Dolomite pipes in the Crato Formation fossil lagerstätte (Lower Cretaceous,Aptian), of northeastern Brazil |
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| Institution: | 1. Instituto D. Luiz, Departamento de Geociências, ECT, Universidade de Évora, Portugal;2. Instituto de Ciências da Terra de Évora, Departamento de Geociências, ECT, Universidade de Évora, Portugal;3. Centro de Investigação em Ciência e Engenharia Geológica, Universidade Nova de Lisboa, Portugal;4. Instituto D. Luiz, Departamento de Geologia, Faculdade de Ciências da Universidade de Lisboa, Portugal;5. Departamento de Geologia, Universidad de Salamanca, Spain;6. Senckenberg Naturhistorische Sammlungen Dresden, Museum für Mineralogie und Geologie, Germany;1. Department of Geology and Geochemistry, Faculty of Sciences, Universidad Autónoma de Madrid, 28049, Madrid, Spain;2. Department of Petrology and Geochemistry, Universidad Complutense, c/ Jose Antonio Novais 2, 28040, Madrid, Spain;3. Department of Earth and Marine Sciences, Palermo University, Via Archirafi 36, 90123, Palermo, Italy;4. Department of Stratigraphy, Universidad Complutense, c/ Jose Antonio Novais 2, 28040, Madrid, Spain |
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| Abstract: | Pipe-like structures filled with massive and brecciated Fe-rich dolomites occur within a 5–6 m sequence of otherwise horizontal, millimetre-laminated limestones of the Nova Olinda Member of the Crato Formation (Aptian, Lower Cretaceous) of north east Brazil. The pipe-fills predate compaction, contain hydro-brecciated host strata, developed penecontemporaneously with a carbonate laminite, and may represent methane seeps. Such seeps may have developed above buried topographic highs as fluids emanating from deeper strata migrated along buried discontinuities such as the basement/Cretaceous unconformity and buried faults in the basement. |
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