File:Microsyenite dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 1 (47924583066).jpg

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Microsyenite in the Precambrian of Ontario, Canada.

At this locality, granodiorites of the Mission Stock have been intruded by unusual igneous dikes composed of monchiquite lamprophyre and orangish-red microsyenite. The photo shows the microsyenite dike running vertically through the center.

The geologic literature describes the microsyenite here as having rare, subhedral K-feldspar microphenocrysts in a groundmass of hematite-coated orthoclase feldspar, minor quartz, sodium-amphibole, and opaque oxide minerals. [Info. from Massey, 1985, p. 43.]

The age of the microsyenite is probably Proterozoic, and possibly late Mesoproterozoic. Massey (1985) and Wilson (2006) suggest that this dike was emplaced at about the same time as the nearby Firesand River Carbonatite Complex, which dates to 1.078 Ga.

Locality: Michipicoten River Bridge South Outcrop - roadcut on the western & eastern sides of Route 17, south of the Michipicoten River bridge & northeast of Roller Lake, south-southwest of the town of Wawa, Michipicoten Greenstone Belt, Ontario, southeastern Canada (47° 54' 54.46" North latitude, 84° 48' 35.46" West longitude) (= stop 7 of Wilson (2006) - Unusual Archean Diamond-Bearing Rocks of the Wawa Area, p. 28.)

Reference cited:

Massey (1985) - Geology of the Mishewawa Lake area, District of Algoma. Ontario Geological Survey Open File Report 5532. 167 pp. 15 figs. 6 tables. 20 pls. 4 maps.
Date
Source Microsyenite dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 1
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/47924583066 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 December 2019

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current01:36, 6 December 2019Thumbnail for version as of 01:36, 6 December 20193,954 × 2,843 (7.93 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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