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VOLUME AND PECULIARITIES OF SPACE DISTRIBUTION OF THE MID-OCEANIC RIDGE VOLCANISM
O.V. Kuvikas
Kamchatka State University, 683032, Petropavlovsk-Kamchatsky, Pogranichnaya street, 4
Rates of movement of tectonic plates 70 60
50
70 60
4,9 5,4
50
40
40
30 20 10
0 10
30
2,7 6.8
20
2,8
10
13
0 10
20
4.1
30
3.6
40
20 6.4 5.9
30 40
50
50
60
60
70
70
Http://www.ngdc.noaa.gov./mgg/
Volumes of erupted rocks in the East-Pacific Rise (km3/km in one million years) Extension – 7548 km
20 20-30 N.L.
10
10 20 30 40
Latitude, degrees
0
10-20 N.L. 0-10 N.L. 0-10 S.L. 10-20 S.L. 20-30 S.L. 30-40 S.L. 0
50
100
150
200 Volume
250
300
350
400
Volumes of erupted rocks in the South-Pacific Rise (km3/km in one million years)
Extension –4518 km
Latitude, degrees
30-40 S.L. 40-50 S.L. 50-60 S.L. 60-70 S.L. 0,00
50,00
100,00 Volume
150,00
200,00
Volumes of erupted rocks in the West-Indian Ridge (km3/km in one million years)
Extension – 4396 km
20-30 S.L.
30 40
Latitude, degrees
20
30-40 S.L. 40-50 S.L. 50-60 S.L.
50 60
0,00
5,00
10,00
15,00
20,00
Volume
25,00
30,00
35,00
Volumes of erupted rocks in the Central-Indian Ridge (km3/km in one million years) Extension – 8215 km
Latitude, degrees
20-30 S.L.
30-40 S.L.
40-50 S.L.
50-60 S.L.
60-70 S.L. 0,00
20,00
40,00
60,00
80,00
Volume
100,00 120,00 140,00
Volumes of erupted rocks in the Carlsberg Ridge (km3/km in one million years) Extension – 8215 km
10 0 10
20 30
Latitude, degrees
10-20 N.L. 0-10 N.L. 0-10 S.L. 10-20 S.L. 20-30 S.L. 0,00
20,00
40,00
60,00
Volume
80,00
100,00
Volumes of erupted rocks in the Mid-Atlantic Ridge (km3/km in one million years) Extension – 15029km
70
65-70 N.L.
60
50-55 N.L.
40
35-40 N.L.
30 20 10 0 10 20
Latitude, degrees
50
20-25 N.L. 5-10 N.L. 5-10 S.L. 25-20 S.L. 35-40 S.L.
30 50 60 70
50-55 S.L. 0
20
40
60
Volume
80
100
Huan de Fuka Ridge Extension – 2020 km
Galapagos Ridge Extension – 2020 km
Chile Rise Extension – 1598 km East-Pacific Rise Huan de Fuka Ridge Carlsberg Ridge West-Indian Ridge Mid-Atlantic Ridge 1 Galapagos Ridge Chile Rise South-Pacific Rise Central-Indian Ridge 0,00
0,50
1,00
1,50
2,00
The rate separation and volume the mid-oceanic ridges Gakkel Ridge 70 60
70 60
50 Huan de Fuka Ridge 40
50
30
30
20
20
10
10
40
Galapagos
0 10
0 10
20
20
30
30
40
40
50
50
60
60
70
70
0
20
40
60
80
100
120
140
160
(km3/km in one million years)
Eiler proposition V.Hain, M. Lomise (1995)
Resume The general volume of magma material delivered by all ridges (MORs) makes up 4.67 km3 at 1.5 km thickness of the oceanic crust second layer and 6.23 km3 per year at 2 km thickness of the oceanic crust second layer. Whereas according to the Gushenko data surface volcanism delivers about 1 km3 per year. For each MOR the volumes of magma material for one year and 1 million years were calculated. The rates of spreading were determined. The diagrams of dependence of distributions of a volcanic material are constructed. The analysis of the received material shows that submarine volcanic activity depends not only on poles of rotation of lithospheric plates, but also on poles of rotation of the Earth.
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