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Topic: Exotic terrane

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	Terrane - Wikipedia, the free encyclopedia
		A terrane in paleogeography is an accretion that has collided with a continental nucleus, or "craton" but can be recognized by the foreign origin of its rock strata.
		The boundaries of a terrane are usually represented by crustal faults.
		In the lithospheric scheme of plate tectonics, a terrane is not a microplate, but a piece of crust "riding" atop another plate.
	en.wikipedia.org /wiki/Terrane (253 words)

	Basics--Exotic Terranes
		Terrane accretion is most common at convergent plate boundaries, but it may be possible for a terrane to be brought from an exotic location along a transform plate boundary.
		Terranes were a mystery to geologists until plate tectonic theory allowed them to see how pieces of the crust could be moved and added to a continent far from where they had originated.
		The geologic history of an accreted terrane is different from the geologic history of nearby rocks that are native to the continent, indicating that it is exotic.
	www.wenval.cc /rdawes/Basics/exotics.html (1047 words)

	PNW Focus Page 7
		The fusulinid fossils in terranes of the Northwest are called tethyan fusulinids because they are types that existed in the large sea known as the Tethys Sea on the east side of the supercontinent Pangaea.
		The Intermontane terranes are exposed in the Pacific Northwest in the Okanogan Highlands of Washington, west of the Kootenay Arc.
		The subduction process that brought in the Intermontane terranes, and the accretion of the terranes themselves, caused the edge of the continent to the east to undergo extensive folding, faulting, metamorphism, and widespread intrusion by granites.
	www.wenval.cc /rdawes/FocusPages/PNWterranes.html (3130 words)

	ESS 301 - Lecture Key Points
		Along with paleobiology, paleomagnetism is a principal way to figure out where an exotic foreign terrane originated.
		The first foreign terrane to arrive here is called THE INTERMONTANE terrane ("between the mountains"), which sits between the Rockies to the East and the Cascades to the West.
		The Intermontane superterrane (superterrane #1 for our class) is made up of 5 distinct terranes that originated somewhere to the west and south perhaps as far as equatorial Asia (we know this from the fossils and magnetism).
	faculty.washington.edu /sechern/ess301/key/030418.html (445 words)

	Geology 208: Quiz #1
		A terrane is a crustal block or fragment that preserves a distinctive geologic history that is different from the surrounding areas and that is usually bounded by faults.
		These terranes were formed in the eastern Pacific Ocean, far from their present position, and were transported on lithospheric plates to be accreted on the edge of the continent.
		The volcanic arc terranes are similar to the accreted island-arc terranes termed Wrangellia that lie between Alaska and Vancouver Island.
	spot.pcc.edu /~ksutton/GEO207/Geological_Periods/Mesozoic/Part4_Mesozoic_notes.html (2141 words)

	The Southern Appalachians - the Alleghanian and Hercynian
		Rocks east of the Inner Piedmont belonging to the Carolina terrane are relatively low metamorphic grade, and contain rare fossils of Atlantic/Avalonian provenance indicating that the terrane is exotic to North America.
		terrane is a migmatite complex of paragneiss, amphibolite, and granitoid gneiss, late Proterozic to early Cambrian in age.
		A-475 Duncan, J.G. Stratigraphic correlation of Paleozoic sequences from the Suwanee Terrane of Florida, Morocco, and the Avalon terrane of Newfoundland: Evidence for Gondwanan stratigraphic linkage: - North Florida basin is composed of Lower to Middle Paleozoic siliciclastic sediments.
	instruct.uwo.ca /earth-sci/300b-001/sapp.htm (2944 words)

	NATURE AND TIMING OF MULTIPLE(?) TERRANE ACCRETION ALONG THE EASTERN/WESTERN BLUE RIDGE (TALLADEGA BELT) BOUNDARY, ... (Site not responding. Last check: 2007-10-11)
		An Ordovician age for the HG would indicate an earlier thrusting event juxtaposing an exotic volcanic terrane against the TG shelf sediments prior to metamorphism, becoming subsequently metamorphosed with the TB, and then being overprinted by the middle to late Carboniferous HLF and the final suturing of the Pangean supercontinent.
		Tight age constraints dictate that an exotic HG terrane be emplaced no earlier than the late Devonian to earliest Mississippian(Tournasian) age of the upper TG metasediments and prior to the late Mississippian metamorphic age(~328Ma).
		Additionally, an exotic origin for the HG would require a shallow thrust boundary between it and the TG which is concordant to TG stratigraphy along a footwall-hanging wall flat >100km in length and >10km in width.
	gsa.confex.com /gsa/2001SE/finalprogram/abstract_4653.htm (525 words)

