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Geochemical Mass Balance and Elemental Transport during the Weathering of the Black Shale of Shuijingtuo Formation in Northeast Chongqing China

机译:重庆东北水井tu组黑色页岩风化过程中地球化学物质平衡与元素运移

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摘要

An understanding of the processes that control the behavior of major elements with respect to weathering profile is essential to calculate the mobility, redistribution, and mass fluxes of elements. Hence, this study aims to determine the geochemical mass balance, strain, elemental correlation, and transport in weathering profiles. We constructed three weathering profiles for the black shale of Shujingtuo formation. As per the principal component analysis of major elements, density, and pH values, the first component represents the “elemental factor” and the second denotes the “external factor.” The “depletion” pattern is a mass transportation pattern, and Na, K, and Mg are depleted along transect relative to the composition of fresh rock. Fe is redeposited at the bottom half of the saprock zone, whereas Al is accumulated at the regolith zone. The Fe and Al patterns are attributed to the “depletion–addition” and “addition” patterns, respectively. The strain in profiles A and B demonstrates the expansion at the regolith zone and part of the saprock zone. In profile C, however, these zones collapsed at all depths. In chemical weathering, Na, K, Ca, Mg, and Si are depleted in the following order: valley (C) > near mountaintop (B) > ridge (A).
机译:对于控制主要元素相对于风化剖面的行为的过程的理解对于计算元素的迁移率,重新分布和质量通量至关重要。因此,本研究旨在确定地球化学质量平衡,应变,元素相关性和风化剖面中的运移。我们为疏井tu组黑色页岩构造了三个风化剖面。根据主要元素,密度和pH值的主成分分析,第一个成分表示“元素因子”,第二个成分表示“外部因子”。 “耗竭”模式是一种大众运输模式,相对于新鲜岩石的组成,Na,K和Mg沿断面损耗。铁重新沉积在边际区的下半部,而铝则积累在重灰岩区。 Fe和Al模式分别归因于“耗尽-添加”和“添加”模式。剖面A和B中的应变显示了在碎屑岩带和部分边缘区域的膨胀。但是,在剖面C中,这些区域在所有深度都坍塌了。在化学风化中,Na,K,Ca,Mg和Si的消耗顺序如下:谷(C)>山顶附近(B)>脊(A)。

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