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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Concentrations of major and trace elements in soil profiles developed over granites across a climosequence in northeastern Brazil
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Concentrations of major and trace elements in soil profiles developed over granites across a climosequence in northeastern Brazil

机译：在巴西东北部的升高的土壤剖面中的主要和微量元素浓度

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Soils formed from granites are distributed worldwide, therefore, studies regarding their geochemical signature on tropical soils are important to understand key processes of soil weathering and soil chemistry. This paper reports the effect of S- and I-type granitic rocks on the content and distribution of trace and major elements in soil profiles developed across a climosequence in Northeastern Brazil. In general, soils developed from I-types show greater trace and major element concentrations than those originated from S-types, due to their higher proportion of accessory and mafic minerals. Geochemical mass balance and enrichment factor data suggest that climatic effects showed a less evident effect on the distribution pattern of trace and major elements from soil profiles underlain by S-type granitic rocks. The highest enrichment factor results evidenced in soils formed on I-types are explained by the rock mineralogy, which imparts higher CEC values and proportion of clay to soils. Trace elements were less leached than major elements during chemical weathering, except for Al, Fe, and P. Geochemical mass balance showed that, regardless of the granite type, the highest depletion of trace and major elements in the pedosphere took place in the humid zones as a consequence of weathering intensity. In this zone, except for quartz, the primary minerals were altered to form secondary minerals, giving rise to kaolinitic soils. These results can be used as reference contents of trace and major elements developed from different granitic rocks in environments with tropical climate. Besides, this research sheds some light on the effect of contrasting granites and a climosequence on soil geochemistry.
机译：由花岗岩形成的土壤在全球范围内分布，因此，对热带土壤的地球化学签名的研究非常重要，了解土风化和土壤化学的关键过程。本文报告了S-和I型花岗岩岩石对巴西东北部升高的土壤剖面中痕量和主要元素的含量和分布的影响。通常，由于其较高比例和乳头矿物质的比例，从I型类型中发育的土壤显示出更大的痕量和主要元素浓度，而不是S系列的浓度。地球化学质量平衡和富集因子数据表明，气候效应对S型花岗岩岩石下划线的土壤剖面的分布模式和主要元素的分布模式表现出不太明显的影响。在I-型岩石中形成的土壤中明确的最高的富集因子结果由岩石矿物解释，其赋予较高的CEC值和粘土比例。除了Al，Fe和P.地球化学质量平衡外，除了Al，Fe和P.无论花岗岩型，痕量的痕迹，除了花岗岩类型，痕量的痕量，痕量的元素均不得浸出。由于风化强度的结果。在该区域中，除了石英外，初级矿物质被改变以形成二次矿物质，产生高岭土土壤。这些结果可用作热带气候环境中的不同花岗岩岩石开发的痕量和主要元素的参考含量。此外，这项研究揭示了对比花岗岩和升高土壤地球化学的影响。

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