Hydrothermal veins & altered Butte Quartz Monzonite (Interstate 15 roadcut east of Butte, Montana, USA) 50 : 無料・フリー素材/写真
Hydrothermal veins & altered Butte Quartz Monzonite (Interstate 15 roadcut east of Butte, Montana, USA) 50 / 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 | The town of Butte, Montana is known as the “Richest Hill on Earth” and “The Mining City”. The Butte Mining District has produced gold, silver, copper, molybdenum, manganese, and other metals.The area's bedrock consists of the Butte Quartz Monzonite (a.k.a. Butte Pluton), which is part of the Boulder Batholith. The Butte Quartz Monzonite (“BQM”) formed 76.3 million years ago, during the mid-Campanian Stage in the Late Cretaceous. BQM rocks have been intruded and altered by hydrothermal veins containing valuable metallic minerals - principally copper sulfides. The copper mineralization has been dated to 62-66 million years ago, during the latest Maastrichtian Stage (latest Cretaceous) and Danian Stage (Early Paleocene). In the supergene enrichment zone of the area, the original sulfide mineralogy has been altered.Seen here is an outcrop of hydrothermal veins and altered BQM host rocks. The coloration is from iron oxide staining.Locality: roadcut along Interstate 15, ~east of the town of Butte, Montana, USA (46° 01’ 15.07" North latitude, 112° 27' 37.49" West longitude) |
| 撮影日 | 2010-08-11 11:52:19 |
| 撮影者 | James St. John |
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