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Topic: Diabase

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	Diabase - Wikipedia, the free encyclopedia
		Diabase is a mafic, holocrystalline, igneous rock equivalent to volcanic basalt or plutonic gabbro.
		Diabase normally has a fine, but visible texture of euhedral lath shaped plagioclase crystals set in a finer matrix of pyroxene, typically augite, with minor olivine and magnetite.
		Diabase dikes occur in regions of crustal extension and often occur in dike swarms of hundreds of individual dikes or sills radiating from a single volcanic center.
	en.wikipedia.org /wiki/Diabase (207 words)

	DIABASE - LoveToKnow Article on DIABASE (Site not responding. Last check: 2007-11-06)
		Hornblende, mostly of pale green colors and somewhat fibrous habit, is very frequent in diabase; it is in most cases secondary after pyroxene, and is then known as uralite; often it forms pseudomorphs which retain the shape of the original augite.
		Chlorite also is abundant both in sheared and unsheared diabases, and with it calcite may make its appearance, or the lime set free from the augite may combine with the titanium of the iron oxide and with silica to form incrustations or borders of sphene around the original crystals of ilmenite.
		Diabases are exceedingly abundant among the older rocks of all parts of the globe.
	www.1911encyclopedia.org /D/DI/DIABASE.htm (681 words)

	CVO Menu - America's Volcanic Past - Pennsylvania
		Seminary Ridge is the trace of a diabase dike (Rossville Diabase) that apparently is an offshoot of the westward-dipping Gettysburg sill.
		The igneous rock, diabase, or "trap" as it is commonly known, is a dark-gray, medium crystalline rock composed predominantly of the two minerals labradorite (a gray feldspar) and augite (a fl pyroxene).
		Diabase is the most resistant of all the rock units and forms Haycock Mountain and the rocky hills in the northwestern portion of the park.
	vulcan.wr.usgs.gov /LivingWith/VolcanicPast/Places/volcanic_past_pennsylvania.html (4042 words)

	CVO Menu - America's Volcanic Past - New Jersey
		Diabase is a rock formed by the cooling of magma at some depth in the crust; basalt is formed by cooling of an identical magma that has been extruded onto the surface as lava.
		The Palisades are the eroded cross-section of a large intrusive diabase sill that intruded between layers of sandstone and shale of the Late Triassic Stockton and Lockatong Formations.
		An outcrop of diabase at the top of the cliffs is one of the first thing you see when you emerge onto the ramp from the Lincoln Tunnel on the New Jersey end.
	vulcan.wr.usgs.gov /LivingWith/VolcanicPast/Places/volcanic_past_new_jersey.html (3606 words)

	DISCUSSION (Site not responding. Last check: 2007-11-06)
		The presence of ubiquitous basalt, diabase, and gabbro with grain size increasing with depth suggests that the Moresby Seamount may be comprised, at least in part, of oceanic crust (Taylor, Huchon, Klaus, et al., 1999).
		It is tempting to correlate the basalt, diabase, and gabbro recovered during Leg 180 with rocks of the Papuan Ultramafic Belt (PUB) of southeast Papua New Guinea.
		Diabase and gabbro recovered during Leg 180 are petrologically and chemically similar between sites with respect to mineralogy, texture, and nonmobile major and trace elements but are heterogeneous with respect to degree of alteration and incorporation of "excess" or inherited
	www.ga.gov.au /odp/publications/180_SR/173/173_7.htm (1227 words)

	Probert Encyclopaedia: Rocks and Minerals (D) (Site not responding. Last check: 2007-11-06)
		Diabase is a dark, intrusive, basic igneous rock made up of plagioclase feldspar crystals, surrounded by smaller grains of pyroxenes, such as augite and up to ten percent quartz.
		Diabase is fomed from magna that has cooled just below the Earth's surface, and is sometimes found as intrusions in older rock.
		A comoon place to find diabase is in the neck of old volcanoes, where it has formed a plug.
	www.probertencyclopaedia.com /H4.HTM (862 words)

	UNFORBIDDEN GEOLOGY
		Diabase is a fine-grained intrusive igneous rock of a composition similar to basalt, but is slightly more coarse-grained than basalt.
		Diabase is associated with sill and dike intrusions in the hypabyssal (upper few km of the Earth's crust).
		The spherical diabase pounders observed in the quarries are similar to cobble to bolder sized naturally occurring sediments present in the cataract regions of the Nile and in the Eastern desert, presumable the result of erosion of diabase and rounding as the coarse sediments were transported down the Nile during floods.
	www.geocities.com /unforbidden_geology/diabase.html (500 words)

	McHone&Puffer SignificancePaper
		Because diabase dikes and sills are locally prominent in Triassic strata that underlie the basin basalts, stratigraphic and tectonic models have commonly assumed that the basaltic lavas originated from vents within each basin.
		Diabase dikes of the Mesozoic basins are also members of large dike swarms that are characterized by particular orientations and/or magma types, which are found across regions widely separated from the modern basins.
		Geology and geochemistry of Triassic diabase in Pennsylvania.
	www.auburn.edu /academic/science_math/res_area/geology/camp/McHone_Puffer.html (5991 words)

