『Abstract
Analysis of 16 marine Permian-Triassic boundary sections with
a near-global distribution demonstrates systematic changes in
sediment fluxes and lithologies in the aftermath of the end-Permian
crisis. Sections from continental-margin and platform settings
exhibit higher bulk accumulation rates (BARs) and more clay-rich
compositions in the Griesbachian (earliest Triassic) relative
to the Changhsingian (latest Permian). These patterns, which largely
transcend regional variations in tectonic setting, sequence stratigraphic
factors, and facies, are hypothesized to have resulted from a
substantial (average 〜7×) increase in the flux of eroded material
from adjacent land areas owing to accelerated rates of chemical
and physical weathering as a function of higher surface temperatures,
increased acidity of precipitation, and changes in landscape stability
tied to destruction of terrestrial ecosystems. This sediment surge
may have been a contributory factor to the latest Permian marine
biotic crisis as well as to the delayed recovery of Early Triassic
marine ecosystems owing to the harmful effects of siltation and
eutrophication. Contemporaneous deep-sea sections show no increases
in sediment flux across the Permian-Triassic boundary owing to
their remoteness from continental siliciclastic sources and location
below the paleo-carbonate compensation depth.』
Introduction
Methods
Results
Discussion
Dating uncertainties
Sequence stratigraphic and tectonic controls on sedimentation
Biotic consequences of enhanced sediment fluxes
Conclusions
Acknowledgments
References cited