U–Pb and Hf isotopes in granitoids from the Eastern Bolivian basement: Insights into the Paleoproterozoic evolution of the western part of South America

From microanalysis to supercontinents: Insights from the Rio Apa Terrane into the Mesoproterozoic SW Amazonian Craton evolution during Rodinia assembly

“…1.67 Ga on the basis of whole‐rock Rb–Sr ages, interpreted to record a medium‐ to high‐grade metamorphic event inferred to be related to amalgamation of the RAT (Cordani et al, 2010). This interpretation has been adopted in the subsequent literature and has been used to support tectonic reconstructions of the RAT within Nuna and Rodinia (Lacerda Filho et al, 2016, 2020; Redes et al, 2020; Teixeira et al, 2020). K–Ar and 40 Ar/ 39 Ar dating across the RAT demonstrated the existence of a regional thermal event at c .…”

“…The RAT is currently separated from the SW Amazonian margin by the Paraguá Terrane and Neoproterozoic belts (e.g., Tucavaca Belt; Figure 1 (Nedel, 2020;Nedel et al, 2021;Redes et al, 2020) (Figure 14A). The Chiquitania Group, a metasedimentary unit of the Paraguá Terrane intruded by the Lomas Maneches Suite, is characterized by detrital zircon U-Pb ages spanning 1910-1690 Ma with a peak of c. 1765 Ma (Boger et al, 2005).…”

“…It is proposed that the RAT consolidated as a single coherent and stable tectonic unit at c. 1.67 Ga on the basis of whole-rock Rb-Sr ages, interpreted to record a medium-to high-grade metamorphic event inferred to be related to amalgamation of the RAT (Cordani et al, 2010). This interpretation has been adopted in the subsequent literature and has been used to support tectonic reconstructions of the RAT within Nuna and Rodinia (Lacerda Filho et al, 2016Redes et al, 2020;Teixeira et al, 2020). K-Ar and 40 Ar/ 39 Ar dating across the RAT demonstrated the existence of a regional thermal event at c. 1,300 Ma (Araújo et al, 1982;Cordani et al, 2010;Lacerda Filho et al, 2020), which is also identified in metamorphic monazite (Lacerda Filho et al, 2016).…”

“…The composite Paragu a Terrane has two domains (Paragu a and San Diablo) separated by a shear zone termed the San Diablo Front. Recent investigations in the San Diablo domain (southern domain of the Paragu a Terrane) have revealed the existence of Palaeoproterozoic meta-igneous rocks with whole-rock Sm-Nd and zircon U-Pb-Hf signatures similar to the Western domain of the RAT (Nedel, 2020;Nedel et al, 2021;Redes et al, 2020) (Figure 14a). The Chiquitania Group, a metasedimentary unit of the Paragu a Terrane intruded by the Lomas Maneches Suite, is characterized by detrital zircon U-Pb ages spanning 1910-1,690 Ma with a peak of c. 1,765 Ma (Boger et al, 2005).…”