@article{fdi:010083864,
  title = {{V}ibrational spectroscopic study of three {M}g-{N}i mineral series in white and greenish clay infillings of the {N}ew {C}aledonian {N}i-silicate ores},
  author = {{F}ritsch, {E}mmanuel and {B}alan, {E}. and {P}etit, {S}. and {J}uillot, {F}arid},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his study presents and discusses infrared spectroscopic data of well characterised, naturally occurring trioctahedral layer silicates of the serpentine ({S}rp), talc ({T}lc), and sepiolite ({S}ep) mineral groups, which are found in reactivated faults and sequences of white and green clay veins (deweylite and garnierite) of the {N}ew {C}aledonian {N}i-silicate ores. {B}ands assigned to the {OH} stretching vibrations of these 1 : 1 and 2 : 1 layer silicates in both the fundamental and first overtone regions of mid- and near-infrared ({MIR} and {NIR}) spectra, respectively, are compared to those reported in the literature for synthetic {M}g-{N}i series of the {S}rp and {T}lc mineral groups. {T}hey are also presented according to the sequences of infillings recognised in the white and green veins of the {N}i-silicate ores. {T}he study reveals that serpentine-like ({SL}) minerals of the first sequences of clay infillings are residues of larger crystals of serpentines (lizardite, chrysotile, and antigorite) and that the newly formed talc-like ({TL}) minerals and {S}ep are the main {N}i-bearing carriers of the {N}i-silicate ores. {D}ecreasing crystal size and order in serpentine species have major effects on vibrational bands. {T}hey favour the broadening of the {OH} stretching bands, the degradation of the signals assigned to the interlayer {OH}, and the enhancement of the signal related to weakly bound water molecules. {T}he replacement of {M}g by {N}i in octahedral sites of the 2 : 1 layer silicates ({TL}, {S}ep) of the greenish clay infillings can be traced by specific {OH} stretching bands related to the {M}g3{OH}, {M}g2{N}i{OH}, {M}g{N}i2{OH}, and {N}i3{OH} configurations in the fundamental ({MIR}) and first overtone ({NIR}) regions of the spectra. {T}he dominance of the {M}g3{OH} and {N}i3{OH} configurations with respect to mixed configurations in the {M}g-{N}i mineral series of the clay infillings (mostly in the dominant {TL} minerals) suggests that {M}g and {N}i segregation is related to separate {M}g-rich and {N}i-rich mineral phases rather than to a cationic clustering within the individual particles. {T}his segregation of {M}g and {N}i in discrete mineral phases is related to {M}g-{N}i oscillatory zoning patterns (banded patterns) and is reproduced at the scale of the {N}i-silicate ores between the white (deweylite) and greenish (garnierite) veins of the reactivated faults.},
  keywords = {{NOUVELLE} {CALEDONIE}},
  booktitle = {},
  journal = {{E}uropean {J}ournal of {M}ineralogy},
  volume = {33},
  numero = {6},
  pages = {743--763},
  ISSN = {0935-1221},
  year = {2021},
  DOI = {10.5194/ejm-33-743-2021},
  URL = {https://www.documentation.ird.fr/hor/fdi:010083864},
}