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| Main Authors: | , , , |
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
1993
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| Online Access: | https://doi.org/10.1594/PANGAEA.759572 |
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| _version_ | 1867170913002192896 |
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| author | Banakar, Virupaxa K Nair, R R Tarkian, M Haake, Birgit |
| author_facet | Banakar, Virupaxa K Nair, R R Tarkian, M Haake, Birgit |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | A detailed study of a nodule from the Somali Basin dated by 230Thexcess was correlated with the paleoceanographic events recorded in Site 236 (Leg 24) Deep Sea Drilling Project (DSDP) cores. Tentative indications are that the phase of nodule accretion starting with the development of pillar structure at a depth of 20 mm in the nodule around 13 Ma coincides with increased Antarctic Bottom Water (AABW) flow and an elevated calciumcarbonate compensation depth (CCD). The Late Miocene lowering of the CCD is represented by the mottled zones between 8 and 18 mm in the nodule is characterised by an abundant silicate component (>20%) of aeolian origin. The Miocene/Pliocene boundary (5 Ma) occurs at a depth of about 8 mm and is represented by the development of pillar structure and a minimum of aeolian dust (10.3%). The increased biological productivity of the Somali surface water since the Middle Miocene is demonstrated by the increasing Corg content of the nodule (from 0.11 to 0.19%) towards its surface. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_759572 |
| institution | PANGAEA |
| language | en |
| publishDate | 1993 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Compositional variation with depth in a nodule of sediment sample RVG-10D Banakar, Virupaxa K Nair, R R Tarkian, M Haake, Birgit Carbon, organic, total; Cobalt; Copper; DISTANCE; Element analyser AAS, graphite furnace, Perkin-Elmer 5000; Element analyser CHN, Carlo Erba EA1500; FFGR; Free-fall grab; Insoluble residue; Iron; Iron/Manganese ratio; Manganese; Maximum; Minimum; Nickel; Quartz; RVG-10D; Somalia Basin A detailed study of a nodule from the Somali Basin dated by 230Thexcess was correlated with the paleoceanographic events recorded in Site 236 (Leg 24) Deep Sea Drilling Project (DSDP) cores. Tentative indications are that the phase of nodule accretion starting with the development of pillar structure at a depth of 20 mm in the nodule around 13 Ma coincides with increased Antarctic Bottom Water (AABW) flow and an elevated calciumcarbonate compensation depth (CCD). The Late Miocene lowering of the CCD is represented by the mottled zones between 8 and 18 mm in the nodule is characterised by an abundant silicate component (>20%) of aeolian origin. The Miocene/Pliocene boundary (5 Ma) occurs at a depth of about 8 mm and is represented by the development of pillar structure and a minimum of aeolian dust (10.3%). The increased biological productivity of the Somali surface water since the Middle Miocene is demonstrated by the increasing Corg content of the nodule (from 0.11 to 0.19%) towards its surface. |
| title | (Table 1) Compositional variation with depth in a nodule of sediment sample RVG-10D |
| topic | Carbon, organic, total; Cobalt; Copper; DISTANCE; Element analyser AAS, graphite furnace, Perkin-Elmer 5000; Element analyser CHN, Carlo Erba EA1500; FFGR; Free-fall grab; Insoluble residue; Iron; Iron/Manganese ratio; Manganese; Maximum; Minimum; Nickel; Quartz; RVG-10D; Somalia Basin |
| url | https://doi.org/10.1594/PANGAEA.759572 |