Erlenkeuser and von Grafenstein: Stable Oxygen Isotope Ratios in Benthic Carbonate Shells
509
-2
-1
0
10
E 20
£
C. Q)
'0 30
temperature. ' C
salinily. psu
0
2
3
4
5
5
10
15 20 25
30
35
....
. ,: ..
20
30
40
--&- PM9424 7S' S7 'N 136' 44 'E 20 m -0- PM9470 72' 30 'N 130' 30 'E 13 m
PM9421 7S' 30 'N 134' OO 'E 33 m
PM9476 72' 30'N 134' OO ' E 20 m
~l'r- PM9411 7S' 30 'N 124' OO 'E 44 m -+- PM9474 72' OO 'N 134' OO 'E 16 m
--0- PM9431 74' OO 'N 131 ' 30 'E 22 m
Figure 2: Examples of temperature and salinity distribution with water depth in the Laptev Sea, See Figure I for
positions,
E
.c
C. Q)
'E
~
;J:
delta-1S0. %.PDB
-4 -3 -2 - 1 0
1 2 3
6
4 5
-7 -6 -5
O ~~~~~~~~~~~~~~~~~~
10
. :
20
30
40
50
; . 0
:.
~ lY , d
~ : ~ciw : ,
o J~. ~ ~ & ~
~ <> td'~~~o j ttl i···· ..
: Rib .¢~o, Q i
0: ~~ fIl ~
i DC) O--iX i'"
: .~
: . \!!i) ~.
+_. r ' 9 " )( ~ d·
DH5 ~
X!D'fi! ~
i-- iiiD--;f:
laptev Sea 1993. 1994:
sediment surlace samples
60 ~~------------~~~--~~~~~
... B ivalvia
For ami n Ifera
0
Elphidium
Ostracoda
II
Acanthocytherels
0
Cytheropleron
J{
Ellsonella
<>
Heterocyprideis
*
Krithe
+
Normanocythere
+
Rabimilis
l>.
Sarsicytheridea
X
Semicytherura
Exp'd calcite-lS 180
(40m. -1 .S· C, 33.6psu)
Figure 3: Stable oxygen isotope composition of benthic carbonate shells, collected AugJSept. 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 are not corrected for. - The expected equilibrium
Sl80 for calcite precipitated in the 40 m water layer is indicated.