618
Land-Ocean Systems in the Siberian Arctic: Dynamics and History
Table 1: Key data and position of the core holes.
Core No. Sea
Latitude
Longitude
Water de~th (m)
Core length (m)
17
Chukchi
72°04.0N
164°53.0 W
40.0
1.79
21
Chukchi
71 °05.0 N
164°50.0W
43.0
2.71
23
Chukchi
71°47.0N
168 0 34.0 W
49.0
3.42
25
Chukchi
70°11.0 N
164°38.0W
38.0
1.61
86
Chukchi
69°31.0 N
166 0 15.4 W
39.0
0.37
81
Chukchi
68°21.0 N
167°15.0W
38.0
0.30
11
Chukchi
66°23.0 N
167°10.0W
46.0
2.30
45
Chukchi
66°10.0 N
168 0 23.0 W
52.4
4.25
87
Chukchi
67 0 55.0 N
169°46.0 W
50.0
3.41
40
Chukchi
69°22.5 N
171°08.0W
51.0
3.50
42
Chukchi
68°10.0 N
173 0 41.0 W
49.0
3.30
105
Chukchi
68 0 12.5 N
173 0 58.0 W
43.0
0.70
113
Chukchi
70°02.5 N
176"08.5 W
54.0
0.80
116
Chukchi
70°33.0 N
176°01.0W
61.0
1.60
38
Chukchi
70 0 56.0 N
179°41.0 W
49.0
1.22
12
Chukchi
69 0 30.0 N
178 0 30.5 W
25.0
0.96
298
East Siberian
70 0 35.0 N
172°40.0 E
21.0
2.81
299
East Siberian
70 0 10.0N
172°37.0 E
27.0
0.79
80
East Siberian
69 0 54.0 N
167°39.8 E
17.5
2.07
30
East Siberian
69°54.0 N
lW19.0E
30.0
1.92
70
East Siberian
69°51.0 N
165 0 10.0 E
22.0
0.71
27
East Siberian
69 0 38.0 N
164 0 49.0 E
14.5
1.40
300
East Siberian
71 0 09.3 N
160 0 32.9 E
15.0
0.90
296
East Siberian
7l 0 11.4N
160°21.1 E
18.0
0.42
319
East Siberian
72°1O.0N
153 0 25.0 E
19.0
0.58
321
East Siberian
72 0 40.7 N
150°30.3 E
15.0
0.36
322
East Siberian
72 0 54.9 N
148°56.8 E
14.0
0.55
330
Laptev
72°27.5 N
135 0 24.8 E
28.0
1.28
1372
Kara
70 0 19.2 N
60 0 08.0 E
170.0
3.10
1375
Kara
69 0 44.5 N
65°49.5 E
30.0
2.70
1382
Kara
72 0 00.4 N
62°01.7 E
130.0
3.10
1385
Kara
71°27.3N
64 0 52.1 E
120.0
2.90
1401
Kara
73 0 19.1 N
61028.6 E
138.0
1.65
1403
Kara
73 0 48.4 N
58 0 43.4 E
290.0
1.56
1405
Kara
72 0 42.3 N
58 0 16.7 E
380.0
3.00
1407
Kara
72°15.0N
60°44.1 E
125.0
3.30
1273
Barents
74°24.5 N
45 0 44.5 E
312.0
4.25
1275
Barents
73°42.0 N
46 0 35.4 E
330.0
1.35
1280
Barents
69 0 47.9 N
50 0 51.7 E
80.0
3.24
1328
Barents
75 0 29.2 N
57 0 17.3 E
91.0
2.55
1341
Barents
78°48.9 N
58°01.0 E
150.0
0.75
1369
Barents
70 0 28.2N
33 0 21.3 E
250.0
2.85
1410
Barents
69°45.9 N
53°52.9 E
75.0
2.00
594
Barents
70 0 19.4 N
41 0 40.0 E
86.0
3.60
582
Barents
70°03.0 N
37°12.0 E
160.0
4.60
26
Barents
70 0 15.4 N
41 0 25.3 E
202.0
33.0
seas. Distribution of forams (Saidova, 1994) and diatoms (Polyakova, 1990, 1997a) in the
Chukchi sea sediments are known sufficiently well. The author studied several cores (Table 1)
recovered at various depths ranging from 9 m to 61 m. Maximum thickness of core sediments
reached 4.2 m (Figure 1). Variations of species number and composition and correlation
between ecological and biogeographical diatom groups allowed distinguishing six ecozones,
which reflect paleogeographical changes in the Chukchi Sea during the end of Late Pleistocene
and Holocene The latter are well manifested by Core 17 and Core 23 recovered from the northeastern part of the sea.
