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 and the Tertiary Rhum layered intrusion of the island of Rùm, Scotland.

[edit] References

Troctolite (allivalite): Isle of Rhum, northwestern Scotland Accessed Jan. 5. 2006
Geology of the Voisey's Bay Deposits abstract Accessed Jan. 5. 2006
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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