Английская Википедия:Alum Shale Formation
Шаблон:About Шаблон:Infobox rockunit
The Alum Shale Formation (also known as alum schist and alum slate) is a formation of black shale of Middle Cambrian to Tremadocian (Lower Ordovician) in age found predominantly in southern Scandinavia.[1] It is shale or clay slate containing pyrite. Decomposition of pyrite by weathering forms sulfuric acid, which acts on potash and alumina constituents to form alum, which often occurs as efflorescences on the rock outcrop.
As the formation contains kerogen originated from algae, it is also classified as marinite-type oil shale. At the same time it is rich in aromatic hydrocarbon attributed to post-depositional irradiation damage to saturated hydrocarbons, induced by uranium concentration in the shale.[2] Alum shale also contains enhanced levels of radium as a result of uranium decay.[3] Between 1950 and 1989, Sweden used alum shale for the uranium production.[4]
See also
- Orsten, a lagerstätte in the Alum Shale Formation
References
Шаблон:Shale gas Шаблон:Geology of Fennoscandia
- Английская Википедия
- Geologic formations of Denmark
- Geologic formations of Norway
- Geologic formations of Sweden
- Cambrian System of Europe
- Ordovician System of Europe
- Paleozoic Denmark
- Cambrian Norway
- Ordovician Norway
- Paleozoic Sweden
- Ordovician Sweden
- Shale formations
- Oil shale geology
- Lagerstätten
- Cambrian southern paleotemperate deposits
- Ordovician southern paleotemperate deposits
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- Страницы с телепортом
- Википедия
- Статья из Википедии
- Статья из Английской Википедии
