File:Radiation reading of bare rocks (Spine Road outcrop, Elliot Lake, Ontario, Canada) 2 (46806261135).jpg
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I'm holding a Geiger counter next to a bare surface of radioactive rocks in the town of Elliot Lake, Ontario. The radiation reading reached over 0.3 milliroentgens per hour. The rocks are uraniferous, pyritic, K-feldspar-bearing, quartz-pebble conglomerates of the Matinenda Formation. The unit dates to about 2.3 to 2.48 billion years old. Detrital zircons in the Matinenda Formation range in age from >2.6 Ga to >2.8 Ga. The rocks here range from quartz-pebble conglomerates to pebbly sandstones to apparent granulestones. K-feldspar granules are visible, as are detrital pyrite sand grains and black specks of apparently detrital uraninite (UO2 - uranium dioxide sand grains). The sediments were deposited in an ancient braided river system. Geiger counter-wise, these rocks are "hot" (= radioactive). Iron oxide-coated joint surfaces are hotter - they have concentrations of remobilized uranium minerals. Some chunks of yellowish-colored, secondary uranium minerals are present at the site. Stratigraphy: Matinenda Formation, Elliot Lake Group, Huronian Supergroup, Paleoproterozoic, ~2.3 to 2.48 Ga Locality: Spine Road Outcrop - roadcut on the northern side of the western end of Spine Road, due east of Hector Lake, western side of town of Elliot Lake, Ontario, southeastern Canada (46° 22’ 59.60” North latitude, 82° 41’ 02.99” West longitude) Some info. from: Easton (2011) - Detrital zircon geochronology of the uraniferous Paleoproterozoic Matinenda Formation (Huronian Supergroup), Elliot Lake, Ontario. Geological Society of America Abstracts with Programs 43(5): 41. |
| Date | |
| Source | Radiation reading of bare rocks (Spine Road outcrop, Elliot Lake, Ontario, Canada) 2 |
| 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@N05/46806261135 (archive). It was reviewed on 22 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 06:01, 22 October 2019 | | 4,000 × 3,000 (4.09 MB) | Rudolphous (talk | contribs) | Transferred from Flickr via #flickr2commons |
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