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Topic: Farallon Plate


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In the News (Sun 26 May 19)

  
  Plate Tectonics of Montana and Northern Rockies - Basin and Range   (Site not responding. Last check: 2007-11-05)
The plate configuration responsible for the most of the mountain ranges in Montana, Wyoming, daho was subduction of the oceanic (Farallon) plates under the western margin of North America.
The Farallon plate was generated at a oceanic ridge in the Pacific Ocean and consumed at the trench adjacent to the West Coast.
The extension is consistent with the motion of the Pacific plate to the northwest and the role of the San Andreas fault as a transform fault.
www.3rivers.net /~dbaker/plate_tec/plate13.htm   (268 words)

  
  North American Plate - Wikipedia, the free encyclopedia
The southerly side is a boundary with the Cocos Plate to the west and the Caribbean Plate to the east.
The westerly side is a convergent boundary with the subducting Juan de Fuca Plate to the north and a transform boundary with the Pacific Plate to the south along the San Andreas Fault.
The Juan de Fuca, Cocos, and Nazca Plates are remnants of the Farallon Plate.
en.wikipedia.org /wiki/North_American_Plate   (261 words)

  
 Farallon Plate - Wikipedia, the free encyclopedia
The Farallon Plate was an ancient, wholly oceanic tectonic plate, which began subducting under the west coast of the North American Plate— then located in modern Utah— as Pangaea broke apart during the Jurassic period.
Over time the central part of the Farallon Plate completely subducted under the southwestern part of the North American Plate.
The remains of the Farallon Plate are the Juan de Fuca Plate subducting under the northern part of the North American Plate, the Cocos Plate subducting under Central America and the Nazca Plate subducting under the South American Plate.
en.wikipedia.org /wiki/Farallon_Plate   (126 words)

  
 Plate-Driving Forces   (Site not responding. Last check: 2007-11-05)
Prior to the early Aptian, the Farallon plate was subducting northward beneath subduction zones in Japan, Alaska, and California (Fig.
This change in Farallon plate motions was coincident with evidence of uplift along these plate margins during the Aptian (Fig.
We propose that the change in Farallon plate motion was caused by increased friction along the northern boundaries of the Pacific basin (Fig.
www.jhu.edu /~eps/faculty/conrad/resproj/methane/methane.html   (677 words)

  
 List of tectonic plates - Wikipedia, the free encyclopedia
Tectonic plates are pieces of the Earth's crust and uppermost mantle, together referred to as the lithosphere.
The plates are around 100 km (60 miles) thick and consist of two principal types of material: oceanic crust (also called sima from silicon and magnesium) and continental crust (sial from silicon and aluminium).
The surface of the Earth consists of 14 major plates and 38 minor ones, for a total of 52 plates.
en.wikipedia.org /wiki/List_of_tectonic_plates   (208 words)

  
 Plate Tectonics of Montana and Northern Rockies - Volcanism
Volcanism is part of the activity of a convergent plate margin, especially one in which an oceanic plate is subducted under a continental plate.
When the velocity of North America (and the convergence rate between the Farallon plate and the North American plate) slowed down, the subducted Farallong plate was no longer forced up against the underside of the overlying North American plate.
Since the Kula Plate was subducted under Western Canada and Alaska and has completely disappeared and only a small remnant of the Farallon plate remains today (off the coast of Washington, Oregon, and southern British Columbia), it is difficult to precisely locate the Farallon/Kula boundary.
www.3rivers.net /~dbaker/plate_tec/plate12.htm   (1062 words)

  
 Ocean Crust Geochemistry-Morro Ridge
The Morro ridge, together with the remnants of the Monterey plate, was captured by the Pacific plate prior to subduction and preserved thus providing information on the composition of 30 My old ocean crust in the eastern Pacific.  A major reorganization event occurred at approximately 30 Ma on the Pacific-Farallon spreading system in the NE Pacific.
This period of changes in plate motions resulted in the propagation of transform faults and the break up of the section of the Farallon Plate between the Murray and Pioneer transform faults into smaller pieces with independent motions.
As spreading of the new Monterey Plate progressed, the ridge reoriented to accommodate the new spreading direction developed.
www.mbari.org /crust/Morro.htm   (285 words)

