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	Gabbro - Wikipedia, the free encyclopedia
		Gabbro is dense, greenish or dark-colored and contains varied percentages of pyroxene, plagioclase, amphibole, and olivine (olivine gabbro when olivine is present in large quantities) The pyroxene is mostly clinopyroxene, small amounts of orthopyroxene my be present.
		Gabbro can be formed as a massive uniform intrusion or as part of a layered ultramafic intrusions as a cumulate rock formed by settling of pyroxene and plagioclase.
		Gabbro is an essential part of the oceanic crust, and can be found in many ophiolite complexes as parts of zones III and IV (sheeted dyke zone to massive gabbro zone).
	en.wikipedia.org /wiki/Gabbro (467 words)

	GABBRO - LoveToKnow Article on GABBRO (Site not responding. Last check: 2007-11-07)
		The gabbros are the plutonic or deep-seated representatives of the dolerites, basalts and diabases (also of some varieties of andesite) with which they agree closely in mineral composition, but not in minute structure.
		Equally characteristic of the gabbros is the alteration of the felspars to cloudy, semi-opaque masses of saussurite.
		Some gabbros are exceedingly coarse-grained and consist of individual crystals several inches in length; such a type often form dikes or veins in serpentine or gabbro, and may be called gabbropegrnatite.
	1.1911encyclopedia.org /G/GA/GABBRO.htm (1595 words)

	Gabbro (Site not responding. Last check: 2007-11-07)
		Gabbro is too fragile to use in construction, but often contains valuable amounts of chromium, nickel, cobalt, gold, silver, platinum, and copper sulfide s.
		Gabbro is a medium or coarse-grained rock that consists primarily of plagioclase...
		Gabbro is the coarse grained plutonic (subsurface) equivalent of basalt lava.
	www.serebella.com /encyclopedia/article-Gabbro.html (560 words)

	[No title] (Site not responding. Last check: 2007-11-07)
		Gabbro is dense, greenish or dark-colored and contains varied percentages of pyroxene, plagioclase feldspar, amphibole, and olivine (called olivine gabbro when olivine is present in large quantities).
		Gabbro may be extremelyy coarse grained to pegmatitic, and some pyroxene-plagioclase cumulates are essentially coarse grained gabbro, although these may exhibit acicular crystal habits.
		Oceanic crust is composed primarily of basalt, gabbro and peridotite....
	www.worldhistory.com /wiki/G/Gabbro.htm (455 words)

	Gabbro (Site not responding. Last check: 2007-11-07)
		Gabbro is a medium or coarse-grained rock that consists primarily of plagioclase feldspar and pyroxene.
		Gabbros are sometimes quarried for dimension stone (the fl granite of commerce), and the San Marcos Gabbro of southern California is used for gauge blocks, but the true economic value of gabbro is minor.
		There are also gabbro complexes that are inhomogeneous and not regularly layered, as the large, basinlike intrusion at Sudbury, Ontario, and some of the larger diabase sills (tabular intrusions), as the Palisades, New Jersey; and many of the Karoo diabases (fine-grained gabbro) in South Africa.
	geology.csupomona.edu /alert/igneous/gabbro.htm (320 words)

	Gabbro, a BWCAW Lake
		Gabbro is a large lake in the Kawishiwi River watershed, 12½ miles WNW of Forest Center, and 11 miles ESE of Ely.
		The forests which ring Gabbro are of many ages, the youngest being that off the northwest end which was logged by the St. Croix Lumber Company of Winton in the first decade of this century.
		The Gabbro area did sustain damage in the Fourth of July windstorms of 1999, with standing tree losses estimated at 10% to 33% for the area north and east of the lake as far as Turtle and Clearwater.
	www.rook.org /earl/bwca/lakes/lakes6/gabbro.html (397 words)

	card 5 GABBRO (Site not responding. Last check: 2007-11-07)
		Picture 1 shows two handsamples of gabbro, which is mostly composed of calcium-rich plagioclase feldspar, a light-colored mineral, and pyroxene and olivine, dark-colored minerals which give gabbro a dark green to fl color overall.
		Big Rock is mostly composed of granite, but the dark rocks within the granite are chunks of gabbro which were broken and included into the felsic magma as it intruded into the subsurface approximately 100 million years ago.
		The gabbro here is in the form of an igneous dike.
	seis.natsci.csulb.edu /basicgeo/GABBRO/GABBRO.html (197 words)

	gabbro - Hutchinson encyclopedia article about gabbro (Site not responding. Last check: 2007-11-07)
		Gabbro is an igneous rock which forms in major plutonic intrusions.
		Gabbro is the plutonic version of basalt (that is, derived from magma that has solidified below the Earth's surface), and forms in large, slow-cooling intrusions.
		This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.
	encyclopedia.farlex.com /gabbro (128 words)

