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Topic: Intrusion (geology)

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	Geology - Continental Drift - Crystalinks
		Geology is the scientific study of the Earth, including its composition, structure, physical properties, and history.
		The term geology is broadly inclusive and is often regarded as embracing all of the geologic sciences.
		Geology is the science and study of the solid matter of a celestial body, its composition, structure, physical properties, history and the processes that shape it.
	www.crystalinks.com /geology.html (2119 words)

	DESCRIPTION OF THE BJERKREIM - SOKNDAL INTRUSION
		In the axial region of the intrusion and on the southern flank, zone a is overlain by leucotroctolite (zone b) that contains cumulus magnetite in addition to plagioclase, olivine and ilmenite.
		In the eastern flank of the intrusion MCU III is relatively condensed and zone b is absent.
		Ilmenite and plagioclase-ilmenite cumulates are prominent in zone IVa in the axial region of the intrusion, and ilmenite-rich melanorites are found at the base of MCU III to the east of Teksevatnet.
	www.uib.no /People/ngebr/BKSKDESCRIPTION.htm (6267 words)

	Intrusion (geology) - Hutchinson encyclopedia article about Intrusion (geology) (Site not responding. Last check: 2007-10-21)
		Sills are intrusions that flow between rock layers.
		Mass of igneous rock that has formed by ‘injection’ of molten rock, or magma, into existing cracks beneath the surface of the Earth, as distinct from a volcanic rock mass which has erupted from the surface.
		Intrusion features include vertical cylindrical structures such as stocks, pipes, and necks; sheet structures such as dykes that cut across the strata and sills that push between them; laccoliths, which are blisters that push up the overlying rock; and batholiths, which represent chambers of solidified magma and contain vast volumes of rock.
	encyclopedia.farlex.com /Intrusion+(geology) (189 words)

	Hydrogeology - Saline Intrusion (Site not responding. Last check: 2007-10-21)
		Such models can be used to simulate the progress of the intrusion and, in a predictive mode, they may be used to identify sustainable abstraction regimes.
		Saline intrusion into the coastal aquifer of Kerala is a serious and increasing problem in this relatively densely-populated rural area with many wells used for irrigation and domestic supply.
		A saline intrusion computer model was then developed with the aim of understanding the seasonal cyclic movement of the saline/freshwater interface and providing recommendations for safe abstraction.
	www.bgs.ac.uk /hydrogeology/Saline.htm (585 words)

	Intrusion - Wikipedia, the free encyclopedia
		In geology, an intrusion is a body of igneous rock that has crystallized from a molten magma below the surface of the Earth.
		A well-known example of an igneous intrusion is Devil's Tower in Wyoming, USA.
		Intrusive structures are often classified according to whether or not they are parallel to the bedding planes or foliation of the country rock: if the intrusion is parallel, the body is concordant, while if it cuts across the country rock, it is discordant.
	en.wikipedia.org /wiki/Intrusion_(geology) (389 words)

	Glossary (Site not responding. Last check: 2007-10-21)
		In geology, a mineral is a specific, naturally ocurring, crystalline substance.
		A sill is a relatively thin and wide (tabular, like a table top) "concordant" magmatic intrusion; sills intrude between or along (paralell to) local sediment and rock layers.
		In geology, weathering is the breakdown of rock into smaller pieces, or into different substances, by mechanical and chemical processes.
	home.comcast.net /~bollesg/geology/glossary.html (909 words)

	Devils Tower National Monument - Geology
		Geologists agree that Devils Tower was formed by the intrusion (the forcible entry of molten rock into or between other rock formations) of igneous material.
		Geologists Carpenter and Russell studied Devils Tower in the late 1800s and came to the conclusion that the Tower was indeed formed by an igneous intrusion.
		In any case, geologists agree, the igneous material intruded and then cooled as phonolite porphyry, a light to dark-gray or greenish-gray igneous rock with conspicuous crystals of white feldspar.
	www.nps.gov /deto/geology.htm (945 words)