  
 Plate Motions
Notice that the plate motion is NOT orthogonal to the mid-ocean ridge, but at an angle; this will be an important reason why the oceanic plates move northward, causing the "yet-to-be-created" San Andreas fault to lengthen.
Above is the plate reconstruction at 28 m.y., immediately after "first contact" of the ridge and subduction zone.
As soon as the ridge contacts the subduction zone, and the Farallon plate is essentially split into two parts, we redefine the plates as the Juan de Fuca plate (labeled; the northern subduction zone) and the Gorda plate (not labeled; the southern subduction zone).
www.geology.wisc.edu /~g109/Additional/plate_motions.htm   (618 words)

  
 McLaughlin Reserve
One continent-building convergence of plate occurred in the late Jurassic and Cretaceous period (about 140 to 100 million years ago), when the oceanic Farallon plate, coming from the west, subducted beneath the North American continental margin (see Figure 3-1).
As the Farallon plate descended beneath the North American continent, hot fluids derived from the down going plate caused melting in the overriding continental plate, producing a chin of volcanoes on the continent that were very similar to present-day Cascade volcanoes.
The material on the downgoing Farallon plate, mostly marine sediments, were scraped off against the leading edge of the continental plate to create a complex of diverse rock known as the "Franciscan mélange" or complex.
nrs.ucdavis.edu /mclaughlin/naturalhis/geology.htm   (2694 words)

  
 Mountain ranges of the western U.S.
The oceanic plates adjacent to the west coast were subducting to the east until roughly 15 Ma (not shown).
Along the "West Coast" subduction zone, the Farallon plate was converging at a low angle with the coast, causing pieces of North America and other oceanic crustal fragments to slide northwards along the western edge of the continent.
This change fundamentally altered the forces that were acting along the plate boundary on the western edge of North America, with east-directed convergence that prevailed during Farallon plate subduction changing to northwest-directed Pacific plate movement parallel to the West Coast.
www.geology.wisc.edu /~chuck/Classes/Mtn_and_Plates/mtns_westernUS.html   (2447 words)

  
 Farallon Plate - olelog - by Ole Nielsen
The Farallon plate was an enormous oceanic plate located west of the Americas during the Cenozoic and Mesozoic eras.
It is thought that much of the plate initially went under North America (particularly the western United States and southwest Canada) at a very shallow angle, creating much of the mountainous terrain in the area (particularly the American Rocky Mountains).
A large fragment of the subducted plate is believed to presently be in the mantle under eastern North America.
my.opera.com /nielsol/blog/2007/03/22/farallon-plate   (375 words)

  
 t13a in wp04
The Paleo oceans are modelled by creating "synthetic plates" whose locations and geometry is established on the basis of preserved M-sequence magnetic lineations, paleogeography, regional geological data and the rules of plate tectonics.
Plate boundaries, which are introduced and modified in time and space, give only little room for alternative plate model solutions.
This low rigidity may be due to cracking and thermal alteration of the plate during emplacement of the seamounts or due to inherited structure created by loading the plate on young seafloor near the EPR.
www.agu.org /cgi-bin/SFgate/SFgate?&listenv=table&multiple=1&range=1&directget=1&application=wp04&database=/data/epubs/wais/indexes/wp04/wp04&maxhits=200&="T13A"   (1588 words)

  
 [No title]   (Site not responding. Last check: 2007-11-05)
The Juan de Fuca Plate, which is a remnant of the northern part of the Farallon Plate, is now subducting in an easterly direction beneath North America (from northern California to Vancouver Island).
Because of the persistent northerly movement of the Pacific Plate it is probable that this boundary moved north in the ensuing millions of years, such that it was north of Vancouver Island by the time the Kula plate eventually disappeared beneath North America.
It appears likely that the Kula Plate subducted at a relatively steep angle, so that the Canadian Rockies are primarily comprised of thrusted sedimentary sheets with relatively little contribution of continental uplift, while the American Rockies are characterized by significant continental uplift in response to the shallow subduction of the Farallon Plate.
www.mala.bc.ca /~earles/farallon-kula-may00.htm   (659 words)

  
 HPCC Insights - Rebuilding the world   (Site not responding. Last check: 2007-11-05)
The effort hinged on the notion that plates are the cold surface of the mantle.
Plates are particularly active under Alaska, the Pacific Northwest, western South America and Japan.
The new plate riddle arose from Bunge's fall 1998 move to Princeton as assistant professor of geosciences.
beowulf.gsfc.nasa.gov /ESS/insights/vol14/story1.htm   (1944 words)