	Santa Maria Mineral Property
		The diabase intrusion underlies the west half of the property from a depth of 0 feet in the west and about 550 feet toward the center at a dip of 20 - 30 degrees.
		The diabase sill is not a flat plain but is gently undulating and this feature combined with the accidental level of erosion, has conspired to expose the diabase to various depths.
		Depth of the diabase intrusive is from 0 feet in the west of the group where it outcrops,down to about 1200 feet nearer the east boundary of Gillies Limit where it is in contact with Algoman age granite.
	www.goldandsilvermines.com /santamaria.htm (3088 words)

	25sudbur
		In the region of the Cutler granite at the western end of the northern Espanola wedge, the marked penetrative foliation in 'Nipissing' garnet-amphibolites are deformed by crenulations and folds related to the large scale folds cored by the Cutler granite.
		Sampling of Sudbury diabase dykes in the Tyson Lake region in 1972 (Church, 1992) showed that the Grenville metamorphism was recognisable in the growth of microscopic garnets in the chilled margins of dykes, which otherwise appeared unmetamorphosed and undeformed other than where they were cut by non-penetrative shear zones.
		The youngest rocks in the parautochthon are garnet granulite and amphibolite dike segments and boudins representing the remains of Sudbury diabase dikes.
	instruct.uwo.ca /earth-sci/200a-001/25sudbur.htm (6055 words)

	Prior Research
		That there were active groundwater convection regimes established around the intrusions is indicated by ubiquitous, though variable, alteration in the diabase itself, and is suggested by the existence of uranium orebodies associated with carbon-bearing host rocks immediately adjacent to some of the sills.
		On superficial inspection, these appeared to be chilled margins of the diabase, but careful examination and geochemical analysis established that this was not the case, and that the chilled nature of these selvages resulted from their being emplaced while the adjacent sill and country rock were relatively cool.
		The investigator wishing to obtain a comprehensive and accurate overview of the diabase, its host rocks, and their relations, is referred particularly to this work.
	jove.geol.niu.edu /faculty/dickey/prior.htm (1264 words)

	Pizzorusso: Leonardo's Geology (Site not responding. Last check: 2007-11-06)
		The diabase was injected as a molten liquid, forming a band (sill) several feet high over the Virgin's head.
		The column of diabase extends upward until it meets another horizontal contact surface and the rock formation changes to sandstone at the top of the grotto.
		Both the sandstone and diabase are weathered and the fracture surfaces are weathered in accordance with the respective hardness of each of the rocks.
	mitpress2.mit.edu /e-journals/Leonardo/isast/articles/pizzorusso.html (2128 words)

	Porter GeoConsultancy - Ore Deposit Description
		Diabase (Dolerite), dated in the Ray district at 1140 Ma - occurring as large sills, dykes and irregular masses, composed of brown, grey and green rock made up of coarse to aphanitic plagioclase and pyroxene with lesser amphibole, biotite and oxides.
		Within the district the regional attitude of dykes of diabase is generally steep, with a north-south to NNW trend.
		To the west however the diabase is flat to gently west dipping, while the Diabase Fault is interpreted to flatten to the west with depth.
	www.portergeo.com.au /database/mineinfo.asp?mineid=mn208 (2775 words)

	Lunmac Marble Property - Geological Info - General (Site not responding. Last check: 2007-11-06)
		Locally the intrusive diabase cuts off the dolomite and the marble is present as a series of lenses.
		Where diabase cuts across the dolomite horizon, thermal metamorphism of the dolomite has resulted in the formation of predazzite.
		The drill hole was collared in the diabase capping and encountered the diabase/upper mudstone at a depth of 149.8' (45.7m).
	www.lunmac.com /geol_gen.htm (610 words)

	PGS History
		Lastly, a 200-million-year-old Jurassic diabase sheet is exposed in the northeast area of the park.
		Heat from the diabase sill metamorphosed the adjacent rocks; hornfels, the resulting contact metamorphic rock, can also be found in the park.
		First, the well jointed (that is, fractured) diabase bedrock was progressively broken apart by cyclic freezing and thawing of water in the cracks (frost wedging).
	www.philageo.org /features.html (1527 words)

	USGS B 2123 -- Jurassic Diabase Dikes
		Near-vertical, northwest- and north-trending diabase dikes of Early Jurassic age were emplaced during the extensional event that led to the opening of the Atlantic Ocean.
		The diabase is fine to coarse grained, massive, dense, and composed of plagioclase, augite, olivine, and quartz.
		An 40 Ar/ 39 Ar radiometric date of 200 Ma (Kunk and others, 1992) was obtained from the 4.5-m-wide granophyric diabase dike on the BandO railroad cut along the Potomac River (chemical samples 23-26, table 1, and isotopic sample 1, fig.
	pubs.usgs.gov /bul/b2123/jurassic.html (116 words)