	Geology - Wikipedia, the free encyclopedia
		Planetary geology (sometimes known as Astrogeology) refers to the application of geologic principles to other bodies of the solar system.
		A fundamental principle of geology advanced by the 18th century Scottish physician and geologist James Hutton, is that "the present is the key to the past." In Hutton's words: "the past history of our globe must be explained by what can be seen to be happening now."
		An illustrated depiction of a syncline and anticline commonly studied in Structural geology and Geomorphology.
	en.wikipedia.org /wiki/Geology (1602 words)

	[No title]
		Because the science behind vapor intrusion is rapidly evolving and the preferred technical approaches for addressing the issue vary considerably from state to state, owners and operators of contaminated sites are finding themselves subject to costly delays and uncertainty as they try to satisfy the ever-changing regulatory requirements.
		Vapor intrusion began to attract some attention with the introduction of “risk-based corrective action” ("RBCA") where cleanup levels are based on the actual as opposed to theoretical risks posed by contaminants.
		To develop a vapor intrusion problem, there must be a source of contamination and a pathway for entry of the contaminants into a building.
	www.environmental-law.net /article/documents/VaporIntrusionBasics.doc (3316 words)

	Rib Mountain, Wausau, Wisconsin, Geology
		Despite the size of these intrusions, we are not certain of what was happening in the subsurface to melt material there and form the magmas.
		The geology map of the area shows that the quartzite hills are arranged in a rough semi-circle within the crescent of the syenite pluton.
		The answer is, in the 1.5 billion years since its intrusion, erosion in the landscape by rivers and other agents, such as glacial ice, has worn away the rocks that the syenite intruded.
	www.uwmc.uwc.edu /geography/ribmtn/ribmtn.htm (2675 words)

	THREE-DIMENSIONAL MAGMATIC FABRIC OF A SHEETED LACCOLITH, HENRY MOUNTAINS, UTAH (Site not responding. Last check: 2007-10-21)
		The intrusion is located on the eastern flank of Mt Hillers, one of the five intrusive centers in the Henry Mountains.
		Contacts between the intrusion and the surrounding sediments are well exposed on steep cliffs and in several canyons.
		The fabric of this intrusion was determined using field measurements of aligned elongate minerals and laboratory determination of anisotropy of magnetic susceptibility (AMS).
	gsa.confex.com /gsa/2002AM/finalprogram/abstract_37104.htm (396 words)

	Intrusion (geology) biography .ms (Site not responding. Last check: 2007-10-21)
		A geologic intrusion is usually a body of igneous rock that has crystallized from a molten magma below the surface of the Earth.
		Diapir is the more general term for intrusions that includes both igneous and non-igneous structures, such as salt domes.
		Igneous intrusions themselves are typically too hot to allow the preservation of preexisting hydrocarbons.
	pluton.biography.ms (291 words)

	MI DEQ GSD - General Information - General Geology of Michigan
		Michigan is unique among the states in that it is divided into two areas geographically, the Northern and Southern Peninsulas, and in that, to a considerable degree, these two geographical provinces are geologically separate and distinct.
		In addition to this broad split, Michigan geology also is characterized by a major horizontal break-bedrock geology vs. surficial geology.
		In many cases these crustal crumplings were accompanied by the intrusion of molten masses of granitoid igneous rocks emplaced deep within the crust and subsequently unveiled by uplift and erosion.
	www.calvin.edu /academic/geology/prospect/michgeol.htm (1613 words)

	UAF Geology and Geophysics-Economic Geology and Geochemistry
		The main thrust of the Graduate Program in Economic Geology at UAF is the MS degree, designed to give students a practical working knowledge of the basic tools of economic geology, including mapping and core logging, as well as experience in the use of research tools to test hypotheses.
		MS students are encouraged to and assisted in acquiring a thesis project which involves working at least one summer in the field with industry or government geologists involved in exploration, mining, and/or mapping.
		UAF faculty who commonly serve on Economic Geology theses include UAF faculty with expertise in geochronology; microbeam analytical techniques; igneous, metamorphic, and sedimentary petrology; and structural geology.
	www.uaf.edu /geology/Research/research/economic.html (307 words)

