Geology and LA-ICP-MS U–Pb geochronology of the Nova Brasilândia belt, SW Amazonian Craton: New ages, re-evaluation of existing geochronological data, and implications for the evolution of the Sunsás orogen
作者： Maria Emília Schutesky Della Giustina , Valmir da Silva Souza , Joseneusa Brilhante Rodrigues , Marcos Luiz do Espírito Santo Quadros
DOI: 10.1016/J.JSAMES.2021.103220
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摘要: Abstract New geological and LA-ICP-MS U–Pb geochronological data, combined with literature are used to characterize more precisely the timing of tectonic events in Nova Brasilândia belt southwestern Amazonian Craton, Rondonia, Brazil. The ages zircon crystals were obtained rocks Rio Branco domain southern part belt. They reveal a period sedimentation between 1241 ± 7.5 1137 ± 9 Ma high-grade metamorphism 1137 ± 9 1127.6 ± 2.3 Ma. Mafic-felsic magmatism Suite was dated 1119.7 ± 2.7 1106.2 ± 2.8 Ma. from specific groups recrystallized (cores rims) extracted calc-silicate gneiss (1019 ± 15 Ma), metagabbro (1016.7 ± 3.9 Ma), anatectic granite (1011.3 ± 9.6 Ma) may represent episodes metamorphic recrystallization youngest migmatization. establish two orogenic phases: an accretionary phase approximately 1137 1106 Ma overprinted during final collisional 1096 1011 Ma. orogeny recorded on southwest margin Craton can be described as accretionary-collisional type that developed 1010 Ma.
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