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Topic: Orogenic

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		OROGENIC participated in the 4 th UM Industry Showcase which was held at University Malaya on 25 th to 26 th February 2006.
		OROGENIC 's participation was as part of its long term commitment to support the higher learning institution in line with its larger corporate social responsibility programme.
		This is also to support the objective of the showcase itself which is to bring together graduates and graduating students from various universities and colleges (both public and private) to their prospective employers from the industry as well as an opportunity for sponsor companies to provide industrial training and recruitment prospects.
	www.orogenic.com.my /home.aspx (850 words)

	[No title]
		The term "tectonostratigraphic terrane" implies that terranes recognized in Phanerozoic orogenic belts are characterized first of all as a distinctive stratigraphy and stratigraphic sequence of geologic complexes that formed in specific geodynamic settings (geodynamic complexes), as well as by the time and peculiarities of deformational, metamorphic, and magmatic events.
		Terranes in many of the orogenic belts are interpreted as having migrated several thousands of kilometers before accretion to a continent, and having traveled on "the back" of oceanic lithosphere that was subducted beneath a continental margin or an island arc.
		In the analysis of orogenic belts in the context of plate tectonics the term "suture" (or "suture zone") is widely used and is defined as a tectonic expression of the zone of collision (Howell, 1989).
	pubs.usgs.gov /of/1999/of99-165/data/TERMAP/TERMAP5.DOC (5777 words)

	Orogenic Andesites
		Virtually all andesites are associated with a subduction zone where oceanic crust underthrusts a continent or has done so in the past, the andesites generally becoming more potassic as well as richer in Cs, Rb, Ba, U and Th inland from the subduction zone in regions of thicker crust.
		However, some orogenic lavas (mainly dacites-rhyolites) form where two continental masses are compressing each other, as in Tibet, Turkey etc. These tend to be very potassic and may have been formed by partial melting of the lower crust.
		In general the trends in orogenic series are iron-enriched in the juvenile arcs, (sometimes called a "tholeiitic" trend) becoming richer in alumina and poorer in Fe-Ca-Mg in the mature sectors of the older continents.
	www.geokem.com /Andesite-summary.html (1830 words)

	Mesozoic History of Arizona
		Although these orogenic events affected sedimentation in Arizona, the actual orogenic front (magmatic arc and adjacent highlands) associated with each orogeny was rather distantly removed from the state (Utah-Nevada-southeastern California for the Sonoman; southern and southeastern United States for the Ouachita).
		The Late Triassic and Jurassic of Arizona is characterized by the development of a volcanic arc as revealed in Jurassic volcanic and plutonic rocks in southern Arizona.
		The seaway formed in response the Sevier orogenic belt as it advanced to the east and was eroded.
	web1.shastacollege.edu /geoscience/histories/Az/Mesozoic/mz_histAz.html (2327 words)

	Chapter 7 Notes : Mountain Building and Drifting Continents
		Orogenic Belts are defined as regions of intense folding and faulting accompanied by granitic intrusions and metamorphism.
		Orogenic belts denote areas of present or former mountain ranges and, as we shall later see, mark the collision sites of lithospheric plates.
		Early theories of orogenic belts and mountain building (pre 1950’s) did not as yet recognize the concepts of plate tectonics, seafloor spreading or lithospheric plates.
	www.uh.edu /~geos6g/1376/tectonics7.html (2147 words)

	Interactions Between Exhumation, Climate, and Orogenic Growth II - Tectonophysics [T]
		A robust implication is that, for a given set of initial conditions, orogen response to an increase in the erosional efficiency will be faster than that to a change in accretionary flux, which, in turn, will be faster than that to a decrease in erosional efficiency.
		The transient response time is determined to have a sub-linear dependence on the details of the erosion rule and the rheology of the orogenic wedge, varying by less than a factor of two for a wide range of model parameters.
		The analytical model predicts that at an active orogen and in a cooling climate, the "glacial buzzsaw hypothesis" produces an instantaneous increase in the rate of erosion, and that this increase can lead to a doubling in both rates of erosion and uplift.
	www.agu.org /meetings/fm04/fm04-sessions/fm04_T33D.html (3139 words)

