File:Строматолиты 17 Vera Kochina.jpg
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Русский: Строматолиты, слоистые отложения, в основном из известняка, образованные в результате роста сине-зеленых водорослей (примитивных одноклеточных организмов). Эти структуры обычно характеризуются тонкими чередующимися светлыми и темными слоями, которые могут быть плоскими, бугристыми или куполообразными. Чередующиеся слои в значительной степени образуются в результате улавливания отложений, вымытых во время штормов в одних случаях, и в результате осаждения известняка сине-зелеными водорослями в других.
Строматолиты были распространены в докембрийское время (т. е. более 542 млн лет назад). Некоторые из первых форм жизни на Земле зарегистрированы в строматолитах, присутствующих в горных породах возрастом 3,5 миллиарда лет. Хотя строматолиты продолжают формироваться в некоторых районах мира и сегодня, в наибольшем изобилии они растут в заливе Шарк в западной Австралии. Матовый слой сине-зеленых водорослей может расти на поверхности отложений на мелководье, потому что испарение вызывает высокие концентрации соли, которые препятствуют поеданию сине-зелеными водорослями улитками и другими организмами (https://www.britannica.com/science/stromatolite ). Место съёмки: Анабарское плато (плато Анабар), реки Джогджо и Котуйкан. Плато Анабар Центрально-Сибирского плоскогорья – одно из древнейших сооружений на Земле, возраст пород которого превышает 3 миллиарда лет. В центральной части он сложен архейскими кристаллическими сланцами и гнейсами. По периферии плато преобладают протерозойские и нижнепалеозойские известняки. Анабарское плато географически совпадает с Анабарским щитом – геологической областью, представляющей собой обнажившееся основание Сибирской платформы. Вместе с Алданским щитом дальше на юго-восток Анабарский щит является одной из главных особенностей платформы.English: Stromatolite, layered deposit, mainly of limestone, formed by the growth of blue-green algae (primitive one-celled organisms). These structures are usually characterized by thin, alternating light and dark layers that may be flat, hummocky, or dome-shaped. The alternating layers are largely produced by the trapping of sediment washed up during storms on some occasions and by limestone precipitation by the blue-green algae on others.
{{en%7CStromatolite, layered deposit, mainly of limestone, formed by the growth of blue-green algae (primitive one-celled organisms). These structures are usually characterized by thin, alternating light and dark layers that may be flat, hummocky, or dome-shaped. The alternating layers are largely produced by the trapping of sediment washed up during storms on some occasions and by limestone precipitation by the blue-green algae on others. Stromatolites were common in Precambrian time (i.e., more than 542 million years ago). Some of the first forms of life on Earth are recorded in stromatolites present in rocks 3.5 billion years old. Although stromatolites continue to form in certain areas of the world today, they grow in greatest abundance in Shark Bay in western Australia. A matlike layer of blue-green algae is able to grow on the surface of sediments in the shallow waters there because evaporation causes high concentrations of salt that discourage snails and other organisms from eating the blue-green algae (https://www.britannica.com/science/stromatolite ) Location: Anabar Plateau, rivers Jogdgo and Kotyikan The Anabar Plateau of the Central Siberian Plateau is one of the oldest structures on Earth, with rocks that are more than 3 billion years old. In its central region it is composed of Archean crystalline schists and gneisses. Along the periphery of the plateau Proterozoic and Lower Paleozoic limestones predominate. The Anabar Plateau coincides geographically with the Anabar Shield, a geological region that is an exposed basement of the Siberian Craton. Together with the Aldan Shield further to the southeast, the Anabar Shield is one of the main features of the craton (https://en.wikipedia.org/wiki/Anabar_Plateau)}}Stromatolites were common in Precambrian time (i.e., more than 542 million years ago). Some of the first forms of life on Earth are recorded in stromatolites present in rocks 3.5 billion years old. Although stromatolites continue to form in certain areas of the world today, they grow in greatest abundance in Shark Bay in western Australia. A matlike layer of blue-green algae is able to grow on the surface of sediments in the shallow waters there because evaporation causes high concentrations of salt that discourage snails and other organisms from eating the blue-green algae (https://www.britannica.com/science/stromatolite ) Location: Anabar Plateau, rivers Jogdgo and Kotyikan The Anabar Plateau of the Central Siberian Plateau is one of the oldest structures on Earth, with rocks that are more than 3 billion years old. In its central region it is composed of Archean crystalline schists and gneisses. Along the periphery of the plateau Proterozoic and Lower Paleozoic limestones predominate. The Anabar Plateau coincides geographically with the Anabar Shield, a geological region that is an exposed basement of the Siberian Craton. Together with the Aldan Shield further to the southeast, the Anabar Shield is one of the main features of the craton (https://en.wikipedia.org/wiki/Anabar_Plateau) |
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| Source | Own work |
| Author | Vera Kochina |
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This image was uploaded as part of Russian Science Photo Competition 2022.
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