Land-Ocean Systems in the Siberian Arctic: Dynamics and History
Table 1: Key data and position of the core holes.
Core No. Sea
Latitude
Longitude
Water de~th (m)
Core length (m)
17
Chukchi
72°04.0N
164°53.0 W
40.0
1.79
21
Chukchi
71 °05.0 N
164°50.0W
43.0
2.71
23
Chukchi
71°47.0N
168 0 34.0 W
49.0
3.42
25
Chukchi
70°11.0 N
164°38.0W
38.0
1.61
86
Chukchi
69°31.0 N
166 0 15.4 W
39.0
0.37
81
Chukchi
68°21.0 N
167°15.0W
38.0
0.30
11
Chukchi
66°23.0 N
167°10.0W
46.0
2.30
45
Chukchi
66°10.0 N
168 0 23.0 W
52.4
4.25
87
Chukchi
67 0 55.0 N
169°46.0 W
50.0
3.41
40
Chukchi
69°22.5 N
171°08.0W
51.0
3.50
42
Chukchi
68°10.0 N
173 0 41.0 W
49.0
3.30
105
Chukchi
68 0 12.5 N
173 0 58.0 W
43.0
0.70
113
Chukchi
70°02.5 N
176"08.5 W
54.0
0.80
116
Chukchi
70°33.0 N
176°01.0W
61.0
1.60
38
Chukchi
70 0 56.0 N
179°41.0 W
49.0
1.22
12
Chukchi
69 0 30.0 N
178 0 30.5 W
25.0
0.96
298
East Siberian
70 0 35.0 N
172°40.0 E
21.0
2.81
299
East Siberian
70 0 10.0N
172°37.0 E
27.0
0.79
80
East Siberian
69 0 54.0 N
167°39.8 E
17.5
2.07
30
East Siberian
69°54.0 N
lW19.0E
30.0
1.92
70
East Siberian
69°51.0 N
165 0 10.0 E
22.0
0.71
27
East Siberian
69 0 38.0 N
164 0 49.0 E
14.5
1.40
300
East Siberian
71 0 09.3 N
160 0 32.9 E
15.0
0.90
296
East Siberian
7l 0 11.4N
160°21.1 E
18.0
0.42
319
East Siberian
72°1O.0N
153 0 25.0 E
19.0
0.58
321
East Siberian
72 0 40.7 N
150°30.3 E
15.0
0.36
322
East Siberian
72 0 54.9 N
148°56.8 E
14.0
0.55
330
Laptev
72°27.5 N
135 0 24.8 E
28.0
1.28
1372
Kara
70 0 19.2 N
60 0 08.0 E
170.0
3.10
1375
Kara
69 0 44.5 N
65°49.5 E
30.0
2.70
1382
Kara
72 0 00.4 N
62°01.7 E
130.0
3.10
1385
Kara
71°27.3N
64 0 52.1 E
120.0
2.90
1401
Kara
73 0 19.1 N
61028.6 E
138.0
1.65
1403
Kara
73 0 48.4 N
58 0 43.4 E
290.0
1.56
1405
Kara
72 0 42.3 N
58 0 16.7 E
380.0
3.00
1407
Kara
72°15.0N
60°44.1 E
125.0
3.30
1273
Barents
74°24.5 N
45 0 44.5 E
312.0
4.25
1275
Barents
73°42.0 N
46 0 35.4 E
330.0
1.35
1280
Barents
69 0 47.9 N
50 0 51.7 E
80.0
3.24
1328
Barents
75 0 29.2 N
57 0 17.3 E
91.0
2.55
1341
Barents
78°48.9 N
58°01.0 E
150.0
0.75
1369
Barents
70 0 28.2N
33 0 21.3 E
250.0
2.85
1410
Barents
69°45.9 N
53°52.9 E
75.0
2.00
594
Barents
70 0 19.4 N
41 0 40.0 E
86.0
3.60
582
Barents
70°03.0 N
37°12.0 E
160.0
4.60
26
Barents
70 0 15.4 N
41 0 25.3 E
202.0
33.0
seas. Distribution of forams (Saidova, 1994) and diatoms (Polyakova, 1990, 1997a) in the
Chukchi sea sediments are known sufficiently well. The author studied several cores (Table 1)
recovered at various depths ranging from 9 m to 61 m. Maximum thickness of core sediments
reached 4.2 m (Figure 1). Variations of species number and composition and correlation
between ecological and biogeographical diatom groups allowed distinguishing six ecozones,
which reflect paleogeographical changes in the Chukchi Sea during the end of Late Pleistocene
and Holocene The latter are well manifested by Core 17 and Core 23 recovered from the northeastern part of the sea.