@article{PAR00004542,
  title = {{U}nravelling the effects of melt depletion and secondary infiltration on mantle {R}e-{O}s isotopes beneath the {F}rench {M}assif {C}entral},
  author = {{H}arvey, {J}. and {G}announ, {A}. and {B}urton, {K}.{W}. and {S}chiano, {P}ierre and {R}ogers, {N}.{W}. and {A}lard, {O}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}pinel lherzolite xenoliths from {M}ont {B}riancon, {F}rench {M}assif {C}entral, retain evidence for multiple episodes of melt depletion and melt/fluid infiltration (metasomatism). {E}vidence for primary melt depletion is still preserved in the co-variation of bulk-rock major elements ({M}g{O} 38.7-46.1 wt.%; {C}a{O} 0.9-3.6 wt.%), and many samples yield unradiogenic bulk-rock {O}s isotope ratios ({O}s-187/{O}s-188 = 0.11541-0.12626). {H}owever, many individual xenoliths contain interstitial glasses and melt inclusions that are not in equilibrium with the major primary minerals. {I}ncompatible trace element mass balance calculations demonstrate that metasomatic components comprise a significant proportion of the bulk-rock budget for these elements in some rocks, ranging to as much as 25%, of {N}d and 40% of {S}r {C}ritically, for {R}e-{O}s geochronology, melt/fluid infiltration is accompanied by the mobilisation of {S}ulfide. {C}onsequently, bulk-rock isotope measurements, whether using lithophile (e.g. {R}b-{S}r, {S}m-{N}d) or siderophile ({R}e-{O}s) based isotope systems, may only yield a perturbed and/or homogenised average of these multiple events. {O}smium mass balance calculations demonstrate that bulk-rock {O}s in peridotite is dominated by contributions from two populations of sulfide grain: (i) interstitial, metasomatic {S}ulfide with low [{O}s] and radiogenic {O}s-187/{O}s-188, and (ii) primary sulfides with high [{O}s] and unradiogenic {O}s-187/{O}s-188, which have been preserved within host silicate grains and shielded from interaction with transient melts and fluid. {T}he latter can account for >97% of bulk-rock {O}s and preserve geochronological information of the melt from which they originally precipitated as an immiscible liquid. {T}he {R}e-depletion model ages of individual primary sulfide grains preserve evidence for melt depletion beneath the {M}assif {C}entral from at least 1.8 {G}yr ago despite the more recent metasomatic event(s).},
  keywords = {{FRANCE}},
  booktitle = {},
  journal = {{G}eochimica et {C}osmochimica {A}cta},
  volume = {74},
  numero = {1},
  pages = {293--320},
  ISSN = {0016-7037},
  year = {2010},
  DOI = {10.1016/j.gca.2009.09.031},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00004542},
}