TY - JOUR
T1 - Calymmian (1.50-1.45 Ga) magmatic records in Votuverava and Perau sequences, south-southeastern Brazil
T2 - Zircon ages and Nd-Sr isotopic geochemistry
AU - Siga, Oswaldo
AU - Stipp Basei, Miguel Angelo
AU - Sato, Kei
AU - Passarelli, Cláudia Regina
AU - Nutman, Allen
AU - McReath, Ian
AU - José dos Prazeres Filho, Hélcio
PY - 2011/12
Y1 - 2011/12
N2 - The main aim of this work is to present and discuss the U-Pb zircon ages and Nd-Sr isotopic data from the metabasic rocks that occur within the metamorphosed Votuverava and Perau volcano sedimentary sequences, located in the Apiaí Terrane, south-southeastern Brazil. The geochemical pattern of most of these metabasic rocks is similar to those of tholeiitic basalts, suggesting an extensional environment. The U-Pb zircon ages obtained around ca. 1480 Ma characterize an important basic magmatism during the Mesoproterozoic in south-southeastern Brazil. Nd model ages and e{open} Nd/e{open} Sr signatures suggest the Mesoproterozoic as the main period of mantle/crust differentiation for the crustal precursors of these metabasic rocks. It is quite possible that the Mesoproterozoic extentional events that caused the opening of large sedimentary basins in southern-southeastern Brazil have been underestimated. Possible regional correlations between the Votuverava-Perau basin (PR), the Betara and água Clara sequences (PR-SP) and the Serra do Itaberaba Group (SP) demonstrate the magnitude of the extensional process associated with the break-up of the preexisting continental masses.
AB - The main aim of this work is to present and discuss the U-Pb zircon ages and Nd-Sr isotopic data from the metabasic rocks that occur within the metamorphosed Votuverava and Perau volcano sedimentary sequences, located in the Apiaí Terrane, south-southeastern Brazil. The geochemical pattern of most of these metabasic rocks is similar to those of tholeiitic basalts, suggesting an extensional environment. The U-Pb zircon ages obtained around ca. 1480 Ma characterize an important basic magmatism during the Mesoproterozoic in south-southeastern Brazil. Nd model ages and e{open} Nd/e{open} Sr signatures suggest the Mesoproterozoic as the main period of mantle/crust differentiation for the crustal precursors of these metabasic rocks. It is quite possible that the Mesoproterozoic extentional events that caused the opening of large sedimentary basins in southern-southeastern Brazil have been underestimated. Possible regional correlations between the Votuverava-Perau basin (PR), the Betara and água Clara sequences (PR-SP) and the Serra do Itaberaba Group (SP) demonstrate the magnitude of the extensional process associated with the break-up of the preexisting continental masses.
KW - Apiaí terrane
KW - Mesoproterozoic
KW - Metabasic rocks
KW - U-Pb zircon
KW - Votuverava and Perau sequences
UR - http://www.scopus.com/inward/record.url?scp=80052725787&partnerID=8YFLogxK
U2 - 10.1016/j.jsames.2011.03.015
DO - 10.1016/j.jsames.2011.03.015
M3 - Article
SN - 0895-9811
VL - 32
SP - 301
EP - 308
JO - Journal of South American Earth Sciences
JF - Journal of South American Earth Sciences
IS - 4
ER -