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Topic: Obduction

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	Obduction
		Obduction is the overlapping of a continental crust by oceanic crust.
		Obduction results in a continental plate being forced into the asthenosphere, where it will begin to liquefy.
		The resulting pressure may be released through a volcanic eruption.
	www.ebroadcast.com.au /lookup/encyclopedia/ob/Obduction.html (130 words)

	Oman Ophiolite Emplacement Discussion (Site not responding. Last check: 2007-10-12)
		Obduction requires depression of the continental lithosphere due to the load of the oceanic lithosphere as it encroaches upon the continental margin.
		Once the obduction ceased the subsided continent rebounded isostatically and the ophiolite slid westward due to gravity.
		Michard, A., Boudier, F., and Goffe, B., 1991, Obduction versus subduction and collision in the Oman case and other Tethyan settings, in Peters, T., Nicolas, A., and Coleman, R. G., eds., Ophiolite Genesis and Evolution of the Oceanic Lithosphere: Dordrecht, Ministry of Petroleum and Minerals, Sultante of Oman, p.
	darkwing.uoregon.edu /~drt/Oman/mhhoman/omanemplacement.html (1724 words)

	Photang thrust sheet: An accretionary complex structurally below the Spontang ophiolite constraining timing and ...
		Abstract: The pre-collisional tectonic evolution of the north Indian continental margin is best recorded in the few ophiolite complexes preserved, the largest of which occurs in the Spontang area of the Himalayas.
		The structural relations of the allochthonous thrust sheets with the sediments of the north Indian margin have been mapped in detail and show clear evidence that obduction occurred in the late Cretaceous.
		Obduction of the Spontang ophiolite therefore records a separate tectonic episode in the Ladakh Himalaya.
	www.findarticles.com /p/articles/mi_qa3721/is_199909/ai_n8859329 (1137 words)

	The main domains along the Guadiana transverse (Site not responding. Last check: 2007-10-12)
		This ophiolite complex is tectonically superposed over Paleozoic sequences of OMZ by obduction phenomena’s, along the southern boundary of the Iberian Autochthon, and is bounded towards the North, mainly by latter variscan intrusions of Beja Igneous Complex or Beja Massif (BIC/BM).
		This deformation phase is related to the obduction and ophiolite emplacement upon the crystalline footwall of the OMZ (Fonseca, 1995; Fonseca et al., 1999).
		The overall evidences (tectonic, metamorphic and geochemical) leads to the interpretation of MPC as an obduction related “mélange” (Araújo et al., 2005), induced by the first deformation phase, between the southern boundary of the OMZ and the ophiolitic nappes (Figure 13).
	www.virtualexplorer.com.au /journal/2005/19/borrego/domains.html (3067 words)

	Arc-ophiolite obduction in the western Kunlun range (China): Implications for the Palaeozoic evolution of central Asia ... (Site not responding. Last check: 2007-10-12)
		Arc-ophiolite obduction in the western Kunlun range (China): Implications for the Palaeozoic evolution of central Asia
		The Western Kunlun Range, located along the northern periphery of the Tibetan plateau, is a 1000 km long NW-SE mountain belt extending from the Pamir syntaxis in the west to the Altyn Tagh and the East Kunlun Range in the east (Fig.
		Accordingly, we propose a scenario of Late Palaeozoic arc-ophiolite obduction, forming an Andean-type margin in the northern Western Kunlun Range in the Late Permian.
	www.findarticles.com /p/articles/mi_qa3721/is_200209/ai_n9141120 (999 words)

	Continental Evolution Research Group \| Geophysical Imaging of an Obduction Plate Margin, Oman
		Understanding the mechanism of obduction (emplacement of oceanic crust onto continental margins) is fundamental to our knowledge of plate tectonic processes, earth evolution and dynamics.
		The primary hypothesis tested in this project is whether obduction simply involves (a) continent-vergent, piggy-back style overthrusting of the margin by the ocean basinal facies and ophiolite nappe (Figure 1 A or B), or (b) underthrusting directed toward the Arabian continental shield (Figure 1 C).
		The dashed line shows a low resistivity zone that extends under the Jabal Abyad mountains that may reflect conduction along the Hatat schist, which is highly deformed basement in the core region of the large-scale, NE-facing Saih Hatat fold-nappe.
	www.ees.adelaide.edu.au /research/geology/cerg/projects/convergent_margin/obduction_plate.html (436 words)

