Mountain building event in what is now West Africa
The Eburnean orogeny, or Eburnean cycle, was a series of
tectonic,
metamorphic and
plutonic events in what is now
West Africa during the
Paleoproterozoic era about 2200–2000 million years ago.
During this period the
Birimian domain in West Africa was established and structured.[2][3][4]
Eburnian faults are found in the
Eglab shield to the north of the
West African craton and in the
Man Shield to the south of the craton.[5]
There is evidence of three major Eburnean magmatic events in the Eglab shield.
Between 2210 and 2180 Ma, a metamorphosed batholith was formed in the Lower Reguibat Complex (LRC).
Around 2090 Ma, a syntectonic
trondhjemitic pluton intruded into the
Archaean reelects of the Chegga series. Around 2070 Ma an
asthenospheric upwelling released a large volume of post-orogenic magmas.[6]
Eburnian trends within the Eglab shield were repeatedly reactivated from the Neoproterozoic to the Mesozoic.[7]
^
abWright, J.B.; Hastings, D.A.; Jones, W.B.; Williams, H.R. (1985). Wright, J.B. (ed.). Geology and Mineral Resources of West Africa. London: George Allen & UNWIN. pp. 45–46.
ISBN9780045560011.
^Wright, J.B.; Hastings, D.A.; Jones, W.B.; Williams, H.R. (1985). Wright, J.B. (ed.). Geology and Mineral Resources of West Africa. London: George Allen & UNWIN. pp. 45–47.
ISBN9780045560011.