Mineralogical, geochemical, and lipid biomarker study of cabonate precipitates at station GeoB9908-1
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| Autores principales: | , , , , , , |
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
2009
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| _version_ | 1867169501407084544 |
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| author | Bahr, André Pape, Thomas Bohrmann, Gerhard Mazzini, Adriano Haeckel, Matthias Reitz, Anja Ivanov, Michael |
| author_facet | Bahr, André Pape, Thomas Bohrmann, Gerhard Mazzini, Adriano Haeckel, Matthias Reitz, Anja Ivanov, Michael |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Carbonate precipitates recovered from 2,000 m water depth at the Dolgovskoy Mound (Shatsky Ridge, north eastern Black Sea) were studied using mineralogical, geochemical and lipid biomarker analyses. The carbonates differ in shape from simple pavements to cavernous structures with thick microbial mats attached to their lower side and within cavities. Low d13C values measured on carbonates (-41 to -32 per mill V-PDB) and extracted lipid biomarkers indicate that anaerobic oxidation of methane (AOM) played a crucial role in precipitating these carbonates. The internal structure of the carbonates is dominated by finely laminated coccolith ooze and homogeneous clay layers, both cemented by micritic high-magnesium calcite (HMC), and pure, botryoidal, yellowish low-magnesium calcite (LMC) grown in direct contact to microbial mats. d18O measurements suggest that the authigenic HMC precipitated in equilibrium with the Black Sea bottom water while the yellowish LMC rims have been growing in slightly 18O-depleted interstitial water. Although precipitated under significantly different environmental conditions, especially with respect to methane availability, all analysed carbonate samples show lipid patterns that are typical for ANME-1 dominated AOM consortia, in the case of the HMC samples with significant contributions of allochthonous components of marine and terrestrial origin, reflecting the hemipelagic nature of the primary sediment. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_743257 |
| institution | PANGAEA |
| language | en |
| publishDate | 2009 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Mineralogical, geochemical, and lipid biomarker study of cabonate precipitates at station GeoB9908-1 Bahr, André Pape, Thomas Bohrmann, Gerhard Mazzini, Adriano Haeckel, Matthias Reitz, Anja Ivanov, Michael BS346GR; Center for Marine Environmental Sciences; Dolgovskoy mound; GeoB9908-1; MARUM; Professor Logachev; Television-Grab; TTR-15; TVG Carbonate precipitates recovered from 2,000 m water depth at the Dolgovskoy Mound (Shatsky Ridge, north eastern Black Sea) were studied using mineralogical, geochemical and lipid biomarker analyses. The carbonates differ in shape from simple pavements to cavernous structures with thick microbial mats attached to their lower side and within cavities. Low d13C values measured on carbonates (-41 to -32 per mill V-PDB) and extracted lipid biomarkers indicate that anaerobic oxidation of methane (AOM) played a crucial role in precipitating these carbonates. The internal structure of the carbonates is dominated by finely laminated coccolith ooze and homogeneous clay layers, both cemented by micritic high-magnesium calcite (HMC), and pure, botryoidal, yellowish low-magnesium calcite (LMC) grown in direct contact to microbial mats. d18O measurements suggest that the authigenic HMC precipitated in equilibrium with the Black Sea bottom water while the yellowish LMC rims have been growing in slightly 18O-depleted interstitial water. Although precipitated under significantly different environmental conditions, especially with respect to methane availability, all analysed carbonate samples show lipid patterns that are typical for ANME-1 dominated AOM consortia, in the case of the HMC samples with significant contributions of allochthonous components of marine and terrestrial origin, reflecting the hemipelagic nature of the primary sediment. |
| title | Mineralogical, geochemical, and lipid biomarker study of cabonate precipitates at station GeoB9908-1 |
| topic | BS346GR; Center for Marine Environmental Sciences; Dolgovskoy mound; GeoB9908-1; MARUM; Professor Logachev; Television-Grab; TTR-15; TVG |
| url | https://doi.org/10.1594/PANGAEA.743257 |