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首页> 外文期刊>Geosciences >Geochemical Features of the Weathered Materials Developed on Gabbro in a Semi-Arid Zone, Northern Cameroon
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Geochemical Features of the Weathered Materials Developed on Gabbro in a Semi-Arid Zone, Northern Cameroon

机译：喀麦隆北部半干旱地区加布布罗开发的风化材料的地球化学特征

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摘要

Investigation on the mobilization and the redistribution of major, trace and rare-earth elements (REE) was performed along a soil profile developed on gabbro in the semi-arid zone (Northern Cameroon), using mineralogical and geochemical analyses. The gabbro has high contents in Ba, Cr, V, Sr, Ni, Zn, Zr, Cu, Co and Sc. The total REE content is 49 mg/kg with strong light rare-earth elements (LREE) abundance. The Ce/Ce* and Eu/Eu* ratios are very close to 1 (0.98 and 1.02 respectively) and the (La/Yb) N ratio is very low (1.48). The weathering of the bedrock leads to the differentiation of coarse saprolite, fine saprolite, loamy clayey horizon and humiferous horizon. Among trace elements, Cr and Zr concentrations range between 50 and 150 mg/kg; Ga, Y, Co, Cu, Ni and Sc concentrations vary between 50 and 150 mg/kg while those of Cs, Hf, Nb, Rb, Sn, Ta, Th, U and Pb are below 5 mg/kg. The total REE contents vary from 62.52 to 78.81 mg/kg, with strong LREE abundance. The values of the (La/Yb) N ratio (~1.04–1.59) is low and indicate the low REE fractionation. Negative Ce anomaly (Ce/Ce* ~ 0.86) and positive Eu anomalies (Eu/Eu* ~ 1.22) are observed respectively in the middle part and the whole soil profile. Mass balance calculation reveals the leaching of Ca, Mg, K, Ba, Cr, Rb, Co, Cu, Ni, Al, Cs, Sr, U and V, and accumulation of Si, Fe, Ti, Mn, Na, P, Ga, Hf, Nb, Sn, Ta, Y, Zr, Sc, Zn and REE during the weathering.
机译：利用矿物学和地球化学分析，研究了半干旱地区（喀麦隆北部）长辉羚生长的土壤剖面上主要，微量和稀土元素（REE）的动员和再分配。辉长岩中的Ba，Cr，V，Sr，Ni，Zn，Zr，Cu，Co和Sc含量很高。稀土元素的总含量为49 mg / kg，具有丰富的轻稀土元素（LREE）。 Ce / Ce *和Eu / Eu *的比率非常接近1（分别为0.98和1.02），并且（La / Yb）N比率非常低（1.48）。基岩的风化作用导致了粗腐泥土，细腐泥土，壤质黏土层和腐殖质层的分化。在痕量元素中，Cr和Zr的浓度范围在50至150 mg / kg之间。 Ga，Y，Co，Cu，Ni和Sc的浓度在50至150 mg / kg之间变化，而Cs，Hf，Nb，Rb，Sn，Ta，Th，U和Pb的浓度低于5 mg / kg。稀土元素的总含量从62.52到78.81 mg / kg不等，LREE含量很高。 （La / Yb）N比值（〜1.04-1.59）较低，表明REE馏分较低。在土壤中部和整个土壤剖面分别观察到负Ce异常（Ce / Ce *〜0.86）和正Eu异常（Eu / Eu *〜1.22）。质量平衡计算表明，Ca，Mg，K，Ba，Cr，Rb，Co，Cu，Ni，Al，Cs，Sr，U和V的浸出以及Si，Fe，Ti，Mn，Na，P，在风化过程中，Ga，Hf，Nb，Sn，Ta，Y，Zr，Sc，Zn和REE。

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