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首页> 外文期刊>Acta Geologica Sinica - English Edition >Magnetic Characterization of Amphibolites from the Fomopéa Pluton (West Cameroon): Their Implication in the Pan-African Deformation of the Central African Fold Belt
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Magnetic Characterization of Amphibolites from the Fomopéa Pluton (West Cameroon): Their Implication in the Pan-African Deformation of the Central African Fold Belt

机译：Fomopéa冥王星（喀麦隆西部）的两栖生物的磁性特征：对中非褶皱带泛非洲变形的影响

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摘要

The Fomopea granitic pluton is emplaced in gnessic and amphibolitic basement. These gneissic and amphibolitic basement rocks are represented in the pluton's body as sub-rounded, elongated or stretched xenoliths. Amphibolitic xenoliths display testimonies of two main tectonic events namely: (i) E1 flattening deformation event characterized by a NW-SE to E-W foliation with a best pole at 246/57 and a mineral stretched lineation with a best line at 293/47; and (ii) E2 compressive event typified by (1) N-S to NNE-SSW steeply dipping foliation; (2) S-type flexion-fold indicating a sinistral shear movement. These amphibolite rocks indicate a magnetic susceptibility magnitude (Km) range from 418 μSI to 90092 μSI for 87% of the stations showing a ferromagnetic behavior. K-T curves reveal the presence of Ti-poor magnetite as susceptibility mineral carrier. Magnetic foliation and lineation suggest that the N-S strike direction observed in the Bamendou amphibolite is, as pointed out elsewhere in the Central African Fold Belt, of paramount importance in the tectonic evaluation of the Fomopea area, since it has most likely acted as major deformation phase in the second tectonic event in the belt.
机译：Fomopea花岗岩岩体位于吉尼斯和两性基底中。这些片麻岩和闪石基底岩在岩体中表现为亚圆形，拉长或伸展的异岩。闪石质的异质岩显示出两个主要的构造事件的证词：（i）E 1 展平变形事件，其特征是从NW-SE到EW的叶面，其最佳极点在246/57，且矿物伸展的衬层具有最佳线为293/47； （ii）E 2 压缩事件，其典型特征是（1）N-S到NNE-SSW陡倾叶型； （2）S型屈曲，表示左侧剪切运动。这些闪石岩表明87％的站显示铁磁行为，其磁化率（Km）范围从418μSI到900092μSI。 K-T曲线揭示了贫钛磁铁矿作为磁化矿物载体的存在。磁叶性和线性表明，正如在中非褶皱带的其他地方所指出的，在Bamendou闪石中观察到的NS走向在Fomopea地区的构造评价中至关重要，因为它很可能是主要的变形阶段。在该带的第二次构造事件中。

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