Metabentonite in silicate-rich marble (Gouverneur Marble, Mesoproterozoic, ~1.1 Ga; Route 11 roadcut southwest of Canton, New York State, USA) 34 : 無料・フリー素材/写真
Metabentonite in silicate-rich marble (Gouverneur Marble, Mesoproterozoic, ~1.1 Ga; Route 11 roadcut southwest of Canton, New York State, USA) 34 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | Metabentonite in the Precambrian of New York State, USA.The outcrop seen here is composed of highly impure marbles called "calc-silicate rocks", a truly horrid term that's even worse that the icky lithology terms "tufa" and "hornfels". (Wow.) The prominent band has been interpreted as a metamorphosed volcanic ash bed (= metabentonite) - the horizon is now dominated by microcline feldspar. A reaction zone between the metabentonite and the host rocks has diopside pyroxene, sphene/titanite, phlogopite mica, pyrite, actinolite amphibole, tourmaline, and minor quartz.The rocks 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: The Snake Outcrop - roadcut on the northern side of Route 11, just northeast of the Route 11-O’Horo Road (= Old Rt. 11) intersection, ~4.2 miles southwest of the town of Canton, central Saint Lawrence County, Adirondack Lowlands, northern New York State, USA (44° 33’ 05.23” North latitude, 75° 13’ 29.57” West longitude) |
| 撮影日 | 2012-05-11 15:38:56 |
| 撮影者 | James St. John |
| タグ | |
| 撮影地 |