10.6084/m9.figshare.3453245.v1
Julio Almeida
Julio
Almeida
Fatima Dios
Fatima
Dios
Webster Ueipass Mohriak
Webster Ueipass
Mohriak
Claudio De Morisson Valeriano
Claudio
De Morisson Valeriano
Monica Heilbron
Monica
Heilbron
Luiz Guilherme Eirado
Luiz Guilherme
Eirado
Edison Tomazzoli
Edison
Tomazzoli
Pre-rift tectonic scenario of the Eo-Cretaceous Gondwana break-up along SE Brazil–SW Africa: insights from tholeiitic mafic
dyke swarms
Geological Society of London
2016
Gondwana
SW South Atlantic margin
mafic dyke swarms
basaltic lava flows
SE
tholeiitic mafic dyke swarms
Geology
2016-06-21 11:15:12
Dataset
https://geolsoc.figshare.com/articles/dataset/Pre-rift_tectonic_scenario_of_the_Eo-Cretaceous_Gondwana_break-up_along_SE_Brazil_SW_Africa_insights_from_tholeiitic_mafic___dyke_swarms/3453245
<p>This chapter presents a synthesis of the pre-break-up plate tectonics of western Gondwana and the pre- and syn-rift magmatism
in the SW South Atlantic margin (Brazil, Uruguay and Argentina) and the conjugate African continental margin (Angola, Namibia
and South Africa). An updated database of the geographical locations of the primary available radiometric ages is also included
in this work. A systematic analysis of the K–Ar and Ar/Ar ages from outcrops and boreholes shows a marked Mid to Late Jurassic
peak in the southernmost segment of the South Atlantic, related to the emplacement of the Karoo volcanics in South Africa
and in Argentina (including the Falkland Islands), and an important Early Cretaceous peak with age distributions that are
related to the Gondwana break-up and formation of rift basins along the incipient continental margins. In both the southern
Brazilian and Argentinian margins, as well as in the conjugate Namibian and South African margins, several igneous centres
and basaltic lava flows are suggestive of the influence of mantle plumes in the Early Cretaceous, which were heralded by mafic
dyke swarms in Argentina, Brazil, South Africa and Namibia.
</p>