	The Exotic Suwannee Terrane, Southeastern Alabama
		Examined blocky calcite cement (in cathodoluminescence shown to the left) from the Suwannee Terrane (southeastern Alabama, Florida) is interpreted to represent a variable physical mixture of calcite cement that precipitated from Ordovician middle-to-high latitude meteoric and marine fluid end-members.
		Tobin, K.J., and Walker, K.R., 1997, Blocky calcite cement from the Suwannee Terrane: evidence for mixing of moderate to high latitude meteoric and sea water.
		Tobin, K.J., 2002, Calcite cement from the Suwannee Terrane and Ordovician paleogeography.
	cees.tamiu.edu /cees/faculty/suwannee/suwannee.html (109 words)

	[No title] (Site not responding. Last check: 2007-10-11)
		In Portugal, these include: (1) the Iberian terrane, which occupies most of the Massif, shows Gondwanian affinities at least until the late Proterozoic and is considered the Iberian autochthon (it includes the Central Iberian and Ossa-Morena zones, cf.
		The latter is essentially a metasedimentary unit with minor representation of ophiolite melanges and volcanic rocks with a typical N-MORB chemistry (from the base upwards: serpentinites, flaser gabbros, massive and banded gabbros, sheeted dikes, and pillow basalts) (Quesada et al., 1994; Ribeiro and Silva, in press).
		The Iberian terrane (which includes the Central Iberian Zone and the Ossa Morena Zone) seems to extend from northernmost Iberia to south of the Nazaré canyon.
	www.ga.gov.au /odp/publications/149_SR/chap_01/c1_5.htm (1692 words)

	Study Guide for Geologic Time (Site not responding. Last check: 2007-10-11)
		An exotic terrane created by a seamount accreted to a continental margin would be composed __________.
		The Chulitna terrane, Alaska, is a __________ that consists of interbedded, basaltic, lava flows and deep-water, marine limestones.
		Does terrane accretion generally occurs along a divergent boundary between a continental plate and an oceanic plate.
	www.unlv.edu /Colleges/Sciences/Geoscience/pub/snelson/GEY101/study_guide_mtbuilding.html (531 words)

	Paleomagnetism of the Pavón Formation
		The paleomagnetically determined position of the Cuyania terrane during the interval of the deposition of the Pavón Formation is indicated.
		It indicates that this area of the Cuyania terrane during the time of depositon of the Pavón Formation was at a latitude of 25.7° ± 2.9°.
		This figure illustrates the possible position of the Cuyania terrane on a paleolatitudinal band that corresponds to the data from the Pavón Formation based on the paleomagnetic pole obtained and its uncertainties.
	www.unt.edu.ar /fcsnat/INSUGEO/geologia_17/93.htm (1871 words)

	Amateur Geologist Structured Geological Glossary: Plate Tectonics
		An exotic terrane is one that has been transported into its present setting from some distance.
		Plutons of roughly the same age which that intruded several tectonic terrane after the terranes were faulted together.
		The pluton do not really sew the terranes together, but they help record when terranes were assembled.
	www.amateurgeologist.com /content/glossary/tectonics/tectonics.html (1219 words)

	Untitled Document (Site not responding. Last check: 2007-10-11)
		This is a unique and thoroughly documented pre-Andean exotic terrane on the western margin of South America.
		Both the pre-Andean margin of Gondwana (Famatinian magmatic arc) in the east and the suspect Precordillera/Cuyania terrane in the west were involved in the mobile belt at this latitude.
		The Precordillera/Cuyania terrane is a keystone of South America geology because it is widely considered that it rifted away from Laurentia and was then accreted to the pre-Andean margin of Gondwana during the Famatinian orogeny.
	cig.museo.unlp.edu.ar /gondwana/excursions.htm (1838 words)

