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Precise ID-TIMS U–Pb baddeleyite ages (1110–1112 Ma) for the Rincón del Tigre–Huanchaca large igneous province (LIP) of the Amazonian Craton: Implications for the Rodinia supercontinent W. Teixeira, M. А. Hamilton, G. А. Lima [et.al.]

Contributor(s): Teixeira, Wilson | Lima, Gabrielle А | Ruiz, Amarildo S | Matos, Ramiro | Ernst, Richard E | Hamilton, Mike А | Томский государственный университет Геолого-географический факультет Кафедра петрографииMaterial type: ArticleArticleSubject(s): Родиния, суперконтинент | Амазонский кратон | баделлеит | докембрийGenre/Form: статьи в журналах Online resources: Click here to access online In: Precambrian research Vol. 265. P. 273-285Abstract: High quality U–Pb (ID-TIMS) baddeleyite ages define the timing of crystallization of the Rincón del Tigrelayered intrusion (1110 ± 2 Ma) and the Huanchaca mafic suite (1112 ± 2 Ma) in the Bolivian Precambrian shield – SW portion of the Amazonian Craton. The identical ca. 1110–1112 Ma ages obtained foreach (about 500 km apart) suggest these belong to a previously unrecognized LIP. The large area of dis-tribution and the intraplate geochemistry for the 1110 Ma Huanchaca–Rincón del Tigre rocks support arelationship with mantle plume activity pre-dating Rodinia breakup. Contemporary anorogenic magmatism in Amazonia is probably linked to crustal melting caused by the LIP. The newly identified 1110 MaLIP has a tight age match with intraplate magmatism in the Congo, Kalahari and Indian cratons, and the Keweenawan event of central Laurentia among others. While a reconstruction history of Amazonia andLaurentia is still a matter of debate on paleomagnetic grounds, a reconstruction link with other crustalblocks remains possible.
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Библиогр.: с. 283-285

High quality U–Pb (ID-TIMS) baddeleyite ages define the timing of crystallization of the Rincón del Tigrelayered intrusion (1110 ± 2 Ma) and the Huanchaca mafic suite (1112 ± 2 Ma) in the Bolivian Precambrian shield – SW portion of the Amazonian Craton. The identical ca. 1110–1112 Ma ages obtained foreach (about 500 km apart) suggest these belong to a previously unrecognized LIP. The large area of dis-tribution and the intraplate geochemistry for the 1110 Ma Huanchaca–Rincón del Tigre rocks support arelationship with mantle plume activity pre-dating Rodinia breakup. Contemporary anorogenic magmatism in Amazonia is probably linked to crustal melting caused by the LIP. The newly identified 1110 MaLIP has a tight age match with intraplate magmatism in the Congo, Kalahari and Indian cratons, and the Keweenawan event of central Laurentia among others. While a reconstruction history of Amazonia andLaurentia is still a matter of debate on paleomagnetic grounds, a reconstruction link with other crustalblocks remains possible.

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