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Topic: Cadomian Orogeny

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	Marine Geosciences in Bretagne - 2005
		The last orogeny of the Precambrian Era is the Cadomian Orogeny, which formed the Amorican Massif bedrock.
		This formation is composed of sandstones and shales which were deposited and intruded by Cadomian granites that mark the end of the Cadomian Orogeny.
		The end of the Paleozoic is marked by the end of marine sedimentation due to the uplift of the Armorican Massif in the Hercynian Orogeny.
	perso-sdt.univ-brest.fr /~jacdev/ens/pal_brit05.htm (0 words)

	Linnemann
		The Cadomian basement and the Cambro-Ordovician overstep sequence in Saxo-Thuringia is characterized by clastic sedimentation from the Late Neoproterozoic to the Ordovician.
		A hiatus in sedimentation between 540 and 530 Ma (Cadomian unconformity) is related to the Cadomian Orogeny.
		A second gap in sedimentation occurred during the Upper Cambrian (500 to 490 Ma) and is documented by a disconformity between Lower to Middle Cambrian rocks and overlying Tremadocian sediments.
	www.gfz-potsdam.de /pb4/pg2/people/romer/ROMER-36.htm (500 words)

	Mining, Mineralization and Tax Evasion in the Channel Islands.
		In the late Precambrian, during the Cadomian orogeny, acidic to basic igneous rocks intruded the basement and metasediments of the islands to form a number of igneous complexes seen on all of the main islands (Bishop and Bisson 1989).
		The igneous and volcanic rocks of Jersey are calc-alkaline and, in theory, therefore, the geology is suitable for the wide range of metalliferous ore deposits that are associated with orogenic deformation and igneous emplacement.
		To the west is the Western Granodiorite (2,200Ma); in the centre of the island basement rocks have been intruded by the Central Diorite Complex, a series of Cadomian basic to intermediate rocks dated between 600-500Ma, whilst to the east lies the Alderney Sandstone, a feldspathic sandstone of Lower Palaeozoic age.
	www.rosiehardman.com /taxev.htm (3441 words)

	Geology of the British Isles - Wikipedia, the free encyclopedia
		Around 600 Ma, the Cadomian Orogeny (mountain building period) caused the English and Welsh landscape to be transformed into a mountainous region, along with much of north west Europe.
		By the end of the period the various continents of the World had fused to form one super-continent of Pangaea, with Britain in the interior, where it was again subject to a hot arid desert climate, with frequent flash floods leaving deposits that formed red beds, somewhat similar to the later, Triassic New Red Sandstone.
		The Alpine Orogeny that took place about 50 Ma was responsible for the shaping of the Weald south of London, and also the North Downs, South Downs and Chiltern Hills.
	en.wikipedia.org /wiki/Geology_of_the_United_Kingdom (2733 words)

	CJO - Abstract - Proterozoic and Cambrian successions in Upper Silesia: an Avalonian terrane in southern Poland
		Tectonic deformation and metamorphism to greenschist grade in these Precambrian strata must have occurred in the Proterozoic, and are attributed to the Cadomian orogeny because similar Cadomian basement complexes occur in the adjoining Brno Massif and in the East Avalonian and Armorican terranes.
		Based on the recognition of Cadomian age basement, the distribution of trilobites and acritarchs and the tectonostratigraphic relationships to adjacent areas, the Upper Silesia terrane is interpreted to be a distal segment of East Avalonia that in Cambrian times faced Iberia.
		The Intra-Sudetic Fault zone and the Kraków-Myszków Fault Zone contain Early Palaeozoic rocks deformed during the Caledonian orogeny, and mark the boundary between the Caledonian accretionary belt and areas unaffected by this orogeny.
	journals.cambridge.org /article_S0016756897007504 (0 words)

	Ercall Quarry
		Position of Cadomian arc and Southern Britain at the end of Precambrian?
		At the end of the Precambrian, begin of the Cambrian (544 Ma) subduction seems to have stopped (no volcanic or metamorphic rocks of Cambrian age are found in Southern Britain), and erosion took over.
		Neoproterozoic-Paleozoic Geography and Tectonics, by Ian Dalziel, with reconstruction map of earth at 545 Ma
	www.ougseurope.org /rockon/ontherocks/ercall.asp (0 words)

	D'Lemos, Strachan and Topley (1990) The Cadomian orogeny
		D'Lemos, Strachan and Topley (1990) The Cadomian orogeny
		Geology, Stratigraphic; Orogeny; Congresses; Precambrian; France; Armorican Massif
		To view the the latter's ratings, click on Chapters/Papers/Articles in the STATISTICS box, select a publication from the list that appears, and then click on either Quality or Interest in that publication's STATISTICS box.
	www.getcited.org /?PUB=102953701&showStat=Ratings (81 words)

