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- W2076136278 abstract "The continental margin of southeast Brazil is elevated. Onshore Tertiary basins and Late Cretaceous/Paleogene intrusions are good evidence for post breakup tectono-magmatic activity. To constrain the impact of post-rift reactivation on the geological history of the area, we carried out a new thermochronological study. Apatite fission track ages range from 60.7 1.9 Ma to 129.3 4.3 Ma, mean track lengths from 11.41 0.23 mm to 14.31 0.24 mm and a subset of the (U-Th)/He ages range from 45.1 1.5 to 122.4 2.5 Ma. Results of inverse thermal history modeling generally support the conclusions from an earlier study for a Late Cretaceous phase of cooling. Around the onshore Taubate Basin, for a limited number of samples, the first detectable period of cooling occurred during the Early Tertiary. The inferred thermal histories for many samples also imply subsequent reheating followed by Neogene cooling. Given the uncertainty of the inversion results, we did deterministic forward modeling to assess the range of possibilities of this Tertiary part of the thermal history. The evidence for reheating seems to be robust around the Taubate Basin, but elsewhere the data cannot discriminate between this and a less complex thermal history. However, forward modeling results and geological information support the conclusion that the whole area underwent cooling during the Neogene. The synchronicity of the cooling phases with Andean tectonics and those in NE Brazil leads us to assume a plate-wide compressional stress that reactivated inherited structures. The present-day topographic relief of the margin reflects a contribution from post-breakup reactivation and uplift." @default.
- W2076136278 created "2016-06-24" @default.
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- W2076136278 date "2012-11-01" @default.
- W2076136278 modified "2023-10-11" @default.
- W2076136278 title "Post-breakup tectonics in southeast Brazil from thermochronological data and combined inverse-forward thermal history modeling" @default.
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- W2076136278 doi "https://doi.org/10.1029/2012jb009340" @default.
- W2076136278 hasPublicationYear "2012" @default.
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