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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.)

Detrital zircon U-Pb ages and whole-rock geochemistry of the Neoproterozoic Paulistana and Santa Filomena complexes, Borborema Province, northeastern Brazil: implications for source area composition, provenance, and tectonic setting

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Santos, Felipe H. [1] ; Amaral, Wagner S. [1] ; Uchoa Filho, Evilarde C. [2] ; Martins, Douglas T. [3]
Total Authors: 4
[1] Univ Estadual Campinas, Inst Geosci, Dept Geol & Nat Resources, POB 6152, BR-13083970 Campinas, SP - Brazil
[2] CPRM Geol Survey Brazil, Teresina - Brazil
[3] Inst Educ Ciencia & Tecnol Piaui IFPI, Paulistana - Brazil
Total Affiliations: 3
Document type: Journal article
Source: INTERNATIONAL GEOLOGY REVIEW; v. 59, n. 15, p. 1861-1884, 2017.
Web of Science Citations: 2

The Paulistana and Santa Filomena Complexes are situated in the southern part of the Borborema Province (northeastern Brazil), in the Riacho do Pontal Orogen, and represent meta-volcano-sedimentary sequences. We present compositional variations in the metasedimentary rocks and new U-Pb detrital zircon data. Major and trace elements indicate that the metasedimentary rocks from the Paulistana and Santa Filomena Complexes are composed mostly of immature to mature sediments derived from felsic-intermediate sources with moderate to slightly high chemical weathering. The geochemical signatures of the sediment protoliths for both complexes are characteristic of continental magmatic arc settings with minor contribution from recycled sediment sources. The source area for the Paulistana Complex rocks follow the compositional trend between calc-alkaline granites and granodiorites, whereas the Santa Filomena Complex rocks have a more restricted composition trending to more granodioritic sources. For the Paulistana Complex, two main source ages were identified: (1) Tonian (ca. 950Ma - sample RPE-58) and Tonian-Stenian (ca. 1.0Ga - sample RPE-103). These data coupled with geochemical information suggest that the Cariris Velhos arc system was the main source area for the Paulistana Complex. Regarding the Santa Filomena metasedimentary rocks, potential source-areas include: (1) Neoarchaean rocks (similar to 2.6Ga) represented by the adjacent basement rocks of the Riacho do Pontal Orogen; (2) Rhyacian-Orosirian rocks (2.2-2.0Ga) of the Riacho do Pontal Orogen and the Pernambuco-Alagoas terrain, which include an augen-gneiss with arc-related geochemical signature; (3) Statherian granites (1.7-1.6Ga); and (4) Cariris Velhos crust (1000-920Ma). The metasedimentary rocks of the Paulistana Complex were deposited in a rift stage (ca. 900Ma), which is related to the break-up of the Rodinia supercontinent. The metasedimentary rocks of the Santa Filomena Complex most probably were deposited in another rift stage (ca. 750-700Ma) and could be correlatives of the rift formation of the Caninde Domain (Sergipano Orogen). (AU)

FAPESP's process: 14/03275-3 - Geochronology, geochemistry and metamorphism of the internal domain in the Riacho do Pontal fold belt
Grantee:Wagner da Silva Amaral
Support type: Regular Research Grants