	Gabbro (Site not responding. Last check: 2007-11-07)
		Gabbro is a dark colored plutonic rock composed mainly of coarse grains of calcium rich plagioclase feldspar and pyroxene.
		Gabbros may occur as border rocks around granitic and other plutons, or as small individual plutons or dikes.
		Most gabbros appear to intrude the rocks surrounding them and so are thought to be of igneous origin, although some may also be produced by metamorphic processes.
	socrates.berkeley.edu /~eps2/wisc/gabbro.html (119 words)

	Gabbro erratic by the Trent River, Campbellford, Ontario, Canada
		Gabbro is relatively common, a coarsely crystalline igneous rock which cooled slowly from molten magma deep within the Earth's crust.It is generally grey, green or fl in colour, darker than most granites, which are commonly pink, pale grey or white.
		There are numerous bodies of gabbro and associated rocks in southeast Ontario, including the Lavant mass north of Sharbot Lake, the Raglan Hills east of Bancroft, and several examples between Bancroft and Madoc, near the line of the Old Hastings Road (Easton, 1992; Wilson, 1994).
		The centre of the gabbro mass is only 23 km north (and slightly east) of the town, a very modest distance for such a block to travel.
	www.turnstone.ca /gabbro.htm (1362 words)

	GABBRO (Site not responding. Last check: 2007-11-07)
		Mit sinkendem Anteil an diesen Mineralen geht Gabbro gleitend in Peridodit über, den Hauptbestandteil des oberen Erdmantels.
		Gabbro findet sich vor allem in der ozeanischen Erdkruste, seltener auch in der kontinentalen.
		Gabbro wurde erstmals durch den deutschen Geologen Christian Leopold von Buch nach einer Ortschaft in der italienischen Region Toskana benannt.
	www.toonorama.com /encyclopedia/G/Gabbro (165 words)

	GABBRO - Online Information article about GABBRO (Site not responding. Last check: 2007-11-07)
		Thus magnetite, apatite and picotite, with olivine, may be enclosed in augite, hornblende, and hypersthene, sometimes with a later growth of biotite, while the felspars occupy the interspaces between the clusters of ferromagnesian minerals.
		Hornblende-gabbros are distinctly rare, except when the hornblende has been developed from pyroxene by pressure and shearing, but many rocks may be described as hornblende- or biotite-bearing gabbro and norite, when they contain these ingredients in addition to the normal minerals plagioclase, augite and hypersthene.
		In areas of gabbro there are often masses consisting nearly entirely of a single mineral, for example, felspar rocks (anorthosites), augite or hornblende rocks (pyroxenites and hornblendites) and olivine rocks (dunites or peridotites).
	encyclopedia.jrank.org /FRA_GAE/GABBRO.html (1907 words)

	GEOLOGY OF THE CSUH CAMPUS -- A PIECE OF ANCIENT OCEAN CRUST
		The campus gabbro is a grayish-green, visibly crystalline igneous rock (which was once molten and cooled at depth where large crystals form).
		The campus gabbro is thought to have formed at a divergent plate margin.
		The campus gabbro, some of the least altered available, is exposed in small excavations along the east side of the sidewalk between the Campus Corner and Orient Express foodstands and the University Union.
	www.mcs.csuhayward.edu /~shirschf/csuhgeo.html (1298 words)

	Olympus Microscopy Resource Center: Polarized Light Microscopy Gallery - Gabbro
		Gabbro is a name originally bestowed by the Italians to a type of serpentine, but the term is now generally utilized to describe a coarsely grained igneous rock chemically equivalent to basalt.
		Widely distributed on Earth and the moon, gabbro is sometimes mined in quarries for use in the building industry, but is much more valuable as a source of copper, nickel, cobalt, platinum, and iron ores.
		Darkly or greenish colored, gabbro is an intrusive rock formed when molten magma becomes trapped in cracks or other layers of rock and gradually cools into a rigid, crystalline mass.
	www.olympusmicro.com /galleries/polarizedlight/pages/gabbrosmall.html (191 words)

	Gabbro av Av Nangijala
		Gabbro was born in Norway in a well known working dog kennel.
		Gabbro shows himself in a flashy outgoing personality, he is a crowd pleaser...
		Gabbro is of a very sociable temperamment, naturally very secure towards people and environment.
	www.lescaut.com /gabbro_av_av_nangijala.htm (277 words)

