PALEOPROTEROZOIC MINISTROMATOLITES OF KARELIA: STRUCTURE AND COMPOSITION

• Published in: Proceedings of the Karelian Research Centre of the Russian Academy of Sciences
• Main Authors: Оксана Мураткуловна Джамансартова, Oksana Dzhamansartova
• Format: Article in Journal/Newspaper
• Language: English; Russian
• Published: Karelian Research Centre of the Russian Academy of Sciences 2019
• Subjects: министроматолиты; карелия; морфология; классификация; рамановская спектроскопия; биогенность; углеродистое вещество; Science; Q; karelian
• Online Access: https://doi.org/10.17076/geo863; https://doaj.org/article/eca358c6a77d45a493dfb14b2c6c4741

The main subdivisions among the most widespread column types in the Paleoproterozoic complex of Karelian ministromatolites were identified based on their characteristic morphological features. That helps to refine the classification of the class Ministromatophyceae (ministromatolites) and systematize the available material. Individual petrographic thin sections with ministromatolites were analyzed by the Raman scattering method. The results show the rock composition and the morphology details of clotted material. Morphologically, structures found in the clotted material can be compared to modern cyanobacteria, suggesting the structures are biogenic. The spectra of carbonaceous material in their composition support this point of view.