  
 Main Heading Goes Here   (Site not responding. Last check: 2007-11-05)
Where the plate is subducted we simply consider it to be no longer relevant to our problem and thus replace it by a convergent boundary.
The point that is at the junction between plates A, B and C  (junction of the trench and the two transform faults is a triple junction.
The breaking up of the Farallon plate is a formidable problem that has been solved by the hodograph method.
www.uni-mainz.de /FB/Geo/Geologie/Geophysik/Lithosphere/Kinematics.htm   (717 words)

  
 The Challis Episode: The Demise of the Kula Plate
Over this period, the ridge between the Kula Plate and the Farallon Plate to the south appears to have slowly moved northward up the coast, eventually fragmenting into pieces as the Farallon Plate exercised its dominance.
The eastern block of the Kula Plate was continuously subducted to the north underneath the southern exposure of the accreted terrane belts between 57 and 40 million years ago.
As this was completed and the Kula Plate faded into history and the Farallon Plate resumed its reign along the North American margin off the Washington and southern British Columbia coasts.
www.washington.edu /burkemuseum/geo_history_wa/The%20Challis%20Episode.htm   (1635 words)

  
 The Review - Something went down
The Juan de Fuca plate to the north in the Pacific Northwest, and the Coco plate to the south off the coast of Central America are small remnants of the larger Farallon plate, still subducting under the continental plates.
As ocean plates dive under continental plates, sea floor sediments are scraped off the diving plate and accrete to the continental plate.
Meanwhile, under the continental plate, magma accumulates and is released as lava from volcanoes, adding to the heat in this active zone of tectonic activity.
www.zwire.com /site/news.cfm?BRD=1680&dept_id=40285&newsid=15341420&PAG=461&rfi=9   (655 words)

  
 Continental Drift and Plate Tectonics
Basically, the Pacific Plate is sliding northwest parallel to the coast of North America.
The plate between North America and the Pacific Plate is called the Farallon Plate.
The present Cocos, Nazca and Gorda Plates are its descendants.
www.uwgb.edu /dutchs/platetec/kula.htm   (583 words)

  
 Geological Society of America - Penrose Conference - 1999
Subduction of the Phoenix-Pacific ridge beneath the Antarctic plate, which led to attachment of the Chatham Rise and Campbell Plateau to the Pacific plate, was compared to the breakup of the Farallon Plate and its effects on western North America.
Fred Davey presented seismic profiles across the Pacific-Antarctica plate boundary in New Zealand which image the crustal structure of the westward-subducting Pacific plate in the North Island, the continental collisional orogen in the central South Island, the transition zones in between, and oblique northeastward subduction of Tasman Sea crust beneath Fiordland.
At least 75% of the Australia-Pacific plate boundary motion is accommodated along the narrow high-strain zone associated with the Alpine fault, the rest is distributed across a 150–200-km-wide zone east of the Alpine fault; Jarg Pettinga and John Bradshaw led two field trips to examine aspects of the plate boundary.
www.geosociety.org /penrose/99pcrpt2.htm   (2126 words)

  
 ESS 301 - Lecture Key Points
These three plates were separated respectively by the Kula-Farallon ridge (the divergent zone between the Kula and Farallon plates); the Kula-Pacific ridge (the divergent zone between the Kula and Pacific plates); and, the Pacific-Farallon ridge (the divergent zone between the Pacific and Farallon plates).
As the North American drifted westward (from the divergent motion on the Mid-Atlantic Ridge), it drew closer to the Kula-Farallon ridge and the Kula Plate.
At about 70 million years ago the Kula plate was essentially next to North America and heading northward.
faculty.washington.edu /sechern/ess301/key/050511.html   (291 words)

  
 Mount Diablo:
A third, smaller plate, the Farallon plate stretched between the two.
As the ocean floor (the Pacific plate) began sliding underneath what is now California (the North American plate), it forced the Farallon plate and sections of the Pacific plate beneath the North American plate.
The region's sea drained as the plate rose.
www.sfgate.com /cgi-bin/article.cgi?file=/getoutside/archive/1997/04/01/geology.DTL   (455 words)

