| Texto completo | |
| Autor(es): |
Gusao, Joao Pedro
;
Janasi, Valdecir de Assis
;
Negri, Francisco de Assis
;
Fernandes, Amelia Joao
;
Guerra, Julia Taciro Mandacaru
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | BRAZILIAN JOURNAL OF GEOLOGY; v. 54, n. 2, p. 15-pg., 2024-01-01. |
| Resumo | |
We combined detailed field work with whole-rock geochemistry of samples from both surface exposures and rock chips from a similar to 300 m pile of basalt retrieved from a groundwater borehole in the Ja & uacute; region (central part of the state of Sao Paulo) to contribute to the stratigraphic knowledge of the northern Paran & aacute; Magmatic Province. The P2O5 content was used as the first guide to flow identification, always combined with other minor and trace elements (mostly Ti, Zr, Sr, and Cu). This approach allowed the establishment of a stratigraphic column with 16 flows, which were tentatively divided into three sequences. Regional correlations show that the lower portion of these basalt flows (Sequence 1) has good correspondence with the flow-by-flow succession identified at the border of the Parana Basin by previous regional works. The upper eight flows, occurring at the top of the plateau where the thickness of basalt reaches up to 300 m, should have their continuity westward (toward the center of the Parana Basin), where the volcanic pile thickens. The local preservation of these upper flows may result from significant (up to 170 m) displacements along the ENE-directed Jau fault, identified from stratigraphic relations here defined in the basalt pile. (AU) | |
| Processo FAPESP: | 12/06082-6 - A província magmática Paraná-Etendeka no Brasil: relações temporais e petrológicas entre o magmatismo toleítico e alcalino e suas implicações geodinâmicas |
| Beneficiário: | Excelso Ruberti |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 19/22084-8 - A Província Magmática Paraná: petrogênese, cronologia e impacto ambiental do magmatismo toleítico, alcalino e silícico Cretáceo na Plataforma Brasileira |
| Beneficiário: | Valdecir de Assis Janasi |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |