Erlenkeuser and von Grafenstein: Stable Oxygen Isotope Ratios in Benthic Carbonate Shells
513
-s
o ,~~~~~~~~~~~~~~~
-6
delta-1SO, norm .. %oPDB
-4
-2
0
2
4
6
10
20
E
~
a
~3O
~
'" ~ 40
50
, .
. .
Transects N, L, Y
60 4---------------------~~------~
delta-1S0, norm., %oPDB
' "
0
0
0
+
/:"
¢
6
-S -6 -4 -2 0 2 4
O ~~~~~~~~~~
6
-S -6 -4 -2 0 2 4
O ~~~~~~~+u~~
10
20 :: ) 10,
' 0 ~
E
~
a
~3O
Q;
~ 40
Transect N
10
.,
.. 2
.00:
...... 1 ;
20
• Oi a:, ,
ttl .
C)'
40
50
. 9
Transect L
60 ~----------------~ 60 ~----------------~
Bivalvla
Foraminifera
Elphidium
Ostracoda
Cytheropleron
Helerocyprideis
Rabimllls
Sarslcy1heridea
(var. spedes)
-S -6 -4 -2 0 2
O ~~~~~~~~~
4
6
10 :. 1 ;,
:: 2~ ~ 0 : ... ' ~
20 : 6 9
.A. \2.. . .
;j 35 7 10
". g
30
40
50
60
- :8
:m
11 ·
12 :
~
o
:-...
Figure 5: Stable oxygen isotope composition in benthic shell carbonates, collected Aug./Sept. 1993 and 1994
from surface sediment samples of the Laptev Sea, in relation to water depth. The data represent mean values of
single shell measurements of variable number. Vital offsets have been corrected for. - Arrows and labels
(numbers) identify sampling stations along the resp. transects (cf. Figure I, Figure 4).
Acknowledgements
Our colleagues of the Transdrift expeditions did a hard days' work to gain the surface
sediments from the Laptev Sea. The isotope analyses, in particular those on the the subminimum samples, would not have succeeded without the work of Hans H. Cordt and Heinz
Heckt. We gratefully acknowledge all their help. We are obliged to the Russian partners who
provided the temperature and salinity data shown in Figure 2. And we appreciate the
experienced advice and help of T. Cronin with the taxonomy of the ostracoda. This study is