  
 Slip of state | The San Diego Union-Tribune
The North American plate, encompassing both the exposed continent and adjacent sea, is pushing west, driven by tectonics.
In its path are several other plates: the huge Farallon, the Aluk, the Kula and a smallish plate in the south called the Pacific.
The Pacific plate has grown considerably, its girth increased by stolen bits of the North American plate and robust activity along undersea rifts, which add new crust and fuel the plate's movement.
www.signonsandiego.com /uniontrib/20050511/news_lz1c11plate.html   (1596 words)

  
 juan_de_Fuca_general
The Farallon Plate is believed to have played a very important role in the development of the western North American continent.
Toward the end of the Farallon plate portions of the Farallon plate were entirely subducted under the North American plate and the Pacific-North American plate boundary began to dominate the western U.S. The Pacific plate has different characteristics and a different vector (tending NE related to North American plate motion) then the Farallon plate.
The remnant of the Farallon which was not entirely subducted in the north of the Pacific-North American plate transform boundary (at a point named for the juncture of the three tectonic plates: Mendocino Triple Junction) was one solid continuous Juan de Fuca plate.
www.colorado.edu /GeolSci/Resources/WUSTectonics/PacNW/juan_de_Fuca_general.html   (757 words)

  
 Geog390 California geologic history
During the Mesozoic subduction, magma rose up from beneath the descending plates, causing the formation of chains of andesitic volcanoes at the surface and plutons of granitic magma beneath them.
During this time the Farallon plate was subducted and consumed beneath the North American Plate.
Portions of the Farallon plate, along with oceanic sediments of volcanic and terrestrial detritus origin, were subducted briefly and then rose to be accreted against the North American plate, forming what we call today the Franciscan Formation.
www.sonoma.edu /users/f/freidel/california/390geology.htm   (681 words)

  
 On the origin of Hawaii
This is different to the usual model for a hotspot as being derived from the mantle or core remote from the influences of plate tectonic processes and thus superimposed on plate processes, with little interaction between the two.
The shallow model is along the lines of the "plate model" for the Earth proposed by Anderson (2005) and the "alternative Earth" of Hamilton (2003).
Clouard, V. and A. Bonneville, 2005: Ages of seamounts, islands and plateaus on the Pacific plate, in G.R. Foulger, J.H. Natland, D.C. Presnall and D.L. Anderson, eds., Plates, Plumes, and Paradigms, Geol.
www.mantleplumes.org /Hawaii2.html   (3110 words)

  
 Pacific Hemisphere Plate
The Pacific plate is moving northwest toward the subduction zones of the Aleutians and the western Pacific island arcs.
In the late Cretaceous, 85 million years ago, there were several oceanic plates within the Pacific basin: the Pacific plate was a smallish southern plate with the Aluk, Farallon, and Kula plates spreading away from it.
It moved steadily northeastward as new sea floor was accreted onto the edge by sea floor spreading between the Pacific and Farallon plates.
emvc.geol.ucsb.edu /download/pacnorth.php   (416 words)

  
 Raising the Rockies - new theory of origin of Rocky Mountains Discover - Find Articles
To explain the volcanic shutdown, geologists have proposed that the Farallon plate changed its trajectory abruptly in mid-descent; the plate's dive became less steep, and it scraped up against the underside of North America and pushed up the Rockies.
Maxson and Tikoff believe that the Farallon plate's dive beneath North America was blocked when a large chain of islands on its upper surface jammed against the North American plate.
Trapped against North America and pressured from the west and south by the Farallon plate, Baja BC broke off from the Farallon and darted north, on top of a large fragment of the Farallon called the Kula plate.
www.findarticles.com /p/articles/mi_m1511/is_n4_v18/ai_19227823   (813 words)

  
 Ozalaybey and Savage, JGR
The correspondence between the fast directions and the present plate tectonic deformations suggest that mapping upper mantle deformation through seismic anisotropy is a viable method, and that asthenospheric flow may be a significant contributor to seismic anisotropy.
This correlation indicates that the E-W fast direction might be explained by the subducted oceanic plate, presumably the remnants of the Farallon plate, assuming the frozen-in anisotropy is oriented E-W. However, this correlation does not explain the absence of anisotropy at ORV, which is also situated within the marginal domain.
Station ORV is located near the estimated southern edge of the Gorda plate (Severinghaus and Atwater, 1989; Jachens and Griscom, 1983), which is part of the remnant of the Farallon plate.
www.seismo.unr.edu /htdocs/students/OZALAYBEY/JGR/jgr.html   (7883 words)

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