5 Isotopic Composition of Seawater 149
ca' }
0
o
0
u~
0
15
10
5
0
1.5
1.0
0.5
0
~5
30
2.5
2.0
1.5
~
-X.\\ \\-.C\ \ \ \ \ -,.\x-..-.., 100
TERTIARY
, ~ CRE-IA C E OU S _~N, , , "~
,
L '
'
t
,
,
~ I ,
0.2o.
0.15
0.10
0.05
0
i
1.09.0
19.5
20.0
20.5
21.0
O.Z.
0.3
0.2
mbsf
O
X)
(p
U
O
O9
<>
u'}
O
u)
O
O
Fig. 5.41. Detailed isotopic study of the K-T boundary of DSDP site 596 in the Pacific
ocean. Os isotope ratios are lowest and Os and |r concentrations are highest in the zone of
shocked quartz marking the boundary. (Peuker-Ehrenbrink et al. 1995)