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Topic: Dike geology

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	Dike (geology) - Wikipedia, the free encyclopedia
		Dikes are usually high angle to near vertical in orientation, but subsequent tectonic deformation may rotate the including sequence.
		Dikes often form as either radial or concentric swarms around plutonic intrusives or around volcanic necks or feeder vents in volcanic cones.
		Pegmatite dikes are extremely coarsely crystalline granitic rocks often associated with late stage granite intrusions or metamorphic segregations.
	en.wikipedia.org /wiki/Dike_(geology) (219 words)

	GSA Cordilleran Section Field Trip Guidebook: Independence Dike Swarm
		Dikes correlated with the IDS occur north of the Mt. Morrison quadrangle in the Snow Lake pendant of the central Sierra Nevada, but these dikes likely formed much farther to the south and were translated by Cretaceous dextral faulting to their present location (Lahren et al., 1990; Schweickert and Lahren, 1990).
		Dikes here are shallow-level examples of Independence dikes and resemble dikes exposed in the Ord and Rodman Mountains to the north and west (Dibblee 1964a, 1964b) that cut nearly coeval volcanic rocks of the Upper Sidewinder series (e.g., Schermer and Busby, 1994).
		Dikes in this area mainly strike 320° and are interpreted to have formed during extension orthogonal to the swarm (Karish et al., 1987; Schermer, 1993), based on the observation that the dikes both were injected along and are cut by normal faults in the Upper Sidewinder volcanic series.
	www.geolab.unc.edu /Petunia/IDS_Web_Site/FTG.html (8405 words)

	Dike (geology) -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-08-19)
		Dikes are usually high angle to near vertical in orientation, but subsequent (Click link for more info and facts about tectonic) tectonic deformation may rotate the including sequence.
		Dikes often form as either radial or concentric swarms around plutonic intrusives or around (Click link for more info and facts about volcanic) volcanic necks or feeder vents in volcanic cones.
		Dikes can vary in texture and composition from (Click link for more info and facts about diabase) diabase or (Click link for more info and facts about basaltic) basaltic to (Click link for more info and facts about granitic) granitic or (Click link for more info and facts about rhyolitic) rhyolitic.
	www.absoluteastronomy.com /encyclopedia/D/Di/Dike_(geology).htm (371 words)

	Talk: Feldspar - Open Encyclopedia (Site not responding. Last check: 2007-08-19)
		I believe in the context of geology a "dike" is a place where rock type has intruded into another rock type, often as magma seeping into cracks in older rock and hardening.
		So a pegmatite dike would be an intrusion of pegmatite into some other type of rock.
		Dike (geology) --Vsmith 03:16, 11 Sep 2004 (UTC)
	talk.open-encyclopedia.com /Feldspar (169 words)

	Dike (Site not responding. Last check: 2007-08-19)
		A dike (in American English) or dyke (in British English) is:
		Dike is also the Greek goddess of moral justice, see Dike (goddess) See also dyke for other meanings under that spelling.
		Petersburg Times: Welcome to Dike Okeechobee Julie Hauserman reports on the history and current conditions of the dike, plans of the US Army Corp of Engineers, and the community response.
	www.serebella.com /encyclopedia/article-Dike.html (296 words)

	March media highlights: Geology and GSA Today
		Following are highlights from the March issue of GEOLOGY and a summary of the science article from the March issue of GSA TODAY, published by the Geological Society of America.
		Dikes would obviously compromise the stability of a burial site, and so the goal would be to bury radioactive waste where dikes would not form.
		They analyzed dikes in terms of their proximity to volcanos, and determined that the mineralogy of the dike, as well as position relative to the volcano, exerts a considerable and predictable (quantifiable) influence on the probability of a dike intersecting a potential burial site.
	www.eurekalert.org /pub_releases/2001-02/GSoA-MmhG-2202101.php (1191 words)

	Travels with Geology - Grand Teton National Park
		The best exposure of these dikes is on the eastern face of Mt. Moran where the "Black Dike" extends from the summit of the peak downward to Leigh Lake on the floor of the valley.
		The flat top of Mt. Moran coincides with this surface of erosion between the Precambrian and younger rocks, and on the summit, a small remnant of the oldest Paleozoic rocks (the Flathead sandstone) is preserved as a light-brown-colored outcrop on the southern half of the peak.
		The fl dike, which traverses the summit of Mt. Moran, does not cut across this sandstone, indicating that the sandstone is younger in age than the dike.
	www.winona.edu /geology/travels/tetons/travel.html (1871 words)

	Dyke - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-08-19)
		A dyke / dike is a long wall built to keep out the sea or enclose land or generally to enclose or separate land (cf.
		Dyke / Dike is another word for a ditch, especially a drainage ditch.
		Dyke is a slang term for a lesbian, and has the same spelling worldwide.
	www.butte-silverbow.us /project/wikipedia/index.php/Dikes (232 words)

