@article{fdi:010062242,
  title = {{R}edox conditions in a coastal zone of the {H}umboldt system ({M}ejillones, 23 degrees {S}). {I}nfluence on the preservation of redox-sensitive metals},
  author = {{V}aldes, {J}. and {S}ifeddine, {A}bdelfettah and {B}oussafir, {M}. and {O}rtlieb, {L}uc},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he distribution of, {C}o, {M}o, {Z}n, {N}i, {C}d, {U}, {C}u, {M}n, {V}, {A}l, {F}e, {T}i, {T}otal {O}rganic {C}arbon ({TOC}) and {T}otal {S}ulfur ({TS}) was studied in surface sediments accumulated at the upper limit of the oxygen minimum zone in the northern {H}umboldt {C}urrent ({M}ejillones {B}ay), using samples taken during two cruises in {M}ay 2002 and {O}ctober 2004. {T}he time series of dissolved oxygen revealed a seasonal fluctuation of the upper limit of the oxygen minimum zone into the bay. {S}imilar bathymetric distribution curves of the metals measured in the two studied periods in the {OMZ} off northern {C}hile suggest that the factors responsible for this distribution are persistent over time. {A}uthigenic metal content was calculated using lithogenic background by determining {M}etal/{A}l ratio from local aeolian dust, instead of average shale values, which are classically used for background correction. {T}his more precise assessment allows examination of the source-sink relation of each metal in this coastal zone. {M}o preserved in the bottom sediments originates from seawater and accumulates via particulate shuttle, whereas {C}d is pre-concentrated in biodetritus. {N}i, {M}n, {V} and {F}e show a combined behavior. {S}ulfate reduction is not the most important mechanism affecting metal accumulation in {M}ejillones {B}ay, probably due to the presence of {T}hioploca, which inhibits the pyrite formation and the metal-sulfide reaction. {W}e propose the use of the authigenic {M}o/{U} ratio and a preliminary statistical model to reconstruct the levels of paleoxygenation in the subsurface waters of {M}ejillones {B}ay, by analyzing the same metals measured throughout the sedimentary sequences (and using the same statistical procedure), at least to identify extreme variations of the {OMZ} in this bay of northern {C}hile.},
  keywords = {{R}edox sensitive metals ; {O}xygen minimum zone ; {H}umboldt {C}urrent ; {M}ejillones {B}ay ; {C}hile ; {CHILI}},
  booktitle = {},
  journal = {{J}ournal of {G}eochemical {E}xploration},
  volume = {140},
  numero = {},
  pages = {1--10},
  ISSN = {0375-6742},
  year = {2014},
  DOI = {10.1016/j.gexplo.2014.01.002},
  URL = {https://www.documentation.ird.fr/hor/fdi:010062242},
}