Composition of micronodules and host sediments from the Guatemala Basin
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| Autori principali: | , , , , |
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
1996
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| _version_ | 1867172222114725888 |
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| author | Gorshkov, Anatoly I Sval'nov, Vyacheslav N Sivtsov, Alexander V Ivlev, Pavel A Uspenskaya, Tatyana Y |
| author_facet | Gorshkov, Anatoly I Sval'nov, Vyacheslav N Sivtsov, Alexander V Ivlev, Pavel A Uspenskaya, Tatyana Y |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | A complex of mineralogical techniques used in studies of near-surface layer hemipelagic sediments indicates that disordered todorokite and hexagonal birnessite dominate in manganese micronodules, whereas hexagonal birnessite is the main phase of micronodules from miopelagic sediments. Content of todorokite increases downward through the miopelagic sedimentary sequence; this can be reasonably explained by transformations of some other manganese minerals to todorokite. Occurrence of several manganese minerals in studied samples may reflect temporal and lateral variations in C_org content in sediments and respective local fluctuations in environmental conditions (pH, Eh, geochemical activity of Mn, etc.). Todorokite may have formed under the most anoxic conditions near the water-sediment interface. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_759826 |
| institution | PANGAEA |
| language | en |
| publishDate | 1996 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Composition of micronodules and host sediments from the Guatemala Basin Gorshkov, Anatoly I Sval'nov, Vyacheslav N Sivtsov, Alexander V Ivlev, Pavel A Uspenskaya, Tatyana Y Archive of Ocean Data; ARCOD; DM41; DM41-3851; DM41-3857; DM41-3861; DM41-3862; DM41-3864; DM41-3866; DM41-3873-4; DM41-3875; DM41-3877; DM41-3878; DM41-3885; DM41-3889; DM41-3895; DM41-3898; Dmitry Mendeleev; GC; GRAB50; Gravity corer; Guatemala Basin; Ocean-50 grab; OKEAN; Okean Grab; Pacific Ocean A complex of mineralogical techniques used in studies of near-surface layer hemipelagic sediments indicates that disordered todorokite and hexagonal birnessite dominate in manganese micronodules, whereas hexagonal birnessite is the main phase of micronodules from miopelagic sediments. Content of todorokite increases downward through the miopelagic sedimentary sequence; this can be reasonably explained by transformations of some other manganese minerals to todorokite. Occurrence of several manganese minerals in studied samples may reflect temporal and lateral variations in C_org content in sediments and respective local fluctuations in environmental conditions (pH, Eh, geochemical activity of Mn, etc.). Todorokite may have formed under the most anoxic conditions near the water-sediment interface. |
| title | Composition of micronodules and host sediments from the Guatemala Basin |
| topic | Archive of Ocean Data; ARCOD; DM41; DM41-3851; DM41-3857; DM41-3861; DM41-3862; DM41-3864; DM41-3866; DM41-3873-4; DM41-3875; DM41-3877; DM41-3878; DM41-3885; DM41-3889; DM41-3895; DM41-3898; Dmitry Mendeleev; GC; GRAB50; Gravity corer; Guatemala Basin; Ocean-50 grab; OKEAN; Okean Grab; Pacific Ocean |
| url | https://doi.org/10.1594/PANGAEA.759826 |