	2000 Abstracts
		Similar characteristics of the Precambrian orogenic gold ores to those of Phanerozoic age have led to arguments that "Cordilleran-style" plate tectonics were also ultimately responsible for the older lodes.
		The two broad episodes of Precambrian continental growth, and associated orogenic gold-veining, are presently best explained by major mantle overturning in the hotter early Earth, with associated plumes causing extreme heating at the base of the crust.
		The existence of a Middle Jurassic foredeep subsequently uplifted and eroded during the Sevier orogeny is compatible with an orogenic belt to the west and provides a plausible explanation for the missing westward thickening wedge.
	www.dregs.org /abs2000.html (4709 words)

	Orogeny
		Result is an orogenic belt in the middle of a continent.
		The two sides of the orogenic belt are separated by a suture marked by blueschist metamorphism, melange, ophiolites and major faults.
		Sediment eroded from the orogenic belt accumulates in the trench and is intensely deformed as the plates converge.
	www.uwgb.edu /dutchs/platetec/orogeny.htm (1334 words)

	Orogenic Gold Deposits
		The aim of this Workshop, organised by BRGM (France) and the University of Geneva (Switzerland) and co-sponsored by GEODE and GeoFrance 3D, was to bring together specialists on mesothermal/orogenic gold deposits and on Variscan geology, metallogeny and geodynamics.
		The geodynamic evolution of the European Paleozoic orogen and its bearing on ore deposits, whereby the most important ones formed in the late stages, during the intracontinental evolution of the Variscan belt following the main collision (M. Faure).
		In some cases, orogenic gold deposits were formed during a very tight time range, such as in the Massif Central about 310 Ma (context of continent-continent collision).
	www.gl.rhbnc.ac.uk /geode/Orleans3.html (1096 words)

	Orogeny Summary
		In transpressional orogens (e.g., the Mesoproterozoic Albany Mobile Belt of Western Australia or the Tertiary Spitsbergen fold and thrust belt, Svalbard, Norway), lateral displacement between plates occurs in addition to folding and thrusting.
		Transpressional orogens are created by the oblique convergence between two continental plates and do not necessitate closure of an ocean.
		Extension in the middle to lower crust in a thrust-thickened orogen may result from convective removal or peeling away (delamination) of part of a lithospheric root.
	www.bookrags.com /Orogeny (1998 words)

	Mountain Building and Plate Tectonics
		Figure 21.7: Orogenic Belts are regions of intense folding and faulting accompanied by granitic intrusions and metamorphism which result from mountain building processes.
		Orogenic belts therefore denote areas of present or former mountain ranges and, as we shall later see, mark the collision sites of lithospheric plates.
		Failure or collapse of the crust, in turn, caused the enclosed strata to crumple and thus form mountains as surface expressions of the deformed strata.
	www.uh.edu /~geos6g/1330/tectonics.html (2029 words)

	Introduction (Site not responding. Last check: 2007-10-15)
		The span of geologic history contained within the Caledonian mountain belt spans from a Neoproterozoic passive margin through ocean formation and closure, to orogeny, late/post orogenic extension and the formation of a new passive margin in the Mesozoic and Tertiary.
		The recognition of complex strain patterns in orogens and their relation to tectonothermal evolution of rocks during burial and exhumation presents a challenge to our understanding of orogenic processes.
		The transition from large-scale crustal thickening to crustal thinning at the end of the orogenic cycle presents a set of intriguing problems with respect to controlling factors as well as to consequences for later deformation events.
	www.geodynamics.no /THEMES/Passive_Margins/Text/Introduction.htm (487 words)

