Mechanisms controlling major and trace element uptake during carbonate mineral formation and diagenetic alteration: An experimental approach

碳酸盐档案的化学和同位素特征反映了矿物形成和/或成岩改造过程中发生的物理化学参数。因此，了解控制碳酸盐中元素和同位素信号分布的物理化学参数是解释其形成和/或转化过程中环境条件的基本要求。然而，到目前为止，从机械上描述控制这些参数的反应和途径的实验研究还很少。本研究基于非晶态和晶态碳酸盐在低温和高温下(反式)形成的实验方法。这项实验工作旨在深入了解(I)文石和镁方解石的高温度分辨水热蚀变、(Ii)白云石的形成和(Iii)有机配体存在下的低温(mg-)ACC(反式)形成的反应机理和途径。为了实现这些目标，我们将通过强有力的(国际)国家合作，使用元素(例如，镁、锶、钡)和同位素特征以及矿物学和(微观)结构特征。

The chemical and isotopic signatures of carbonate archives reflect the physicochemical parameters occurring during mineral formation and/or diagenetic transformation. Thus understanding the physicochemical parameters controlling the distribution of elemental and isotopic signals in carbonates is a fundamental requirement for the interpretation of the environmental conditions occurred during their formation and/or transformation. To date however the experimental studies that mechanistically describe reactions and pathways controlling such parameters are scarce. The present study is based on experimental approaches for the (trans)formation of amorphous and crystalline carbonates at low and elevated temperatures. The experimental work aims to obtain a deep understanding of reaction mechanisms and pathways of (i) high Temperature-resolution hydrothermal alteration of aragonite and Mg calcite, (ii) formation of dolomite, and (iii) low temperature (Mg-)ACC (trans)formation in the presence of organic ligands. To reach these goals we will use elemental (e.g., Mg, Sr, Ba) and isotopic signatures as well as mineralogical and (micro)structural characterisations by strong (inter)national cooperation.