@article{fdi:010068816,
  title = {{P}aleoproterozoic juvenile crust formation and stabilisation in the south-eastern {W}est {A}frican {C}raton ({G}hana) ; new insights from {U}-{P}b-{H}f zircon data and geochemistry},
  author = {{B}lock, {S}. and {B}aratoux, {L}enka and {Z}eh, {A}. and {L}aurent, {O}. and {B}ruguier, {O}. and {J}essell, {M}. and {A}illeres, {L}. and {S}agna, {R}. and {P}arra-{A}vila, {L}. {A}. and {B}osch, {D}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he crust of the {P}aleoproterozoic {W}est {A}frican {C}raton in northern {G}hana is dominantly made of {T}onalite-{T}rondhjemite-{G}ranodiorite ({TTG}) suites, low-{K} to high-{K} calc-alkaline granites, with minor {LILE}-enriched diorites, and chemically related lavas. {R}esults of zircon {U}-{P}b dating indicate that all these different rock types were formed together over a prolonged period of ca. 100 {M}a, between 2.21 and 2.11 {G}a. {Z}ircon {H}f isotope compositions of five samples are supra-chondritic (clift from +1 to +6) indicating that the granitoids derive from the reworking of juvenile crustal components as old as 2.60 {G}a. {G}eochemical data show that the {TTG}s were derived from the reworking of a low-{K} mafic crust, while biotite granites formed by the reworking of older felsic crustal rocks, and diorites derived from the melting of {LILE}-enriched mantle sources. {T}he combined datasets support a three-step model for the formation of the crust of the {W}est {A}frican craton in northern {G}hana: (1) a juvenile, mafic proto-crust was extracted from the depleted mantle between 2.60 and 230 {G}a, in an oceanic environment remote from any pre-existing continental nucleus; (2) the mafic proto-crust was reworked in several primitive magmatic arcs or in accreted oceanic plateaux. {C}rustal reworking initially produced minor felsic magmatism between 235 and 2.21 {G}a, followed by the 2.21-2.15 {G}a emplacement of low- to medium-{P} {TTG} and {K}-rich calc-alkaline granitoid suites, and was coeval with the formation of an enriched mantle source. (3) {V}arious proto-continental terranes collided during the {E}burnean orogeny between 2.14 and 2.11 {G}a, triggering intense reworking of the composite crust and mantle reservoirs formed in the previous two steps, i.e. remnants of the juvenile mafic crust, older {TTG}s and biotite granites, and previously enriched mantle sources. {T}he emplacement of high {P} {TTG}s, granites and {LILE}-enriched diorites resulted from lower crustal heating in response to the delamination of the lower crust and lithospheric mantle. {T}he {E}burnean collision therefore marks the final stages of a 200-500 {M}a long period of juvenile continental crust formation and stabilisation. {T}he datasets further reveal that the {P}aleoproterozoic {W}est {A}frican {C}raton comprises a minimum of two distinct crustal blocks, with north-western {G}hana lying at their interface.},
  keywords = {{P}aleoproterozoic ; {G}ranitoid ; {W}est {A}frican {C}raton ; {Z}ircon ; {UP}b-{H}f isotopes ; {C}rustal evolution ; {GHANA}},
  booktitle = {},
  journal = {{P}recambrian {R}esearch},
  volume = {287},
  numero = {},
  pages = {1--30},
  ISSN = {0301-9268},
  year = {2016},
  DOI = {10.1016/j.precamres.2016.10.011},
  URL = {https://www.documentation.ird.fr/hor/fdi:010068816},
}