@article{fdi:010097369,
  title = {{M}ixed primary mica - secondary ion-clay volcanogenic sedimentary lithium deposits in the {N}eogene {M}acusani {V}olcanic {F}ield, {P}uno, {P}eru},
  author = {{S}egovia-{M}ore, {M}. and {T}orró, {L}. and {V}illanova-de-{B}enavent, {C}. and {R}amirez-{B}riones, {J}. and {B}aby, {P}atrice and {R}uiz, {A}. {I}. and {C}uevas, {J}. and {V}allance, {J}. and {M}onnier, {L}. and {L}aurent, {O}. and {S}alvi, {S}. and {P}roenza, {J}. {A}. and {N}ieto, {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {F}alchani {L}ithium {P}roject, a volcanogenic sedimentary deposit in the {N}eogene {M}acusani {V}olcanic {F}ield ({P}uno, {P}eru), hosts > 5.5 {M}t {L}i2{CO}3 resources and represents a significant potential complementary source for {S}outh {A}merican lithium production, currently dominated by {A}ndean salar deposits of the {L}ithium {T}riangle. {T}he ore comprises volcanogenic tuff and breccia subdivided into the {L}ithium-rich {T}uff and stratigraphically overlying and underlying {U}pper and {L}ower {B}reccia units, respectively. {P}rimary minerals include quartz, feldspars, and trioctahedral {L}i-{F} micas (zinnwaldite and lepidolite). {S}econdary minerals define a vertical mineralogical zonation. {T}he {L}ithium-rich {T}uff is characterized by abundant kaolinite and the preservation of {L}i-{F} micas, whereas the {U}pper and {L}ower {B}reccia are dominated by dioctahedral smectites (beidellite-montmorillonite series) with scarce, corroded relict micas. {Z}eolites locally occur as the predominant secondary phase in brecciated {L}ithium-rich {T}uff samples. {L}ithium contents peak in the {L}ithium-rich {T}uff (3000-4200 ppm {L}i), with the bulk hosted by {L}i-{F} micas, and only 7% as exchangeable {L}i. {C}onversely, the {U}pper and {L}ower {B}reccia units contain < 3000 ppm {L}i predominantly in interlayer positions of smectites, yielding high exchangeable {L}i proportions (63-88%). {T}his vertical variation reflects restricted fluid flow through the impermeable {L}ithium-rich {T}uff versus pervasive alkaline hydrothermal fluid circulation through brecciated units. {F}alchani is unusual in having both magmatic and authigenic lithium-rich phases. {T}hese observations support a tentative classification of {F}alchani as a mixed primary mica-secondary ion-clay volcanogenic sedimentary lithium deposit, a mineralization type not previously documented.},
  keywords = {{C}ritical raw materials ; {V}olcanogenic sedimentary lithium deposits ; {D}ioctahedral smectite ; {L}ithium micas ; {M}acusanite ; {PEROU} ; {MACUSANI} {VOLCAN}},
  booktitle = {},
  journal = {{M}ineralium {D}eposita},
  volume = {[{E}arly access]},
  numero = {},
  pages = {[20 p.]},
  ISSN = {0026-4598},
  year = {2026},
  DOI = {10.1007/s00126-026-01458-z},
  URL = {https://www.documentation.ird.fr/hor/fdi:010097369},
}