Neoproterozoic granites of the Lajeado intrusive suite,north-center Brazil: A late Ediacaran remelting of a Paleoproterozoic crust |
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| Institution: | 1. Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Wroc?aw, ul. Podwale 75, Wroc?aw, Poland;2. Institute of Civil Engineering, Poznań University of Technology, ul. Piotrowo 5, 60-965 Poznań, Poland;3. Polish Geological Institute - National Research Institute, ul. Rakowiecka 4, 00-975 Warszawa, Poland;4. CIRES and Department of Geological Sciences, University of Colorado, Boulder, USA;5. Centre of Isotopic Research, All-Russian Geological Research Institute, Sredny prospect 74, 199 106 St. Petersburg, Russia;6. Faculty of Geology, Geophysics and Environmental Protection, AGH – University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland;7. Department of Earth Sciences, Uppsala University, Villavägen 16, 752 36 Uppsala, Sweden;8. St. Petersburg State University, Institute of Earth Sciences, Universitetskaya emb.7/9, 199034 St. Petersburg, Russia;9. Department of Geological Sciences, Indiana University, 1005 East 10th Street, Bloomington, IN 47405, USA;10. Laboratory for Isotope Geology, Swedish Museum of Natural History, P.O. Box 50 007, 10405 Stockholm, Sweden;1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;3. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China;4. Xinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of the Central Asian Orogenic Belt, College of Geology and Mining Engineering, Xinjiang University, Urumqi 830049, China |
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| Abstract: | In north-central Brazil, a number of granite plutons, which intrude Paleoproterozoic gneiss-granulite terrains of the Goiás Massif, crop out along a thermal axis parallel to the Transbrasiliano Lineament. Single zircon lead evaporation ages from three granitic bodies span between 552 and 545 Ma. Sm–Nd model ages (TDM) vary between 2.1 and 1.7 Ga and negative εNd(0.55 Ga) values between ?10 and ?13 show that Paleoproterozoic crust was involved in the genesis of these granites. These plutons, which form the Lajeado Intrusive Suite are part of an important Ediacaran magmatic event in central-northern of the Tocantins Tectonic Province, composed of metaluminous to slightly peraluminous granites with geochemical characteristics similar to A-type granites, whose crystallization occurred under low water activity during magmatic emplacement. The granitic intrusive bodies are related to a crustal extensional/transtensional tectonic event at the end of the Neoproterozoic. They may have connection with the granitic plutons of similar age (0.56–0.52 Ga) in northwestern Ceará state, on the other side of the Paleozoic Parnaíba Basin in northwest of Borborema Province, along the Transbrasiliano Lineament. |
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| Keywords: | Tocantins Province Lajeado Intrusive Suite A-type Granite Sm–Nd model ages Zircon Pb evaporation ages Ediacaran |
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