Norite
Taurus-Littrow valley on the moon during the Apollo 17
mission (sample 78236).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
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 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 comet impact and the world's second-largest nickel mining region.[4][5][6][7][8]
Norite is a common rock type of the
intrusions such as the Gombak norite in Bukit Batok, Singapore. It is also plentiful in the Sokndal intrusion area of southwestern Norway, with titanium deposits to the east.[9]
References
- ^ "Norite". alexstrekeisen.it. Retrieved March 1, 2018.
- ^ Carmichael, Turner and Verhoogen, 1974, Igneous Petrology, McGraw-Hill, pp. 603–620
- ^ Hyndman, Donald W., 1972, Igneous and Metamorphic Petrology, McGraw-Hill, pp. 122–139, esp. references.
- ^ Judith A.Kinnaird. "The Bushveld Large Igneous Province" (PDF). School of Geosciences, University of the Witwatersrand. Retrieved March 1, 2018.
- ^ Troels F. D. Nielsen. "The Shape and Volume of the Skaergaard Intrusion, Greenland: Implications for Mass Balance and Bulk Composition". Journal of Petrology, Volume 45, Issue 3, 1 March 2004, Pages 507–530. Retrieved March 1, 2018.
- ^ I. S. McCallum. "The Stillwater Complex: A review of the geology" (PDF). University of Washington. Retrieved March 1, 2018.
- ^ Ulrich Riller. "Structural characteristics of the Sudbury impact structure, Canada: Impact-induced versus orogenic deformation—A review" (PDF). Meteoritics & Planetary Science.40, Nr 11, 1723–1740 (2005). Retrieved March 1, 2018.
- ^ Peer-Richard Neeb (May 15, 2005). "Mineral resources in Norway" (PDF). Geological Survey of Norway. NGU report 2005. 042. Retrieved March 1, 2018.