@article{fdi:010091950,
  title = {{PGE}-{N}i-{C}u sulphide segregation by interaction of basaltic melt and peridotite xenoliths of the {C}atalan {V}olcanic {Z}one ({S}pain)},
  author = {{R}oquet, {M}. and {S}chettino, {E}. and {C}ampeny, {M}. and {G}onzález-{J}im{\'e}nez, {J}. {M}. and {G}r{\'e}goire, {M}. and {P}iña, {R}. and {L}eisen, {M}athieu and {P}roenza, {J}. {A}. and {L}aurent, {O}. and {P}lanaguma, {L}. and {L}lovet, {X}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}pinel lherzolite xenoliths from the {S}ant {C}orneli volcano ({C}atalan {V}olcanic {Z}one, {NE} {S}pain) carry the geochemical imprint of melt/rock reaction events that have affected the subcontinental lithospheric mantle ({SCLM}) beneath the northeastern {I}berian margin. {T}race element signatures of clinopyroxene indicate that this volume of the {SCLM} initially experienced low degrees ({F} = 8 %) of partial melting, followed by extensive refertilization by alkaline silicate melts undergoing chromatographic fractionation while percolating through the mantle peridotites. {F}urthermore, the presence of interstitial sulphide-bearing silicate glass, as well as secondary coronitic rims around mantle minerals, records the melt/rock reaction product associated with the infiltration of the host alkaline basalts while erupting to the surface. {A}bundant irregular/blocky sulphides located within the interstitial glass patches are comprised of myrmekitic intergrowths of pentlandite +/- bornite +/- chalcopyrite, suggesting their derivation from immiscible droplets of {F}e-{N}i-{C}u sulphide melt transported by the host alkaline basalts. {T}he variable chondrite-normalized platinum-group element ({PGE}) systematics and chalcogenes ({S}e, {T}e, {A}s, {B}i and {S}b) abundances of these sulphides track two distinct transport mechanisms for their parental sulphide melts: 1) by unmixing of {N}i-{C}u-rich sulphide liquid in alkaline basalts attaining sulphide-saturation while interacting with the peridotite xenoliths, and 2) by mechanical transport of immiscible droplets of {N}i-{C}u-rich sulphide liquid originally extracted by residual monosulphide solid solution undergoing incongruent melting in their mantle source. {I}n addition, many sulphides have {PGE} abundances that cannot be explained solely by solid-melt chemical partition coefficients but that were likely influenced by the mechanical entrapment, or earlymagmatic segregation, of pre-existing {PGE}-rich nanoparticles or nanomelts. {T}he geochemical signal of these mineral nanoparticles may significantly influence sulphides {PGE} distribution, sometimes resulting in pronounced positive anomalies in {I}r-{R}h, {A}u, or {R}u-{R}h, along with negative anomalies in {P}t.},
  keywords = {{S}ulphides ; {M}antle xenoliths ; {M}etasomatism ; {S}ubcontinental lithospheric mantle ; {C}atalan {V}olcanic {Z}one ; {ESPAGNE}},
  booktitle = {},
  journal = {{L}ithos},
  volume = {488},
  numero = {},
  pages = {107820 [16 ]},
  ISSN = {0024-4937},
  year = {2024},
  DOI = {10.1016/j.lithos.2024.107820},
  URL = {https://www.documentation.ird.fr/hor/fdi:010091950},
}