Gorshkov, Anatoly I; Sval'nov, Vyacheslav N; Sivtsov, Alexander V; Ivlev, Pavel A; Uspenskaya, Tatyana Y (1996): Composition of micronodules and host sediments from the Guatemala Basin [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.759826, Supplement to: Gorshkov, AI et al. (1996): Mineralogy of manganese micronodules from the Guatemala Basin. Translated from Okeanologiya, 1996, 36(1), 112-118, Oceanology, 36(1), 102-108
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Abstract:
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.
Project(s):
Archive of Ocean Data (ARCOD)
Coverage:
Median Latitude: 8.215051 * Median Longitude: -93.715610 * South-bound Latitude: 5.366700 * West-bound Longitude: -96.433300 * North-bound Latitude: 11.566700 * East-bound Longitude: -91.355000
Event(s):
DM41-3851 * Latitude: 6.616667 * Longitude: -93.356667 * Elevation: -3650.0 m * Location: Guatemala Basin * Campaign: DM41 * Basis: Dmitry Mendeleev * Method/Device: Ocean-50 grab (GRAB50)
DM41-3857 * Latitude: 6.533200 * Longitude: -91.465000 * Elevation: -3710.0 m * Campaign: DM41 * Basis: Dmitry Mendeleev * Method/Device: Okean Grab (OKEAN)
DM41-3861 * Latitude: 5.888000 * Longitude: -93.112000 * Elevation: -3710.0 m * Campaign: DM41 * Basis: Dmitry Mendeleev * Method/Device: Okean Grab (OKEAN)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Gorshkov, AI; Sval'nov, VN; Sivtsov, AV et al. (1996): (Table 1) Abundance of micronodules and composition of host sediments from the Guatemala Basin. https://doi.org/10.1594/PANGAEA.759823
- Gorshkov, AI; Sval'nov, VN; Sivtsov, AV et al. (1996): (Table 2) Mineral compositions of surface and buried micronodules from the Guatemala Basin. https://doi.org/10.1594/PANGAEA.759824