	TERRANES AND TERRANE ACCRETION IN THE SOUTHERN APPALACHIANS: AN EVOLVED WORKING HYPOTHESIS (Site not responding. Last check: 2007-10-11)
		Appalachian terranes have also been defined on this basis, but many of the small terranes defined in the orogen are partially based on incomplete or incorrectly interpreted data.
		The Suwannee terrane is another exotic terrane beneath parts of Florida, Georgia, and Alabama containing African basement and fossiliferous Paleozoic cover.
		The Allatoona-Hayesville-Gossan Lead fault is a Taconian terrane boundary that produced obduction of ophiolites (?), arc volcanics, and eclogite onto Laurentia and the Ordovician eastern BR plutons.
	gsa.confex.com /gsa/2001SE/finalprogram/abstract_4597.htm (480 words)

	Bedrock Geology of New York City: More than 600 m.y. of geologic history
		The Hartland is widely interpreted as exotic to ancestral North America, accreted during the Taconian orogeny in Ordovician time.
		This exotic terrane began to ride up over North American crust, depressing it; in response, a deepening basin formed along the North American margin.
		The overlying Hartland terrane must account for a large proportion of the 12 kbar pressure experienced by the Manhattan Prong (Figure 4C).
	pbisotopes.ess.sunysb.edu /reports/ny-city (3240 words)

	Geology of North Cascades National Park
		The Swakane terrane, made up of the Swakane Biotite Gneiss, is one of the region’s most significant geologic mysteries.
		Even though both the Swakane and surrounding rocks of the Chelan Mountains terrane are thoroughly metamorphosed and much of their original relationship is obscured, some evidence indicates the Chelan Mountains terrane was thrust over the Swakane.
		If the Swakane Gneiss is Precambrian in age, it is indeed an exotic terrane, one located many miles west of the nearest Precambrian rocks exposed on the older parts of North America.
	wrgis.wr.usgs.gov /docs/parks/noca/t7swakane.html (391 words)

	Early Ordovician (Arenig) brachiopods from volcaniclastic rocks of the Famatina Range, Northwest Argentina Journal of ...
		This evidence is consistent with the hypothesis that the Precordillera is an exotic terrane accreted to the Gondwana margin (Ramos and Keppie, 1999, and collection of papers there-in).
		Although there is a general agreement that the Precordillera is a far-traveled, Laurentian-derived terrane, the timing and mechanisms of its accretion to the Gondwana margin are matters of debate.
		By the end of the Arenig and especially during the Early Llanvirn the Precordillera terrane became almost completely isolated from large paleocontinents such as Gondwana and Laurentia.
	www.findarticles.com /p/articles/mi_qa3790/is_200303/ai_n9167965/pg_9 (615 words)

	Groome GES 602: Analog Model Results
		Photo 1: This shows the critical wedge developed prior to the collision with the exotic terrane (which is visible in the top third of the photo).
		A number of small thrusts have developed in the terrane which are accomodating the deformation.
		The terrane is still distinguishable from the earlier accretionary prism.
	www.geology.um.maine.edu /geodynamics/analogwebsite/Projects2003/Groome_2003/HTML/Geology.html (375 words)

	vhs video: exotic (lands-tales mysterious lifestyles) (Site not responding. Last check: 2007-10-11)
		As exotic and untamed as their lush surroundings, they will defend their home (and the secret shrine to their "Sister")- to the death...
		Exotic dancing is much more than "dancing sexy", it is learning how to reach deep within yourself, find your own inner beauty and grace, and combine it into a sensual movement.
		Visit Australia, Hawaii, San Francisco, and many more exotic locations as Warren Miller shares a summer of sailing in his film "The Outer Reaches of Sailing." Warren Miller's lively and humorous narration will add to your enjoyment of sailing aboard Sydney 18s, Hobie 33, Prindle Catamarans, and wave hopping in Hawaii.
	www.very-clever.com /vhs/exotic (1086 words)

	Tracking Wrangellia
		A popular and extensively studied exotic terrane identified in the Pacific Northwest is named Wrangellia.
		Stretching from the Wrangell Mountains east of Anchorage, Alaska, through Vancouver Island, to Hells Canyon, Idaho, Wrangellia is one of the most extensively displaced exotic terranes in North America.
		This indicates these layers were accumulated after the terrane began to collide with North America.
	www.emporia.edu /earthsci/student/pachuta1/page4.htm (354 words)

	Synergy Learning - Article Archives (Site not responding. Last check: 2007-10-11)
		The directors have used the work of three scientists, who are interviewed for the video, to make the story comprehensible and informative.
		Exotic Terrane also provides a fine example of scientists collaborating to solve a massive puzzle.
		Exotic Terrane is available in VHS format for purchase or rent from Bullfrog films, PO Box 149, Olney PA 19547.
	cf.synergylearning.org /DisplayResource.cfm?selectedresource=125 (317 words)

