Staff directory
Jean-Paul Liégeois
Earth Sciences
Geodynamics and mineral resources
Geodynamics and mineral resources
Publication details
Wane, O., Liégeois, J.P., Thébaud, N., Miller, J., Metelka, V. & Jessell, M. 2018. ‘The onset of the Eburnean collision with the Kenema-Man craton evidenced by plutonic and volcanosedimentary rock record of the Massigui region, southern Mali’. Precambrian Research 305: 444-478. Amsterdam : Elsevier. I.F. 3.84.
Article in a scientific Journal / Article in a Journal
The Massigui region is located in the western Paleoproterozoic Baoulé-Mossi domain close to the Archean
Kenema-Man domain, Man Shield, West African Craton, which is an ideal place for studying their amalgamation.
The Massigui region consists of volcano-sedimentary sequences intruded by granitoid and dioritoid bodies and is
transected by the large NE-SW Banifing Shear Zone. Metamorphism reached upper greenschist facies, locally
amphibolite facies. Four tectonic phases have been recorded. The isoclinal folding D1 and transpressive D2
deformations correspond to the formation and the displacement along the Banifing Shear Zone that occurred
during the deposition of the volcano-sedimentary sequences and the emplacement of most granitoids. Brittleductile
deformation D3 participated in the structuration of the area while post-Eburnean D4 brittle deformation
had only minor effects.
Zircon SHRIMP U-Pb ages of granitoids and dioritoids indicate a major period of magmatic activity at c.
2100 Ma (Massigui quartz monzodiorite: 2112 ± 5 Ma, granodiorite: 2103 ± 5 Ma, pink quartz monzonite:
2095 ± 9 Ma; Syobougou quartz microdiorite: 2102 ± 10 Ma; Tiéfala foliated quartz micromonzodiorite:
2106 ± 11 Ma). SHRIMP U-Pb ages of detrital zircons show that the sources of the sediment are exclusively
Birimian, with three well-defined detrital ages at 2125 ± 8 Ma (22% zircons), 2148 ± 6 Ma (28%) and
2215 ± 13 Ma (14%). Major and trace elements indicate that the dioritic intrusions belong to a medium-K
sequence showing rapid K enrichment announcing the magmatic emplacement of the high-K calc-alkaline
granitoids that form most of the Massigui batholiths.
The proposed regional model includes: (1)>2125 Ma oceanic plate subduction towards the E below the
Baoulé-Mossi Birimian segment; (2) 2125–2090 Ma oblique continental subduction of the Archean Kenema-Man
craton (closure of the Birimian ocean, collision stage), major movements along the Banifing shear zone, magmatism
and volcano-sedimentary deposition in the Massigui region; (3) 2090–2020 Ma metacratonization of the
subducting Kenema-Man craton generating the emplacement of magmas with Archean protoliths, a main difference
with the Baoulé-Mossi juvenile granitoids. Paleomagnetic data, similar lithologies and ages suggest that
the Kenema-Man craton was a part of the Sarmatia craton, tying the geotectonic evolution of the region to the
Columbia supercontinent amalgamation.