	Discover Torteval’s Geology – A guided walk by George Le Couteur
		It was formed some 646 million years ago during a mountain building event known as the Cadomian orogeny.
		This event is known as the "Variscan Orogeny".
		The Variscan Orogeny had a profound effect on the French and British landscapes, but in our area, the only significant event was the formation of the Lamprophyre dykes 296 million years ago.
	www.cwgsy.net /private/georgelec (5730 words)

	Cuadernos de Geología Ibérica, 2004; 30 Special Issue. The Ossa-Morena Zone (Iberian Massif): Geological findings at ...
		[R] From the Cadomian orogenesis to the Early Palaeozoic Variscan rifting in Southwest Iberia / Simamcas, F. Expósito, I. or, A. Martínez Poyatos, D. González Lodeiro, F. The imprint of the Cadomian orogeny in SW Iberia has been a controversial issue over the last two decades.
		For some authors Cambrian bodies are still related to the Cadomian cycle; for others the existence of a Lower Cambrian detritic-carboanted platform is considered the end of the Cadomian cycle, therefore these granites are connected to the Lower Paleozoic extensional event, that is considered the beginning of the Variscan cycle.
		As a whole, the diverse Variscan metallogenesis of the OMZ is interpreted as a vertical continuum in a continental crust undergoing transpresssional strain.
	www.ucm.es /BUCM/compludoc/S/10411/0378102X_1.htm (2156 words)

	geography of the united kingdom - Article and Reference from OnPedia.com
		Large quantities of volcanic lava and ash known as the Borrowdale Volcanics covered both Wales and the Lake District, still seen in the form of mountains such as Helvellyn and Scafell Pike.
		In the Silurian Period, between 425 and 400 Ma, the Caledonian fold mountains formed (the Caledonian Orogeny), covering much of what is now the UK to perhaps 8,000 feet (2,500 m) thick.
		Volcanic ashes and lavas deposited during this period are still found in the Mendip Hills and in Pembrokeshire.
	www.onpedia.com /encyclopedia/geography-of-the-united-kingdom (2843 words)

	Geology of the United Kingdom
		600 MA, the Cadomian Orogeny (mountain building period) caused the English and Welsh landscape to be transformed into a mountainous region, along with much of north west Europe.
		In the early Cambrian period the volcanoes and mountains of England and Wales were eroded as the land became flooded, and new layers of sediment were laid down.
		The Alpine Orogeny that took place about 50 Ma was also responsible for the shaping of the Weald south of London.
	www.askfactmaster.com /Geology_of_the_United_Kingdom (2201 words)

	The Geological and Tectonic framework of Europe
		The oldest Precambrian basement provinces of western and central Europe, therefore, comprise the East European and Hebridean cratons, the stable Cadomian blocks of the London Platform and the East Silesian Massif, and the Caledonian, Variscan and Alpine fold belts.
		The Cadomian orogeny between 650-550 Ma (late Precambrian) was the last in the sequence of events that formed the crystalline basement rocks of Europe.
		Cadomian crustal elements are also recognised in the Alpine fold belt, based on their geology and radiometric age dating.
	www.gsf.fi /publ/foregsatlas/article.php?id=4 (8844 words)

	Tectonophysics. (Site not responding. Last check: )
		Linnemann, R.L. Romer, The Cadomian Orogeny in Saxo-Thuringia, Germany: geochemical and Nd-Sr-Pb isotopic characterization of marginal basins with constraints to geotectonic setting and provenance, Tectonophysics 352 (1-2) (2002) pp.
		Jean Chantraine, Emmanual Egal, Denis Thiéblemont, Elisabeth Le Goff, Catherine Guerrot, Michel Ballèvre, Pol Guennoc, The Cadomian active margin (North Armorican Massif, France): a segment of the North Atlantic Panafrican belt, Tectonophysics 331 (1-2) (2001) pp.
		Adnand Bitri, Jean Pierre Brun, Catherine Truffert, Pol Guennoc, Deep seismic imaging of the Cadomian thrust wedge of Northern Brittany, Tectonophysics 331 (1-2) (2001) pp.
	www1.elsevier.com /cdweb/journals/00401951/viewer.htt?viewtype=keywords&rangeselected=13 (783 words)

	The Variscan Orogeny in SW Cornwall. (Site not responding. Last check: )
		The basement comprised metamorphic, plutonic and volcanic rocks forming a magmatic arc, lying between the Rheic Ocean, to the south, and the Iapetus Ocean (extending to 20°S), to the north (Durrance, 1998).
		Across Cornubia it is difficult to locate definitive Caledonian structures, but it has been noted that many mineral lodes have a Caledonian (NE-SW) or Cadomian (E-W) trend and their host fractures may have been influenced by underlying structures in the basement (Durrance, 1998).
		The onset of deformation in the Variscan Orogeny resulted in the trapping of large volumes of connate/meteoric water by pore space collapse and loss of permeability.
	www.phdcsm.freeserve.co.uk /Variscan.htm (5210 words)

