Timing of Proterozoic magmatism in the Sunsas belt, Bolivian Precambrian Shield, SW Amazonian Craton

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dc.contributor.authorNedel, Ingrid M.en_ZA
dc.contributor.authorFuck, Reinhardt A.en_Za
dc.contributor.authorRuiz, Amarildo S.en_ZA
dc.contributor.authorMatos-Salinas, Gerardo R.en_ZA
dc.contributor.authorFerreira, Alanielson da C.D.en_ZA
dc.date.accessioned2023-04-18T10:11:52Z
dc.date.available2023-04-18T10:11:52Z
dc.date.issued2021-06-05
dc.descriptionCITATION: Nedel. I. M. et al. 2021. Timing of Proterozoic magmatism in the Sunsas belt, Bolivian Precambrian Shield, SW Amazonian Craton. Geoscience Frontiers 12:(2021) 101247. doi.10.1016/j.gsf.2021.101247en_ZA
dc.descriptionThe original publication is available at: elsevier.comen_ZA
dc.description.abstractWe present new U–Pb zircon and monazite ages from the Sunsas belt granitic magmatism in Bolivia, SW Amazonian Craton. The geochronological results revealed four major magmatic events recorded along the Sunsas belt domains. The older igneous event formed a granitic basement coeval to the Rio Apa Terrane (1.95 – 1.85 Ga) in the southern domain. The second magmatic episode is represented by 1.68 Ga granites associated to the Paraguá Terrane (1.69–1.66 Ga) in the northern domain. The 1.37–1.34 Ga granites related to San Ignacio orogeny represent the third and more pervasive magmatic event, recorded throughout the Sunsas belt. Moreover, magmatic ages of ~1.42 Ga revealed that the granitogenesis associated to the Santa Helena orogeny also affected the Sunsas belt, indicating that it was not restricted to the Jauru Terrane. Lastly, the 1.10–1.04 Ga youngest magmatism was developed during the Sunsas orogeny and represents the final magmatic evolution related to Rodinia assembly. Likewise, the 1.95–1.85 and 1.68 Ga inherited zircon cores obtained in the ~1.3 Ga and 1.0 Ga granite samples suggest strong partial melting of the Paleoproterozoic sources. The 1079 ± 14 Ma and 1018 ± 6 Ma monazite crystallization ages can be correlated to the collisional tectono-thermal event of the Sunsas orogeny, associated to reactions of medium- to high-grade metamorphism. Thus, the Sunsas belt was built by heterogeneous 1.95– 1.85 Ga and 1.68 Ga crustal fragments that were reworked at 1.37–1.34 Ga and 1.10–1.04 Ga related to orogenic collages. Furthermore, the 1.01 Ga monazite age suggests that granites previously dated by zircon can bear evidence of a younger thermal history. Therefore, the geochronological evolution of the Sunsas belt may have been more complex than previously thought.en_ZA
dc.description.versionPublisher’s versionen_ZA
dc.format.extent17 pages : illustrations (some color), mapsen_ZA
dc.identifier.citationNedel. I. M. et al. 2021. Timing of Proterozoic magmatism in the Sunsas belt, Bolivian Precambrian Shield, SW Amazonian Craton. Geoscience Frontiers 12:(2021) 101247. doi.10.1016/j.gsf.2021.101247en_ZA
dc.identifier.issn1674-9871 (online)en_ZA
dc.identifier.otherdoi.10.1016/j.gsf.2021.101247en_ZA
dc.identifier.urihttp://hdl.handle.net/10019.1/126794
dc.language.isoen_ZAen_ZA
dc.publisherElsevier B.V.en_ZA
dc.rights.holderAuthors retain copyrighten_ZA
dc.subjectSunsas belt -- Southwestern Amazonian Cratonen_ZA
dc.subjectBolivian Precambrian Shielden_ZA
dc.subjectU–Pb geochronologyen_ZA
dc.subjectZircon -- Boliviaen_ZA
dc.subjectMonazite -- Boliviaen_ZA
dc.subjectGeology, Stratigraphic -- Proterozoicen_ZA
dc.subjectMagmatism -- Southwestern Amazonian Cratonen_ZA
dc.titleTiming of Proterozoic magmatism in the Sunsas belt, Bolivian Precambrian Shield, SW Amazonian Cratonen_ZA
dc.typeArticleen_ZA
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