Calc-silicate clast with reaction rim in marble (Gouverneur Marble, Mesoproterozoic, ~1.1 Ga; Route 11 roadcut north of Antwerp, New York State, USA) 11 : 無料・フリー素材/写真
Calc-silicate clast with reaction rim in marble (Gouverneur Marble, Mesoproterozoic, ~1.1 Ga; Route 11 roadcut north of Antwerp, New York State, USA) 11 / 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 | Marble in the Precambrian of New York State, USA.Marble is a crystalline-textured metamorphic rock composed of calcite (CaCO3 - calcium carbonate). It bubbles in acid and does not scratch glass. Marble forms by the metamorphism of limestone, a common biogenic sedimentary rock.The outcrop seen here is composed of whitish marble (mosty banded) that is graphitic and phlogopitic. Some incorporated calc-silicate rock clasts having reaction rims are present (= dark mass in the picture). A portion of the outcrop consists of dolomitized marble (not dolomitic marble), where the host marble was locally dolomitized by injection of hot, magnesium-bearing fluids along a fracture. This resulted in the formation of a dike-like zone of light brown dolomitized marble, but it's not a dike.The rocks here are part of the Gouverneur Marble of New York State's Adirondack Lowlands. The original limestones were metamorphosed at about 1.1 billion years ago, during the Grenville Orogeny.Stratigraphy: Gouverneur Marble, Oswegatchie Group, Mesoproterozoic, ~1.1 Ga metamorphic ageLocality: Antwerp North Outcrop - roadcut on the southeastern side of Route 11, north of the town of Antwerp, Adirondack Lowlands, northern New York State, USA (44° 14’ 05.50” North latitude, 75° 36’ 01.83” West longitude) |
| 撮影日 | 2012-05-11 09:17:06 |
| 撮影者 | James St. John |
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