DOI: 10.1007/s00531-014-1035-4
Scopus记录号: 2-s2.0-84939885782
论文题名: SHRIMP U–Pb zircon geochronology and Nd signatures of supracrustal sequences and orthogneisses constrain the Neoproterozoic evolution of the Pernambuco–Alagoas domain, southern part of Borborema Province, NE Brazil
作者: Da Silva Filho A.F. ; Guimarães I.P. ; Van Schmus W.R. ; Armstrong R.A. ; Rangel da Silva J.M. ; Osako L.S. ; Cocentino L.M.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期: 8 起始页码: 2155
结束页码: 2190
语种: 英语
英文关键词: Borborema Province
; Ensialic
; Neoproterozoic
; Sm–Nd model ages
; U–Pb ages
英文摘要: The Borborema Province is the western part of a major Brasiliano belt that extends from Brazil through NW Africa in pre-drift reconstructions. This province resulted from convergence and collision among the West African, Congo-São Francisco, and Amazonian cratons about 600 Ma. This study focuses on the Pernambuco–Alagoas (PEAL) domain, which is a complex of magmatic, migmatitic, and metamorphic rocks, located in the southern part of the Borborema Province. U–Pb geochronology and Sm–Nd data for metasedimentary sequences (Rio Una, Inhapi) of the PEAL domain and a sample from a sequence of the Transversal Zone domain suggest that their deposition occurred during a Cryogenian extensional event, within the interval 850–631 Ma (or slightly younger). This extensional event occurred in the PEAL, Transversal Zone, and Sergipano domains before the onset of the Brasiliano collision and was followed by syn- and post-collisional magmatism. The Rio Una sequence and the sequence from Transversal Zone domain were deposited over a Rhyacian (ca. 2.0–2.2) basement having a juvenile Palaeoproterozoic Nd signature, whereas the Inhapi sequence was deposited over an Early Neoproterozoic (Tonian) basement. The deposition of the studied sequences is coeval with metasedimentary sequences to the north and south in other domains of the Borborema Province. However, differences in Nd isotopic signatures between the sequences from PEAL, Transversal Zone, and Sergipano domains suggest that they were formed in distinct basins. Metasedimentary sequences from the PEAL domain have Meso- and Palaeoproterozoic TDM model ages. These data suggest that the orogens where the metasedimentary sequences are located have a strong ensialic component. TDM model ages of ca. 1.0 Ga and εNd (0.6 Ga) values around zero recorded in granites from the southern part of the PEAL, suggesting that juvenile material was accreted to the southern part of the PEAL domain crust during the Tonian. The migmatites from the PEAL domain have a wide range of TDM ages along with a wide range of εNd (0.6 Ga) values. The transition between the northern and southern parts of the PEAL domain denotes the approximate northern margin of a Late Mesoproterozoic to Early Neoproterozoic rift. © 2014, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84939885782&doi=10.1007%2fs00531-014-1035-4&partnerID=40&md5=5cc7d3194ececea8d45e39e18e46cf8b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70420
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Geology, Technologic and Geosciences Center, Universidade Federal de Pernambuco, Avenida Acadêmico Helio Ramos S/N, Recife, PE, Brazil; Department of Geology, Room 120, 1475 Jayhawk Blvd, University of Kansas, Lawrence, KS, United States; PRISE, Research School of Earth Sciences, Australian National University, Building 61, Mills Road, Canberra, Australia
Recommended Citation:
Da Silva Filho A.F.,Guimarães I.P.,Van Schmus W.R.,et al. SHRIMP U–Pb zircon geochronology and Nd signatures of supracrustal sequences and orthogneisses constrain the Neoproterozoic evolution of the Pernambuco–Alagoas domain, southern part of Borborema Province, NE Brazil[J]. International Journal of Earth Sciences,2014-01-01,103(8)