	25sudbur
		The mechanism of folding is not known, but, as in the case of the passive margin sediments of Papua-New Guinea, it may have been induced by the obduction of oceanic crust following the establishment of a Huronian passive margin.
		The structural architecture of the Huronian is similar to that of the rocks of the Lower Proterozoic Hamersley passive margin located on the southern margin of the Archean Pilbara craton of Western Australia.
		In Canada an equivalent obduction event is represented by the ophiolites of the Ungava Peninsula.
	instruct.uwo.ca /earth-sci/200a-001/25sudbur.htm (6031 words)

	p52a in fm00
		Obduction occurs when the lithosphere is too buoyant to subduct, a situation usually only found when a back-arc basin is caught between two colliding continental masses.
		The series of outward-dipping thrusts in SE Thetis Regio is characteristic of obduction and provides the first direct evidence of significant horizontal shortening by obduction on Venus.
		Numerical modelling is used to constrain the thickness of the crust and lithosphere and to calculate the degree of shortening.
	www.agu.org /cgi-bin/SFgate/SFgate?&listenv=table&multiple=1&range=1&directget=1&application=fm00&database=/data/epubs/wais/indexes/fm00/fm00&maxhits=200&="P52A" (2067 words)

	Paleocene–Eocene record of ophiolite obduction and initial India-Asia collision, south central Tibet
		Ar ages of ∼63 Ma, which we attribute to cooling during slip along the shear zone and southward obduction of the melange.
		Melange obduction was coeval with the development of an angular unconformity within the Gangdese forearc basin to the north (between late Maastrichtian time and ∼62 Ma).
		Alternatively, in concert with the conventional view of Eocene collision initiation, the obducted oceanic rocks may be of intraoceanic origin, while coeval changes in Gangdese forearc sedimentation may be a consequence of an increase in the rate of ocean-continent convergence following the demise of the intraoceanic subduction zone.
	www.agu.org /pubs/crossref/2005/2004TC001729.shtml (452 words)

	Amazon.com: Obduction: Books (Site not responding. Last check: 2007-10-12)
		level, while the other plate is forced beneath it; in obduction, one plate remains at a constant level, while the other...
		Continental obduction or shortening occurs as the Indian and Asian plates collide.
		This astonishing obduction of the oceanic lithosphere occurred as the thin Arabian continental...
	www.amazon.com /s?ie=UTF8&keywords=Obduction&tag=httpexplaguid-20&index=books&link_code=qs&page=1 (878 words)

	Samail Ophiolite Obduction and New Structural Constraints from Saih Hatat and Hawasina Windows (Site not responding. Last check: 2007-10-12)
		Their presence 1) indicates that for at least part of the history the platform to slope carbonates sequences were "thrust" to the northeast, and 2) requires non-passive margin behaviour for part of the ophiolite obduction.
		This is an important part of the tectonic evolution (and ophiolite obduction) that has not been previously recognised.
		Therefore, models involving craton-directed thrusting with domal culminations related to deep-seated, footwall and lateral ramps are too simplistic for the overall tectonic evolution of this part of the Arabian Peninsular.
	searchanddiscovery.net /documents/abstracts/cairo2002/images/gray.htm (276 words)

	IngentaConnect Tectonic rotations during the Chile Ridge collision and obduction... (Site not responding. Last check: 2007-10-12)
		Tectonic rotations during the Chile Ridge collision and obduction of the Taitao ophiolite (southern Chile)
		Systematic sampling for paleomagnetic study was performed to understand the complex obduction processes of the ophiolite onto the forearc of the South American Plate.
		The clockwise rotation, inferred from high coercivity remanent magnetization vectors, was attributed to a ridge collision event and the counterclockwise rotation, inferred from the low coercivity remanent magnetization vectors, was attributed to an accommodation phase into the South American forearc during obduction and final emplacement of the ophiolite.
	www.ingentaconnect.com /content/bsc/iar/2005/00000014/00000004/art00023 (408 words)