	MSN Encarta - Search Results - diabase
		Diabase, dark-colored intrusive igneous rock with a characteristic coarse texture.
		Chemically and mineralogically, diabase is similar to basalt and...
		Exclusively for MSN Encarta Premium Subscribers--quickly search thousands of articles from magazines such as Time, Newsweek, The Atlantic Monthly, and Smithsonian.
	encarta.msn.com /diabase.html (97 words)

	Caledon Resources - PLC :: Project Information (Site not responding. Last check: 2007-11-06)
		The strata within the axis consists of Lower Carboniferous age Yanguan Fm consisting of siliceous rock, carbonaceous mudstone and diabase.
		The boundary between the diabase and the country rock is easily recognizable.
		Orebodies consist of altered diabase and lesser altered siliceous country rock.
	www.caledonresources.com /project_information/new_projects.php (479 words)

	[No title]
		This database delineates the geologic map unit, diabase dikes, which was mapped at a scale of 1:500,000, for the state of Georgia.
		The diabase dikes were included on the Geologic Map of Georgia, compiled at a scale of 1:500,000, which was published by the Georgia Geologic Survey in 1976.
		Arcs delineating the diabase dikes and registration tics were traced in CorelDraw 7.0 on-screen under high magnification using the scanned (TIFF) image of the 1976 Geologic Map of Georgia as the base.
	csat.er.usgs.gov /statewide/metadata/dikes.txt (2677 words)

	A PRELIMINARY REPORT ON THE MESOZOIC DIABASE DIKES FROM GEORGIA (Site not responding. Last check: 2007-11-06)
		A diabase dike near Sparta intrudes the Pennsylvanian Sparta Granite and surrounding amphibolite facies metamorphic rocks of the Kiokee Belt.
		At Clark Hill the texture is diabasic to subophitic with subhedral plagioclase (An) composing 50-60% of the rock.
		The diabase is olivine normative and lies in the olivine normative group proposed by Weigand and Ragland (1970).
	gsa.confex.com /gsa/2003SC/finalprogram/abstract_49269.htm (431 words)

	ground: news
		The Diabase is a bag that looks more like a briefcase than a backpack.
		The Diabase is orange on the inside for high visibility.
		The back of the Diabase has yet another zippered pocket, this one flat and large enough to slip in multiple file folders, tablets or magazines.
	www.groundwear.com /news.php?&newsitem=10 (595 words)

	A MAGNETIC INVESTIGATION OF DIABASE DIKES IN THE CENTRAL PIEDMONT, VIRGINIA (Site not responding. Last check: 2007-11-06)
		Based exclusively on outcrop data Mesozoic diabase dikes appear to be dextrally offset along the Lakeside fault zone in the central Virginia Piedmont.
		The diabase is highly magnetic compared to the surrounding amphibolite, granitic gneiss, and mylonitic gneiss country rock and showed magnetic relief of up to 1500 gammas.
		The magnetic data are inconsistent with dextral offset of the diabase dikes; rather we interpret there to be a single dike with distinct segments of different orientations.
	gsa.confex.com /gsa/2001SE/finalprogram/abstract_4479.htm (398 words)

	Lake Nipigon
		Broken down into fine granules and dispersed by the elements, much of the diabase eventually settled to the bottom of Lake Nipigon.
		Today, it continues to be washed ashore by wave action, forming the fl sandy beaches for which the park is known.
		Rugged diabase cliffs soar up to 170 metres along the highway which skirts the shores of Lake Helen, part of the Nipigon River system.
	www.ontarioparks.com /english/laken.html (240 words)

	Diabase Farm Preserve. The Natural Lands Trust. Land Conservation in the Greater Philadelphia Region.
		The farm was named for the diabase rock along the crest of the mountain.
		Diabase Farm has been in continual farming since 1763, when it was designated part of William Penn’s 7500-acre "Manor of Highlands." In 1932, the property was purchased by George and Charlotte Dyer, who used it as a steer and sheep farm until 1984, when they donated it to NLT.
		The crop land on the farm is still rented to a local farmer who raises a hay crop.
	www.natlands.org /preserves/preserve.asp?fldPreserveId=50 (189 words)

	Summary of Citation
		One is quartz diabase; others are similar to bedded trap rock but are fresher and form domes.
		Black Rock diabase is not an isolated intrusive plug as first supposed, but is a part of the Hampden diabase sheet.
		Black Rock diabase breccia dike in Granby tuff consists of fragments of diabase, tuff, and sedimentary rocks in diabase matrix.
	ngmdb.usgs.gov /Geolex/Refsmry/sumry_499.html (140 words)

	GUIANA (Guyana, Guayana') - Online Information article about GUIANA (Guyana, Guayana')
		The gold of the placer deposits appears to be derived, not from quartz reefs, but from the schists and intrusive rocks, the selvages of the diabase dikes sometimes containing as much as 5 oz.
		The surface of a large part of the colony is composed of gneiss, and of gneissose granite, which is seen in large water-worn bosses in the river beds.
		These are caused either by old intrusions of diabase and gabbro which have undergone modifications, or by later ones of dolerite.
	encyclopedia.jrank.org /GRA_GUI/GUIANA_Guyana_Guayana_.html (10747 words)

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