Troctolite

Troctolite

Troctolite is a rare ultramafic intrusive rock type. It consists essentially of variable amounts of olivine and calcic plagioclase along with variable minor pyroxene. It thus is "midway" between peridotite and anorthosite.

Troctolite is found in some Ultramafic to mafic layered intrusions such as in the Archean Windimurra intrusion of West Australia, the Voisey's Bay nickel-copper-cobalt magmatic sulfide deposit of northern Labrador, [http://gac.esd.mun.ca/gac_2001/seven/sub_program.asp?sess=98&form=10&abs_no=237 "Geology of the Voisey's Bay Deposits" abstract] the Stillwater igneous complex of Montana and the Tertiary Rhum layered intrusion of the island of Rùm, Scotland. [http://www.turnstone.ca/rhumal.htm Troctolite (allivalite): Isle of Rhum, northwestern Scotland] Troctolite is also found in the Merensky Reef of the Bushveld Igneous Complex, South Africa and in The Lizard ophiolite in Cornwall. [http://www.projects.ex.ac.uk/geomincentre/06The%20Lizard.pdf The Lizard]

References

* Blatt, Harvey and Robert J. Tracy, 1996, "Petrology: Igneous, Sedimentary and Metamorphic," 2nd ed., p. 72, Freeman, ISBN 0-7167-2438-3


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