@article{fdi:010072659,
  title = {{R}ole of volcano-sedimentary basins in the formation of greenstone-granitoid belts in the {W}est {A}frican craton : a numerical model},
  author = {{F}eng, {X}. {J}. and {W}ang, {E}. {Y}. and {G}anne, {J}{\'e}r{\^o}me and {A}mponsah, {P}. and {M}artin, {R}.},
  editor = {},
  language = {{ENG}},
  abstract = {{G}reenstone belts in the {W}est {A}frican {C}raton ({WAC}) are separated by several generations of granitoids intruded at ca. 2.18-1.98 {G}a. {S}imultaneous folding and exhumation play an important role in the formation of greenstone-granitoid belts. {H}owever, the overall tectonic regime and origin of granitoids remain controversial. {I}n this study, we present the estimates of the mantle potential temperature ({T}p) for the {WAC}, which yields values of about 1500-1600 degrees {C}, pressure estimates of initial and final melting yield values of about 3.7-5.2 {GP}a and 1-1.3 {GP}a, respectively. {S}ubsequently, 2{D} thermo-mechanical models have been constructed to explore the width of volcano-sedimentary basin on spatial-temporal evolution of diapirs that emplaced in the lower-middle crust during compression. {T}he models show that the width of the volcano-sediment layer plays an important role in the formation mechanisms of greenstone-granitoid belts. {T}he lower crust beneath sedimentary sequences is deformed into a buckle fold during the first compressional stage, through which relief uplifts slowly. {S}ubsequently, the buckle fold is further deformed into several individual folds. {D}iapirs made of lower crust rocks ascend and emplace in the middle-upper crust resulting from instability. {B}enefitting from the mantle temperature, the pressure estimates and the numerical modelling results, a new geodynamic model was constructed. {T}his model indicates that a series of sheet-like granitoids possibly derived from either subducted melanges, lower crust and/or mantle melting that are accumulated at depths of the subcontinental mantle would channel along diapirs before feeding the upper crust. {W}hen the granitoids arrive at the solidified lids of the diapirs, they would favour migrating horizontally and intrude into the upper crust through weakening zones between the diapirs. {O}ur geodynamic model also suggests an asymmetry of structures between the upper and middle-lower crust, with the dome-like granitoids overlying high-grade sedimentary synforms and high-grade diapirs underlying low-grade greenstone belts.},
  keywords = {mantle potential temperature ; olivine liquidus temperature ; thermo-mechanical model ; exhumation ; {E}burnean {O}rogeny ; {W}est {A}frican {C}raton ({WAC}) ; {AFRIQUE} {DE} {L}'{OUEST}},
  booktitle = {},
  journal = {{M}inerals},
  volume = {8},
  numero = {2},
  pages = {art. 73 [28 p.]},
  ISSN = {2075-163{X}},
  year = {2018},
  DOI = {10.3390/min8020073},
  URL = {https://www.documentation.ird.fr/hor/fdi:010072659},
}