CONCLUSIONS
The results of our study
are summarized as follows:
- Nine calcareous nannofossil events defined by Takayama and Sato
(1987) were found within sediments of the top six cores at Site 1007. The
sedimentation rate dramatically drops at depths above 12 mbsf, and a hiatus
characterized by sharp erosional contact exists at 2 mbsf.
- The sediments of the top six cores at Site 1007 can be divided
into four types based on the IRM acquisition and on the AF demagnetization
of ARM and IRM. Two significant magnetic conversion points are found at ~2
and ~12 mbsf (during the Pleistocene).
- These conversion points seem to reflect changes in oceanic
conditions of the slope of the Bahama carbonate platform. They are marked by
lithofacies and sedimentation rate changes in the same interval.
- These results confirm that high-resolution analyses of magnetic
properties could be used as an effective indicator of paleoceanography.