	KGS--Bulletin 169--Sloss
		Each significant pulse of orogenic activity in the mobile belt is marked by the spread of clastic wedges of externally derived material across much of the width of the marginal basin.
		In tectonic terms, the characteristic feature is the abrupt appearance of orogenic positive elements and complementary yoked basins; some are accelerations or exaggerations of the tectonic habits of pre-existing elements and some are new elements unheralded by earlier patterns of behavior.
		From time to time during the span of the orogenic model, there is, at least locally, a cessation of violent uplift and downwarp, and the yoked basins take on the tectonic habit and sedimentary responses of normal interior basins.
	www.kgs.ku.edu /Publications/Bulletins/169/Sloss (5421 words)

	Orogenic Belts
		Our group has taken a "holistic view" in the study of orogenic belts, where we are interested in the complete view of orogenic systems, from prograde metamorphism and subduction to ultra-high-pressures (UHP) to magma genesis and the timescales of volcanic evolution.
		Despite over a century of structural studies and decades of geochronological research in this region, the age and duration of HP to UHP metamorphism, the maximum pressures and temperatures the Zermatt-Saas ophiolite and structurally underlying basement nappes experienced, and the rate at which these units were buried and exhumed remain unresolved problems.
		We have focused on the Alps because this orogenic belt is young enough so that temporal relations may be worked out in detail, the exposures are superb, the maximum temperatures were relatively cool, below the blocking temperatures of several geochronometers, and the prior geologic work provides a excellent framework upon which to build new studies.
	www.geology.wisc.edu /~unstable/Orogenic_Belts/Orogenic_Belts.htm (1967 words)

	RESEARCH WITHIN THE ANTLER OROGENIC REGION
		The first geology field camp mapping project in the Antler orogen was restricted to several square miles in the Galena and Iron Canyon drainage system on the west side of Battle Mountain and took place during the spring of 1985 and 1986.
		The Antler Orogeny was named by Ralph J. Roberts in 1949 (Roberts, 2002) from exposures at Antler Peak, Battle Mountain, Nevada and the tenets are largely a construct of USGS geologists mapping in central Nevada.
		The Antler Orogenic belt consists of a structural complex of lower Paleozoic continental-margin, slope and rise sedimentary and volcanic rocks which were transported, deformed, uplifted, eroded, and overlapped by upper Paleozoic orogenic shed and shallow water carbonates and clastics.
	www.geology.ewu.edu /mccollum/ANTLEROROGENICREGION.htm (5755 words)

	Orogenic Displacement of Proteins (Site not responding. Last check: 2007-10-15)
		Initially, as the protein network is compressed individual proteins refold, then the network folds and buckles, and finally the network snaps.
		The orogenic displacement of protein from the air/water interface by competitive adsorption.
		Orogenic displacement in mixed Β-lactoglobulin /Β-casein films at the air/water interface.
	www.ifrn.bbsrc.ac.uk /spm/Proteins.html (613 words)

	Orogenic tectonism on Io
		We propose instead that orogenic faults may act as conduits for magma ascent, thus fueling patera formation near mountains.
		As resurfacing buries a shell of material from Io's surface to the base of the lithosphere, its effective radius is reduced and it heats up.
		We hypothesize that, in some cases, mountain formation may be facilitated by asthenospheric diapirs impinging on the base of the lithosphere.
	www.agu.org /pubs/crossref/2003/2002JE001946.shtml (385 words)

	Orogenic Gold Deposits. Rich Goldfarb. (Site not responding. Last check: 2007-10-15)
		Patterns subsequent to 1.7 Ga reflect the decreasing influence of such plume activity on plate tectonics and the increasing impact of modern-style plate tectonics on crustal evolution and ore deposition.
		Rich's main research interests include global gold metallogeny with an emphasis on the temporal/spatial distribution of deposits, the geology of ore deposits in the North American Cordillera with emphasis on orogenic gold and collisional tectonics, and fluid inclusion/stable isotope applications to the understanding of ore genesis.
		Rich is also chief editor of Mineralium Deposita*, adjunct professor in economic geology at the University of Colorado, and active collaborator at the Centre for Teaching and Research in Strategic Mineral deposits at UWA.
	www.smedg.org.au /oct99.html (284 words)

