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New Computerized Method for the Geochemical Classification of Precambrian Carbonate Rocks: Case of a Set of African Cap Carbonates

机译:前寒武纪碳酸盐岩地球化学分类的一种新的计算机化方法:一组非洲帽碳酸盐岩的案例

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Post-sedimentary transformations have masked or completely obliterated the structures and textures of Precambrian carbonate rocks. Therefore, methods of classification of the carbonate rocks founded on the observation of primary structures or textural characteristics are ill-adapted. Consequently, only certain geochemical classification methods allow us to distinguish the various rock-types in the case of Neoproterozoic carbonates. After presenting the most suitable geochemical classifications, we propose a new classification into 14 groups based on a regular ternary diagram with computerized data input. For each sample of carbonate rock, analysis of calcium and magnesium contents allows us to calculate the input data for our diagram i.e. the percentages of Calcite, Dolomite and Insoluble Residue. To automate the application of this diagram, input parameters are created in a descriptive file “Roches.ternaires.txt” using an option called “Ternaires” in the “Diagrammes” software developed by Roland Simler. Thirty cap carbonates of Africa are used to validate this new method.
机译:沉积后的变化掩盖或完全消除了前寒武纪碳酸盐岩的结构和质地。因此,建立在观察一级结构或构造特征基础上的碳酸盐岩分类方法是不合适的。因此,在新元古代碳酸盐岩的情况下,只有某些地球化学分类方法才允许我们区分各种岩石类型。在介绍了最合适的地球化学分类之后,我们根据带有计算机数据输入的常规三元图,将新分类分为14组。对于每个碳酸盐岩样品,钙和镁含量的分析使我们能够计算图表的输入数据,即方解石,白云石和不溶残渣的百分比。为了自动化该图的应用,使用Roland Simler开发的“ Diagrammes”软件中的一个名为“ Ternaires”的选项,在描述文件“ Roches.ternaires.txt”中创建输入参数。非洲使用了三十种碳酸盐岩来验证这种新方法。

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