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2017 ; 7
(ä): 43630
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Timing of global regression and microbial bloom linked with the Permian-Triassic
boundary mass extinction: implications for driving mechanisms
#MMPMID28262815
Baresel B
; Bucher H
; Bagherpour B
; Brosse M
; Guodun K
; Schaltegger U
Sci Rep
2017[Mar]; 7
(ä): 43630
PMID28262815
show ga
New high-resolution U-Pb dates indicate a duration of 89?±?38?kyr for the Permian
hiatus and of 14?±?57?kyr for the overlying Triassic microbial limestone in
shallow water settings of the Nanpanjiang Basin, South China. The age and
duration of the hiatus coincides with the Permian-Triassic boundary (PTB) and the
extinction interval in the Meishan Global Stratotype Section and Point, and
strongly supports a glacio-eustatic regression, which best explains the genesis
of the worldwide hiatus straddling the PTB in shallow water records. In adjacent
deep marine troughs, rates of sediment accumulation display a six-fold decrease
across the PTB compatible with a dryer and cooler climate as indicated by
terrestrial plants. Our model of the Permian-Triassic boundary mass extinction
(PTBME) hinges on the synchronicity of the hiatus with the onset of the Siberian
Traps volcanism. This early eruptive phase released sulfur-rich volatiles into
the stratosphere, thus simultaneously eliciting a short-lived ice age responsible
for the global regression and a brief but intense acidification. Abrupt cooling,
shrunk habitats on shelves and acidification may all have synergistically
triggered the PTBME. Subsequently, the build-up of volcanic CO(2) induced a
transient cool climate whose early phase saw the deposition of the microbial
limestone.