Although widely recognized, the nature and rate of
transitions between end-member “greenhouse” and “icehouse” climatic states
through geologic history remain enigmatic. In this paper, Holland and Patzkowsky explore the style of
cyclicity in the Late Ordovician Bighorn Dolomite, representing a time interval
with isotopic evidence for a prolonged ice buildup despite elevated pCO2
and global temperatures. They
document how this succession preserves systematic changes in the presence and
type of cyclicity and subaerial exposure.
The results of this study suggest that the cyclicity in the Bighorn
Dolomite closely reflects the rate and character of this short-lived, but
important, paleoclimatic transition, and illustrate how shallow-water carbonate
successions provide insight into other climate transitions.
Sequence architecture of the Bighorn Dolomite, Wyoming, U.S.A.: transition to the late Ordovician icehouse by Steven M. Holland and Mark E. Patzkowsky
No comments:
Post a Comment