Ages (U-Pb SHRIMP and LA ICPMS) and stratigraphic evolution of the Neoproterozoic volcano-sedimentary successions from the extensional Camaqua Basin, Southern Brazil
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
07/11/2013
07/11/2013
2012
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Resumo |
During the Ediacaran, southern Brazil was the site of multiple episodes of volcanism and sedimentation, which are best preserved in the 3000 km(2) Camaqua Basin. The interlayered sedimentary and volcanic rocks record tectonic events and paleoenvironmental changes in a more than 10 km-thick succession. In this contribution, we report new U-Pb and Sm-Nd geochronological constraints for the 605 to 580 Ma Born Jardim Group, the 570 Ma Acampamento Velho Formation, and a newly-recognized 544 Ma volcanism. Depositional patterns of these units reveal the transition from a restricted, fault-bounded basin into a wide, shallow basin. The expansion of the basin and diminished subsidence rates are demonstrated by increasing areal distribution and compressed isopachs and increasing onlap of sediments onto the basement to the west. The Sm-Nd isotopic composition of the volcanic rocks indicates mixed sources, including crustal rocks from the adjacent basement. Both Neoproterozoic and Paleoproterozoic sources are indicated for the western part of the basin, whereas only the older Paleoproterozoic signature can be discerned in the eastern part of the basin. (C) 2011 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) FAPESP - Fundacao de Amparo a Pesquisa do Estado de Sao Paulo [03/12802-2, 05/53522-8, 05/57939-0, 09/53362-1] |
Identificador |
GONDWANA RESEARCH, AMSTERDAM, v. 21, n. 41335, Special Issue, supl. 1, Part 4, pp. 466-482, MAR, 2012 1342-937X http://www.producao.usp.br/handle/BDPI/42843 10.1016/j.gr.2011.04.010 |
Idioma(s) |
eng |
Publicador |
ELSEVIER SCIENCE BV AMSTERDAM |
Relação |
GONDWANA RESEARCH |
Direitos |
restrictedAccess Copyright ELSEVIER SCIENCE BV |
Palavras-Chave | #EDIACARAN #CAMAQUA BASIN #BORN JARDIM GROUP #ACAMPAMENTO VELHO FORMATION #DEPOSITIONAL SYSTEM #STRATIGRAPHIC EVOLUTION #DOM-FELICIANO BELT #PAN-AFRICAN #ALKALINE VOLCANISM #MAGMATIC PROCESSES #URUGUAY #DEFORMATION #EDIACARAN #GONDWANA #ZIRCON #ROCKS #GEOSCIENCES, MULTIDISCIPLINARY |
Tipo |
article original article publishedVersion |