File:Chondroditic tactite (chondroditic dolomite skarn) (York River Skarn, Proterozoic; eastern side of the York River, just north of Highway 28, Bancroft District, Ontario, Canada).jpg

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English: Chondroditic tactite from the Proterozoic of Ontario, Canada. (6.2 centimeters across along the base)

Tactites are a type of skarn. They are multimineralic carbonate rocks resulting from contact metamorphism (alteration of country rocks by the heat of an igneous intrusion) and metasomatism (addition of elements to country rocks from magmatic or hydrothermal fluids).

The tactite shown here is from a classic locality along the York River near Bancroft, Ontario, Canada. This is a dolomitic marble having dolomite (whitish-grayish, CaMg(CO3)2), chondrodite (small orangish-brown chunks, Mg5(SiO4)2F2), muscovite mica, pyrite, and 1 or 2 undetermined black minerals (probably including ferroan spinel).

Geologic unit & age: York River Skarn (a.k.a. York River Tactite Zone), late Mesoproterozoic or Neoproterozoic

Locality: eastern side of York River, ~0.3 km north of Highway 28 (Highway 500), Dungannon Township, Bancroft District, Hastings County, southern Ontario, southeastern Canada (45º 04’ 08” North, 77º 43’ 57” West).
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Source https://www.flickr.com/photos/47445767@N05/15645114352/
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@N05/15645114352 (archive). It was reviewed on 2 March 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

2 March 2020

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