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在黑页岩气候变化期间稀土元素的移动性和分化:酸性岩石排水和顺序提取研究研究的含义

Nengqiu Wu¹, Bo Peng¹, Albert Juhasz²

¹School of Geographic Sciences, Hunan Normal University, Changsha 410081, People's Republic of China; Key Laboratory of Environmental Heavy-Metal Contamination and Ecological Remediation, Hunan Normal University, Changsha 410081, People's Republic of China.

The Science of the total environment

|September 15, 2024

概括

黑页岩气候变化释放稀土元素 (REEs) 进入酸性岩石排水 (ARD). 这项研究揭示了在这个过程中整合动员和优先释放REE,特别是中等REE.

科学领域:

地质化学地质化学
环境科学环境科学
矿物学是什么?矿物学是什么?

背景情况:

黑页岩是富含稀土元素 (REEs) 的沉积岩.
由于经济和环境原因,了解黑页岩气候变化期间的REE流动性至关重要.
酸性岩石排水 (ARD) 是与矿物气候变化相关的重大环境问题.

研究的目的:

分析ARD中的REE度和模式以及来自黑页岩气候变化的相关材料.
为了阐明在黑页岩气候变化期间控制REE流动性的地化学过程.
在ARD系统中提出REE流动性和分布的模型.

主要方法:

在酸性岩石排水 (ARD),新鲜和经过气候变化的黑页岩和衍生土壤中分析 REE.
顺序提取技术以确定REE分布在黑色页岩的不同矿物分量中.
对REE模式的地球化学分析,包括NASC规范化和异常计算 (Ce/Ce*,Y/Y*).

主要成果:

在ARD (1624074μg/L) 中发现了总REEs+Y (REY) 的高度.
ARD样本表现出明显的NASC规范化模式,中等REE (MREE) 丰富度和负Ce,正Y异常.
ARD中的REEs来源于可交换和氧化铁分数,分别有MREE和HREE的优先释放.

结论:

地化学过程包括集成的REE动员 (矿物溶解,硫化物氧化) 和优先释放 (酸性流体效应).
提出了一个新的模型来解释REE在黑页岩气候变化和ARD中的移动性和分布.
这些发现对于理解自然和人为系统中的REE行为至关重要.

关键词:

酸性岩石排水酸性岩石排水黑色页岩气候变化黑色页岩气候变化综合动员整合动员享有优先释放的权利.在REE的流动性.稀土元素 (REEs) 是一种稀土元素.

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