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Characteristics and mechanisms of multistage dolomitization in Proterozoic dolomitic breccia from Água Clara Formation, Ribeira Belt, Brazil

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Abstract

The Proterozoic carbonate rocks from Ribeira Belt in Rio Bonito Quarry, Southern Brazil, seem to evidence an intense hydrothermal alteration prominently indicated by three distinct dolomitization stages followed by a later dedolomitization one. This observation prompted a detailed study of the mineral phases derived of these processes, the carbonates involved in such, and the implications therein regarding the characterization of the hydrothermal dolomitization. Different phases of basinal, hydrothermal-magmatic, metamorphic and meteoric fluids were responsible by the crystallization of six distinct generations of dolomite in multistage events, which comply with different dolomitization models in literature. First, Mesoproterozoic limestones, from shallow to deep water platforms, were dolomitized (burial compaction model) by the replacement of diagenetic calcite with dolomites through the interaction of marine and basinal fluids. In pressure relief zones, the formation of the first gap-filling dolomite represented the sedimentary–metamorphic transition. During the Brasiliano–Pan African orogeny, the second dolomitization phase (tectonic model) occurred generating dolomite, inducing hydraulic fracturing and afterwards, yet another, precipitation of dolomite on the edges of fragments—thus forming a dolomitic breccia. The precipitation of the second gap-filling sample of dolomite took place simultaneously to the tectonic dolomitization phase and the hydraulic brecciation. During the third dolomitization stage (thermal convection model), hydrothermal-granitic fluids promoted the precipitation of saddle dolomite, infilling vugs. Subsequently, the dedolomitization process (thermal convection/meteoric model) ascribed to hydrothermal-granitic and meteoric fluids induced calcite, quartz, fluorite and apatite’s crystallization, infilling vugs in the dolomitic breccia.

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(Source Rock). Field 2—Field with contribution of hydrothermal magmatic (PTG), metamorphic fluids and lesser fluid–rock interaction. Field 3—Contribution of meteoric, hydrothermal-magmatic fluids and intermediate fluid–rock interaction. Field 4—Field of greater salinity with contribution of hydrothermal-magmatic fluids, meteoric fluids, and superior fluid–rock interaction.

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Acknowledgements

The authors would like to thank PETROBRAS and ANP for the research’s incentive, to UFPR for the infrastructure; to the laboratories: LAMIR and CME, in special to Deonir Agustini and Gabriel Metzger, for the analysis and assistance in data processing. As well as, to the Cement Company Itambe’s Mining Engineer, for allowing access to Rio Bonito Quarry and to Frederico Sousa Guimarães, Pamela Caron and Malu Martins for technical support. We are also grateful to Dr. James W. LaMoreaux and all the reviewers from the journal for the suggestions and criticism that substantially improved the quality of this paper.

Funding

This endeavor was supported by the TRD Project (Tipology of Dolomitized Reservoirs), an agreement between PETROBRAS, ANP and UFPR (Grant ID 0050.0101319.16.9).

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Correspondence to Murilo Henrique Taques Camargo.

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All the authors have been actively involved with this work. Murilo H. T. Camargo, André D. Ferreira, Cristina V. Pinto-Coelho, Lucilia A. R. de Oliveira, Marcella L. Cavallari, Lorena de Filippis Alfaro, Alberto C. Botelho, Júlio T. Brita, Cláudio N. Lamarão, Gisele T. Marques, and Eduardo Roemers-Oliveira were involved in writing this manuscript.

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All the authors have approved the manuscript, and agreed to its submission. Murilo H. T. Camargo, André D. Ferreira, Cristina V. Pinto-Coelho, Lucilia A. R. de Oliveira, Marcella L. Cavallari, Lorena de Filippis Alfaro, Alberto C. Botelho, Júlio T. Brita, Cláudio N. Lamarão, Gisele T. Marques, and Eduardo Roemers-Oliveira.

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Camargo, M.H.T., Ferreira, A.D., Pinto-Coelho, C.V. et al. Characteristics and mechanisms of multistage dolomitization in Proterozoic dolomitic breccia from Água Clara Formation, Ribeira Belt, Brazil. Carbonates Evaporites 37, 30 (2022). https://doi.org/10.1007/s13146-022-00780-7

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