ei 4LK3SuWeMuCg4AbUsul8&sa X&oi book result&ct result&resnum 1 v onepage&q 22eger 20graben 22&f false Peter A. Ziegler 1990 Geological atlas of Western and Central Europe , Volume 2 Category Geography of the Czech Republic de Egergraben ... more details
during the late phases of the Hercynian orogeny. The Rhenohercynian Zone is a part of the northern ... the Hercynian orogeny, the Rhenohercynian zone was folded and thrusted internally. It was thrusted ... onwards. The southern margin of Laurussia was formed during the Caledonian orogeny of the Silurian period ... type mountain chain, the Ligerian orogeny Ligerian cordillera . In the Pragian Siegenian ... period the Hercynian orogeny . The sedimentary rocks in the basin were thrusted in a series ... This was the short Bretonnic phase of the Hercynian orogeny. It was followed, from the Tournaisian .... ref Ziegler 1990 , pp. 37 38 ref During the Sudetic phase Sudetic main phase of the Hercynian orogeny ... in the Variscan belt of Central Europe , in aut Dallmeyer eds. Terranes in the Circum Atlantic Paleozoic ..., O. & Tanner, D. eds. Orogenic Processes, Quantification and Modelling in the Variscan Belt , Geological Society of London, Special Publications 179 , pp. 35 61. aut Matte, P. 2001 The Variscan collage and orogeny 480 290 Ma and the tectonic definition of the Armorica microplate a review ... the constituents of the Variscan and Alpine collisional orogens , Tectonophysics 365 , pp ... more details
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