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Vincent, NGAKO, Emmanuel, Njonfang, Julien, Bernard, Jean Marcel, Abate Essi, Mero, Yannah, Augustin Patrice, Moussango Ibohn, Sylvestre, Ntomba, Yaya, Fodoue, Zénon, Itiga. (1401). Analogue upright folds in the Sao Francisco Congo Craton deformed margin, Central African Fold Belt (CAFB). Inferences to the Western Gondwana tectonic evolution. , 7(25), -.
NGAKO Vincent; Njonfang Emmanuel; Bernard Julien; Abate Essi Jean Marcel; Yannah Mero; Moussango Ibohn Augustin Patrice; Ntomba Sylvestre; Fodoue Yaya; Itiga Zénon. "Analogue upright folds in the Sao Francisco Congo Craton deformed margin, Central African Fold Belt (CAFB). Inferences to the Western Gondwana tectonic evolution". , 7, 25, 1401, -.
Vincent, NGAKO, Emmanuel, Njonfang, Julien, Bernard, Jean Marcel, Abate Essi, Mero, Yannah, Augustin Patrice, Moussango Ibohn, Sylvestre, Ntomba, Yaya, Fodoue, Zénon, Itiga. (1401). 'Analogue upright folds in the Sao Francisco Congo Craton deformed margin, Central African Fold Belt (CAFB). Inferences to the Western Gondwana tectonic evolution', , 7(25), pp. -.
Vincent, NGAKO, Emmanuel, Njonfang, Julien, Bernard, Jean Marcel, Abate Essi, Mero, Yannah, Augustin Patrice, Moussango Ibohn, Sylvestre, Ntomba, Yaya, Fodoue, Zénon, Itiga. Analogue upright folds in the Sao Francisco Congo Craton deformed margin, Central African Fold Belt (CAFB). Inferences to the Western Gondwana tectonic evolution. , 1401; 7(25): -.

Analogue upright folds in the Sao Francisco Congo Craton deformed margin, Central African Fold Belt (CAFB). Inferences to the Western Gondwana tectonic evolution

زمین ساخت
دوره 7، شماره 25، خرداد 1402    اصل مقاله (3.41 M)
نوع مقاله: مقاله پژوهشی
نویسندگان
NGAKO Vincent1؛ Njonfang Emmanuel* 2؛ Bernard Julien3؛ Abate Essi Jean Marcel4؛ Yannah Mero5؛ Moussango Ibohn Augustin Patrice5؛ Ntomba Sylvestre5؛ Fodoue Yaya5؛ Itiga Zénon6
1Institute of Geology and mining Researches, Yaoundé, Cameroon
2High Teacher Training School, University of Yaoundé I, Yaoundé, Cameroon
3Bureau de Recherches Géologiques et Minières (BRGM), Orléans Cedex 1, France
4Institute of geology and Mining Researches, Yaoundé, Cameroon
5Institute of Geology and Mining Researches, Yaoundé, Cameroon
6Department of Earth Sciences, Faculty of Sciences, University of Douala, Douala, Cameroon
چکیده
Analogue upright folds in the Sao Francisco Congo Craton (SFCC) northern margin overprint an early flat–lying to E–W–directed moderate dipping XY deformation plane outlined by an S1–2 foliation. They display steeply dipping high strain zones (HSZ) parallel to the axial planes of first to fourth–order analogue folds. The HSZ widths are scaled to the fold order: discrete crenulation boundary HSZ scaled to the third and fourth–order folds, thick crenulation boundary HSZ scaled to the first and second ones. The HSZ morphology varies with the structural levels: in the shallow and medium–crustal levels, disjunctive and gradational–type cleavages prevail, whereas discrete and zonal–type mylonitic cleavages are ubiquitous in deeper levels where they interact with the emplacement of granitoids. Z– and S–types crenulation showing boundaries cleavages or HSZ characterize analogue fold limbs, and M–type ones, analogue fold hinges. These structural markers enable to reconstruct the first and second–order fold profiles from the geometry of regional S1–2 foliation trends. The resulting finite–strain pattern materializes D1–2 and D3 interference at global–scale. Two main stress directions are inferred from XY planes and layer–parallel shortening: 1) the N20oE direction correlates with roughly E–W foliation trends marking the earlier nappes stacking episodes upon the SFCC (orogeny 1: 680–620 Ma), and 2) the N120oE direction correlates with meridian–directed nappes stacking episodes upon the West African Craton and F3 fold nappes overprints in CAFB (orogen 2: 600–580 Ma).
کلیدواژه‌ها
Finite– strain pattern؛ High Strain Zone؛ Neoproterozoic fold belts؛ Plates’ collision؛ Orogens 1 and 2
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