	Gabbro Data (Site not responding. Last check: 2007-11-07)
		Description: Gabbro* is an intrusive igneous rock composed primarily of calcium-rich plagioclase feldspar (which is commonly gray), olivine and various pyroxenes (dark minerals).
		Gabbro and basalt (its extrusive equivalent) are said to be mafic rocks because of their dark tone, in contrast to the light tone of the felsic/sialic rocks granite and rhyolite, and intermediate tone of diorite/andesite.
		The coarse size of the dark mineral grains in gabbro can be discerned by rotating a fresh specimen in the light to look for flashes of light reflecting off of cleavage faces in the plagioclase feldspar and pyroxene grains.
	www.uwm.edu /Course/422-100/Mineral_Rocks/gabbro.data.html (146 words)

	olivine.htm
		Olivine is widespread in basalts and gabbros, and is often the first mineral to form magmas of this composition.
		ASHLAND COUNTY: Olivine is widespread in gabbros, ferrodiorite and anorthosites of the Mineral Lake Intrusion northwest of Mellen, where it is associated with plagioclase and clinopyroxene (Klewin, et.
		IRON COUNTY: Olivine is widespread in small grains in the Keweenawan gabbroic and basaltic rocks in the county.
	www.uwrf.edu /~wc01/olivine.htm (848 words)

	THE OLIVINE GABBRO SUITE SEPARATELY CONSIDERED
		Although injection of oxide gabbros at so many places in the core has greatly fragmented the stratigraphy of the underlying olivine gabbro suite, the spreadsheet for igneous contacts appended as a supplement to the site report (Shipboard Scientific Party, 1999c) and Appendix II of Dick et al.
		Each alternation of coarse-grained olivine gabbro and finer-grained, more olivine-rich gabbro or troctolite beneath it, combining two or more composite intervals, can be treated as a potential individual injection or series of pulses of magma that contributed to the thickness of the crust of Hole 735B at any one place in the section.
		The one truly substantial mass of oxide gabbro in the core therefore is a composite body of extensively differentiated material that intruded the section right at the top of the largest mass of olivine gabbro cored in the entire hole.
	www-odp.tamu.edu /publications/176_SR/synth/s_6.htm (1540 words)

	Gabbro (Site not responding. Last check: 2007-11-07)
		Gabbro is a dark, coarse-grained intrusive igneous rock chemicallyequivalent to basalt.
		It is a plutonic rock,formed when molten magma is trapped beneath the Earth's surface and cools slowly into a hard, coarsely crystalline mass.
		Quartz gabbros are also known to occur and are probably derivedfrom magma that was oversaturated with silica.On the other hand, essexites representgabbros whose parent magma had an insufficiency of silica resulting in the formation of nephelite.
	www.therfcc.org /gabbro-131162.html (154 words)

	Gabbro (Site not responding. Last check: 2007-11-07)
		They are very close, having reached the "gabbro" layer of oceanic crust for the first time.
		team's goal was narrower: using a 10-inch-wide drill, they wanted to reach the bottom of the oceanic crust, a granitelike layer known as gabbro, nearly a mile...
		The Tib gabbro, with a surface exposure of some 25 square km.
	gabbro.wikiverse.org (298 words)

	The Ben Buie Layered Gabbro - Mull
		The Ben Buie gabbro is associated with Centre 1 of the central intrusive complex.
		The study of this gabbroic complex is on-going, with a major mapping and sampling program being initiated next spring/summer.
		Although it is common for large layered gabbroic complexes to have a "border series", the preservation of a distinct chilled margin is rare.
	www.abdn.ac.uk /geology/profiles/auming/mull/benbuie/benbuie.htm (621 words)

	Little Gabbro, a BWCAW Lake
		Little Gabbro is a rather small, relatively shallow lake on the South Kawishiwi River, 14½ miles WNW of Forest Center, and 10 miles ESE of Ely.
		Little Gabbro supports four established campsites, two on the north shore, on either side of the Kawishiwi River outlet, one on the western shore, and a fourth on an island in the narrows connecting with Gabbro to the east.
		Like big Gabbro to the east, Little Gabbro takes its name from gabbro, a dark, massive rock with crystals large enough to be seen with the naked eye.
	www.rook.org /earl/bwca/lakes/lakes6/littlegabbro.html (468 words)

	Delaware Geological Survey
		The Bringhurst Gabbro: A GeoAdventure in the Delaware Piedmont
		A close look shows the minerals in the gabbro are between 1/4 and 2 inches in length and 1/4 to 1 inch in diameter (Figure 3).
		This is possibly because the light-colored inclusions melted at a lower temperature than the dark inclusions, and the light inclusions melted in the hot gabbroic magma of the pluton becoming commingled and no-longer recognizable.
	www.udel.edu /dgs/Education/bringhurst.html (782 words)

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