@article{fdi:010077894,
  title = {{C}ontrol of seasonal and inter-annual rainfall distribution on the {S}trontium-{N}eodymium isotopic compositions of suspended particulate matter and implications for tracing {ENSO} events in the {P}acific coast ({T}umbes basin, {P}eru)},
  author = {{M}oquet, {J}. {S}. and {M}orera, {S}. and {T}urcq, {B}runo and {P}oitrasson, {F}. and {R}oddaz, {M}artin and {M}oreira {T}urcq, {P}atricia and {E}spinoza, {J}. {C}. and {G}uyot, {J}ean-{L}oup and {T}akahashi, {K}. and {O}rrillo-{V}igo, {J}. and {P}etrick, {S}. and {M}ounic, {S}. and {S}ondag, {F}rancis},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he geochemistry of riverine sediments exported to the oceans is important for paleo-hydro-climatic reconstruction. {H}owever, climate reconstruction requires a good understanding of the relationship between geochemistry and hydrological variability and sediment sources. {I}n this study, we analyzed the major elements, the strontium-neodymium radiogenic isotopes signatures ({S}r-87/{S}r-86 and e{N}d) and the mineralogy of the suspended particulate matter ({SPM}) sampled monthly during two hydrologic years (2007-2008, a wet year, and 2010-2011, a normal hydrological year) upstream the {T}umbes {R}iver outlet. {T}he hydroclimate of this {E}cuador-{P}eru binational basin is particularly sensitive to {ENSO} ({E}l {N}ino {S}outhern {O}scillation) events. {W}hile mineralogy (dominated by illite) and the chemical alteration index (from 75 to 82) remain almost constant along the two hydrological years, {S}r-87/{S}r-86 (0.7115 to 0.7176) and e{N}d (-7.8 to -1.9) signatures are particularly sensitive to discharge and {SPM} concentration variations. {A}long the hydrological year, two sources control the e{N}d variability: (1) volcanic rocks, which dominate during the dry season, and (2) plutonic/metamorphic sources, whose contribution increases during the wet season. {T}his behavior is confirmed by the correlation between e{N}d signature and the monthly rainfall contribution from volcanic area ({R} = 0.58; p-value < 0.01), and also with the daily discharge at the outlet ({R} = -0.73; p-value < 0.01). {F}or most of the samples, {S}r-87/{S}r-86 is less variable along the hydrological year. {H}owever, two exceptional high discharge and {SPM} concentration conditions sampled exhibit more radiogenic (higher) {S}r-87/{S}r-86 signatures when plutonic/metamorphic rocks derived sediments are released in sufficient quantities to notably change the {SPM} isotopic {S}r value of the {T}umbes {R}iver. {H}ence, this study demonstrates that {S}r-87/{S}r-86 and e{N}d signatures can be used as powerful proxies for paleoclimate reconstructions based on sediment core's analysis in relation with spatial rainfall distribution and intensity in {P}acific sedimentary basins submitted to the diversity of {ENSO} events.},
  keywords = {{R}iver ; {A}ndes ; {P}acific basin ; {S}r and {N}d radiogenic isotopes ; {S}uspended sediments ; {H}ydrology ; {PEROU} ; {ANDES} ; {PACIFIQUE}},
  booktitle = {},
  journal = {{G}lobal and {P}lanetary {C}hange},
  volume = {185},
  numero = {},
  pages = {103080 [12 ]},
  ISSN = {0921-8181},
  year = {2020},
  DOI = {10.1016/j.gloplacha.2019.103080},
  URL = {https://www.documentation.ird.fr/hor/fdi:010077894},
}