	Water Supply Bulletins (Site not responding. Last check: 2007-10-21)
		Water Supply Bulletin 17 (1962) presents a discussion of the geology and an evaluation of the water-bearing characteristics for each important aquifer within Lewis County, WA.
		Water Supply Bulletin 21 (1965) describes an investigation of the size and extent of the water-bearing geologic units, their probable recharge and discharge areas, and the general groundwater flow regime for the purposes of assisting water resource planning in the Walla Walla River basin.
		Water Supply Bulletin 56 (1984) describes an investigation of the extent, severity, and long-term trends of seawater intrusion in 14 counties of coastal Washington, by comparing chloride data collected in 1978 to chloride concentrations 1966-1968 and in 1978.
	www.ecy.wa.gov /programs/eap/wsb/wsb_Geology-and-Groundwater.html (2201 words)

	University of Wisconsin-Eau Claire: Geology
		As well as adding to our understanding of the evolution of mafic intrusions, this interdisciplinary approach may shed light on the formation and location of economic ore deposits commonly associated with these types of intrusions.
		Internal structure and emplacement history of the Sonju Lake Intrusion, northeast Minnesota, inferred from magnetic fabrics.
		Geology • Phillips 157 • University of Wisconsin-Eau Claire • Eau Claire, WI 54702-4004
	www.uwec.edu /Geology/meetTheFaculty/maes.htm (434 words)

	RegionalGeo.html (Site not responding. Last check: 2007-10-21)
		These early intrusions were accompanied by volcanic flows (lower North Shore Volcanic Group; reversed magnetic polarity) that are primarily mafic, but range from basalt to rhyolite.
		During the main magmatic stage numerous intrusions, consisting of layered gabbroic rocks, anorthosite, or felsic granophyre, were emplaced along the base of (Duluth Complex), or within (Beaver Bay Complex) the thickening volcanic pile.
		The Sonju Lake Intrusion and associated Finland granophyre are part of the Beaver Bay complex that was intruded at a relatively shallow level within the volcanic sequence during the main magmatic stage.
	www.macalester.edu /geology/sonju/RegionalGeol.html (363 words)

	Events (Site not responding. Last check: 2007-10-21)
		The vapor intrusion (VI) pathway is an emerging concern that may impact thousands of hazardous, brownfield, and commercial/industrial waste sites across the nation, as well as residential and other buildings near the sites.
		Vapor intrusion (VI) is a potential issue for any company that has sites with subsurface organic contamination and the VI exposure pathway has received a great deal of attention from regulators in recent years.
		Vapor intrusion, however, cuts across so many technical areas - from the subsurface transport of LNAPL to building ventilation design to toxicology - that it is a very difficult issue to master, even for environmental professionals used to working with multimedia, multidisciplinary problems.
	www.awma.org /events/confs/vaporintrusion/default1.asp (439 words)

	Geology Department and Courses (Site not responding. Last check: 2007-10-21)
		The Department of Geology seeks to teach and model for a student how data on earth processes and structures are understood and evaluated within interpretive frameworks, especially in relation to understanding earth history.
		Students earn the master of science degree in geology by specializing in one of three areas: (1) soft-rock geology, (2) hard-rock geology, or (3) solid-earth geophysics.
		The ore deposits studied will include those associated with layered igneous intrusions, massive sulfides associated with volcanic rocks, porphyry copper (±gold±molybdenum) deposits associated with granitic intrusions, massive sulphide deposits within sedimentary rock units, banded iron formations, massive iron oxide-breccia copper (plus other metals) deposits, and vein and hydrothermal deposits of different metals and types.
	www.icr.edu /geology/index.html (1210 words)

	Igneous Intrusive Bodies
		At times these features, known as igneous intrusions, can be viewed at the earth’s surface, giving geologists the opportunity to study the process of how igneous rocks form and interact with pre-existing rock.
		The size and shape of these intrusions is dependent on a few factors.
		The dike is probably one of the most abundant of the igneous intrusions.
	www.suite101.com /article.cfm/everyday_geology/82369 (473 words)

