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As regioes de Morro Azul e de Morro Grande no leste do Parana abrigam exposicoes de estromatolitos, compostos por formas colunares e esteiras microbianas na Formacao Capiru do Grupo Acungui de idade Proterozoica. Estes estromatolitos estao associados a metadolomitos e indicam provavel controle microbiano na geracao de dois diferentes grupos: a) esteiras microbianas na regiao de Morro Azul e b) estromatolitos colunares na regiao de Morro Grande. Os estromatolitos colunares possuem ate 35 cm de altura por 15 cm de diâmetro, ocorrem em colunas simples ou ramificadas, geralmente associadas a estruturas sedimentares plano-paralelas e a marcas de onda. Em planta, os estromatolitos sao elipsoidais a circulares, onde a laminacao interna se apresenta de ondulada a moderadamente convexa. As esteiras microbianas sao compostas de uma sucessao de lâminas finas associadas a estruturas caracteristicas de exposicao subaerea como tepees e gretas de contracao. As caracteristicas morfologicas das estruturas estromatoliticas, associadas as estruturas sedimentares observadas nas diferentes litofacies, permitem caracterizar distintos ambientes de plataforma para as duas regioes: para a de Morro Azul, um ambiente de supramare; enquanto para a de Morro Grande, um ambiente variando de entremares a inframare. CHARACTERIZATION OF STROMATOLITES IN THE CAPIRU FORMATION (PROTEROZOIC) IN THE MORRO AZUL AND MORRO GRANDE REGIONS: EASTERN PARANA Abstract The Morro Azul (regiao de Morro Azul) and the Morro Grande (regiao de Morro Grande) regions in eastern Parana contain columnar stromatolites and microbial mats in the Capiru Formation of the Acungui Group of Proterozoic age. These structures are associated with metadolomites, indicating probable microbial control in the formation of two different groups of stromatolites: a) columnar stromatolites in regiao de Morro Grande and b) microbial mats in the regiao de Morro Azul. Columnar stromatolites reach up to 35 cm in height and 15 cm in diameter as columns or branched generally associated with plane-parallel sedimentary structures and wave marks. In cross-section, the stromatolites are elliptical to circular, and the lamination is wavey to moderately convex. The microbial mats are composed of a succession of fine laminal associated with structures characteristic of subaerial exposure, such as tepees and mud cracks. The morphlogic features of the stromatolites and the observed sedimentary structures in the different lithofacies suggest distinct shelf environments for the two regions: for regiao de Morro Azul, a supratidal facies, while in the regiao de Morro Grande, an environment varying from intertidal to infratidal.

CARACTERIZAÇÃO DOS ESTROMATÓLITOS DA FORMAÇÃO CAPIRU (PROTEROZÓICO) NAS REGIÕES DE MORRO AZUL E MORRO GRANDE: LESTE DO PARANÁ