Jaspilite banded iron formation (Saksaganskaya Suite, Paleoproterozoic; Krivoy Rog Belt, Ukraine) 3 : 無料・フリー素材/写真
Jaspilite banded iron formation (Saksaganskaya Suite, Paleoproterozoic; Krivoy Rog Belt, Ukraine) 3 / 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 | Jaspilite banded iron formation from the Precambrian of Ukraine.Banded iron formations, or BIFs, are unusual, dense sedimentary rocks consisting of alternating layers of iron-rich oxides and iron-rich silicates. Most BIFs are Proterozoic in age (although some are Late Archean), and do not form today - they're “extinct”! Many specific varieties of iron formation are known, and some are given special rock names. For example, jaspilite is an attractive reddish & silvery gray banded rock consisting of hematite, red chert (“jasper”), and specular hematite or magnetite. Because of their age, most BIFs have been around long enough to have been subjected to one or more orogenic (mountain-building) events. As such, most BIFs are folded and/or metamorphosed to varying degrees. BIFs are known from around the world, but some of the most famous & extensive BIF deposits are found in the vicinity of North America’s Lake Superior Basin. Many BIFs have economic concentrations of iron and are mined. BIFs are the most important variety of iron ore on Earth.The jaspilite sample seen here is a meta-BIF from Urkaine's Krivoy Rog Belt, which is mined for iron ores. The name is also transliterated as "Kryvyi Rih", "Kriviy Rig", and "Krivoi Rog".Stratigraphy: Saksaganskaya Suite, Krivoy Rog Supergroup (Krivoy Rog Series), PaleoproterozoicLocality: mine in the Krivoy Rog Belt, Ukrainian Shield, Ukraine-----------------------------------Some info. from:Sośnicka et al. (2015) - Fluid types and their genetic meaning for the BIF-hosted iron ores, Krivoy Rog, Ukraine. Ore Geology Reviews 68: 171-194. |
| 撮影日 | 2023-12-30 04:14:34 |
| 撮影者 | James St. John |
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