	Untitled (Site not responding. Last check: 2007-10-11)
		An suspect (or exotic) terrane is a region where there is geological continuity- the rocks are genetically related and they appear to have formed in a similar region of the earth.
		Many mountain belts are composed of several terranes that border each other- i.e.
		Because their crustal density is too low to be subducted they become attached (called welded or "docked") to the larger continental crust.
	www.geology.ufl.edu /Class_Notes/gly2010/mountains.html (395 words)

	Watershed Biology Example
		These imported "terranes" are called "exotic" since they are so different from surrounding rock.
		It is possible that a small plate with subduction zone volcanoes (an exotic terrane known as the Shelburne Falls Arc), collided with Laurentia (the continental plate carrying modern-day North America) before Bronson Hill arrived.
		The former magma chamber granite was extensively metamorphosed and as well as the whole region has been uplifted and eroded by pre- and post-glacial river action.
	www.umass.edu /tei/mwwp/drwa/biology.html (517 words)

	Untitled Document
		All of the samples for this study came from the coastal section where the Arisaig Group is most completely preserved.
		Rocks in northern mainland Nova Scotia were deposited on the Western Avalonia microplate; an exotic terrane floored by Late Proterozoic arc-related intermediate to felsic volcanics of Gondwanan affinity.
		By late Ordovician, West Avalonia (and East Avalonia = Anglo-Welsh Basin) had drifted away from Gondwana, northward across the Iapetus Ocean, and fell under the same climatic influences which were shaping Laurentia and Baltica.
	www2.bc.edu /~strother/beck/geology.html (237 words)

	[No title] (Site not responding. Last check: 2007-10-11)
		One of the distinctive units of the Northern Sierra Terrane is the Mississippian Picayune Valley Formation, which is composed of chert-and quartz-rich conglomerate, quartzose sandstone, and fl pelite.
		There are two possibilities for the origin of rocks of the Northern Sierra Terrane, exotic and non-exotic.
		Detrital zircons of the Roberts Mountains allochthon would imply that the Picayune Valley Formation was in sedimentary proximity to the western coast of North America, as the Roberts Mountains allochthon was emplaced prior to deposition of the Picayune Valley Formation.
	www.geo.arizona.edu /geodaze/1996/spurli.html (238 words)

	Exotic Terrane \| Bullfrog Films
		The geological term "exotic terrane" refers to a group of rocks that has attached itself to a tectonic plate and migrated away from its place of origin.
		This fascinating program documents the latest geological discoveries in the Pacific Northwest, where fossils of an equatorial coral reef are being found along the ridges of Hells Canyon in eastern Oregon.
		EXOTIC TERRANE contains the dramatic story of the scientists who pieced together the history of these rocks, and offers an explanation of the tectonic activity that makes such exotic displacements possible.
	www.bullfrogfilms.com /catalog/et.html (301 words)

	USGS CMG InfoBank: Terranes
		Such fragments are commonly described by geologists as "exotic, " "suspect, " or "accreted" terranes.
		The term "terrane" refers to an area of rocks having continuous strata or structure and a distinctive composition.
		The boundary between an accreted terrane and the main body of the continent may be marked by a fault zone or in places by a belt of oceanic rock, which was not subducted but caught in the squeeze between the colliding land masses.
	walrus.wr.usgs.gov /infobank/programs/html/school/moviepage/06.01.18.html (283 words)

	Earth 2nd Edition > Glossary > Letter e
		The process (involving uplift and erosion) that returns deeply buried rocks to the surface.
		A block of land that collided with a continent along a convergent margin and attached to the continent; the term “exotic” implies that the land was not originally part of the continent to which it is now attached.
		The theory that the whole Universe must be expanding because galaxies in every direction seem to be moving away from us.
	www.wwnorton.com /internal/earth2/glossary/e.htm (933 words)

	Florida More Exotic Than The Travel Agents Promise
		When pre-Cenozoic land masses are fitted together, assuming the truth of continental drift, an awkward overlap arises that suggests that Florida was not always where it is today;
		There are no known source rocks in the southeastern U.S. that old; Africa and South America are likely sources of such zircons.
		Other exotic terranes have been found in western North America, making the continent a veritable pastiche.
	www.science-frontiers.com /sf057/sf057g13.htm (252 words)

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