Abstract

Two main morphotypes were studied in the Paleoproterozoic complex of Karelian ministromatolites: columnar active-branched and columnar unbranched. The composition and ultramicrostructures of these morphotypes were analyzed using the Raman spectroscopy. The dolomite and quartz compositions in all of the studied structures were studied. Accessory minerals, such as rutile, fluorapatite, hematite, and phlogopite, were identified. Syngenetic carbonaceous matter (CM) is found in stromatolite layers as repeated dispersion of rounded amorphous carbon clots less than 5 µm in size. Temperature of the metamorphic rock transformation was estimated based on the degree of CM ordering.

中文翻译：

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卡累利阿古元古代微型叠层石的碳质物质

摘要

在卡累利阿小型叠层石的古元古代复合体中研究了两种主要的形态类型：柱状活性分枝和柱状不分枝。使用拉曼光谱分析这些形态类型的组成和超微结构。研究了所有研究结构中的白云石和石英成分。鉴定了金红石、氟磷灰石、赤铁矿和金云母等辅助矿物。在叠层石层中发现同生碳质物质 (CM) 是尺寸小于 5 µm 的圆形无定形碳凝块的反复分散。变质岩转变的温度是根据 CM 有序度来估计的。