	Dike (geology) (Site not responding. Last check: 2007-08-19)
		Mike Horne's Geology Notes on geology from Hull University classes and links to further information about the Speeton Clay, Yorkshire Chalk and geology of Holderness.
		Touring Colorado Geology An exploration of the geology of Colorado through mini-fieldtrips.
		Nevada Bureau of Mines and Geology Conducts research and publishes reports on mineral resources, engineering geology, environmental geology, hydrogeology, and geologic mapping.
	www.serebella.com /encyclopedia/article-Dike_(geology).html (330 words)

	EMPLACEMENT MECHANISM OF A MESOZOIC CAMPTONITE DIKE, WINOOSKI, VERMONT (Site not responding. Last check: 2007-08-19)
		Dikes represent magma conduits that develop either along preexisting structural weaknesses in rocks or along an echelon fracture array that is produced during magma emplacement by a hydrofracture-type mechanism.
		The dike was emplaced in the Cambrian Winooski Dolostone which consists of thin beds (15 cm average) that strike N18E and dip 9SE.
		The presence of horns, bridges, and dike-parallel joints suggests that this dike was emplaced within an echelon fracture array that was created during emplacement by a hydrofracture-type mechanism.
	gsa.confex.com /gsa/2001NE/finalprogram/abstract_2646.htm (384 words)

	Dyke - Wikipedia, the free encyclopedia
		Dyke/dike (construction), a long wall built to keep out the sea or enclose land or generally to enclose or separate land
		Dyke/dike (geology), a long mass of minerals, usually an intrusion of igneous rocks, filling up rents or fissures in the original strata
		Dike (goddess), the Greek goddess of moral justice
	en.wikipedia.org /wiki/Dike (211 words)

	CT DEP: Geology of Osbornedale State Park
		This transition of rock types is due to a dike, which is a sheetlike body of igneous rock that cuts across layering or contacts in the rock into which it intrudes.
		The dikes located in Osbornedale State Park are all feeder dikes, which help supply the large lava flows in the Hartford Basin 200 million years ago.
		This particular dike is composed of diabase, a fine-grained igneous rock that cooled rapidly near the earth's surface.
	dep.state.ct.us /stateparks/geology/osbornegeo.htm (923 words)

	Dike (geology) - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-08-19)
		U-Pb geochronology and geologic significance of the two oldest known mafic dyke swarms on earth: 3659.
		Influence of faults on ascent of mafic magma by dike intrusion
		Paleomagnetism of a Late Cambrian or Early Ordovician dike from Lodore Canyon, northwestern Colorado (Open-file report / United States Department of the Interior, Geological Survey)
	encyclopedia.worldsearch.com /dike_(geology).htm (306 words)

	Pismo Beach, CA - Beach Geology Walk, Self Guided (Site not responding. Last check: 2007-08-19)
		The dike (#5) is a tabular igneous rock formation that "cuts across the grain" of the host rock body created when a magma (liquid rock) injects itself at depth into a crack or other plane of weakness in that host rock (in this case, the tuff).
		Dikes are often thought of as vertical and sills as horizontal, although that's technically not necessarily true.
		Then lastly, the fault "cut" the tuffs and the dike, causing the dike to be offset and bringing the yellow tuff in contact with the white tuff.
	www.jf2.com /geowalk/geowalk.html (2058 words)

	Dike - Definition of Dike by Webster's Online Dictionary (Site not responding. Last check: 2007-08-19)
		Dikes that the hands of the farmers had raised.
		dike - enclose with a dike; "dike the land to protect it from water"
		To "dike something out" means to use such cutters to remove something.
	www.webster-dictionary.org /definition/Dike (255 words)

	Volcano - Wikipedia, the free encyclopedia
		For example, Mount St. Helens is found inland from the margin between the oceanic Juan de Fuca Plate and the continental North American Plate.
		When the cone is eroded these rifts or lava filled fractures remain as radial near vertical dikes of volcanic rock.
		For example the radiating dikes at Shiprock in NW New Mexico.
	en.wikipedia.org /wiki/Volcano (3601 words)

	ring dike
		A subcircular to circular dike with steep dip.
		Ring dikes may be many kilometers long, and hundreds or thousands of meters thick.
		Ring dikes are commonly associated with cone sheets to form a ring complex.
	www.webref.org /geology/r/ring_dike.htm (163 words)

	WINTSCH (Site not responding. Last check: 2007-08-19)
		Most of the dikes occur in the crystalline rocks surrounding the basins where their exposures provide samples of the magma that existed at some considerable depth in the crust and which may differ significantly from that of the associated lava.
		In correlating dikes with lavas it is important, therefore, to consider what processes might cause differences between the magma at depth and on the surface.
		Compositional differences between lava and feeder dike must consequently be due to changes in the composition of the magma rising from the source region or to processes acting during the solidification of the rocks.
	www.ldeo.columbia.edu /users/polsen/nbcp/philpotts.html (613 words)

