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Troctolita

Infotaula de rocaTroctolita
Tipusroques plutòniques
Minerals essencialslabradorita, ortopiroxè i olivina
Referències[1]

Les troctolites són roques ígnies màfiques i intrusives formades essencialment, tot i que en quantitats variables, per olivina i plagiòclasi càlcica juntament amb piroxè accessori. El seu nom prové del grec troktḗs, ‘truita’, a causa de l'aspecte pigallat verd de l'olivina sobre la plagiòclasi blanquinosa. Són anortosites riques en olivina o gabres empobrits en piroxè. Les troctolites es troben en algunes intrusions en capes com ara les de la intrusió arqueana de Windimurra (Austràlia), el dipòsit de sulfurs de níquel, coure i cobalt de Voisey’s Bay (Labrador),[2] el complex de Stillwater (EUA) i la intrusió en capes de Tertiary Rhum (Escòcia).[3] També es troben troctolites al Merensky Reef (Bushveld, Sud-àfrica) i al complex Lizard (Cornualla).[4]

Referències

[modifica]
  1. «Lamproïta». Diccionari de Geologia. [Consulta: 23 octubre 2017].[Enllaç no actiu]
  2. Sulphide segregation in the Mushuau Intrusion of northern Labrador as recorded by nickel-in-olivine magmatic stratigraphy Arxivat 2017-10-23 a Wayback Machine. abstract, BRADLEY, L.A. and SYLVESTER, P.J., Department of Earth Sciences, Memorial University of Newfoundland, St. John's, NF, A1B 3X5
  3. [enllaç sense format] http://www.turnstone.ca/rhumal.htm Troctolite (allivalite): Isle of Rhum, northwestern Scotland
  4. The Lizard
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Troctolita
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