What are the different styles of calcite precipitation within a hyperalkaline leachate? A sedimentological Anthropocene case study

What are the different styles of calcite precipitation within a hyperalkaline leachate? A sedimentological Anthropocene case study
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高碱性渗滤液中的方解石沉淀有哪些不同类型?

DOI:
10.1002/dep2.168
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发表时间:
2021
期刊:
The Depositional Record
影响因子:
--
通讯作者:
Bastianini L
Bastianini L
中科院分区:
--
文献类型:
--
作者:
Bastianini L

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本研究的目的是比较石灰和钢铁处置场下游的人为碳酸盐的结构与自然系统的碳酸盐沉淀模型,以阐明潜在的驱动因素,沉淀机制,形态相似性,可预测性,这些系统的3D相分布和沉积模型。为此,综合运用沉积学、矿物学和地球化学方法,包括微相分析(岩相显微镜和电子显微镜)、X射线衍射和水化学。数据表明,人类和自然系统都表现出明确的近端,中间和远端碳酸盐沉淀区。主要的宏观差异是近端区域沼泽环境占主导地位,而中部和远端区域则普遍存在凝灰岩状拦河坝和水池层序。人类活动场所中的微组构与古生物相当,但缺乏亚表层相,在极端pH值下,微组构显示出亮晶结壳,而古生物中没有明显的对应物。这种人为碳酸盐的沉积学表明,方解石矿物的形成是复杂的,而不是均匀的或纯粹由热力学过程驱动的。考虑这些人为系统的沉积学将有助于我们理解降水机制,这将有助于利用人为碱性废物进行碳捕获和管理其环境影响。
This study aims to compare the fabrics of anthropogenic carbonates downstream of lime and steel disposal sites with models of carbonate precipitation from natural systems to elucidate potential drivers, precipitation mechanisms, morphological similarities, predictability in 3D facies distributions and depositional models of these systems. For this purpose, a combination of sedimentological, mineralogical and geochemical approaches is conducted including the analysis of microfacies (petrographic microscope and electron microscopy), X‐ray diffraction and hydrochemistry. The data show that both anthropogenic and natural systems exhibit clear proximal, middle and distal zones of carbonate precipitation. The main macroscopic differences are the dominance of swamp environments in the proximal zone and the prevalence of tufa‐like barrage‐and‐pool sequences in the middle and distal zones. Microfabrics in anthropogenic sites are comparable to travertines but lack the sub‐surface facies and at extreme pH exhibit sparry crusts without clear equivalents in travertines. This sedimentology of anthropogenic carbonates shows that calcite mineral formation is complex and not homogeneous or purely driven by thermodynamic processes. Considering the sedimentology of these human‐induced systems will help us understand precipitation mechanisms which will aid both efforts to utilise anthropogenic alkaline wastes for carbon capture and manage their environmental impacts.
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镁的作用。
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