@article{fdi:010071096,
  title = {{T}oward the feldspar alternative for cosmogenic {B}e-10 applications},
  author = {{Z}erathe, {S}wann and {B}lard, {P}.{H}. and {B}ourl{\`e}s, {D}. and {A}udin, {L}aurence and {C}arcaillet, {J}. and {D}elgado, {F}. and {B}enavente, {C}. and {ASTER} {T}eam},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he possibility of quantifying surface processes in mafic or volcanic environment using the potentialities offered by the in situ-produced cosmogenic nuclides, and more specifically by the in situ-produced {B}e-10, is often hampered by the rarity of quartz minerals in the available lithologies. {A}s an alternative to overcome this difficulty, we explore in this work the possibility of relying on feldspar minerals rather that on quartz to perform in situ-produced {B}e-10 measurements in such environments. {O}ur strategy was to cross-calibrate the total production rate of {B}e-10 in feldspar ({P}-10fsp) against the total production rate of {H}e-3 in pyroxene ({P}-3px) by measuring {H}e-3 and {B}e-10 in cogenetic pyroxene ({H}e-3(px)) and feldspar ({B}e-10(fsp)). {T}he samples were collected from eight ignimbritic boulders, exposed from ca 120 to 600 ka at elevations ranging from 800 to 2500 m, along the preserved rock-avalanche deposits of the giant {C}aquilluco landslide (18 degrees {S}, 70 degrees {W}), {S}outhern {P}eru. {A}long with data recently published by {B}lard et al. (2013a) at a close latitude (22 degrees {S}) but higher elevation (ca. 4000 m), the samples yield a remarkably tight cluster of {H}e-3(px) - {B}e-10(fsp) total production ratios whose weighted-mean is 35.6 +/- 0.5 (1 sigma). {T}he obtained weighted mean {H}e-3(px) - {B}e-10(fsp) total production ratio combined with the local {H}e-3(py) total production rate in the high tropical {A}ndes published by {M}artin et al. (2017) allows to establish a total {SLHL} {B}e-10 in situ-production rate in feldspar mineral ({P}-10fsp) of 3.57 +/- 0.21 at.g(-1).yr(-1) (scaled for the {LSD} scaling scheme, the {ERA}40 atm model and the {VDM} of {L}ifton, 2016). {D}espite the large elevation range covered by the whole dataset (800-4300 m), no significant variation of the {H}e-3(px) - {B}e-10(fsp) total production ratios in pyroxene and feldspar was evidenced. {A}s an attempt to investigate the effect of the chemical composition of feldspar on the total {B}e-10 production rate, major and trace element concentrations of the studied feldspar samples were analyzed. {U}nfortunately, giving the low compositional variability of our dataset, this issue is still pending.},
  keywords = {{PEROU} ; {ANDES} ; {ATACAMA}},
  booktitle = {},
  journal = {{Q}uaternary {G}eochronology},
  volume = {41},
  numero = {},
  pages = {83--96},
  year = {2017},
  DOI = {10.1016/j.quageo.2017.06.004},
  URL = {https://www.documentation.ird.fr/hor/fdi:010071096},
}