	Geologic Structures
		Orogenic deformation is folding, faulting and metamorphism related to the collisional events that that create orogenic belts.
		Orogenic deformation is restricted to the mobile belts of continents.
		The current and recent orogenic history of a continent controls the regional slope of major drainage systems.
	w3.salemstate.edu /~lhanson/gls210/gls210_struct.htm (2040 words)

	Prediction of orogenic gold deposition in the Western Alps by Geodynamic Modeling
		Exploration for orogenic gold deposits requires predictive understanding of how large-scale tectonism controls the generation and flow of hydrothermal fluids.
		We use a thermo-mechanical numerical model to explore the role of Alpine continental collision in forming gold-quartz veins in the Western Alps.
		The channels are inferred to permit gold-bearing metamorphic fluids to ascend from the middle crust into shallow brittle-ductile structures, where ore precipitates.
	www.gns.cri.nz /research/geodynamics/alps.html (253 words)

	Terrane - Wikipedia, the free encyclopedia
		It followed that the present orogenic belt was itself an accretionary collage, composed of numerous terranes derived from around the circum-Pacific region and now ‘welded’ together along major faults.
		These concepts were soon applied to other, older orogenic belts, e.g.
		Support for the new hypothesis came not only from structural and lithological studies, but also from studies of faunal biodiversity and palaeomagnetism.
	en.wikipedia.org /wiki/Terrane (253 words)

	COLLISIONAL MODEL FOR A GRENVILLE-AGED OROGENIC BELT: LLANO UPLIFT, CENTRAL TEXAS (Site not responding. Last check: 2007-10-15)
		The Llano uplift of central Texas exposes the core of a collisional orogenic belt that formed along the southern margin of Laurentia during Grenville time.
		A collisional model is proposed that reconciles differences in structural stacking, apparent tectonic transport, and deformation conditions between the eastern and western portions of the uplift.
		Polyphase deformation intimately associated with partial melting, lack of discrete shear zones, and uppermost amphibolite facies conditions postdating the eclogitic transitional to granulite facies conditions are compatible with this orogenic history.
	gsa.confex.com /gsa/2005SC/finalprogram/abstract_83993.htm (443 words)

	Orogenic Exploration Pty Ltd (Site not responding. Last check: 2007-10-15)
		Orogenic Exploration Pty Ltd is a private diamond exploration company based in Melbourne, Australia.
		Orogenic also specialises in providing to others, advanced exploration strategies and consulting in relation to the development of diamond projects.
		It currently has three diamond exploration projects active on the Gawler Craton in the state of South Australia.
	www.orogenic.com.au (67 words)

	Rates of shortening, propagation, underthrusting, and flexural wave migration in continental orogenic systems -- ... (Site not responding. Last check: 2007-10-15)
		The rate of horizontal shortening in an orogenic wedge is the
		of an orogenic wedge is the rate at which it elongates in the
		by the rates of mass accretion to the orogenic wedge and erosion.
	geology.geoscienceworld.org /cgi/content/abstract/29/2/135 (343 words)

	USC Seismology - Orogenic Systems (Site not responding. Last check: 2007-10-15)
		We have undertaken to strengthen our existing expertise in the the broad area which we call the "Evolution of Orogenic Systems".
		This area includes many "traditional subdisciplines" in the Geosciences related to deciphering the physical and chemical processes that have controlled the tectonic processes and internal structure of the earth.
		We have resolved to expand our historical strengths in regional tectonics, seismology, lithospheric processes, applied geophysics, satellite geodesy, igneous petrology, structural geology, petroleum exploration, and sequence stratigraphy into emerging new areas of study to create the environment needed to adequately study the inherrently multidisciplinary problems of orogenic processes.
	www.seis.sc.edu /oro_sys.html (126 words)

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