@article{PAR00012039,
  title = {{L}ead isotope signatures of {K}erguelen plume-derived olivine-hosted melt inclusions : constraints on the ocean island basalt petrogenesis},
  author = {{B}orisova, {A}. {Y}. and {F}aure, {F}. and {D}eloule, {E}. and {G}r{\'e}goire, {M}ichel and {B}ejina, {F}. and de {P}arseval, {P}. and {D}evidal, {J}. {L}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he nature of magmatic sources reflected by isotopic composition of the ocean island basalt ({OIB}) remains an ongoing question in igneous geochemistry. {T}o constrain the magmatic sources for {OIB} related to the {K}erguelen plume activity, we performed detailed microanalytical investigation of the 21.4 {M}a picritic basalt ({MD}109-{D}6-87) dredged during the "{M}arion {D}ufresne" cruise on a seamount between {K}erguelen {A}rchipelago and {H}eard {I}sland. {L}ead isotope compositions of olivine-hosted melt inclusions and matrix glasses were measured by {L}aser {A}blation {M}ultiple {C}ollector {I}nductively {C}oupled {P}lasma {M}ass {S}pectrometry ({LA}-{MC}-{ICP}-{MS}) and {S}econdary {I}on {M}ass {S}pectrometry ({SIMS}). {W}e also performed major and trace element microanalyses and mapping of the inclusions and the host olivine phenocrysts by electron microprobe (wavelength-dispersive {X}-ray spectroscopy, {WDS}). {T}he observed significant major element ({K}2{O}/{P}2{O}5, {A}l2{O}3/{T}i{O}2) and {P}b isotope ({P}b-207/{P}b-206 and {P}b-208/{P}b-206) heterogeneities of parental melts ({M}g{O} = 7-10 wt.%) during early high pressure crystallisation stage (200-300 {MP}a, {F}o(82-86) mol%), and relative homogeneity at later lower-pressure crystallisation stage (<100 {MP}a, {F}o(75-80) mol%) are interpreted by mixing between "{P}lume" and "{A}ssimilant" melts during magma residence and transport. {L}ead isotope composition of the parental basaltic melts was inherited from both heterogeneous mantle and the {K}erguelen {P}lateau crust. {H}igh {K}2{O}/{P}2{O}5 (>4), {A}l2{O}3/{T}i{O}2 (>4) ratios are attributed to assimilation of the plateau basaltic crust (>= 50 wt.%) by the melts in the magma chamber at palaeodepths from 6 to 9 km. {T}he crustal assimilation may have happened through plagioclase dissolution. {T}he large chemical and isotopic heterogeneity of the parental {OIB} melts found by in situ microanalyses in this study suggests that the bulk rock chemistry alone cannot provide enough information to constrain the nature of the magmatic sources.},
  keywords = {{O}cean island basalt ; {K}erguelen plume ; {M}elt inclusions ; {C}rustal assimilation ; {M}elt mixing ; {DUPAL} isotope anomaly ; {KERGUELEN}},
  booktitle = {},
  journal = {{L}ithos},
  volume = {198},
  numero = {},
  pages = {153--171},
  ISSN = {0024-4937},
  year = {2014},
  DOI = {10.1016/j.lithos.2014.03.022},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00012039},
}