138 Peter Stille and Graham Shields
19.20
(~
0 Pacific t AT[ 4NT/C ]NOIAN
0 "At l ant i c"
I
19.t0 -,,~~., "o ~
19.00
n
18.90
J3
n
18,80
18.70 -
Orake Pass~
~
f
IV'
Rise O
SEIR
18.60
.-~
..........
,...~.
,...t
..~ _
180~
120~/
60*W
0
60~
120~163 IBO~
i O O O O
_
te.Ts
~
o
o
o
-' L
18. 70
Acc
18.65
,"
']11
Chile
O Rise
W
E
18.60
,
I , , , 9 . t
, , I , . I , .
ISO*E
180 e
150*W
120"W
90*W
60*W
30=W
Fig. 5.33 Pb isotope ratios of marine ferromanaganese nodules show distinct variability
even within one ocean basin. (Abouchami and Goldstein 1995)
Isotopic exchange between the Pacific waters and the circum-Antarctic ocean can
first be ascertained in the straits between Australia and New Zealand. Manganese
nodules from the western A-Atlantic and the more northerly basin of Argentina
show identical Pb isotope ratios to those of the A-Pacific (Fig. 5.33, 5.34). Pb in
19.20
(~
0 Pacific t AT[ 4NT/C ]NOIAN
0 "At l ant i c"
I
19.t0 -,,~~., "o ~
19.00
n
18.90
J3
n
18,80
18.70 -
Orake Pass~
~
f
IV'
Rise O
SEIR
18.60
.-~
..........
,...~.
,...t
..~ _
180~
120~/
60*W
0
60~
120~163 IBO~
i O O O O
_
te.Ts
~
o
o
o
-' L
18. 70
Acc
18.65
,"
']11
Chile
O Rise
W
E
18.60
,
I , , , 9 . t
, , I , . I , .
ISO*E
180 e
150*W
120"W
90*W
60*W
30=W
Fig. 5.33 Pb isotope ratios of marine ferromanaganese nodules show distinct variability
even within one ocean basin. (Abouchami and Goldstein 1995)
Isotopic exchange between the Pacific waters and the circum-Antarctic ocean can
first be ascertained in the straits between Australia and New Zealand. Manganese
nodules from the western A-Atlantic and the more northerly basin of Argentina
show identical Pb isotope ratios to those of the A-Pacific (Fig. 5.33, 5.34). Pb in