	SIU Geology - Eric C. Ferré - Alteration of peridotites
		On Earth, large volumes of peridotites are brought to the surface as obduction ophiolites (Oman, Newfoundland, Papua, New Caledonia).
		The obduction process generally leads to further alteration by continental aqueous fluids along structural discontinuities.
		Finally, exposure to the surface results in supergene serpentinization, the formation of weathering rinds, and the development of soils on peridotites that, particularly under hot and humid climates, leads to the formation of peridotitic laterites.
	www.science.siu.edu /geology/people/ferre/laterite.html (485 words)

	Exploring the Reason for Earthquakes and Volcanoes
		Introduce the students to the concepts of subduction and collision (obduction).
		Note that the word "obduction" is somewhat out-of-date among geologists; they use collision instead.
		However, we have found that students really like the word "obduction," so you may want to introduce both terms.
	www.msnucleus.org /membership/html/k-6/pt/plate/4/ptpt4_3a.html (475 words)

	16obduct
		In this case, eugeosynclines would be foreland basins, and the 'flysch' of eugeosynclines would represent sediment derived from the overriding oceanic material and the older continental-derived slope and rise sediments that were dragged back onto the continent by the migrating oceanic slab.
		zones of geosynclines therefore mark the locus of obduction, and subsequent continent-continent collision.
		Ordovician 'Lime' turbidites: slope and rise deposits dragged over the edge of the continent during obduction of the Bay of Islands ophiolite.
	instruct.uwo.ca /earth-sci/200a-001/16obduct.htm (509 words)

	Google Earth Community: What are these colours in Cyprus?
		This entire range is a world-class ophiolite obduction zone where deeper plate rock (lower oceanic) has been shoved on top of continental rock.
		I can't imagine what it must be like there now, with the influx of refugees and the latest flare ups between the Greek Cypriots and the Turkish Cypriots.
		From Wikpedia: Obduction is the overthrusting of continental crust by oceanic crust or mantle rocks.
	bbs.keyhole.com /ubb/showflat.php/Cat/0/Number/716355/Main/76139 (502 words)

	Mineral Deposits of Canada - Regional Metallogeny Ni-Cu-PGE: Southern Quebec ophiolite belt
		The only structures that can be strictly assigned to obduction processes are those found associated with the metamorphic sole (up to 1 km thick), which occurs at the base of the ophiolite (Fig.
		Although the TMOC was obducted by 477-460 Ma, and was being actively eroded soon afterwards, the common and widespread occurrence of felsic pyroclastic rocks at the base and within the St-Daniel Mélange (Schroetter et al.
		This deformation was interpreted as being related to obduction by Turcotte (1999).
	gsc.nrcan.gc.ca /mindep/metallogeny/ni_cu_pge/sqob/index_e.php (9155 words)

	Body
		Key concepts: We discussed the concepts of subduction, accretion and obduction and how they help to construct continents as well as volcanic island arcs.
		Maybe it was because when you started talking about the trench, I couldn't see how a river could affect a trench hundreds of miles beyond the continental margin.
		Secondly, I had not realized that plates, while being subducted, as well as sediment on the plates, could be pushed onto the overriding plate [obduction] and not just drawn under it.
	www.mtsu.edu /~cdharris/smpljrnl.htm (942 words)

	Tectonics of Oman (Site not responding. Last check: 2007-10-12)
		Comment on "Tectonic Setting of Ophiolite Obduction in Oman" by Robert Coleman.
		Kinematics of oceanic thrusting in the Oman ophiolite: model of plate convergence.
		Obduction versus subduction and collision in the Oman case and other Tethyan settings, in Peters, T. et al, (eds), Ophiolite Genesis and Evolution of the Oceanic Lithosphere, Ministry of Petroleum and Minerals, Sultanate of Oman, p.
	darkwing.uoregon.edu /~drt/Oman/renee.html (526 words)