	Vrije Universiteit, FALW: Jarich J. Beetsma (1995)
		The inferred presence of at least 30 % Pan-African / Cadomian juvenile components in the LPC metaturbidites contrasts with the scarcity of juvenile components related to younger Paleozoic orogenic activity (e.g.
		The geochemistry of Late Proterozoic / Paleozoic terrigenous metasediments, Hercynian granitoids and Paleozoic mantle-derived units discussed in this thesis illustrate the profound importance of the ~700-550 Ma Pan-African / Cadomian orogeny in the cru stal evolution of the Iberian Massif.
		Crustal growth related to this orogenic period is recorded by large volumes of mantle-derived material added to pre-existing crust of Middle Proterozoic age and it was apparently accompanied by significant geochemical modification the lithospheric mantle.
	www.falw.vu.nl /Onderzoeksinstituten/home_page.cfm/subsectionid/F5AFA357-67A4-49D5-9AA95112B1E83DA6/fileid/2EAD273A-0FC3-48E4-BFA3367368364158/pageid/B7E88FF1-993F-4770-A3F480D42B6CEF90 (957 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.
		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.
		Previous studies show that the Pan-African Cadomian orogenic activity is recorded in the Iberian Massif by the presence of 700-550 Ma detrital zircons in metasediments with more radiogenic Nd isotope compositions and the occurrence of meta-igneous rocks with 600±50 Ma.
	www.the-conference.com /JConfAbs/4/104.html (13260 words)

	Sengor Lecture (Site not responding. Last check: )
		An exception is the Istanbul Zone in NW Turkey that has a Cadomian basement.
		The Pan African evolution had the style of a Turkic type orogeny that ended with major strike-slip faulting and basin-and-range type extension that created the Hormuz Salt Basins.
		The Jabal al-Akhdar orogeny in Cyrenaica is part of the same event.
	www.geosc.uh.edu /burke/sengor_abstract.htm (460 words)

	Animated History of Avalonia (Site not responding. Last check: )
		The Goochland granulite terrane; remobilized Grenville basement in the eastern Virginia Piedmont.
		U-Pb geochronology of the Upper Proterozoic Cadomian orogeny in the northern Armorican Massif, France.
		The Brioverian (Upper Proterozoic) and the Cadomian orogeny in the Armorican Massif.
	www.virtualexplorer.com.au /journal/2001/03/murphy/paper7.html (2861 words)

	U-Pb geochronology and Sm-Nd isotopic composition of Proterozoic gneisses, Channel Islands, UK Journal of the ...
		This crystallization age demonstrates that the protolith was a Cadomian intrusion and that penetrative deformation and amphibolite-facies metamorphism in the northern Channel Islands were Cadomian in age.
		The presence of 2170 +/- 7 Ma zircon xenocrysts within the Sark orthogneiss, combined with its initial epsilon^sub Nd^(615)=-9.5, are strong evidence that pre-Cadomian basement was a significant source component, and that documenting the extent and age of pre-Cadomian basement may be possible by indirect geochemical methods.
		The Cadomian orogenic belt of the North Armorican Massif is considered to have evolved within a suprasubduction continental margin setting during late Neoproterozoic time (Auvray et al.
	www.findarticles.com /p/articles/mi_qa3721/is_199807/ai_n8787277 (871 words)

	abs37
		Together with the adjacent rocks, the marbles of the Lądek-Śnieżnik Metamorphic Unit (LSMU), West Sudetes, SW Poland underwent a polyphase structural evolution that occurred in metamorphic conditions changing from medium-grade to low-grade and in deformation regimes changing from ductile to semi-brittle.
		Cadomian versus younger deformations in the basement of the Moravo-Silesian Variscides, East Sudetes, SW Poland: U-Pb SHRIMP and Rb-Sr age data
		It follows from this study that in the East Sudetes basement rocks, structures which are often classified as Variscan may in fact be Cadomian and that the Cadomian record in these rocks is richer than previously assumed.
	www.ing.pan.pl /sudewww/abs37.html (936 words)

