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Gabbro

gabbro

A Dictionary of Earth Sciences | 1999 | | Copyright

gabbro A coarse-grained, basic igneous rock, consisting of essential calcium-rich plagioclase feldspar (approximately 60%), clinopyroxene (augite or titanaugite), and orthopyroxene (hypersthene or bronzite), plus or minus olivine with accessory magnetite or ilmenite. Gabbros result from the slow crystallization of magmas of basaltic composition, and like the basalts they can be divided into tholeiitic and alkali types (compare ALKALI BASALT; and THOLEIITE). Tholeiitic gabbros are characterized by the presence of two pyroxene types (augite and hypersthene) and interstitial silica-rich glass, whereas alkali gabbros are characterized by one calcium/titanium-rich pyroxene (titanaugite) and scattered interstitial feldspathoid minerals. Many large gabbroic intrusions display mineral layering, testifying to the complex processes taking place within basic magma chambers. Gabbros are commonly found intruded as ring complexes (e.g. Ardnamurchan and Skye in Scotland), large lopoliths (Bushveld complex, S. Africa), or layered complexes (Skaergaard in eastern Greenland being the most famous).
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AILSA ALLABY and MICHAEL ALLABY. "gabbro." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 12 Feb. 2012 <http://www.encyclopedia.com>.

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gabbro

The Concise Oxford Dictionary of English Etymology | 1996 | | Copyright

gabbro (min.) rock composed of feldspar and diallage. XIX. — It. (Tuscan) :- L. glaber, glabr- smooth.
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T. F. HOAD. "gabbro." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 12 Feb. 2012 <http://www.encyclopedia.com>.

T. F. HOAD. "gabbro." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (February 12, 2012). http://www.encyclopedia.com/doc/1O27-gabbro.html

T. F. HOAD. "gabbro." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved February 12, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-gabbro.html

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gabbro

The Columbia Encyclopedia, 6th ed. | 2008 | Copyright

gabbro see basalt .

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gabbro

Oxford Dictionary of Rhymes | 2007 | Copyright

gabbro •arrow, barrow, farrow, harrow, Jarrow, marrow, narrow, sparrow, taro, tarot, Varro, yarrow •gabbro • Avogadro • Afro • aggro •macro • cilantro • Castro •wheelbarrow •Faro, Kilimanjaro, Pissarro, Pizarro, Tupamaro •Pedro • allegro • hedgerow • velcro •escrow •metro, retro •electro • Jethro •bolero, caballero, dinero, Faeroe, pharaoh, ranchero, sombrero, torero •scarecrow • Ebro •Montenegro, Negro •repro • in vitro • Pyrrho • synchro •windrow • impro • intro • bistro •Babygro • McEnroe •biro, Cairo, giro, gyro, tyro •fibro • micro • maestro •borrow, Corot, morrow, sorrow, tomorrow •cockcrow • cointreau •Moro, Sapporo, Thoreau •Mindoro • Yamoussoukro •Woodrow •burro, burrow, furrow •upthrow •De Niro, hero, Nero, Pierrot, Pinero, Rio de Janeiro, sub-zero, zero •bureau, chiaroscuro, Douro, enduro, euro, Ishiguro, Oruro, Truro •Politburo • guacharo • Diderot •vigoro • Prospero • Cicero • in utero •Devereux • Jivaro • overthrow

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