Author(s):
H. Couto 
Date: 2011
Persistent ID: http://hdl.handle.net/10216/52536
Origin: Repositório Aberto da Universidade do Porto
Document details
Minerais de ferro do Ordovícico Inferior do Anticlinal de Valongo
Description
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
Document Type
Article
Language Portuguese
Language Portuguese
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