Microfossils and chemical elements in bottom sediments of the Ashadze-1 Hydrothermal Field (tropical Mid-Atlantic Ridge), supplement to: Gablina, I F; Demina, Lyudmila L; Dmitrenko, Olga B; Os'kina, Natalia S; Popova, E A; Khusid, Tatyana A; Shilov, V V (2011): Composition and secondary alterations of microfossils in sediments of the Ashadze-1 Hydrothermal Field (tropical Mid-Atlantic Ridge). Translated from Okeanologiya, 2011, 51(3), 505-520, Oceanology, 51(3), 476-490

DOI

The first thorough analysis of microfossils from ore-bearing sediments of the Ashadze-1 Hydrothermal Field in the Mid-Atlantic Ridge sampled during Cruise 26 of R/V Professor Logachev in 2005 revealed substantial influence of hydrothermal processes on preservation of planktonic calcareous organisms as well as on preservation and composition of benthic foraminifera. From lateral and vertical distribution patterns and secondary alterations of microfossils it is inferred that the main phase of hydrothermal mineralization occurred in Holocene. Heavy metals (Cu, Co, Cr, and Ag) were accumulated by foraminiferal tests and in their enveloping Fe-Mn crusts. Distribution of authigenic minerals replacing foraminiferal tests demonstrates local zoning related to hydrothermal activity. There are three mineral-geochemical zones defined: sulfide zone, zone with elevated Mg content, and zone of Fe-Mn crusts.

Identifier
DOI http://dx.doi.org/doi:10.1594/PANGAEA.785138
Metadata Access http://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite3&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.785138
Provenance
Creator Shilov, V V;Dmitrenko, Olga B;Gablina, I F;Os'kina, Natalia S;Demina, Lyudmila L;Khusid, Tatyana A;Popova, E A
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2011
Rights Creative Commons Attribution 3.0 Unported (CC-BY)
Representation
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Coverage
Discipline Earth System Research
Spatial Coverage (13N-13N,45W-45E)