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Volume 34 Issue 5
Oct 2023
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Journal of Earth Science  > 2023  >  34(5): 1465-1487.
Belmien Robinson Sobze Yemdji, Jules Tcheumenak Kouémo, Eric Martial Fozing, Ludovic Achu Megnemo, Julios Efon Awoum, Agnes Blandine Kamgang Tchuifong, Brice Rostant Tepi Yemele, Maurice Kwékam. Kinematic Evolution of the Nyakong-Manyi Shear Zone (Adamawa, Cameroon): Constraints from Field Observations and Microstructures, and Implication for Metamorphic P-T-t Estimation. Journal of Earth Science, 2023, 34(5): 1465-1487. doi: 10.1007/s12583-023-1816-4
Citation: Belmien Robinson Sobze Yemdji, Jules Tcheumenak Kouémo, Eric Martial Fozing, Ludovic Achu Megnemo, Julios Efon Awoum, Agnes Blandine Kamgang Tchuifong, Brice Rostant Tepi Yemele, Maurice Kwékam. Kinematic Evolution of the Nyakong-Manyi Shear Zone (Adamawa, Cameroon): Constraints from Field Observations and Microstructures, and Implication for Metamorphic P-T-t Estimation. Journal of Earth Science, 2023, 34(5): 1465-1487. doi: 10.1007/s12583-023-1816-4
shu

Kinematic Evolution of the Nyakong-Manyi Shear Zone (Adamawa, Cameroon): Constraints from Field Observations and Microstructures, and Implication for Metamorphic P-T-t Estimation

doi: 10.1007/s12583-023-1816-4
  • 1.

    Department of Earth Science, University of Dschang, Dschang 67, Cameroon

  • 2.

    Department of Earth Science, Faculty of Science, University of Douala, Douala 24157, Cameroon

More Information
  • Corresponding author: Eric Martial Fozing, emfozing@gmail.com
  • Received Date: 12 Aug 2022
  • Accepted Date: 16 Jan 2023
    • Available Online: 14 Oct 2023
  • Issue Publish Date: 30 Oct 2023
    Abstract

  • The Nyakong-Manyi Shear Zone (NMSZ) is a NE-SW elongated corridor found to the northwest of the Foumban-Bankim Shear Zone (FBSZ) along the Central Cameroon Shear Zone. Controversial chronology models has been proposed for the kinematic evolution of the sinistral and dextral shear phases in the Tikar Plain, thus in the FBSZ; early dextral and late sinistral shear phases for some authors and early sinistral and late dextral shear for others. Moreover, the NMSZ kinematic evolution implication on the mylonitization P-T-t path in the area seem to be problematic and the present paper aim is to clear enough those problems; since this shear zone is the main mylonitic corridor that registered the left and right lateral movement in this area. The NMSZ comprises amphibolites, protomylonites, strict sensus mylonites (garnet-kyanite-sillimanite mylonite and garnet-pyroxene mylonite), ultramylonites kyanite-sillimanite and garnet-kyanite-sillimanite gneiss. Field structures testify that the investigated area recorded three deformation phases: (ⅰ) the D1 deformation phase which is marked by NW-SE to N-S trending S1 metamorphic foliation with low to moderate dips (15°–45°) that was transposed during the D2 phase, is responsible for a regional metamorphism whose mineral paragenesis is garnet-kyanite-sillimanite; (ⅱ) the early sinistral NNE-SSW to NE-SW shear phase D2 marked by S2 metamorphic and mylonitic foliations; responsible for, L2 stretching mineral lineation, F2 fold axes and B2 boudins structures; (ⅲ) the late dextral NE-SW shear phase D3, characterized by F3 folds, B3 boudins and ductile dextral C3 shear planes. Mineral paragenesis garnet + kyanite + sillimanite and microstructures within gneiss testify that this rock underwent high grade regional metamorphism whose peak conditions are estimated at 11.5–13.5 kbar/850–900 ℃. After the peak of metamorphism gneiss was overprinted by high grade pressure mylonitization during the early sinistral and late dextral shear deformations. Microstructural data here indicate a high-grade mylonitization whose P-T conditions are estimated at least at around 10 kbar/750 ℃ attained during the D2. Shear markers, indicates that the studied area underwent an intense mylonitization at deep crustal deformation level, probably at the ductile-brittle boundary structural level during a major dextral shear deformation.

     

    • Conflict of Interest
    The authors declare that they have no conflict of interest.
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