Small-scale mantle convection produces stratigraphic sequences in sedimentary basins.
Cyclic sedimentary deposits link stratigraphic sequences that are now geographically distant but were once part of the same depositional environment. Some of these sequences occur at periods of 2 to 20 million years, and eustatic sea-level variations or regional tectonic events are likely causes of their formation. Using numerical modeling, we demonstrate that small-scale mantle convection can also cause the development of stratigraphic sequences through recurrent local and regional vertical surface movements. Small-scale convection-driven stratigraphic sequences occur at periods of 2 to 20 million years and correlate only at distances up to a few hundred kilometers. These results suggest that previous sequence stratigraphic analyses may contain erroneous conclusions regarding eustatic sea-level variations.
Petersen
K D
KD
Department of Earth Science, Aarhus University, DK-8000 Aarhus C, Denmark. kenni@geo.au.dk
Nielsen
S B
SB
Clausen
O R
OR
Stephenson
R
R
Gerya
T
T