Unknown
PANGAEA
In:
Supplement to: Cortelezzi, CR; Espósito, G; Iasi, R (1984): Study of manganese nodules from the Malvinas (Falkland) Plateau, South Atlantic Ocean. In: Arndt Wauschkuhn, Cornelia Kluth & Richard A. Zimmermann (eds) Syngenesis and Epigenesis in the Formation of Mineral Deposits, Springer Berlin Heidelberg, 653 pp, 221-227, https://doi.org/10.1007/978-3-642-70074-3_21
Publication Date:
2023-08-28
Description:
Manganese nodules occurring within marine sediments of presumably Upper Miocene-Lower Pliocene age from cores obtained by the Argentine oceanographic vessel ARA Islas Orcadas in 1977 on the Malvinas (Falkland) Plateau and neighbouring Scotia Sea were studied with the aim of comparing them with other fossil nodules found on the mainland of Argentina that were also ascribed to the marine environment. After optical mineralogical, chemical, X-ray and trace element analysis, the studied "nodules" proved to be actually wacke clasts cemented by manganese oxides with a high Fe/Mn ratio corresponding to a continental environment. The studied "nodules" thus differ from the Argentine mainland nodules and are supposed to have been transported from continental environments and then deposited in the marine realms. The wacke clasts became then nuclei for the deposition of the marine manganese oxides of the coatings. The proportion of trace elements, which is high, suggests the growth of the nodules in the marine environment.
Keywords:
IO13-1477; IO13-1477.001-PC; IO13-1477.006-PC; Islas Orcadas; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; PC; Piston corer; South Atlantic Ocean
Type:
Dataset
Format:
application/zip, 2 datasets
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