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Long-term magmatism in the Ribeira Orogen, Western Gondwana: SHRIMP U-Pb and O isotope data for two Ediacaran-Cambrian magm ... 1 1 Introduction 1 2 Geological setting 2 2.1 The Ribeira Orogen 2 2.2 Costeiro Domain magmatism 4 3 Methods 8 3.1 Compiled data 9 3.2 Analytical methods 10 3.2.1 SHRIMP U-Pb and oxygen isotopes analyses on zircon crystals 10 3.2.2 Lithogeochemistry 10 4 Results 10 4.1 Petrography of the main units 10 4.1.1 Archer orthogneiss – Samples PB-136A e PB-136B 10 4.1.2 Tachas tonalite – Sample PB-138 12 4.1.3 Tonalitic dikes – Sample PB-121 12 4.2 Analytical results 13 4.2.1 U-Pb SHRIMP ages 13 4.2.1.1 Sample PB-136A – Archer orthogneiss 13 4.2.1.2 Sample PB-136B – Porphyritic leucogneiss 13 4.2.1.3 Sample PB-138 – Tachas tonalite 15 4.2.1.4 Sample PB-121 – Tonalitic dike 15 4.2.2 Oxygen isotopes 15 4.2.3 Preliminary geochemical data of magmatic Ediacaran-Cambrian rocks 15 5 Discussion 16 5.1 Reinterpretation of Rio de Janeiro city geological units 16 5.2 Magmatic evolution 17 5.3 Paleogeography of recurrent magmatism 18 5.4 Tectonic evolution 22 6 Conclusion 24 Declaration of Competing Interest 26 Data availability 26 Acknowledgments 26 Appendix A Supplementary

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nonfiction