Mantle plumes and flood-basalt stratigraphy in the Paraná, South America

Abstract

Research Article| December 01, 1990 Mantle plumes and flood-basalt stratigraphy in the Paraná, South America David W. Peate; David W. Peate 1Department of Earth Sciences, Open University, Milton Keynes, MK7 6AA, England Search for other works by this author on: GSW Google Scholar Chris J. Hawkesworth; Chris J. Hawkesworth 1Department of Earth Sciences, Open University, Milton Keynes, MK7 6AA, England Search for other works by this author on: GSW Google Scholar Marta S.M. Mantovani; Marta S.M. Mantovani 2Departamento de Geofísico, Instituto Astronômico e Geofísico, Universidade de São Paulo, Caixa Postal 30627, 01051 São Paulo SP, Brazil Search for other works by this author on: GSW Google Scholar Wladimir Shukowsky Wladimir Shukowsky 2Departamento de Geofísico, Instituto Astronômico e Geofísico, Universidade de São Paulo, Caixa Postal 30627, 01051 São Paulo SP, Brazil Search for other works by this author on: GSW Google Scholar Geology (1990) 18 (12): 1223–1226. https://doi.org/10.1130/0091-7613(1990)018<1223:MPAFBS>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation David W. Peate, Chris J. Hawkesworth, Marta S.M. Mantovani, Wladimir Shukowsky; Mantle plumes and flood-basalt stratigraphy in the Paraná, South America. Geology 1990;; 18 (12): 1223–1226. doi: https://doi.org/10.1130/0091-7613(1990)018<1223:MPAFBS>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Geochemical studies of the Paraná continental flood basalts in Brazil have led to the recognition of distinct magma types, which have been used to infer the internal stratigraphy of the lava pile. The overstepping of stratigraphic units toward the north and a similar compositional change in sills within the underlying Paraná basin sedimentary rocks imply that the site of magnatism migrated ∼750 km toward the north during this volcanic event. This has important implications for recent plume-related models that have argued whether fithospheric rifting must accompany the presence of a mantle plume in order to generate continental flood-basalt magmatism. It is difficult to ascribe the magnitude and direction of the shift in the locus of the Paraná magmatism to movement of the Brazilian lithosphere relative to the underlying Tristan mantle plume. Instead, it is suggested that the observed lava distribution and internal structure of the Paraná-Etendeka flood-basalt province were imposed by the intracacies of the rifting process during the initial opening of the South Atlantic Ocean. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.