Autor(es):
H. Couto 
Data: 2011
Identificador Persistente: http://hdl.handle.net/10216/52536
Origem: Repositório Aberto da Universidade do Porto
Detalhes do Documento
Minerais de ferro do Ordovícico Inferior do Anticlinal de Valongo
Descrição
The Lower Ordovician oolitic ironstones of Valongo anticline have abundant chamosite and/or siderite. True oolites are rare in the studied levels. Some pseudo-oolites are related to the presence of algae, as evidenced by cathodoluminescence. Iron came from emerged areas and deposited during transgression of Early Ordovician, in a shallow platform protected by barriers, with exhalativesedimentary vent in reducing environment rich in organic matter
The Lower Ordovician oolitic ironstones of Valongo anticline have abundant chamosite and/or siderite. True oolites are rare in the studied levels. Some pseudo-oolites are related to the presence of algae, as evidenced by cathodoluminescence. Iron came from emerged areas and deposited during transgression of Early Ordovician, in a shallow platform protected by barriers, with exhalativesedimentary vent in reducing environment rich in organic matter
Tipo de Documento
Artigo
Idioma Português
Idioma Português
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