Alkaline Rocks and Carbonatites of the World

Setup during HiTech AlkCarb: an online database of alkaline rock and carbonatite occurrences

Patterson Lake

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Occurrence number: 
031-00-204
Country: 
Canada
Region: 
Saskatchewan
Location: 
Longitude: -109.34, Latitude: 57.64
Carbonatite: 
Yes

The Patterson Lake Alkaline Intrusive Complex is found within the Patterson Lake Corridor of north western Saskatchewan, Canada. It is emplaced into crystalline basement orthogneiss of the Taltson Domain, situated at the southern edge of the Athabasca Basin. The complex’s presence is revealed by drill core, with a strike length of ~10 km. Units identified within cores include amphibole syenite, clinopyroxene syenite, clinopyroxenite, carbonatite, and fenitized country rock. Amphibole syenite is massive to weakly foliated, with fibrous eckermanite-arfvedsonite amphibole and sericitized plagioclase. Clinopyroxene syenite are present as xenolith bearing dykes, containing variably altered clinopyroxene and accessory zircon. Clinopyroxenite dykes are in turn cut by calcite-carbonatite dykes, with notable minerals in the latter including aegirine-augite, serpentinised olivine, titanite, barite, and possible melilite. Xenoliths of country rock are common and often partly digested by the carbonatite melt, forming aggregates of calcite, aegirine-augite, and relict feldspar and quartz. Detailed descriptions and photography of drill core textures can be found in Card (2018).

Age: 
1.85 – 1.82 Ga based on age of other alkaline complexes in region (Card, 2018)
References: 
CARD, C., 2018. The Patterson Lake Alkaline Igneous Complex: Evidence for Deep-seated Structural Control in the Patterson Lake Corridor, and Implications for Mineral Exploration. Summary of Investigations 2018, Volume 2, Saskatchewan Geological Survey, Saskatchewan Ministry of Energy and Resources, Miscellaneous Report
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith