Environmental Engineering Reference
In-Depth Information
The coincidence, to within the limits of radiometric age determinations, of
several CFB provinces with times of major biotic change has been well docu-
mented; however, the mechanisms by which these episodes might perturb the
environment to this extent are not well understood.
Figure 11.4
summarizes
proposed causal mechanisms between CFB volcanism and environmental change
and gives our assessment of the level of current scienti
c understanding in each
area shown. It is very likely that the Earth system responded differently to volcanic
perturbations during different periods of geological history; therefore, we suggest
that future research efforts should be tailored to each CFB province on a case-by-
case basis. In particular, we suggest that knowledge of the number and length
of hiatuses during each individual case of CFB volcanism is as important as
knowledge of the eruptive phases, when attempting to quantify the severity and
duration of any potential environmental effects it caused.
Acknowledgements
SS was funded by UK-NERC grants NER/B/S/2003/00246 and GR3/11474,
and The Open University Research Development Fund. LSG is funded by the
NASA Planetary Geology and Geophysics Program (WBS 811073.02.01.05.80).
AS is funded by an Academic Research Fellowship from the School of Earth and
Environment, University of Leeds. TAM acknowledges the Leverhulme Trust and
NERC (NE/G01700X/1) for
financial support. Thanks to an anonymous reviewer
for their helpful comments.
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