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Quartzolite

From Wikipedia, the free encyclopedia
Not to be confused withquartzite orsilex.
Extremely rare igneous rock made mostly of quartz
Quartzolite at the Qvertex of theQAPF diagram forplutonic rocks

Quartzolite orsilexite is anintrusiveigneous rock, in which themineralquartz is more than 90% of the rock'sfelsic mineral content, withfeldspar at up to 10%.[1]: 135 [2] Typically, quartz forms more than 60% of the rock,[3] the rest being mostly feldspar although minor amounts ofmica oramphibole may also be present.[2] Quartzolite occurs asdykes,sills,veins,bosses and segregation masses;[3][4] it is also found in association withgreisen andpegmatite.[5][6][7] Quartzolite is an extremely rare type of rock.[8] Noextrusive rock equivalent of quartzolite is known.[9]

Synonyms

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The use of the synonym "silexite" is discouraged because it is the French word forchert, which is asedimentary rock.[10] Other less common synonyms are "igneous quartz" and "peracidite".[11]

Examples

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Formation

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Some occurrences of quartzolite are unlikely to have an entirely igneous origin;[8] for example, two types of quartzolite that are associated with deposits oftopaz in and around the MoleGranitepluton in Torrington,NSW, are believed to have formed in different ways. One type forms dykes and sills in the granite and in the surroundingmetamorphic rocks. The other type has remnants of an earlier granitetexture and is found on the outer edges of part of the pluton.[19]

References

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  1. ^abLe Maitre, R. W., ed. (2002).Igneous Rocks:A Classification and Glossary of Terms (2nd ed.). Cambridge: Cambridge University Press.ISBN 978-0-521-66215-4.
  2. ^ab"Quartzolite".BGS Rock Classification Scheme.British Geological Survey. Retrieved20 November 2016.
  3. ^ab"Definition of silexite". mindat.org. Retrieved20 November 2016.
  4. ^Lishmund, S.R. (1974)."The Torrington silexite deposits".Geological Survey of New South Wales: Quarterly Notes.17:3–6.
  5. ^abFraser, Dean (2013)."Ackley Mo-Sn-F-W"(PDF).Newfoundland & Labrador: Explore The Opportunities. Matty Mitchell Prospectors Resource Room. Retrieved21 November 2016.
  6. ^abKlominsky, Josef; Fediuk, Ferry; Veselovsky, Frantisek; Schovanek, Pavel; Jarchovsky, Tomas; Taborsky, Zdenìk (2003)."Topazový Kvarcolit (Greisen) u Chrastavy v Severních Čechách Jako Metalogenetický Indikátor W-Sn Mineralizace" [Topaz quartzolite (greisen) near Chrastava in Northern Bohemia – metallogenic indicator of the W-Sn mineralization](PDF).Zprávy o geologických výzkumech v roce (in Czech):112–114.ISSN 0514-8057.
  7. ^abZozulya, D.; Lyalina, L.; Macdonald, R.; Bagiński, B.; Savchenko, Y.; Jokubauskas, P. (2019)."Britholite Group Minerals from REE-Rich Lithologies of Keivy Alkali Granite—Nepheline Syenite Complex, Kola Peninsula, NW Russia".Minerals.9 (12): 732.Bibcode:2019Mine....9..732Z.doi:10.3390/min9120732.
  8. ^abGillespie, M.R.; Styles, M.T. (1999)."BGS Rock Classification Scheme, Volume 1: Classification of igneous rocks". British Geological Survey. p. 10. Retrieved19 November 2016.
  9. ^Schumann, Walter (1993).Handbook of Rocks, Minerals, and Gemstones. Boston: Houghton-Mifflin Company. p. 198.ISBN 978-0-395-51138-1.
  10. ^Neuendorf, K. K. E.; Mehl, Jr., J. P.; Jackson, J. A. (2005).Glossary of Geology (5th ed.). Alexandria, Virginia: American Geological Institute. p. 530.ISBN 978-3642066214.
  11. ^Manutchehr-Danai, M. (2009). "Silexite".Dictionary of Gems and Gemology (3rd ed.). Berlin: Springer. p. 778.doi:10.1007/978-3-540-72816-0_19824.ISBN 978-3-540-72795-8.
  12. ^Jackson, Norman J.; Douch, Colin J. (1986). "Jabal Hamra REE-mineralized silexite, Hijaz region, Kingdom of Saudi Arabia".Journal of African Earth Sciences.4:269–274.Bibcode:1986JAfES...4..269J.doi:10.1016/S0899-5362(86)80088-4.
  13. ^Miller, William J. (1919)."Pegmatite, Silexite, and Aplite of Northern New York".The Journal of Geology.27 (1):28–54.Bibcode:1919JG.....27...28M.doi:10.1086/622638.
  14. ^Li, Huaqin; Chen, Fuwen (2002). "Chronology and origin of Au-Cu deposits related to paleozoic intracontinental rifting in West Tianshan Mountains, NW China".Science in China Series B: Chemistry.45:108–120.doi:10.1007/BF02932212.
  15. ^Shokouhian Rad, A . R.; Kazemi Koohbanani, Hadi; Kazemi Koohbanani, S.; Kazemi Koohbanani, N. (2014)."Petrology and Petrogenesis of Intrusive in North-East Saveh, Iran"(PDF).International Journal on Technical and Physical Problems of Engineering.6:6–11.ISSN 2077-3528.
  16. ^Mair, B.F. (1987). "The Geology of South Georgia: VI. Larsen Harbour Formation".British Antarctic Survey Scientific Reports.111:1–60.
  17. ^Greenberg, R.M.; Miranda, E. (2009), "Strain localization in granodiorite mylonites: a microstructural and electron backscatter diffraction (EBSD) study of the South Mountains core complex, Arizona",AGU Fall Meeting Abstracts,2009: T33A–1859,Bibcode:2009AGUFM.T33A1859G
  18. ^"Topaz"(PDF).Industrial Mineral Opportunities.NSW Department of Primary Industries. Retrieved23 November 2016.
  19. ^Skinner, Mike (2015)."The Torrington Project"(PDF). Top Tung. Archived fromthe original(PDF) on 24 November 2016. Retrieved23 November 2016.
Types of rocks
Igneous rock
Sedimentary rock
Metamorphic rock
Specific varieties
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