File:Lamprophyre (Dubreuilville Dike, Archean; Route 17 roadcut southeast of Princess Lake & north of Wawa, Ontario, Canada) 1 (48296736436).jpg
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[edit]DescriptionLamprophyre (Dubreuilville Dike, Archean; Route 17 roadcut southeast of Princess Lake & north of Wawa, Ontario, Canada) 1 (48296736436).jpg |
Lamprophyre in the Precambrian of Ontario, Canada. This is part of an igneous dike composed of a rare igneous rock called lamprophyre. Such rocks are ultrapotassic, mafic to ultramafic, intrusive igneous rocks. This one is a gray hornblende lamprophyre with altered mantle xenoliths (see elsewhere in this photostream; "xeno" = foreign; "lith" = rock). Xenoliths are pieces of rock that have fallen from the walls or roof of a cooling magma chamber. The examples at this locality are composed of talc and acicular/bladed actinolite. Description from Wilson (2006): This dike may be the one described by Higgins (1986). He reported that the dike consists of 60% euhedral amphibole, 20% biotite replacing amphibole and 15% plagioclase. Minor sphene and opaque minerals are present. Geologic unit and age: Dubreuilville Dike, Archean Locality: Route 17 roadcut, south of the Route 519-Route 17 intersection, southeast of Princess Lake & north of the town of Wawa, Ontario, southeastern Canada (48° 15' 12.05" North latitude, 84° 52' 59.72" West longitude) See info. at: <a href="https://en.wikipedia.org/wiki/Lamprophyre" rel="noreferrer nofollow">en.wikipedia.org/wiki/Lamprophyre</a> References cited: Higgins (1986) - Nodule-bearing spessartite (lamprophyre) dike near Wawa, northern Ontario. GAC-MAC-GCU-AGC-AMC-UCG Program with Abstracts 11: 81. Wilson (2006) - Unusual diamond-bearing rocks of the Wawa area. Institute on Lake Superior Geology, 52nd Annual Meeting, Sault Ste. Marie, Ontario 52(3). |
Date | |
Source | Lamprophyre (Dubreuilville Dike, Archean; Route 17 roadcut southeast of Princess Lake & north 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@N05/48296736436 (archive). It was reviewed on 5 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
5 December 2019
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current | 05:57, 5 December 2019 | ![]() | 4,288 × 2,848 (10.26 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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File change date and time | 03:00, 16 July 2019 |
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Date and time of digitizing | 09:45, 14 July 2012 |
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Date metadata was last modified | 23:00, 15 July 2019 |
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