@article{PAR00013363,
  title = {{R}efertilization process in the {P}atagonian subcontinental lithospheric mantle of {E}stancia {S}ol de {M}ayo ({A}rgentina)},
  author = {{M}elchiorre, {M}. and {C}oltorti, {M}. and {G}r{\'e}goire, {M}ichel and {B}enoit, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}nhydrous mantle xenoliths equilibrated at 1003-1040 degrees {C} from {E}stancia {S}ol de {M}ayo ({ESM}, {C}entral {P}atagonia, {A}rgentina) and.entrained in post-plateau alkaline lavas belonging to {M}eseta {L}ago {B}uenos {A}ires have been investigated aiming at reconstructing the depletion and enrichment processes that affected this portion of the {P}atagonia lithospheric mantle. {X}enoliths are characterized by a coarse-grained protogranular texture and are devoid of evident modal metasomatism. {T}hey show two texturally different clinopyroxenes: protogranular (cpx1) and texturally related to spinet (cpx2). {T}hree different types of orthopyroxenes are also recognized: large protogranular crystals with exsolution lamellae (opxl); small clean and undeformed grains without exsolution lamellae (opx2) and small grains arranged in a vein (opx3). {M}ajor element composition of clinopyroxenes and orthopyroxenes highlights two different trends characterized by i) a high {A}l2{O}3 content at almost constant mg# and ii) a slight increase in {A}l2{O}3 content with decreasing mg$. {C}linopyroxenes are enriched in {LREE} and are characterized by prominent to slightly negative {N}b, {Z}r and {T}i anomalies. {N}o geochemical differences are observed between cpx1 and cpx2, while a discrimination can be observed between opxl and opx2 ({LREE}-depleted; prominent to slightly negative {T}i and {Z}r anomalies) and opx3 (prominent positive {Z}r anomaly). {P}artial melting modeling using both major and trace elements, indicates a melting degree between similar to 5% and similar to 13% (up to similar to 23% according to major element modeling) for lherzolites and between similar to 20% and similar to 30% for harzburgites (down to similar to 5% according to trace element modeling). {L}a/{Y}b and {A}l2{O}3, as well as {S}r and {A}l2{O}3 negative correlations in clinopyroxenes point to a refertilization event affecting this lithospheric mantle. {T}he agent was most probably a transitional alkaline/ subalkaline melt, as indicated by the presence of orthopyroxene in the vein and the similar geochemical features of {ESM} clinopyroxenes and those from {N}orthern {P}atagonia pyroxenites which are derived from transitional alkaline/subalkaline lavas.},
  keywords = {{P}atagonia ; {M}antle xenoliths ; {R}efertilization ; {T}-{P}-f{O}(2) conditions ; {ARGENTINE} ; {PATAGONIE}},
  booktitle = {},
  journal = {{T}ectonophysics},
  volume = {650},
  numero = {{SI}},
  pages = {124--143},
  ISSN = {0040-1951},
  year = {2015},
  DOI = {10.1016/j.tecto.2015.02.015},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00013363},
}