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Major shear zones of southern Brazil and Uruguay: escape tectonics in the eastern border of Rio de La plata and Paranapanema cratons during the Western Gondwana amalgamation

Passarelli, C.
Basei, M.
Wemmer, K.
Siga, O.
Oyhantçabal, P.
Journal: International Journal of Earth Sciences, 2010
100, 2/3: 391 - 414
DOI: https://doi.org/10.1007/s00531-010-0594-2
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/7051
Passarelli, C.; Basei, M.; Wemmer, K.; Siga, O.; Oyhantçabal, P., 2010: Major shear zones of southern Brazil and Uruguay: escape tectonics in the eastern border of Rio de La plata and Paranapanema cratons during the Western Gondwana amalgamation. In: International Journal of Earth Sciences, Band 100, 2/3: 391 - 414, DOI: 10.1007/s00531-010-0594-2.
 
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  • Abstract
The Mantiqueira Province represents a series of supracrustal segments of the South-American counterpart formed during the Gondwana Supercontinent agglutination. In this crustal domain, the process of escape tectonics played a conspicuous role, generating important NE–N–S-trending lineaments. The oblique component of the motions of the colliding tectonic blocks defined the transpressional character of the main suture zones: Lancinha-Itariri, Cubatão-Arcádia-Areal, Serrinha-Rio Palmital in the Ribeira Belt and Sierra Ballena-Major Gercino in the Dom Feliciano Belt. The process as a whole lasted for ca. 60 Ma, since the initial collision phase until the lateral escape phase predominantly marked by dextral and subordinate sinistral transpressional shear zones. In the Dom Feliciano Belt, southern Brazil and Uruguay, transpressional event at 630–600 Ma is recognized and in the Ribeira Belt, despite less coevally, the transpressional event occurred between 590 and 560 Ma in its northern-central portion and between ca. 625 and 595 Ma in its central-southern portion. The kinematics of several shear zones with simultaneous movement in opposite directions at their terminations is explained by the sinuosity of these lineaments in relation to a predominantly continuous westward compression.
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