| Автор | Kassens, H. |
| Автор | Sarnthein, M. |
| Дата выпуска | 1989 |
| dc.description | Near‐surface sediments from the equatorial east Atlantic and the Norwegian Sea exhibit pronounced shear strength maxima in profiles from the peak Holocene and Pleistocene. These semi‐indurated layers start to occur at 8–102 cm below the sediment surface and can be explained neither by the modal composition nor by the effective overburden pressure of the sediments. However, scanning electron microscope and microprobe data exhibit micritic crusts and crystal carpets, which are clearly restricted to (undisturbed) samples from indurated layers and form a manifest explanation for their origin. The minerals precipitated comprise calcite, aragonite, and in samples more proximal to the African continent SiO<sub>2</sub> needles, and needles of as yet unidentified K‐Mg‐Fe‐Al silicates, crusts of which dominate the indurated layers in the Norwegian Sea. By their stratigraphic position in deep‐sea sediments the carbonate‐based shear strength maxima are tentatively ascribed to dissolved adjacent pteropod layers from the early Holocene and hence to short‐lived no‐analogue events of early diagenesis. Possibly, they have been controlled by a reduced organic carbon flux, leading to increased aragonite preservation in the deep sea. |
| Формат | application.pdf |
| Копирайт | Copyright 1989 by the American Geophysical Union. |
| Тема | MARINE GEOLOGY AND GEOPHYSICS |
| Тема | General or miscellaneous |
| Тема | OCEANOGRAPHY: GENERAL |
| Тема | 4267 |
| Тема | General or miscellaneous |
| Тема | INFORMATION RELATED TO GEOLOGIC TIME |
| Тема | Cenozoic |
| Название | A link between paleoceanography, early diagenetic cementation, and shear strength maxima in Late Quaternary deep‐sea sediments? |
| Тип | article |
| DOI | 10.1029/PA004i003p00253 |
| Electronic ISSN | 1944-9186 |
| Print ISSN | 0883-8305 |
| Журнал | Paleoceanography |
| Том | 4 |
| Первая страница | 253 |
| Последняя страница | 269 |
| Выпуск | 3 |
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