期刊
ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS
卷 84, 期 2, 页码 347-376出版社
ACAD BRASILEIRA DE CIENCIAS
DOI: 10.1590/S0001-37652012005000034
关键词
Camaqua Basin; Earth Sciences; Neoproterozoic; Paleostress Analysis; Rift Basin; Southern Brazil
资金
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2000/11089-2, 2005/53522-8, 2006/506550, 09/53362-1, 2010/50902-2, 2010/51103-6]
In Eastern South America, a series of fault-bounded sedimentary basins that crop out from Southern Uruguay to Southeastern Brazil were formed after the main collisional deformation of the Brasiliano Orogeny and record the tectonic events that affected the region from the Middle Ediacaran onwards. We address the problem of discerning the basin-forming tectonics from the later deformational events through paleostress analysis of more than 600 fault-slip data, mainly from the Camaquil Basin (Southern Brazil), sorted by stratigraphic level and cross-cutting relationships of superposed striations, and integrated with available stratigraphic and geochronological data. Our results show that the Camaqua Basin was formed by at least two distinct extensional events, and that rapid palcostress changes took place in the region a few tens of million years after the major collision (c.a. 630 Ma), probably due to the interplay between local active extensional tectonics and the distal effects of the continued amalgamation of plates and terranes at the margins of the still-forming Gondwana Plate. Preliminary paleostress data from the Castro Basin and published data from the Itajai Basin suggest that these events had a regional nature.
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