Evidence of Gondwana early rifting process recorded by Resende-Ilha Grande Dike Swarm, southern Rio de Janeiro, Brazil
详细信息 查看全文
- 作者：Eliane Guedesa ; b ; eguedes@mn.ufrj.br" class="auth_mail" title="E-mail the corresponding author ; Monica Heilbronb ; monica.heilbron@gmail.com" class="auth_mail" title="E-mail the corresponding author ; Claudio de Morisson Valerianob ; c ; valeriano.claudio@gmail.com" class="auth_mail" title="E-mail the corresponding author ; Julio Cé ; sar Horta de Almeidab ; jchalmeida@gmail.com" class="auth_mail" title="E-mail the corresponding author ; Peter Szatmarid ; szatmari@petrobras.com.br" class="auth_mail" title="E-mail the corresponding author
- 关键词：South Gondwana breakup ; Dike swarm ; 40Ar/39Ar ages ; Tholeiitic magmatism ; 87Sr/86Sr isotopes
- 刊名：Journal of South American Earth Sciences
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：67
- 期：Complete
- 页码：11-24
- 全文大小：3609 K
文摘
- •
40Ar/39Ar data for Resende-Ilha Grande Tholeiitic Dike Swarm point to early extensional episode ca. 156-144 Ma.
- •
The event precedes the onset of Paraná LIP and the Gondwana break-up.
- •
Three high-TiO2 magmatic suites identified using geochemistry and Nd and Sr isotopic data.
- •
TDM ages suggest basement contamination and are similar to mafic rocks interlayered with Neoproterozoic basement.
- •
The swarm represents the precise onshore projection of Pelotas-Santos rift propagator, in the N–S direction.