Post-rift regional volcanism in southern Santos Basin and the uplift of the adjacent South American coastal range

Uri Schattner, Michel Michaelovitch de Mahiques

Research output: Contribution to journalArticlepeer-review

Abstract

The Serra do Mar coastal mountain range plays a crucial role in the sedimentary budget of both the South American continent and its adjacent Atlantic margin. This 1500-km range began to rise during the Late Cretaceous. The uplift prevented the direct input of sediments from the continent to Santos Basin, thus diverting the Paraná River drainage inland and southwards. However, the cause for the uplift is still debated: distinct phases of the Andean orogeny, thermal activity of the Trindade hotspot, and a general thermal weakening caused by earlier mantle plume activity. The current study attempts to explain the uplift initiation by introducing a previously unknown 150-km wide magmatic cluster discovered in multichannel seismic reflection data across the southern Santos Basin. The newly discovered “Santos cluster” includes plutons, sills, and volcanic edifices within the Turonian-Campanian stratigraphic interval, indicating an Early Campanian magmatic phase. We suggest that the widespread magmatism uplifted the southern Santos Basin, and included lateral NNE salt migration. The marine magmatism occurred along with previously reported Campanian volcanic activity in three localities along the Serra do Mar, which uplifted the coastal range and diverted the drainage inland (westward). We suggest that both marine and continental magmatism relate to the SW sub-crustal flow of the Trindade hotspot head.

Original languageEnglish
Article number102855
JournalJournal of South American Earth Sciences
Volume104
DOIs
StatePublished - Dec 2020

Bibliographical note

Funding Information:
The authors acknowledge the Brazilian National Agency for Oil, Gas, and Biofuels, for providing the seismic lines used in this work. We thank Petrel-Schlumberger for providing academic licenses that enabled the seismic interpretation. We thank the editor and reviewers for the excellent comments that improved the manuscript. This work has been partially funded by The S?o Paulo Science Foundation (FAPESP), Grants 2015/17763-2 and 2019/06250-5/Sprint Program.

Funding Information:
The authors acknowledge the Brazilian National Agency for Oil, Gas, and Biofuels, for providing the seismic lines used in this work. We thank Petrel-Schlumberger for providing academic licenses that enabled the seismic interpretation. We thank the editor and reviewers for the excellent comments that improved the manuscript. This work has been partially funded by The São Paulo Science Foundation ( FAPESP ), Grants 2015/17763-2 and 2019/06250-5/Sprint Program .

Publisher Copyright:
© 2020 Elsevier Ltd

ASJC Scopus subject areas

  • Geology
  • Earth-Surface Processes

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