Structure of the Laptev Sea Shelf–Eurasian Basin Transition Zone (Arctic Ocean)


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Abstract

Based on obtained data, the paper considers the structure of the sedimentary cover and basement in the continent–ocean transition zone. We analyze the structure of modern tectonic activity zones in the Laptev Sea and structurally similar zones in the Novosibirsk Trough and the De Long Massif. Three sedimentary Anisin–Laptev, Amundsen, and West Laptev basins separated by basement uplifts are distinguished in sedimentary cover. The Anisin–Laptev Basin is separated from the West Laptev Basin by the North Laptev Horst and from the Amundsen Basin by an uplift stretching from the Lomonosov Ridge and covered by the Neogene–Quaternary deposits. The modern tectonic activity zone, marked by a rift valley and earthquakes, stretches across the continental slope from the Gakkel Ridge above a sedimentary rock sequence possessing many-kilometers thickness. The zone reached its present-day position in the Pliocene. Near the shelf boundary, the zone bifurcates, with one branch departing into the West Laptev Basin, and the other branch departing into grabens that developed to the west of New Siberian Islands forming the Laptev microplate.

About the authors

A. L. Piskarev

Gramberg All-Russia Research Institute of Geology and Mineral Resources of the World Ocean; Institute of Earth Sciences, St. Petersburg State University

Author for correspondence.
Email: apiskarev@gmail.com
Russian Federation, St. Petersburg, 190121; St. Petersburg, 199134

G. P. Avetisov

Gramberg All-Russia Research Institute of Geology and Mineral Resources of the World Ocean

Email: apiskarev@gmail.com
Russian Federation, St. Petersburg, 190121

A. A. Kireev

Gramberg All-Russia Research Institute of Geology and Mineral Resources of the World Ocean

Email: apiskarev@gmail.com
Russian Federation, St. Petersburg, 190121

G. S. Kazanin

Marine Arctic Geological Expedition

Email: apiskarev@gmail.com
Russian Federation, Murmansk, 183012

V. A. Poselov

Gramberg All-Russia Research Institute of Geology and Mineral Resources of the World Ocean

Email: apiskarev@gmail.com
Russian Federation, St. Petersburg, 190121

V. A. Savin

Gramberg All-Russia Research Institute of Geology and Mineral Resources of the World Ocean

Email: apiskarev@gmail.com
Russian Federation, St. Petersburg, 190121

O. E. Smirnov

Gramberg All-Russia Research Institute of Geology and Mineral Resources of the World Ocean

Email: apiskarev@gmail.com
Russian Federation, St. Petersburg, 190121

D. V. Elkina

Gramberg All-Russia Research Institute of Geology and Mineral Resources of the World Ocean; Institute of Earth Sciences, St. Petersburg State University

Email: apiskarev@gmail.com
Russian Federation, St. Petersburg, 190121; St. Petersburg, 199134

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