Radioactive quartz-pebble conglomerate (Matinenda Formation, Paleoproterozoic, ~2.3-2.48 Ga; Spine Road outcrop, Elliot Lake, Ontario, Canada) 44 : 無料・フリー素材/写真
Radioactive quartz-pebble conglomerate (Matinenda Formation, Paleoproterozoic, ~2.3-2.48 Ga; Spine Road outcrop, Elliot Lake, Ontario, Canada) 44 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Conglomerate in the Precambrian of Ontario, Canada.This is an outcrop of radioactive, 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 GaLocality: 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. |
| 撮影日 | 2012-07-16 14:44:45 |
| 撮影者 | James St. John |
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