Phosphatized calcareous conglomerate from the Kara Sea floor
| Autor: | V. T. Dubinchuk, N. S. Oskina, Alexander N Novigatsky, B. G. Pokrovsky, G. N. Baturin, O. B. Dmitrenko |
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| Rok vydání: | 2016 |
| Předmět: |
Calcite
010504 meteorology & atmospheric sciences Mineralogy chemistry.chemical_element Plankton 010502 geochemistry & geophysics Oceanography 01 natural sciences Diagenesis Conglomerate chemistry.chemical_compound chemistry Benthic zone Carbonate rock Calcareous Carbon Geology 0105 earth and related environmental sciences |
| Zdroj: | Oceanology. 56:690-701 |
| ISSN: | 1531-8508 0001-4370 |
| DOI: | 10.1134/s0001437016050027 |
| Popis: | Trawling of the bottom in the northeastern Kara Sea during cruise 125 of the R/V Professor Shtokman in 2013 recovered a block of cavernous, partly phosphatized carbonate rock consisting of biogenic carbonate material and partly crystallized diagenetic calcite. The fauna remains are mainly Oligocene–Pliocene planktonic and benthic foraminifers, with less common Oligocene–Miocene coccoliths and single wormlike organisms. Part of the phosphatized material in caverns is impregnated by manganese and iron oxides and enriched in heavy and trace metals. According to the oxygen isotopic composition, this rock formed under moderate temperature conditions. In terms of morphology, mineralogy, and the abundance of organic remains, the block is comparable to methanogenic carbonates found in other parts of the ocean, but shows no isotopically light carbon signatures typical of methane activity. This indicates the diversity of the carbon isotope composition of the Arctic carbonates. |
| Databáze: | OpenAIRE |
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