	Read about Dike (geology) at WorldVillage Encyclopedia. Research Dike (geology) and learn about Dike (geology) here! (Site not responding. Last check: 2007-08-19)
		Dikes often form as either radial or concentric swarms around plutonic intrusives or around
		Dikes can vary in texture and composition from diabase or
		Pegmatite dikes are extremely coarsely crystalline granitic rocks often associated with late stage granite intrusions or
	encyclopedia.worldvillage.com /s/b/Dike_%28geology%29 (211 words)

	Dike - Hutchinson encyclopedia article about Dike (Site not responding. Last check: 2007-08-19)
		About halfway across the heath there had been a wide dike recently cut, and the earth from the cutting was cast up roughly on the other side.
		I remember the remains of one upon an island in a small lake near Lerwick, which at high tide communicates with the sea, the access to which is very ingenious, by means of a causeway or dike, about three or four inches under the surface of the water.
		The first fragment of their earthly possessions is a low natural dike of shingle, surmounted by a public path which runs parallel with the sea.
	encyclopedia.farlex.com /dike (198 words)

	Adirondack Mountain Geology
		Igneous rocks called diabase dikes (Figure 4.21) show that molten rock was injected and hardened in narrow vertical zones, often along faults.
		The dike in (A) is made of pegmatite, a very coarse-grained igneous rock, cutting across olivine metagabbro.
		The dike in (B) is the igneous rock diabase cutting across marble.
	gretchen.geo.rpi.edu /roecker/nys/adir_txt.html (6065 words)

	Science Fair Projects - Dolerite
		As may be inferred from their highly crystalline state they are very often intrusive, and occur as dikes and sills, but many of them form lava flows.
		Transitions to the porphyritic dolerites and basalts arise by increase in the proportion of this ground-mass.
		The edges of dolerite sills and dikes often contain, much dark brown glass, and pass into tachylytes, in which this material preponderates.
	www.all-science-fair-projects.com /science_fair_projects_encyclopedia/Dolerite (768 words)

	dike (Site not responding. Last check: 2007-08-19)
		A magma conduit that may have fed a vent on the surface (not all dikes reach the surface).
		In some volcanoes, the dikes radiate out from the central vent, reflecting homogeneous inflation of the volcano as it was filled with magma.
		Often the magma that slowly cools in the dikes forms more resistant rock (as compared to the broken up lavas or pyroclastic rocks of the flanks of the volcano), and dikes in old eroded volcanoes often form prominent ridges.
	www.geology.wisc.edu /~g111/Terms/dike/dike.htm (99 words)

	Pranoti Asher
		in Geology from the University of Bombay, India and a Ph.D. in the Geological sciences from the Department of Geology and Geophysics at the University of Connecticut, Storrs.
		At Georgia Southern, she is involved in teaching Introduction to Earth (formerly known as Physical Geology), Mineralogy, Petrology, Volcanology, and Regional Field Geology.
		From 1992-93 she was hired by the Department of Geology at Colby College in Waterville, Maine as a Laboratory Instructor for Physical and Historical Geology.
	cost.georgiasouthern.edu /cturtle/asher.html (1420 words)

	Dike (geology) (Site not responding. Last check: 2007-08-19)
		A dike in geology refers to a tabular Intrusion (geology) igneous body.
		Near horizontal or conformable intrusions along bedding planes between strata are called intrusive Sill (geology)s.
		Dikes often form as either radial or concentric swarms around plutonic intrusives or around volcano necks or feeder vents in volcanic cones.
	read-and-go.hopto.org /Volcanology/Dike-(geology).html (168 words)

	Geology of the Canadian Sites
		The surface geology is shown in Figure 2 [Photos of the vein-dike in Figures 2a,b].
		The surface geology of the mine is shown on Figure 3.
		The geology of the Silver Crater Mine site is similar to the geology of the Fission site, and the calcite vein-dike is part of the same group of calcite vein-dikes that dot the countryside near Bancroft.
	www.csun.edu /~vcgeo005/gentry/canada.htm (3274 words)

	Geology (Site not responding. Last check: 2007-08-19)
		A Cambrian age clastic sandstone dike (Sawatch Sandstone) is on the left.
		This clastic dike represents pulverized parts of an OVERLYING sedimentary rock unit, in this case the Sawatch Sandstone.
		Clastic dikes are odd features, very resistant to erosion, and somewhat rare at the size seen near Woodland Park (Wobus, 1999).
	www.thebrandts.org /htmOddsEnds/Geology.htm (2376 words)

	Dike (goddess) - Hutchinson encyclopedia article about Dike (goddess)
		In Greek mythology, the goddesses of the seasons, two to four in number.
		Later Hesiod named them as Dike (justice), Eunomia (good order), and Irene (peace); daughters of Zeus and Themis, the personification of order, and guardians of the processes of agriculture.
		Classical Athens recognized two Horae: Thallo, goddess of flowers and spring, and Carpo, goddess of the fruits of summer; their festival was the Horaea.
	encyclopedia.farlex.com /Dike+(goddess) (187 words)

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