Although
recent discoveries and exploitation in the South Atlantic have re-emphasized
their importance, for many years, lacustrine carbonates have been de-emphasized
relative to their more abundant open marine counterparts. Seventy-five years ago, Twenhofel described bottom sediment in Lake Monona in Wisconsin. The study of cores from this lake revealed
black organic-rich sludge underlain by lighter-colored firm marls. Perhaps heralding recent emphasis into
the importance of microbial processes in lacustrine carbonates, the results
were interpreted to reflect the importance of bacteria in degradation of
organic matter, precipitation of calcium carbonate, and, ultimately, the manner
and style of accumulation of these lake deposits.
The Bottom Sediments of Lake Monona, a Fresh-Water Lake of Southern Wisconsin by
William. H. Twenhofel
No comments:
Post a Comment