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首页> 外文期刊>Open Journal of Geology >Petrography and Mineralogy of the Quartz and Quartz-Feldspar Sulphide Veins in the Pan-African Syenitic Massif of Guider (North Cameroon)
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Petrography and Mineralogy of the Quartz and Quartz-Feldspar Sulphide Veins in the Pan-African Syenitic Massif of Guider (North Cameroon)

机译：石英和石英长石的岩石和矿物学在导向器的泛非洲Syenitic MaseIf中的石英和石英 - 硫化物静脉（北喀麦隆）

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摘要

In the syenitic pluton of Guider (593 ± 4 Ma) in the North-West Cameroon domain of Central African Fold Belt, mineralized N-S to NE-SW vertical or sub-vertical quartz and quartz feldspar veins has been recently identified. In this contribution, we present petrography and mineralogy of these veins, in order to constrain their genesis and emplacement mechanisms based on detailed field work, petrographic studies and chemical characterization of minerals by using an electron probe microanalyser (EPMA). Field observations and vein microstructures show that the emplacement of the veins has been controlled by the dextral N-S trending strike-slip shear zones related to the regional D2 deformation phase. The results of mineralogical analysis reveal the co-presence of silicates and metallic minerals that include magnetite, ilmenite, pyrite, bismuthite, galena (very rare) and sulphide complexes (BiPbS, BiAgPbS, FeBiPbCuS, BiFe(TeS), FeBiPbS, BiPbCuS). The gangue is represented by quartz (quartz 1, quartz 2 and quartz 3), feldspars, sericite, chlorite, yellowish brown clay minerals, and hematite. The textural relationships between sulphides, quartz and alteration products show that the mineralization is essentially syn- to late-D2 and suggest that syenitic country rock and dextral shear zones have played an important role in the metallogenesis of these veins. This mineralization shows characteristics for copper-bearing calc-alkaline deposits, but differs from these by its more extensive alteration and its abundance in hematite. Substitutions of Al(IV) by Si(IV) in sericite associated with the sulphide mineralization and cataclastic deformation suggest that the temperature of trapping of the fluids is between 230 ° C and 275 ° C.
机译：在中非折叠皮带的西北喀麦隆领导者（593±4 mA）的Guergitic芦苇中，最近已经确定了矿化N-S至Ne-SW垂直或亚垂直石英和石英长石静脉。在这一贡献中，我们提出了这些静脉的岩画和矿物学，以根据使用电子探针微肛交晶片（EPMA）来限制其基于详细的现场工作，岩体研究和矿物学的化学表征的成因和施加机制。场观测和静脉微观结构表明，静脉的施加由与区域D2变形相相关的右侧N-S趋势趋势防滑剪切区控制。矿物学分析结果揭示了硅酸盐和金属矿物的共同存在，包括磁铁矿，伊尔梅钛矿，黄铁矿，铋矿石，高级胶质纳（非常罕见）和硫化物络合物（BIPBS，BiagPBS，FeBipcus，Bife（TES），FeBIPBS，Bipcus）。煤矸石由石英（石英1，石英2和石英3），长石，绢云母，氯酸盐，黄棕色粘土矿物和赤铁矿表示。硫化物，石英和改变产品之间的纹理关系表明，矿化基本上基本上是D2的态度，并表明，Syenitic乡村岩石和右旋剪切区在这些静脉的成矿中发挥着重要作用。该矿化显示铜钙碱沉积物的特性，但通过其更广泛的改变及其在赤铁矿中的丰富而不同。与硫化物矿化和调节变形相关的Si（IV）中的Al（IV）的取代表明，流体捕获的温度在230＆＃176之间; C和275＆＃176; C。

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