@article{PAR00010419,
  title = {{M}elt inclusions in olivine and plagioclase phenocrysts from {A}ntarctic-{P}hoenix {R}idge basalts : {I}mplications for origins of {N}- and {E}-type {MORB} parent magmas},
  author = {{C}hoi, {S}. {H}. and {S}chiano, {P}ierre and {C}hen, {Y}. and {D}evidal, {J}. {L}. and {C}hoo, {M}. {K}. and {L}ee, {J}. {I}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {A}ntarctic-{P}hoenix {R}idge ({APR}) is a fossil spreading center in the {D}rake {P}assage, {A}ntarctic {O}cean. {S}preading ceased in chron {C}2{A} (ca. 3.3 {M}a). {A}lthough the {APR} is a normal ridge that is not influenced by a hotspot, enriched ({E}-type) mid-ocean ridge basalt ({MORB}) coexists with normal ({N}-type) {MORB} in the ridge's axial region. {T}he {E}-type {APR} basalt is relatively young (<3.1 {M}a) compared to the {N}-type basalt (>3.5 {M}a). {T}he {E}-type basalt is characterized by elevated {K}2{O}/{T}i{O}2 (=0.4-0.8) and ({L}a/{S}m)({N}) (=22-3.4) ratios, relative to the {N}-type basalt ({K}2{O}/{T}i{O}2=0.1-0.3; ({L}a/{S}m)({N})=0.7-0.8). {T}o better understand the compositional variation in the {APR} basalts and their mantle source regions through time, silicate melt inclusions in primitive olivine ({F}o(87-89)) and plagioclase ({A}n(85-89)) phenocrysts from the {N}-type {APR} basalt were studied. {R}ehomogenized melt inclusions were analyzed by electron microprobe and {LA}-{ICPMS} for major and trace elements. {T}he melt inclusions are more primitive than the host basalt, with {M}g#s from 67.5 to 74.1. {A}ll inclusions exhibit patterns that are depleted in the light rare earth elements. {T}he inclusions have {K}2{O}/{T}i{O}2 from 0.1 to 0.3 and ({L}a/{S}m){N} ratios from 0.4 to 0.9; these values overlap with those of the {N}-type {APR} basalt. {F}urthermore, the melt inclusions have elevated ({L}u/{H}f)({N}) and ({S}m/{N}d)({N}) ratios compared to the {E}-type basalts. {T}he {N}-type {APR} basalts do not contain any melt inclusions that are enriched in incompatible elements. {T}he {E}-type basalt was generated by a low degree of partial melting of a relatively incompatible-element-enriched mantle source. {I}n contrast, chemistries of melt inclusions and {N}-type basalts are compatible with high degrees of partial melting of an increasingly depleted mantle source. {A}ssuming a veined or otherwise heterogeneous mantle, the absence of {E}-type inclusions from the {N}-type host has implications for cyclic magmatic activity beneath the {APR}. {M}ulti-stage mantle melting and melt extraction from a composite source with sequential extraction of melt fluids might give rise to the primary melt diversity documented in the {APR} axis. {T}he mantle source of the {N}-type melts may have been the residue from an earlier phase of melting that removed the easily melted, enriched components. {T}he {N}-type {APR} basalt studied represents melt at the end of single cycle, whereas the {E}-type basalt may represent the early stage of a new pulse that was dominated by highly enriched components.},
  keywords = {{M}elt inclusion ; {O}livine phenocryst ; {P}lagioclase phenocryst ; {N}-{MORB} ; {E}-{MORB} ; {A}ntarctic-{P}hoenix ridge ; {OCEAN} {ANTARCTIQUE}},
  booktitle = {},
  journal = {{J}ournal of {V}olcanology and {G}eothermal {R}esearch},
  volume = {253},
  numero = {},
  pages = {75--86},
  ISSN = {0377-0273},
  year = {2013},
  DOI = {10.1016/j.jvolgeores.2012.12.008},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00010419},
}