现代碳酸盐叠层石的重要进展及意义

张薇

Important Development and Significance of Modern Carbonate Stromatolites

Wei Zhang

图3 巴西 Lagoa Vermelha 现代碳酸盐叠层石的总体特征[29] (a)微生物席形成的叠层石的横切面，表现为已石化的碳酸盐沉淀物构成的白色纹层和未石化的有机质层的交替，纹层1为蓝细菌主导的绿色层，纹层2为异养细菌主导的棕色层，纹层3为紫色硫细菌主导的红色层；(b)由较底层的细菌组成的样本，这一层显示出微红色，是紫色硫细菌的象征

Fig.3 Images showing general features of modern carbonate stromatolites in Lagoa Vermelha, Brazil[29] (a)The cross section of stromatolites formed by the microbial mat shows alternating layers of white laminae composed of fossilized carbonate sediments with layers of unfossilized organic matter. Layer 1 is the green layer dominated by cyanobacteria, layer 2 is the brown layer dominated by heterotrophic bacteria, and layer 3 is the red layer dominated by purple sulfur bacteria; (b) A sample of bacteria from the lower layer, this layer shows a reddish tint, the symbol of purple sulfur bacteria