	EEFAQOphio
		which the obduction concept was founded and followed by a
		- only the dip of the contact- steep diapiric or flat obduction.
		Papuan Ophiolite is the type area on which the obduction
	www.4threvolt.com /EEFAQOphio.html (886 words)

	Journal Contents - Preliminary study of Cenozoic hydrothermal alteration and platinum deposition in the Oman Ophiolite. (Site not responding. Last check: 2007-10-12)
		The next major tectono-stratigraphic unit is the Semail nappe consisting of ophiolitic harzburgite, separated by a discontinuous dunite layer from overlying layered gabbro and a sheeted dyke unit of dolerite dykes with chilled margins.
		These rocks were tectonically emplaced over the basement during obduction in the Cretaceous (e.g.
		Superimposition of the ophiolite sequence on underlying sediments created quartzite, garnetiferous muscovite schist, chlorite schist and amphibolite collectively known as the metamorphic sole.
	www.virtualexplorer.com.au /journal/2002/06/wilde/paper.html (1186 words)

	Obduction, subduction and collision as reflected in the Upper Cretaceous-Lower Eocene sedimentary record of western ...
		Obduction, subduction and collision as reflected in the Upper Cretaceous-Lower Eocene sedimentary record of western Turkey -- OKAY et al.
		Obduction, subduction and collision as reflected in the Upper Cretaceous–Lower Eocene sedimentary record of western Turkey
		Ophiolite obduction over the passive margin of the
	geolmag.geoscienceworld.org /cgi/content/abstract/138/2/117 (466 words)

	OPHIOLITE FORMATION AND OBDUCTION DURING THE PHANEROZOIC AND LATE PRECAMBRIAN (Site not responding. Last check: 2007-10-12)
		These maps illustrate the changing location of ancient spreading centers, subduction zones, island arcs, seamounts, and oceanic plateaus since the late Precambrian.
		An attempt was made to show both the timing and location of ophiolite obduction, and a speculative estimate of where the oceanic crust comprising the ophiolite originally formed.
		All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.
	gsa.confex.com /gsa/2006AM/finalprogram/abstract_113792.htm (354 words)

	Oxford Eprints - Photang thrust sheet: an accretionary complex structurally below the Spontang ophiolite constraining ...
		Oxford Eprints - Photang thrust sheet: an accretionary complex structurally below the Spontang ophiolite constraining timing and tectonic environment of ophiolite obduction, Ladakh Himalaya, NW India
		Corfield, R I and Searle, M P and Green, O R (1999) Photang thrust sheet: an accretionary complex structurally below the Spontang ophiolite constraining timing and tectonic environment of ophiolite obduction, Ladakh Himalaya, NW India.
		The pre-collisional tectonic evolution of the north Indian continental margin is best recorded in the few ophiolite complexes preserved, the largest of which occurs in the Spontang area of the Himalayas.
	eprints.ouls.ox.ac.uk /archive/00000794 (318 words)

	Inaugural Article: Orogeny can be very short -- Dewey 102 (43): 15286 -- Proceedings of the National Academy of Sciences
		collision, with which ophiolite obduction is rarely associated
		Progressive obduction of the oceanic arc and its SSZ ophiolite
		metamorphic complex contrasts to obduction of the cold Josephine
	www.pnas.org /cgi/content/full/102/43/15286 (4052 words)

	PRE-OBDUCTION STRUCTURES OF THE THETFORD MINES OPHIOLITIC COMPLEX (TMOC), QUEBEC : IMPLICATIONS FOR OCEANIC CRUST ... (Site not responding. Last check: 2007-10-12)
		Post-obduction structural features consist of NE-trending Acadian open folds and reverse faults, Late Silurian- Early Devonian backfolds and normal faults such as the Saint-Joseph fault (SJF).The TMOC occurs in the hanging wall of the SJF.
		Structures attributed to ophiolite obduction onto the Laurentian Margin consist mainly of a metamorphic sole and related structures at the base of the mantle section.
		Pre-obduction structures show two different sub-vertical orientations, NS and NW-trending.
	gsa.confex.com /gsa/2001AM/finalprogram/abstract_26821.htm (347 words)

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