PHOSPHATIC COLUMNAR STROMATOLITES FROM THE UPPER JURASSIC OF THE ORENBURG AREA OF THE PERIURAL REGION
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dc.contributor.author | Silant'yev V.N. | |
dc.date.accessioned | 2020-10-08T10:25:17Z | |
dc.date.available | 2020-10-08T10:25:17Z | |
dc.date.issued | 1989 | |
dc.identifier | https://elibrary.ru/item.asp?id=31093278 | |
dc.identifier.citation | Transactions (Doklady) of the USSR Academy of Sciences. Earth Science Sections, 1989, , 5, 111-113 | |
dc.identifier.issn | 0891-5571 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/17787 | |
dc.description.abstract | Jurassic columnar stromatolites are considered to be a rarity in the world; in the USSR they have heretofore never been described. Columnar stromatolites have been found for the first time in the USSR in Late Jurassic (Oxfordian-Kimmeridgian) deposits, and it turns out that their mineral basis is not carbonates (as in most known stromatolite structures), but phosphates. This, on the one hand, testifies to a far more extensive occurrence of Jurassic stromatolites than was previously though and, on the other hand, to the possibility that stromatolite-forming bacterial-algal assemblages of organisms formed not only microgranular, but also concretionary phosphorite ores. The columns are predominantly spindle-shaped, pear-shaped or subcylindrical, with no discernible branching, sometimes with swellings and constrictions, and with a rough knobby, more rarely smooth level surface; they are clearly separated from each other and from the surrounding glauconite-quartz sand. Transverse sections through the columns are round or oval. | |
dc.subject | Jurassic | en |
dc.title | PHOSPHATIC COLUMNAR STROMATOLITES FROM THE UPPER JURASSIC OF THE ORENBURG AREA OF THE PERIURAL REGION | |
dc.type | Статья | |
dc.subject.age | Mesozoic::Jurassic | en |
dc.subject.age | Мезозой::Юрская | ru |
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