DOI: 10.1007/s00531-015-1288-6
Scopus记录号: 2-s2.0-84951824094
论文题名: Structural characterization of the Misajé granitic pluton (NW Cameroon): constraints from magnetic and field observations
作者: Fozing E.M. ; Njanko T. ; Naba S. ; Kwékam M. ; Njonfang E. ; Rochette P.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2016
卷: 105, 期: 8 起始页码: 2285
结束页码: 2309
语种: 英语
英文关键词: AMS
; Cameroon
; Granite
; Nkambé
; Pan-African
Scopus关键词: amphibolite
; crystallization
; deformation
; emplacement
; foliation
; host rock
; magnetic field
; petrography
; pluton
; strike-slip fault
; tectonic evolution
; Cameroon
英文摘要:
The Misajé granitic pluton, emplaced between 569 and 560 Ma in an amphibolitic and gneissic host rock, comprises four petrographic units namely biotite-hornblende granite (BHG), granodiorite (Gd), biotite granite (BG), and leucocratic granite (LG). Four major tectonic events have been described in the studied area: a D1-early tectonic event, responsible of the E–W flat foliation which has been progressively transposed by a D2 tectonic event. A D2 event has developed heterogeneous simple shear in a dextral transpressive context with moderate to strong dipping NE–SW striking foliation; a D3 tectonic event has lead to a sinistral N–S ductile shear characterized by N- to ENE-striking foliation and E–W strike-slip shear corridors and a D4 tectonic event that developed N–S dextral ductile strike-slip deformation. The magnetic study of the pluton, based on the AMS parameters, reveals the coexistence of both paramagnetic (dominated by iron-bearing silicates; 54 % of sites) and ferromagnetic (due to the occurrence of PSD and MD grains of magnetite or other ferromagnetic minerals; 46 % of sites) behaviors. Magnetic foliation shows best poles at 55/82 for the whole pluton, 95/32 in BHG, and 273/83 in BG, and the magnetic lineation trends are mostly NNE–SSW with best lines at 210/8, 198/19, and 36/3, respectively. The trend of the magnetic lineation in BG indicates an S-shape trajectory, suggesting a sinistral sense of shear motion along discrete E–W corridors situated at the northern and southern ends. Kinematic indicators in BG point to a sinistral sense of shear, suggesting its emplacement during the D3 event. The close relationship between K1 and K3 points to a syn-kinematic emplacement and crystallization of the Misajé granitic pluton during the Pan-African event, and the tectonic evolution of the study area is considered to be coeval with the tectonic evolution of the trans-Saharan Pan-African belt of eastern Nigeria. © 2015, Springer-Verlag Berlin Heidelberg.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84951824094&doi=10.1007%2fs00531-015-1288-6&partnerID=40&md5=0aedaf6aa995fa064db5e02f6a70ea68
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70105
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Laboratory of Environmental Geology, University of Dschang, P.O. Box 67, Dschang, Cameroon; Ministry of Scientific Research and Innovation, DPSP/CCAR, P.O. Box 1457, Yaoundé, Cameroon; Laboratory of Geosciences and Mining Environment, University of Ouagadougou, Ouagadougou, Burkina Faso; Laboratory of Geology, ENS, University of Yaoundé I, P.O. Box 47, Yaoundé, Cameroon; UMR 6635-CEREGE, Aix-en-Provence, France
Recommended Citation:
Fozing E.M.,Njanko T.,Naba S.,et al. Structural characterization of the Misajé granitic pluton (NW Cameroon): constraints from magnetic and field observations[J]. International Journal of Earth Sciences,2016-01-01,105(8)