Phanerozoic sedimentary sequences of the South American platform

Details Phanerozoic sedimentary sequences of the South American platform Phanerozoic sedimentary sequences of the South American platform

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981esrv...17...49m&link_type=abstract

Earth Science Reviews, Volume 17, Issue 1-2, p. 49-67.

Physics

1

Scientific paper

The Phanerozoic history of the South American Platform can be divided in three stages, called Transition, Stabilization and Reactivation. Each stage is characterized by the accumulation of a number of sedimentary sequences. During the Transition Stage, which lasted from the Cambrian to Silurian, the sediments have a molassic character, being chiefly foreland deposits of the mountains formed by the Late Precambrian orogeny. The Stabilization Stage is marked by the development of large syneclises in which rather thick sedimentary sequences accumulated, first in a marine environment (Devonian-Early Carboniferous), later in a continental one (Late Carboniferous-Jurassic). In southern Brazil part of these sequences was deposited under glacial conditions (Late Paleozoic Gondwana glaciation). During the tectonic Reactivation stage caused by the break-up of the Gondwana continent, the intracratonic basins received a new lithic fill derived from recently formed reliefs. Along ancient and new tectonic lines, chiefly faults, new sedimentary basins could develop in which continental deposits accumulated. A whole series of basins formed also along the newly opened South Atlantic Ocean. In these areas of sedimentation, three phases of development can be distinguished. These resulted in a lower clastic sequence, a middle evaporitic to shelf limestone sequence, and an upper purely marine sequence. Along the Andean margin, only one basin is present on Brazilian territory, showing its own specific development.

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