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and many of the Karoo diabases (fine-grained gabbro) in South Africa. A lopolith at Duluth, Minn., is a notable exception to the rather arbitrary division between layered and unlayered gabbro complexes. The lower part of this mass has the average composition of an olivine gabbro but is strongly banded.
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geology.csupomona.edu/alert/igneous/gabbro.htm
geology.csupomona.edu/alert/igneous/gabbro.htm
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Paleontology question: What is the mineral composition of gabbro? Pyroxene, plagioclase feldspar, amphibole, and olivine. ... Which minerals are present in gabbro? Mineral composition of red sandstone? What is rhyolite mineral composition? Can Gabbro contain the mineral Quartz? What are the main comstituents of gabbro?
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wiki.answers.com/Q/What_is_the_mineral_composition_of_g...
wiki.answers.com/Q/What_is_the_mineral_composition_of_gabbro
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Likewise, basalt (a mafic extrusive rock) has the same mineral composition of the mafic intrusive rock, gabbro. This generalized composition of felsic and mafic can be subdivided into intermediate (between felsic and mafic composition), and ultramafic (rocks extremely enriched in magnesium and iron).
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vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Notes/igneou...
vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Notes/igneous_rocks.html
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Gabbro is typically dark gray, greenish gray, to black, mafic in composition, with visible crystals of plagioclase feldspar (Ca-rich varieties), hornblende, pyroxene, and lesser amounts of biotite mica, magnetite, and other minerals.
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vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Notes/gabbro...
vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Notes/gabbro.html
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The sequences together make up three series of olivine gabbro and allied troctolite. The upper two occupy about the upper one-third of the cored section. They are more primitive than the lowest, being more calcic and magnesian in bulk composition and having more calcic plagioclase and forsteritic olivine.
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www-odp.tamu.edu/publications/176_SR/synth/synth.htm
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Gabbro. Geology. A plutonic rock with a composition similar to that of basalt. GABION. Gabion. Foundation. Syn. with CRIB. GABION WALL. Mur de gabions ...
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www.springerlink.com/index/q30028x265w67h21.pdf
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Quabbin Reservation is an ideal site to study effects of the bedrock chemical weathering and the plant cover on the composition of surface waters in a pristine environment.
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gsa.confex.com/gsa/2001NE/finalprogram/abstract_2755.ht...
gsa.confex.com/gsa/2001NE/finalprogram/abstract_2755.htm
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Evidence from Apollo 11 and Apollo 12 samples and telescopic spectral reflectivity measurements indicates that the maria are similar in mineralogy on a regional scale and that the highlands are consistent with an anorthositic-gabbro composition.
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www.sciencemag.org/cgi/content/short/171/3971/567
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The Central Indian Ridge is mantled with flows of low-potassium basalt of uniform composition. Gabbro, anorthosite, and garnet-bearing lherzolite are exposed in cross fractures, and lherzolite is the bedrock at the center of the ridge.
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www.sciencemag.org/cgi/content/abstract/166/3909/1136
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