@article{fdi:010055925,
  title = {{R}evised {E}burnean geodynamic evolution of the gold-rich southern {A}shanti {B}elt, {G}hana, with new field and geophysical evidence of pre-{T}arkwaian deformations},
  author = {{P}errouty, {S}. and {A}ill{\`e}res, {L}. and {J}essell, {M}arc and {B}aratoux, {L}enka and {B}ourassa, {Y}. and {C}rawford, {B}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}ntegration of regional geophysical datasets and detailed field observations provide new insights into the paleoproterozoic structural evolution of southwestern {G}hana. {T}he study area is dominated by three metavolcanic and metasedimentary packages known as the {S}efwi {G}roup, the {K}umasi {G}roup ({B}irimian) and the {T}arkwa {G}roup ({T}arkwaian) that were intruded by abundant {TTG} granitoids during the {E}oeburnean and {E}burnean phases of an event termed the "{E}burnean {O}rogeny". {T}his study identifies an {E}oeburnean (pre-{T}arkwaian) deformation event ({D}1) that produced significant deformation in the {S}efwi {G}roup metavolcanics. {D}1 is associated with {N}-{S} shortening manifested as regional scale folding in the southern {A}shanti {B}elt. {D}1 synorogenic granitoids were intruded between 2187 {M}a and 2158 {M}a under greenschist metamorphic condition. {S}yn-{D}1 gold mineralisation associated with quartz veining could be the original source of {T}arkwaian paleo-placers and/or remobilised gold concentrations along major shear zones. {D}2 represents an extensional phase associated with the {K}umasi {G}roup sedimentation (2154-2125 {M}a) which could be related to activation of major structures such as the {A}shanti {F}ault as low angle detachments that controlled the deposition of the {K}umasi {G}roup and the opening of the {K}umasi and {A}kyem {B}asin. {T}he {T}arkwa {G}roup (2107-2097 {M}a) unconformably overlies the {B}irimian {S}upergroups and was deposited in response to {D}3 shortening. {D}3 resulted in the inversion of syn-{D}2 detachments faults within the {A}shanti {B}elt. {NW}-{SE} {D}3 shortening produced regional scale folding within the {B}irimian and the {T}arkwaian metasediments. {D}4 deformation corresponds with sinistral reactivation of {D}3 thrust faults, and is locally associated with macro-scale folding at {O}buasi and {W}assa gold mines. {B}y the end of {D}4, the regional scale architecture was built and was only slightly modified by the two last events. {D}5 postdates the {E}burnean metamorphic peak and corresponds to open recumbent folds associated with a subhorizontal crenulation cleavage. {D}6 is present as a subvertical crenulation cleavage and reverse faults associated with {NE}-{SW} shortening.},
  keywords = {{B}irimian ; {E}burnean ; {P}aleoproterozoic ; {G}hana ; {M}ineralisation},
  booktitle = {},
  journal = {{P}recambrian {R}esearch},
  volume = {204},
  numero = {},
  pages = {12--39},
  ISSN = {0301-9268},
  year = {2012},
  DOI = {10.1016/j.precamres.2012.01.003},
  URL = {https://www.documentation.ird.fr/hor/fdi:010055925},
}