@article{fdi:010087729,
  title = {{S}ubduction and hydrogen release : the case of {B}olivian altiplano},
  author = {{M}oretti, {I}. and {B}aby, {P}atrice and {Z}apata, {P}. {A}. and {M}endoza, {R}. {V}.},
  editor = {},
  language = {{ENG}},
  abstract = {{N}atural hydrogen is known to be generated in the crust by water/rock interactions, especially the oxidation of iron-rich rock or radiolysis. {H}owever, other sources, especially deeper ones, exist. {I}n the context of subduction, the dehydration of the slab, the destabilization of the {NH}4, and the hydration of the mantle wedge above the subducting lithosphere may generate {H}-2. {W}e present here a compilation of the known gases in the central part of the {P}acific subduction and the results of a first field acquisition dedicated to {H}-2 measurements in {B}olivia between {L}a {P}az and {S}outh {L}ipez. {V}arious zones have been studied: the emerging thrust faults of the western borders of the {E}astern {C}ordillera, the {S}ajama area that corresponds to the western volcanic zone near the {C}hile border northward from the {U}yuni {S}alar, and finally, the {A}ltiplano-{P}una {V}olcanic {C}omplex in {S}outh {L}ipez. {S}oil gas measurement within and around the {S}alar itself was not fully conclusive. {N}orth of the {U}yuni {S}alar, the gases are very rich in {CO}2, enriched in {N}-2 and poor in {H}-2. {O}n the opposite, southward, all the samples contain some {H}-2; the major gas is nitrogen, which may overpass 90% after air correction, and the {CO}2 content is very limited. {O}n the western border of the {C}ordillera, the delta {C}13 isotope varies between -5 and -13 parts per thousand(,) and it is not surprisingly compatible with volcanic gas, as well as with asthenospheric {CO}2. {T}he methane content is close to 0, and only a few points reach 1%. {T}he isotopes (-1 parts per thousand) indicate an abiotic origin, and it is thus related to deep {H}-2 presence. {T}he high steam flow in the geothermal area of {S}outh {L}ipez combined with the {H}-2 content in the water results in at least 1 ton of {H}-2 currently released per day from each well and may deserve an evaluation of its economic value. {T}he nitrogen content, as in other subduction or paleo-subduction areas, questions the slab alteration.},
  keywords = {natural hydrogen ; subduction ; nitrogen ; {B}olivia ; altiplano ; {BOLIVIE}},
  booktitle = {},
  journal = {{G}eosciences},
  volume = {13},
  numero = {4},
  pages = {109 [18 p.]},
  year = {2023},
  DOI = {10.3390/geosciences13040109},
  URL = {https://www.documentation.ird.fr/hor/fdi:010087729},
}