Chukchi Plateau and Chukchi Basin
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The Chukchi Plateau can be described as a fragment of the continental margin jutted into the abyssal part of the Arctic Ocean. The Chukchi Plateau has the most direct connection with the adjacent shelf of the East Siberian - Chukchi continental margin. The principal structural complexes of the consolidated continental crust continue uninterrupted between the Mendeleev Ridge and Chukchi Plateau with total thickness of 26–29 km and approximately equal thickness of the upper and lower crusts under the Chukchi Plateau.
In the Chukchi Basin the Earth’s crust is 20 km thick with upper crust – 3 km. The Chukchi Basin, with its undisturbed sedimentary complexes, also includes 1200 m of pre- Upper Jurassic (Upper Ellesmerian) formations. Almost complete absence of folding and faults in the Chukchi Basin may point to active sedimentation, not the attenuation of the crust, as a principle cause of its subsidence.
Miocene-Pleistocene complex above the pre-Miocene unconformity continues from the Chukchi Basin to the Chukchi Plateau and marks the end of formation of these present-day morphological structures.
KeywordsChukchi Plateau Chukchi Basin East Siberian-Chukchi continental margin Morphological structures Sedimentary seaquences Continental crust
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