Figure 7.
Late Paleocene thermal maximum (LPTM) as observed in selected downhole
measurements at Site 1001. The log response at 240.8 mbsf is consistent
with the recovered claystone interval that contains the negative 13C
excursion marking the LPTM. The location of onset and termination of
magnetochron C24r is also determined by downhole measurements (i.e., GHMT, V.
Louvel and B. Galbrun, unpubl. data). The best estimate for the onset of the
LPTM is 55.542 Ma, assuming a sedimentation rate of 37.4 m/m.y. based on
nannofossil identification (Sigurdsson, Leckie, Acton, et al., 1997) and
employing the Cande and Kent (1995) time scale. Note the distinct difference in
resistivity above and below the LPTM and the short transition to lower
resistivities prior to the LPTM.