TY - JOUR
T1 - Geochemical and isotopic evidence for early neoproterozoic (ca. 1000 Ma) subduction-related magmatism in the central Borborema Province, Brazil
AU - Paixão, Mariana S.
AU - Santos, Lauro Cézar M.Lira
AU - Dantas, Elton L.
AU - Cawood, Peter A.
N1 - Funding Information:
This paper is the outcome of the master's dissertation of the first author at the Universidade Federal de Pernambuco. The Coordenação de Aperfeiçoamento de Pessoal de Nível Superior is acknowledged for providing the scholarship. We express our gratitude for the support received from Fundação de Amparo à Pesquisa do Estado de Pernambuco grant APQ-1018-1.07/21, Conselho Nacional de Ciência e Tecnologia grant 309493/2020-0, Australian Research Council grant FL160100168, and Instituto Nacional de Ciência e Tecnologia de Estudos Tectônicos.
Publisher Copyright:
© 2024 Elsevier Ltd
PY - 2024/5
Y1 - 2024/5
N2 - Early Neoproterozoic (1000-920 Ma) rocks related to the Cariris Velhos event in the central Borborema Province have been linked to either continental rifting or accretionary-collisional orogenesis. The Serra do Jatobá Suite is located in the southwestern part of the Alto Pajeú Terrane along with coeval metasedimentary sequences and Ediacaran granites. This suite is composed of alkali-calcic, meta-to peraluminous granodiorites to monzogranites that share similarities with both ferroan- and magnesian granite series. Chondrite normalized REE (Rare Earth Elements) patterns are moderately fractionated with pronounced negative Eu anomalies. Incompatible element spidergrams show a negative Nb–Ta anomaly, similar to those observed in Cordilleran-type granites. U–Pb zircon data constrain the crystallization ages at around 1000 Ma, whereas calculated εNd(t) values range between −1.74 and −0.94. Obtained TDM model ages range from 1.76 to 1.54 Ga, which corresponds with source ages for the Cariris Velhos magmatic rocks. Our findings suggest that subduction took place in the early Neoproterozoic in the Borborema Province, pointing to an accretionary nature for the Cariris Velhos event.
AB - Early Neoproterozoic (1000-920 Ma) rocks related to the Cariris Velhos event in the central Borborema Province have been linked to either continental rifting or accretionary-collisional orogenesis. The Serra do Jatobá Suite is located in the southwestern part of the Alto Pajeú Terrane along with coeval metasedimentary sequences and Ediacaran granites. This suite is composed of alkali-calcic, meta-to peraluminous granodiorites to monzogranites that share similarities with both ferroan- and magnesian granite series. Chondrite normalized REE (Rare Earth Elements) patterns are moderately fractionated with pronounced negative Eu anomalies. Incompatible element spidergrams show a negative Nb–Ta anomaly, similar to those observed in Cordilleran-type granites. U–Pb zircon data constrain the crystallization ages at around 1000 Ma, whereas calculated εNd(t) values range between −1.74 and −0.94. Obtained TDM model ages range from 1.76 to 1.54 Ga, which corresponds with source ages for the Cariris Velhos magmatic rocks. Our findings suggest that subduction took place in the early Neoproterozoic in the Borborema Province, pointing to an accretionary nature for the Cariris Velhos event.
KW - Accretionary orogeny
KW - Borborema province
KW - Cariris Velhos event
KW - Western Gondwana
UR - http://www.scopus.com/inward/record.url?scp=85187020633&partnerID=8YFLogxK
U2 - 10.1016/j.jsames.2024.104846
DO - 10.1016/j.jsames.2024.104846
M3 - Article
AN - SCOPUS:85187020633
SN - 0895-9811
VL - 137
JO - Journal of South American Earth Sciences
JF - Journal of South American Earth Sciences
M1 - 104846
ER -