	Washington DGER: Geology of Washington
		To the east, the Rocky Mountains influence the geology of Idaho.
		The area of the state has been subject to continental collisions, metamorphism, intrusion of igneous rocks, volcanism, mountain-building episodes, erosion, and massive flooding events.
		The easiest way to understand Washington's complex geology is to examine each physiographic region individually.
	www.dnr.wa.gov /geology/geolofwa.htm (243 words)

	Igneous Intrusive Bodies
		How these three types form are affected by the geology of the rocks the intrusion is moving into and all three are generally concordant.
		Laccoliths are igneous intrusions that generally form a mushroom-shape.
		Their shape is a reflection of the composition of the igneous rock being intruded, and the geology of the country rock.
	www.suite101.com /article.cfm/everyday_geology/82369/2 (440 words)

	Igneous Intrusions - Search Results - MSN Encarta
		Igneous Intrusions, masses of rock which have been consolidated by crystallizing out of molten material (known as magma) at some depth within the...
		Such mountains are created by deep-seated intrusion of igneous, or molten, rock...
		Dyke (geology), in geology, wall-like intrusion of igneous rock, cutting across other strata of pre-existing rocks, originally formed by a flow of...
	uk.encarta.msn.com /Igneous_Intrusions.html (101 words)

	University of Wisconsin Eau Claire: Geology Department
		The NDMIC represents an ideal microcosm of the batholith for petrogenetic and structural studies because it exposes both mafic and felsic units and was emplaced in the limb of a major thrust related fold.
		Three distinct lithologies portray a stratigraphic relationship consistent with progressive crystal fractionation in the form of 1) basal, olivine and pyroxene cumulate; 2) intermediate horizon of diorite to monzodiorite; 3) ceiling capped by thin veneer of felsic granodiorite.
		This is striking, given the extreme eastern location of these magmas relative to the active arc at the time of their intrusion.
	www.uwec.edu /Geology/poster/2003.htm (1638 words)

	Saltwater Intrusion in Los Angeles Area Coastal Aquifers--the Marine Connection \| FS 030-02
		Saltwater intrusion in coastal aquifers of Los Angeles County is a result of increasing use of ground-water resources accompanying population growth.
		To investigate the marine connection to saltwater intrusion in coastal areas of Greater Los Angeles, scientists are using a variety of techniques to study the geology offshore.
		The efforts of the USGS and its cooperators in studying saltwater intrusion in coastal areas of the Los Angeles Basin are leading to a better understanding of how the ground-water supplies crucial to populous coastal regions can be managed and sustained.
	pubs.usgs.gov /fs/2002/fs030-02 (1176 words)

	Formation of the Jinchuan ultramafic intrusion and the world's third largest Ni-Cu sulfide deposit: Associated with the ...
		This age is indistinguishable within analytical uncertainties from the U-Pb zircon ages of 827 ± 8 Ma and 828 ± 3 Ma for the sulfide-bearing ultramafic rocks and the dolerite dykes that cut the ultramafic intrusion, respectively.
		Mineralogical, petrological, and geochemical data all indicate that the Jinchuan intrusion was generated by melting of the enriched lithospheric mantle heated by an anomalously hot plume.
		The Jinchuan Ni-Cu sulfide-bearing intrusion, along with coeval regional plume-related mafic dykes and tholeiites, and mafic-ultramafic complexes with associated V-Ti and Ni-Cu-PGE mineralization, is interpreted to be genetically related to the ∼825 Ma south China mantle plume.
	www.agu.org /pubs/crossref/2005/2005GC001006.shtml (513 words)

	Richard S. James - Department of Earth Sciences, Laurentian University
		Igneous stratigraphy, petrology and PGE mineralization in the River Valley Intrusion, central Ontario; in collaboration with M. Easton, O.G.S. and J. Hrominchuk, M.Sc.
		Geology, petrology and PGE-Ni mineralization of the neoarchean Entwine Lake intrusion, an intermediate to mafic igneous intrusion.
		Geology and metamorphic history of the Timmins Creek Area, Grenville Front Tectonic Zone, Sudbury, Ontario.
	www.laurentian.ca /geology/faculty/james.html (740 words)

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