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Minerals Report - International Seabed Authority

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The continental rises also contain considerable accumulations of<br />

sediment (often in excess of 1 km), and probably include organic-rich source<br />

rocks deposited when the proto-ocean basins were narrow and had restricted<br />

circulation (Rona, 1969; Schneider, 1969). The abyssal plains probably contain<br />

insufficient thickness of sediments (less than 1 km) to yield hydrocarbon<br />

accumulations. Parts of the deep trenches may be more favourable, as may<br />

some foundered remnants of continental blocks broken off during continental<br />

rifting.<br />

Areas that contain wide continental shelves with sediment thickness in<br />

excess of 1 km (Figure 24), and hence are favourable for hydrocarbon deposits<br />

occur throughout the sub-arctic (north of 60°N) including the coasts of:<br />

Greenland, Norway, Alaska, northern Canada and Russia. In the Arctic<br />

Ocean, sedimentary thickness often exceed 4 km.<br />

IINTERNATIONAL SEABED AUTHORITY 721

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