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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Late neoproterozoic P-T-t paths of syn- and post-collisional metamorphism in the Paranagua Terrane, Ribeira Belt (Brazil): implications for West Gondwana assembly

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Author(s):
Patias, D. [1, 2] ; Cury, L. F. [1] ; Faleiros, F. M. [3] ; Calderon, M. [4] ; Siga Jr, S. ; Theye, T. [5]
Total Authors: 6
Affiliation:
[1] Univ Fed Parana, Lamir Inst, Dept Geol, Curitiba, Parana - Brazil
[2] Univ Queensland, Sch Earth & Environm Sci, Brisbane, Qld - Australia
[3] Univ Sao Paulo, Inst Geociencias, Dept Mineral & Geotecton, Sao Paulo - Brazil
[4] Univ Andres Bello, Fac Ingn, Santiago - Chile
[5] Stuttgart Univ, Inst Inorgan Chem, Stuttgart - Germany
Total Affiliations: 5
Document type: Journal article
Source: INTERNATIONAL GEOLOGY REVIEW; v. 63, n. 18, p. 2314-2337, DEC 12 2021.
Web of Science Citations: 1
Abstract

Phase diagram modelling and U-Pb monazite ages reveal a clockwise Pressure-Temperature-time metamorphic evolution in the Paranagua Terrane (Ribeira Belt - SE Brazil) and characterized important tectonic events. Comparisons of our dataset with the Dom Feliciano and Kaoko belts indicate a contrasting metamorphic evolution of South American and African units during West Gondwana assembly. The Paranagua Terrane is considered an arc-related unit formed during the western Gondwana accretion, comprising Paleoproterozoic basement inliers, metasedimentary rocks and late Neoproterozoic granites. Metapelites mineral assemblages and chemistry combined with isotopic data indicate three tectonometamorphic stages for the terrane. M1 (640-610 Ma) is associated with collisional processes that resulted in a greenschist to lower amphibolite facies regional metamorphism (540-580 degrees C and similar to 6-8 kbar). The progression of the metamorphism followed a decompression path of c. 2-4 kbars and reached P-T conditions of similar to 725 degrees C at similar to 5 kbars (M2 - 610-580 Ma). M2 is associated with post-collisional processes related to slab-break off and partial exhumation of deeply buried sequences. Metapelites low-temperature retrograde conditions define a late M3 (540-500 Ma) metamorphic event. Our results demonstrate the similarities and differences of the Paranagua-Dom Feliciano-Kaoko orogenic system. The metamorphic evolution of the Paranagua Terrane and Northern Dom Feliciano Belt exhibits a geothermal gradient controlled by broad magmatic activity and post-collisional processes. In contrast, their suggested African counterpart (Kaoko Belt) shows a Barrovian metamorphic trend. This dataset permitted a refined time-space evolution of these southwest Gondwana units. (AU)

FAPESP's process: 18/10012-0 - Fluid flow, deformation and tectonic significance of regional shear zones from the southern Ribeira Belt
Grantee:Frederico Meira Faleiros
Support Opportunities: Regular Research Grants