Geochemistry of the Northern Parana Continental Flood Basalt (PCFB) Province: implications for regional chemostratigraphy

Made available in DSpace on 2018-11-26T16:04:30Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-04-01. Added 1 bitstream(s) on 2021-07-15T15:20:22Z : No. of bitstreams: 1 S2317-48892018000200177.pdf: 10956683 bytes, checksum: 288814a4f6468b50e5c268cb527734e2 (MD5) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) The Parana Continental Flood Basalt (PCFB) province is one of the largest igneous provinces on Earth, but little is known about the architecture and geochemical characteristics of the lava flows. In this context, a set of borehole samples arranged in an NEE-SWW profile - more than 600 km long - located in the northern PCFB was used to define its chemostratigraphy. In this region, the outcrops are rare, and the volcanic piles are covered by hundreds of meters of sedimentary rocks from the Bauru Sub-Basin. This study aimed to explore the chemostratigraphic column from northern PCFB to improve the understanding of its internal architecture and to characterize the flood basalt sequences by using the petrography and elemental geochemistry of surface and borehole samples. The results showed the presence of the main four magma types, which were essentially distinguished by their P2O5, TiO2 and Sr concentrations, as well as Zr/Y ratios, with excellent chemostratigraphy relations. Univ Fed Sao Paulo, Inst Ciencias Ambientais, Dept Ciencias Ambientais, Sao Paulo, SP, Brazil Univ Fed Bahia, Dept Fis Terra & Meio Ambiente, Inst Fis, Salvador, BA, Brazil Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Sao Paulo, SP, Brazil Univ Estadual Paulista Julia Mesquita Filho, Inst Geociencias & Ciencias Exatas, Rio Claro, SP, Brazil Univ Sao Paulo, Inst Geociencias, Sao Paulo, SP, Brazil Univ Estadual Paulista Julia Mesquita Filho, Inst Geociencias & Ciencias Exatas, Rio Claro, SP, Brazil CNPq: 482911/2011-5 FAPESP: 2012/06082-6