Show simple item record

dc.contributor.authorRizzotto, G.
dc.contributor.authorHartmann, L.
dc.contributor.authorSantos, J.
dc.contributor.authorMcNaughton, Neal
dc.date.accessioned2017-01-30T15:10:43Z
dc.date.available2017-01-30T15:10:43Z
dc.date.created2014-04-30T20:00:51Z
dc.date.issued2014
dc.identifier.citationRizzotto, Gilmar J. and Hartmann, Leo A. and Santos, Joao O.S. and McNaughton, Neal J. 2014. Tectonic evolution of the southern margin of the Amazonian craton in the late Mesoproterozoic based on field relationships and zircon U-Pb geochronology. Anais da Academia Brasileira de Ciencias. 86 (1): pp. 57-84.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/43881
dc.identifier.doi10.1590/0001-37652014104212
dc.description.abstract

New U-Pb zircon geochronological data integrated with field relationships and an airborne geophysical survey suggest that the Nova Brasilândia and Aguapeí belts are part of the same monocyclic, metaigneous and metasedimentary belt formed in the late Mesoproterozoic (1150 Ma-1110 Ma). This geological history is very similar to the within-plate origin of the Sunsás belt, in eastern Bolivia. Thus, we propose that the Nova Brasilândia, Aguapeí and Sunsás belts represent a unique geotectonic unit (here termed the Western Amazon belt) that became amalgamated at the end of the Mesoproterozoic and originated through the reactivation of a paleo-suture (Guaporé suture zone) in an intracontinental rift environment. Therefore, its geological history involves a short, complete Wilson cycle of ca. 40 Ma. Globally, this tectonic evolution may be related with the final breakup of the supercontinent Columbia. Mafic rocks and trondhjemites in the northernmost portion of the belt yielded U-Pb zircon ages ca. 1110 Ma, which dates the high-grade metamorphism and the closure of the rift. This indicates that the breakup of supercontinent Columbia was followed in short sequence by the assembly of supercontinent Rodinia at ca. 1.1-1.0 Ga and that the Western Amazon belt was formed during the accretion of the Arequipa-Antofalla basement to the Amazonian craton.

dc.publisherAcademia Brasileira de Ciencias
dc.subjectU-Pb geochronology
dc.subjectWestern Amazon belt
dc.subjectMesoproterozoic
dc.subjectintracontinental rift
dc.subjectAmazonian craton
dc.titleTectonic evolution of the southern margin of the Amazonian craton in the late Mesoproterozoic based on field relationships and zircon U-Pb geochronology
dc.typeJournal Article
dcterms.source.volume86
dcterms.source.number1
dcterms.source.startPage57
dcterms.source.endPage84
dcterms.source.issn0001-3765
dcterms.source.titleAnais da Academia Brasileira de Ciencias
curtin.note

This article is published under the Open Access publishing model and distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by-nc/3.0/. Please refer to the licence to obtain terms for any further reuse or distribution of this work.

curtin.department
curtin.accessStatusOpen access


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record