Lower crust exhumation during Paleoproterozoic (Eburnean) orogeny, NW Ghana, West African Craton: Interplay of coeval contractional deformation and extensional gravitational collapse

Block, Sylvain; Jessell, Mark; Aillères, Laurent; Baratoux, Lenka; Bruguier, Olivier; Zeh, Armin; Bosch, Delphine; Caby, Renaud; Mensah, Emmanuel

doi:10.1016/j.precamres.2015.10.014

Cited by 66 publications

(72 citation statements)

References 125 publications

(58 reference statements)

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“…3). The shear zone also merges with the Fada N'Gourma shear zone in Ghana (Block et al, 2016b; see section 4). The systematic anastomosed branching pattern and the connectivity of the shear zones suggest that no individual shear zone did strictly outlast slip along its nearest neighbor(s) and that kinematic coherency has been maintained within the shear zone network throughout the deformation history.…”

Section: Fabric and Shear Zone Patternsmentioning

confidence: 81%

“…The resulting fabric/shear zone map of Burkina Faso (Fig. 3) is complemented in Northern Ghana by the shear zone pattern mapped by Block et al (2016b).…”

Section: Methodsmentioning

confidence: 99%

“…Steep lineations in transcurrent shear zones (e.g., Fontaine et al, 2017) are indicative of transpression as the dominant deformation mode of domain 1. If the Fada N'Gourma shear zone appears to be sinistral in Burkina Faso, Block et al (2016b) have shown that it was dextral in northern Ghana (Fig. 3).…”

Section: Fabric and Shear Zone Patternsmentioning

confidence: 98%

“…Fabric/shear zone map of the Birimian basement of Burkina Faso based on aeromagnetic data interpretation. The shear zone pattern in Ghana is adapted from Block et al (2016b). D:…”

Section: Fabric and Shear Zone Patternsmentioning

confidence: 99%

“…According to Block et al (2016b), in situ U-Pb dating indicates that domain 1 crustal shortening and coeval lower crustal flow took place essentially between ca. 2140 and 2110 Ma under high-grade metamorphic conditions, whereas strain localization along the strike-slip shear zones continued afterwards.…”

Section: Fabric and Shear Zone Patternsmentioning

confidence: 99%

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Eburnean deformation pattern of Burkina Faso and the tectonic significance of shear zones in the West African craton

Chardon

Bamba

Traoré

2020

BSGF - Earth Sci. Bull.

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Shear zones of the Paleoproterozoic Eburnean accretionary Orogen (West African craton) are investigated by means of large-scale structural mapping. Regional scale (10-100 km) mapping was based on the aeromagnetic survey of Burkina Faso and craton-scale (1000 km) mapping on a compilation of fabric data. At both scales, shear zones are arranged as an anastomosed transpressional network that accommodated distributed shortening and lateral flow of the orogenic lithosphere between the converging Kénéma-Man and Congo Archean provinces. Structural interference patterns at both scales were due to three-dimensional partitioning of progressive transpressional deformation and interactions among shear zones that absorbed heterogeneities in the regional flow patterns while maintaining the connectivity of the shear zone network. Such orogen-scale kinematic patterns call for caution in using the deformation phase approach without considering the “bigger structural picture” and interpreting displacement history of individual shear zones in terms of plate kinematics. The West African shear zone pattern is linked to that of the Guiana shield through a new transatlantic correlation to produce an integrated kinematic model of the Eburnean-Transamazonian orogen.

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Section: Fabric and Shear Zone Patternsmentioning

confidence: 81%

“…The resulting fabric/shear zone map of Burkina Faso (Fig. 3) is complemented in Northern Ghana by the shear zone pattern mapped by Block et al (2016b).…”

Section: Methodsmentioning

confidence: 99%

Section: Fabric and Shear Zone Patternsmentioning

confidence: 98%

“…Fabric/shear zone map of the Birimian basement of Burkina Faso based on aeromagnetic data interpretation. The shear zone pattern in Ghana is adapted from Block et al (2016b). D:…”

Section: Fabric and Shear Zone Patternsmentioning

confidence: 99%

Section: Fabric and Shear Zone Patternsmentioning

confidence: 99%

See 3 more Smart Citations

Eburnean deformation pattern of Burkina Faso and the tectonic significance of shear zones in the West African craton

Chardon

Bamba

Traoré

2020

BSGF - Earth Sci. Bull.

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West African Leo‐Man Shield Metallogenic Province

EGLINGER,

ANDRÉ‐MAYER,

THÉBAUD

et al. 2023

Metallic Resources 2

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Detrital zircon U–Pb–Hf data from Cambrian sandstones of the Ougarta Mountains Algeria: Implication for palaeoenvironment

et al. 2020

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We report new detrital zircon U-Pb ages and Hf isotopic signatures of detrital zircons in Cambrian sedimentary rocks from the Ougarta Mountains of Algeria in the West African Craton (WAC) in order to provide constraints on the palaeo-catchments of the Early Palaeozoic river systems draining Gondwana. The Cambrian sedimentary samples from the Ougarta Mountains have near-identical age spectra with a dominant age peak at 618 Ma and an additional age peak at 2,035 Ma. The oldest detrital zircon grain is 3,407 Ma. The εHf (t) values of the 618 Ma age peak spans from εHf (t) +12 to −25 with a dominant mode at −1; the εHf (t) of the Palaeoproterozoic zircon ranges from 6 to −27 with an average of −10; the pre-2,300 Ma zircon Hf lie along a crustal evolution trajectory (176 Lu/ 177 Hf = 0.01) back to the depleted mantle at 3,100 Ma. The maximum depositional age of the sandstones in the Sebkhet el Melah Formation is constrained by the youngest detrital zircon age of 559 ± 13 Ma and by the underlying volcaniclastic rocks dated at 555 ± 7 Ma (Late Ediacaran to the Early Cambrian). The 618 and 2,035 Ma age peaks are consistent with a proximal provenance from the WAC, and it is possible that recycling of eroded material from the Cadomian arc and Pan-African rocks may have been a potential source of the Ediacaran detrital zircons analysed herein. There were four (0.9%) Stenian detrital zircons identified in this study, and our results are consistent with the lack of WAC Stenian detrital zircon noted in previous studies, except those reported from a single Middle Cambrian sample in Morocco. Correlative sedimentary successions further to the east contain ubiquitous ca. 1.0 Ga detrital zircon that was likely supplied from the Trans-Gondwana Mountain chain. It is noteworthy that the WAC and Sahara Metacraton are surrounded on three sides by Neoproterozoic orogenic systems, with the Rokelide, Dahomeyide, Pharuside, Anti-Atlas, and Brasiliano orogens (reconstructed position from Gondwana palaeogeography) around the WAC and the Dahomeyide, Pharuside, East African orogen, and Oubangides orogens around the Sahara Metacraton. We posit these orogenic belts acted as drainage divides that controlled sediment routing pathways. Additionally, the occurrence of Stenian detrital zircon in Morocco could be explained by longshore drift coming from the east (present-day coordinates).

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Lower crust exhumation during Paleoproterozoic (Eburnean) orogeny, NW Ghana, West African Craton: Interplay of coeval contractional deformation and extensional gravitational collapse

Cited by 66 publications

References 125 publications

Eburnean deformation pattern of Burkina Faso and the tectonic significance of shear zones in the West African craton

Eburnean deformation pattern of Burkina Faso and the tectonic significance of shear zones in the West African craton

West African Leo‐Man Shield Metallogenic Province

Detrital zircon U–Pb–Hf data from Cambrian sandstones of the Ougarta Mountains Algeria: Implication for palaeoenvironment

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