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Geochemistry of Garga-Sarali intrusive granitoids (central domain of the central African fold belt in Cameroon): petrological implication

机译:Garga-Sarali侵入式花岗岩地球化学(喀麦隆中非折腰带中央领域):岩石效果

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The Garga-Sarali granitoids outcrop in form of large slabs and undistorted large blocks, into a schisto-gneissic basement. These rocks contain mainly muscovite and microcline, followed by K-feldspar, quartz, biotite, pyroxene, zircon and oxides, with coarse-grained to fine-grained textures. Geochemical analysis show that it belongs to differentiated rocks group (granodiorite-granite) with high SiO2 (up to 72 wt%) contents. Their genesis was made from a process of partial melting and fractional crystallization. These rocks are classified as belonging to I- and S-Type, meta-peraluminous, shoshonitic granites; belonging to the domain of volcanic arcs. The rare earth elements patterns suggest a source enriched of incompatible elements. The Nb-Ta and Ti negative anomalies from the multi-element patterns are characteristics of the subduction domains.
机译:Garga-Sarali花岗岩露头以大块的形式和未变形的大块,进入Schisto-神社的地下室。这些岩石主要含有Muscovite和Microcline,其次是K-Feldspar,石英,Biotite,Pyroxene,锆石和氧化物,粗粒于细粒纹理。地球化学分析表明,它属于具有高SiO2(高达72wt%)含量的分化的岩石组(Granodiorite-granite)。它们的成因是由部分熔化和分数结晶的过程制成的。这些岩石被归类为属于I-和S型,荟萃衰弱的舒森花岗岩;属于火山弧的领域。稀土元素模式表明了富裕的元素富集的源。来自多元素图案的Nb-Ta和Ti阴性异常是俯冲域的特性。

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