Alkaline Rocks and Carbonatites of the World

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Kusk Lake


Occurrence number: 
Longitude: -81.03, Latitude: 46.02

In an area of about 1000x600 m east-northeast of Kusk Lake feldspathic sandstones and greywackes of the Mississagi Formation (Huronian Supergroup) are fenitized. Various stages of brecciation, disappearance of quartz, and development of aegirine, riebeckite and alkali feldspar have been recognized and mapped. The most highly evolved rocks are essentially syenitic. Associated igneous rocks do not appear to crop out at the surface. Rock analyses, including trace elements, and microprobe analyses of K-feldspar and magnesioriebeckite have been published.

SIEMIATKOWSKA, K.M. and MARTIN, R.F. 1975. Fenitization of Mississagi Quartzite, Sudbury area, Ontario. Bulletin of the Geological Society of America, 86: 1109-22
Fig. 41 Kusk Lake and Nemag Lake fenites (after Siemiatkowska and Martin, 1975, Fig. 2).
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith