@article{fdi:010066864,
  title = {{A}uthigenic {B}e-10/{B}e-9 ratios and {B}e-10-fluxes ({T}h-230({XS})-normalized) in central {B}affin {B}ay sediments during the last glacial cycle : paleoenvironmental implications},
  author = {{S}imon, {Q}. and {T}houveny, {N}icolas and {B}ourles, {D}. {L}. and {N}uttin, {L}. and {H}illaire-{M}arcel, {C}. and {S}t-{O}nge, {G}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}uthigenic {B}e-10/{B}e-9 ratios and {B}e-10-fluxes reconstructed using the {T}h-230(xs), normalization, proxies of the cosmogenic radionuclide {B}e-10 production rate in the atmosphere, have been measured in a sedimentary core from {B}affin {B}ay ({N}orth {A}tlantic) spanning the last 136 ka {BP}. {T}he normalization applied on the exchangeable (authigenic) {B}e-10 concentrations using the authigenic {B}e-9 isotope and {T}h-230(xs) methods yield equivalent results strongly correlated with sedimentological parameters (grain-size and mineralogy). {L}ower authigenic beryllium ({B}e) concentrations and {B}e-10/{B}e-9 ratios are associated with coarse grained carbonate-rich layers, while higher authigenic {B}e values are related to fine-grained felspar rich sediments. {T}his variability is due to: i) sediment composition control over beryllium-scavenging efficiency and, ii) glacial history that contributed to modify the {B}e-10 concentration in {B}affin {B}ay by input and boundary scavenging condition changes. {M}ost paleo-denudation rates inferred from the {B}e-10/{B}e-9 ratio vary weakly around 220 +/- 76 tons.km(-2).yr(-1) (0.09 +/- 0.03 mm.yr(-1)) corresponding to relatively steady weathering fluxes over the last glacial cycle except for six brief intervals characterized by sharp increases of the denudation rate. {T}hese intervals are related to ice-surging episodes coeval with {H}einrich events and the last deglaciation period. {A}n average freshwater flux of 180.6 km(3).yr(-1) (0.006 {S}v), consistent with recent models, has been calculated in order to sustain glacially-derived {B}e-10 inputs into {B}affin {B}ay. {I}t is concluded that in such environments, the authigenic {B}e-10 measured mainly depends on climatic effects related to the glacial dynamics, which masks the {B}e-10 production variation modulated by geomagnetic field changes. {A}ltogether, these results challenge the simple interpretation of {B}e-10-concentration variation as a proxy of {I}nterglacial/{G}lacial (interstadial/stadial) cycles in {A}rctic and sub-{A}rctic regions. {T}hey rather suggest the effect of higher-frequency paleoclimatic changes and local glacial dynamics on {B}e-10 signature.},
  keywords = {{B}e-10 cosmogenic nuclide ; {A}uthigenic {B}e-10/{B}e-9 ratios ; (10){B}efluxes ; (230){T}hxs-normalization ; {B}affin bay ; {L}ate quaternary ; {G}lacial dynamics ; {S}tratigraphic markers ; {P}aleo-denudation rate ; {F}reshwater flux ; {ARCTIQUE} ; {BAFFIN} {MER}},
  booktitle = {},
  journal = {{Q}uaternary {S}cience {R}eviews},
  volume = {140},
  numero = {},
  pages = {142--162},
  ISSN = {0277-3791},
  year = {2016},
  DOI = {10.1016/j.quascirev.2016.03.027},
  URL = {https://www.documentation.ird.fr/hor/fdi:010066864},
}