	[No title]
		The inferred presence of at least 30 % Pan-African / Cadomian juvenile components in the LPC metaturbidites contrasts with the scarcity of juvenile components related to younger Paleozoic orogenic activity (e.g.
		The geochemistry of Late Proterozoic / Paleozoic terrigenous metasediments, Hercynian granitoids and Paleozoic mantle-derived units discussed in this thesis illustrate the profound importance of the ~700-550 Ma Pan-African / Cadomian orogeny in the cru stal evolution of the Iberian Massif.
		Crustal growth related to this orogenic period is recorded by large volumes of mantle-derived material added to pre-existing crust of Middle Proterozoic age and it was apparently accompanied by significant geochemical modification the lithospheric mantle.
	www.geo.vu.nl /~isotopen/pages/4_publications/phd_abstracts/phd_beej.html (944 words)

	[No title]
		Although orogeny is defined in terms of geography and the rock record, time also plays a role in the sense that the plate tectonic forces that caused crustal stresses and thermal perturbations have a beginning and an end.
		The close temporal and spatial association of Liscomb gneisses/granulites and granites, their major and trace element compositions, and their overlapping isotopic characteristics confirm the hypothesis that high-grade meta-morphism and generation of granitic melt are complementary processes.
		Respective correlation of the Acatecan and Mixtecan orogenies with the Taconian and Acadian orogenies of the Appalachians implied that the Acatlan Complex was a vestige of the Iapetus Ocean.
	geoweb.tamu.edu /Faculty/Miller/BVMabstracts.htm (11445 words)

	Ruhla Crystalline Complex (Mid-German Crystalline Rise)
		These formations are built up of ortho- and paragneisses, whose protoliths were formed and/or deposited in at least two distinct plate tectonic environments, and experienced different tectono-metamorphic overprints during the Variscan orogeny between 370 and 330 Ma.
		It is speculated that these granitoids intruded into an island arc located at the southeastern margin of East Avalonia, prior to the formation of the Rhenohercynian basin (Zeh and Wunderlich, 2003).
		Subsequently, during the Variscan Orogeny these granites underwent an intensive structural and metamorphic overprint together with their surrounding country rocks, which commonly consist of pelitic to psammitic metasediments intercalated with basic and felsic volcanic rocks (Zeh, 1996; Hansch and Zeh, 2000; Wunderlich and Zeh, 2000).
	www.mineralogie.uni-wuerzburg.de /zeh/ruhla.html (1281 words)

	Geological Society - Online Bookshop - Bookshop View Details (Site not responding. Last check: )
		The Cadomian orogeny was first defined over 60 years ago to describe the earth movements which resulted in an unconformity between an Upper Proterozoic supracrustal sequence, namely the Brioverian, and Cambrian molasse in the north Armorican region.
		This volume is the first to collect together the views of workers from a variety of geological disciplines working on a range of aspects of Cadomian geological evolution.
		Lithological, geochemical, geochronological and palaeomagnetic data presented allow petrogenetic and evolutionary models to be erected and assessed and correlations to be considered within the Cadomian belt so that global geodynamic evolutionary models may be postulated.
	www.geolsoc.org.uk /template.cfm?name=bookshop_details&action=details&id=146 (210 words)

	[No title] (Site not responding. Last check: )
		The pluton's root zone would correspond to a likely thin, subvertical feeder structure initiated near the orientation of regional s1 at the time of emplacement.
		During the Variscan orogeny the pluton was tilted and underwent localized brittle-ductile strain in relation to shear-zone deformation in the footwall of a major ductile thrust.
		Tilting permits the observation and study of a vertical profile of the intrusion.
	www.agu.org /pubs/abs/tc/1999TC900037/1999TC900037.html (300 words)

	[No title]
		Power, G. “Geochemical differences between the Cadomian granites of Mancelia and the St Malo migmatites, Armorican Massif, France.” J. Geol.
		“The Cadomian granites of Mancelia, northeast Armorican Massif of France: relationship to the St. Malo migmatite belt, petrogenesis and tectonic setting.” Precambrian Research 51: 393-427.
		Late Precambrian M-type granitoid genesis in the Cadomian belt of NW France.
	www.sgmb.univ-rennes1.fr /references/GranitesarmorA.doc (2620 words)

	Timing of Cadomian deformation and magmatism within La Hague, NW France Journal of the Geological Society - Find ...
		The Cadomian belt of the North Armorican Massif (NW France and British Channel Islands) contains fragments of c.
		Deformation, plutonism and metamorphism within the Cadomian belt is believed to have occurred at different times in different parts of the belt between c.
		The region thus offers the potential to derive information on the conditions and timing of deformation and metamorphism of the basement, as well as constrain a record of Cadomian plutonism and deformation in this sector of the orogenic belt.
	findarticles.com /p/articles/mi_qa3721/is_200503/ai_n13476473?lstpn=article_results&lstpc=search&lstpr=external&lstprs=other&lstwid=1&lstwn=search_results&lstwp=body_middle (0 words)

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