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{{Unreferenced stub|auto=yes|date=December 2009}} |
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'''Norite''' is a [[mafic]] [[intrusive]] [[igneous rock]] composed largely of the [[calcium]]-rich [[plagioclase]] [[labradorite]] and [[hypersthene]] with [[olivine]]. Norite is essentially indistinguishable from [[gabbro]] without [[thin section]] study under the [[petrographic microscope]]. It occurs with gabbro and other mafic to [[ultramafic]] rocks in [[layered intrusion]]s which are often associated with [[platinum]] [[ore]]bodies such as in [[South Africa]], the [[Skaergaard intrusion|Skaergaard igneous complex]] of [[Greenland]], and the [[Stillwater igneous complex]] in [[Montana]], [[USA]]. Norite is also the basal igneous rock of the [[Sudbury Basin]] complex in [[Ontario]] which is the site of a [[impact event|meteorite impact]] and the world's second largest [[nickel]] mining region. Norite is a common rock type of the [[Moon rock|Apollo samples]]. On a smaller scale, norite can be found in small localized [[intrusion]]s such as the Gombak Norite in [[Bukit Gombak]], [[Singapore]]. |
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[[File:Norite 1.jpg|thumb|sample of norite]] |
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The name ''Norite'' is derived from the Norwegian name for Norway: '''Norge'''. |
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[[File:Sample 78236 Apollo 17.gif|thumb|right|Shocked norite found in the [[Taurus-Littrow]] valley on the moon during the [[Apollo 17]] mission (sample 78236).]] |
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'''Norite''' is a [[mafic]] [[Intrusive rock|intrusive]] [[igneous rock]] composed largely of the [[calcium]]-rich [[plagioclase]] [[labradorite]], orthopyroxene, and [[olivine]]. The name ''norite'' is derived from Norway, by its Norwegian |
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name ''Norge''.<ref>{{cite web|url = http://www.alexstrekeisen.it/english/pluto/norite.php |title= Norite|publisher = alexstrekeisen.it|accessdate= March 1, 2018}}</ref> |
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Norite, also known as [[orthopyroxene]] [[gabbro]], may be essentially indistinguishable from gabbro without [[thin section]] study under the [[petrographic microscope]]. The principal difference between norite and gabbro is the type of [[pyroxene]] of which it is composed. Norite is predominantly composed of orthopyroxenes, largely high-magnesian [[enstatite]] or an iron-bearing [[hypersthene]]. The principal pyroxenes in gabbro are [[clinopyroxene]]s, generally iron-rich [[augite]]s.<ref>Carmichael, Turner and Verhoogen, 1974, Igneous Petrology, McGraw-Hill, pp. 603–620</ref><ref>Hyndman, Donald W., 1972, ''Igneous and Metamorphic Petrology,'' McGraw-Hill, pp. 122–139, esp. references.</ref> |
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[[Category:Ultramafic rocks]] |
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Norite occurs with gabbro and other mafic to [[ultramafic]] rocks in [[layered intrusion]]s which are often associated with [[platinum]] [[ore]]bodies such as in the Bushveld Igneous Complex in [[South Africa]], the [[Skaergaard intrusion|Skaergaard igneous complex]] of [[Greenland]], and the [[Stillwater igneous complex]] in [[Montana]]. Norite is also the basal igneous rock of the [[Sudbury Basin]] complex in [[Ontario]], which is the site of a [[impact event|comet impact]] and the world's second-largest [[nickel]] mining region.<ref>{{citation| last=Petrus| first = Joseph A.|last2= Ames | first2= Doreen E. | last3 = Kamber |first3= Balz S.| journal= Terra Nova| date= October 18, 2014| doi= 10.1111/ter.12125| title=On the track of the elusive sudbury impact: geochemical evidence for a chondrite or comet bolide (accepted for publication)| doi-access= free}}</ref><ref>{{cite web|url = http://www.largeigneousprovinces.org/sites/default/files/BushveldLIP.pdf|title=The Bushveld Large Igneous Province |publisher = School of Geosciences, University of the Witwatersrand |author= Judith A.Kinnaird |accessdate= March 1, 2018}}</ref><ref>{{cite web|url = https://academic.oup.com/petrology/article/45/3/507/1396172 |title= The Shape and Volume of the Skaergaard Intrusion, Greenland: Implications for Mass Balance and Bulk Composition |
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|publisher = Journal of Petrology, Volume 45, Issue 3, 1 March 2004, Pages 507–530|author= Troels F. D. Nielsen|accessdate= March 1, 2018}}</ref><ref>{{cite web|url = http://www.d.umn.edu/~mille066/Teaching/5100/Articles/McCallum.Stillwater.pdf|title= The Stillwater Complex: A review of the geology|publisher = University of Washington|author= I. S. McCallum|accessdate= March 1, 2018}}</ref><ref>{{cite web|url = http://www.largeigneousprovinces.org/sites/default/files/BushveldLIP.pdf|title= Structural characteristics of the Sudbury impact structure, Canada: Impact-induced versus orogenic deformation—A review|publisher = Meteoritics & Planetary Science.40, Nr 11, 1723–1740 (2005)|author= Ulrich Riller |accessdate= March 1, 2018}}</ref> |
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Norite is a common rock type of the [[Moon rock|Apollo samples]]. On a smaller scale, norite can be found in small localized [[intrusion]]s such as the [[Geology of Singapore|Gombak norite]] in [[Bukit Batok]], [[Singapore]]. It is also plentiful in the [[Sokndal]] intrusion area of southwestern Norway, with [[titanium]] deposits to the east.<ref>{{cite web|url = http://www.ngu.no/FileArchive/227/2005_042.pdf|title= Mineral resources in Norway|publisher = Geological Survey of Norway. NGU report 2005. 042|author= Peer-Richard Neeb|date= May 15, 2005|accessdate= March 1, 2018}}</ref> |
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{{Petrology-stub}} |
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==References== |
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[[de:Norit]] |
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{{Reflist}} |
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[[fr:Norite]] |
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{{Rock type}} |
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[[it:Norite]] |
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[[he:נוריט]] |
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[[ |
[[Category:Mafic rocks]] |
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[[nl:Noriet]] |
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[[pl:Noryt]] |
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[[pt:Norito]] |
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[[uk:Норит]] |
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Norite is a mafic intrusive igneous rock composed largely of the calcium-rich plagioclase labradorite, orthopyroxene, and olivine. The name norite is derived from Norway, by its Norwegian name Norge.[1]
Norite, also known as orthopyroxene gabbro, may be essentially indistinguishable from gabbro without thin section study under the petrographic microscope. The principal difference between norite and gabbro is the type of pyroxene of which it is composed. Norite is predominantly composed of orthopyroxenes, largely high-magnesian enstatite or an iron-bearing hypersthene. The principal pyroxenes in gabbro are clinopyroxenes, generally iron-rich augites.[2][3]
Norite occurs with gabbro and other mafic to ultramafic rocks in layered intrusions which are often associated with platinum orebodies such as in the Bushveld Igneous Complex in South Africa, the Skaergaard igneous complexofGreenland, and the Stillwater igneous complexinMontana. Norite is also the basal igneous rock of the Sudbury Basin complex in Ontario, which is the site of a comet impact and the world's second-largest nickel mining region.[4][5][6][7][8]
Norite is a common rock type of the Apollo samples. On a smaller scale, norite can be found in small localized intrusions such as the Gombak noriteinBukit Batok, Singapore. It is also plentiful in the Sokndal intrusion area of southwestern Norway, with titanium deposits to the east.[9]
