EAST BORDER OF THE SANTA QUITÉRIA MAGMATIC ARC: A NEW ULTRA-HIGH PRESSURE BELT IN THE CEARÁ CENTRAL DOMAIN?

• Grant number: 16/08289-8
• Support Opportunities: Regular Research Grants
• Duration: September 01, 2016 - August 31, 2018
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Ticiano José Saraiva dos Santos
• Grantee: Ticiano José Saraiva dos Santos
• Host Institution: Instituto de Geociências (IG). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

Magmatic arcs are associated with oceanic lithosphere subduction, which in progressive oceanic closure may culminate with continental collision. In a few Phanerozoic orogeny worldwide, subduction to mantellic depth above 150 km is being verified, which is evidenced through ultra-high pressure (UHP) and high pressure (HP) terrains. Recently, in the North portion of Borborema Province, West margin of Santa Quitéria continental magmatic arc (SQCMA), a belt of ultra-high pressure (Forquilha eclogitc zone) has been identified with the presence of coesite relics included in garnets of metamafic rocks (garnet piroxenites). Otherside, in the East margin of this arc, Lagoa da Caiçara Unit has been individualized orthogneiss with crystallization ages between 640 e 830 Ma and interpreted as an intra-oceanic arc. Magneto-telluric (MT) data have indicated that the SQCMA was originated by double subduction with opposite vergences. The aim of this project is to detail the tectonic context of the East margin of SQCMA, with a view to understanding collisional and accrescionary processes initiated during the Neoproterozoic, mainly involving oceanic crust remains. To accomplish that efforts will be concentrated in: detailed field analysis, petrological and thermobarometric studies, Sm-Nd, Lu-Hf and U-Pb geochronological analysis and geochemistry of metabasic and metassediemntary rocks possibly submitted to high depths conditions. (AU)

Scientific publications

(5)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

GOMES, NADIA BORGES; DOS SANTOS, TICIANO JOSE SARAIVA; TEDESCHI, MAHYRA; GALANTE, DOUGLAS; LUVIZOTTO, GEORGE LUIZ. P-T-t reconstruction of a coesite-bearing retroeclogite reveals a new UHP occurrence in the Western Gondwana margin (NE-Brazil). LITHOS, v. 446, p. 23-pg., 2023-04-03. (16/08289-8, 17/09206-1)

MENDES, LUIZA DE CARVALHO; SARAIVA DOS SANTOS, TICIANO JOSE; GOMES, NADIA BORGES. Geochemistry and provenance of the metasedimentary rocks surrounding the Santa Quiteria magmatic arc, NE Brazil: Tectonic and paleogeographic implications for the assembly of West Gondwana. Precambrian Research, v. 356, MAY 2021. (16/08289-8, 17/09206-1)

KRAUS, RITA K.; MUNIZ, ROBERT DE LIMA; DOS SANTOS, TICIANO JOSE SARAIVA. Continental magmatic arc rotation during the assembly of western Gondwana. Journal of South American Earth Sciences, v. 120, p. 11-pg., 2022-10-04. (16/08289-8)

MUNIZ, ROBERT LIMA; SARAIVA DOS SANTOS, TICIANO JOSE; DANTAS, ELTON L.; FUCK, REINHARDT A.. Rhyacian-Orosirian Khondalite Belt in the Borborema Province (NE Brazil): An active margin setting based on U-Pb zircon and monazite constraints. GEOLOGICAL JOURNAL, v. N/A, p. 21-pg., 2022-06-04. (16/08289-8)

VITORIO, JEANDRO AUGUSTO; DOS SANTOS, TICIANO JOSE SARAIVA; DANTAS, ELTON L.; FUCK, REINHARDT A.. Geochemical data, Nd and Hf isotopes and U-Pb geochronology of meta-mafic rocks from western Gondwana suture zone. Journal of South American Earth Sciences, v. 127, p. 20-pg., 2023-05-12. (16/08289-8)