(Table 2) Major and trace elements in black smoker particulates


We present geochemical data of black smoker particulates filtered from hydrothermal fluids with seawater-dilutions ranging from 0–99%. Results indicate the dominance of sulphide minerals (Fe, Cu, and Zn sulphides) in all samples taken at different hydrothermal sites on the Mid-Atlantic Ridge. Pronounced differences in the geochemistry of the particles between Logatchev I and 5°S hydrothermal fields could be attributed to differences in fluid chemistry. Lower metal/sulphur ratios (Me/H2S < 1) compared to Logatchev I result in a larger amount of particles precipitated per liter fluid and the occurrence of elemental sulphur at 5°S, while at Logatchev I Fe oxides occur in larger amounts. Systematic trends with dilution degree of the fluid include the precipitation of large amounts of Cu sulphides at a low dilution and a pronounced drop with increasing dilution. Moreover, Fe (sulphides or oxides) precipitation increases with dilution of the vent fluid by seawater. Geochemical reaction path modeling of hydrothermal fluid–seawater mixing and conductive cooling indicates that Cu sulphide formation at Logatchev I and 5°S mainly occurs at high temperatures and low dilution of the hydrothermal fluid by seawater. Iron precipitation is enhanced at higher fluid dilution, and the different amounts of minerals forming at 5°S and Logatchev I are thermodynamically controlled. Larger total amounts of minerals and larger amounts of sulphide precipitate during the mixing path when compared to the cooling path. Differences between model and field observations do occur and are attributable to closed system modeling, to kinetic influences and possibly to organic constituents of the hydrothermal fluids not accounted for by the model.

= approximately equal

Supplement to: Klevenz, Verena; Bach, Wolfgang; Schmidt, Katja; Hentscher, Michael; Koschinsky, Andrea; Petersen, Sven (2011): Geochemistry of vent fluid particles formed during initial hydrothermal fluid-seawater mixing along the Mid-Atlantic Ridge. Geochemistry, Geophysics, Geosystems, 12, Q0AE05

DOI https://doi.org/10.1594/PANGAEA.772620
Related Identifier IsSupplementTo https://doi.org/10.1029/2011GC003704
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.772620
Creator Klevenz, Verena; Bach, Wolfgang ORCID logo; Schmidt, Katja ORCID logo; Hentscher, Michael; Koschinsky, Andrea ORCID logo; Petersen, Sven (ORCID: 0000-0002-5469-105X)
Publisher PANGAEA
Publication Year 2011
Funding Reference German Research Foundation https://doi.org/10.13039/501100001659 Crossref Funder ID 5471797 https://gepris.dfg.de/gepris/projekt/5471797 From Mantle to Ocean: Energy-, Material- and Life-cycles at Spreading Axes
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 936 data points
Discipline Earth System Research
Spatial Coverage (-44.981W, -4.811S, -12.371E, 17.751N); Mid-Atlantic Ridge at 10-15°N; Mid-Atlantic Ridge at 4-11°S; tropical/subtropical North Atlantic
Temporal Coverage Begin 2006-05-10T14:24:00Z
Temporal Coverage End 2009-04-23T14:29:00Z