Neoproterozoic crustal accretion in central Brazil 论文

摘要

Research Article| April 01, 1992 Neoproterozoic crustal accretion in central Brazil Márcio Martins Pimentel; Márcio Martins Pimentel 1Instituto de Geosciências, Universidade de Brasília, Brasília, DF 70910, Brasil Search for other works by this author on: GSW Google Scholar Reinhardt Adolfo Fuck Reinhardt Adolfo Fuck 1Instituto de Geosciências, Universidade de Brasília, Brasília, DF 70910, Brasil Search for other works by this author on: GSW Google Scholar Author and Article Information Márcio Martins Pimentel 1Instituto de Geosciências, Universidade de Brasília, Brasília, DF 70910, Brasil Reinhardt Adolfo Fuck 1Instituto de Geosciências, Universidade de Brasília, Brasília, DF 70910, Brasil Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1992) 20 (4): 375–379. https://doi.org/10.1130/0091-7613(1992)020<0375:NCAICB>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 Email Permissions Search Site Citation Márcio Martins Pimentel, Reinhardt Adolfo Fuck; Neoproterozoic crustal accretion in central Brazil. Geology 1992;; 20 (4): 375–379. doi: https://doi.org/10.1130/0091-7613(1992)020<0375:NCAICB>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 Recent geochronological studies have demonstrated the existence of several Neoproterozoic orthogneiss and metavolcanic are suites (ca. 900 to 600 Ma) in the southern part of the Tocantins province, a major Neoproterozoic orogenic area in central Brazil, exposed between the Amazon and São Francisco cratons. Nd and Sr isotopic characteristics of these metamorphic suites are primitive: initial 87Sr/87Sr ratios vary from ∼0.7024 to ∼0.7042 and initial ϵNd values are positive, varying between +0.2 and +6.9. The most primitive initial Sr and Nd isotopic compositions are very similar to model depleted- mantle compositions at the time of formation of the original magmas. The mantle- like characteristics of these are suites in western Goiás contradict previous ensialic evolution models for the Tocantins province and reveal that crustal accretion processes were important in large areas of central Brazil during Neoproterozoic time. 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.