TY - JOUR

T1 - New insights into tectonics and evolution of the Amerasia Basin

AU - Chernykh, A.

AU - Glebovsky, V.

AU - Zykov, M.

AU - Korneva, M.

PY - 2018/9/1

Y1 - 2018/9/1

N2 - Two alternative tectonic models for the formation of the Amerasia Basin are presented. The models provide a series of paleoreconstructions based on comprehensive analysis of bathymetry, gravity, and magnetic fields of the Arctic region, combined with available seismic survey and geological data. The two equally probable alternatives for the kinematics behind the early stage formation of the proto-Canada Basin, rely on three alternative age models for the timing of the tectonic events. The first two models date the opening of the central, oceanic part of the Canada Basin to before or after ∼124 Ma. The third model considers that the formation of the entire basin, including the lateral parts, occurred after ∼125 Ma. Six possible plate kinematic models have been developed by combining the three age models with the two series of the paleoreconstructions; i.e. two “older” kinematic models (1A and 1B) and four “younger” ones (2A, 2B, 3A, and 3B). The preferred option is the “older” models, which suggests that the first stage of the Canada Basin formation took place in the Jurassic – Berriasian, and that the central oceanic part of the Basin was developed in Valanginian (?) – Barremian. This concurs with the active phase of the final stage of the Arctida craton breakup and the main phase of the High Arctic Igneous Province emplacement. Large sinistral strike-slip, i.e. the Alpha-Chukchi and Alpha-Mendeleev fracture zones, as well as an inferred dextral Podvodnikov-Mendeleev fracture zone, were developed during the Arctida breakup process. The formation of the fracture zones contributed to the opening of the Nautilus, Makarov and Podvodnikov basins in the Valanginian (?)/Barremian – Campanian. Presumably, there were different geodynamic drivers for the processes at the two stage formation of the Amerasia Basin: subduction of an ancient oceanic lithosphere outside of the study area at the early stage, and an Arctic mantle plume at the late stage.

AB - Two alternative tectonic models for the formation of the Amerasia Basin are presented. The models provide a series of paleoreconstructions based on comprehensive analysis of bathymetry, gravity, and magnetic fields of the Arctic region, combined with available seismic survey and geological data. The two equally probable alternatives for the kinematics behind the early stage formation of the proto-Canada Basin, rely on three alternative age models for the timing of the tectonic events. The first two models date the opening of the central, oceanic part of the Canada Basin to before or after ∼124 Ma. The third model considers that the formation of the entire basin, including the lateral parts, occurred after ∼125 Ma. Six possible plate kinematic models have been developed by combining the three age models with the two series of the paleoreconstructions; i.e. two “older” kinematic models (1A and 1B) and four “younger” ones (2A, 2B, 3A, and 3B). The preferred option is the “older” models, which suggests that the first stage of the Canada Basin formation took place in the Jurassic – Berriasian, and that the central oceanic part of the Basin was developed in Valanginian (?) – Barremian. This concurs with the active phase of the final stage of the Arctida craton breakup and the main phase of the High Arctic Igneous Province emplacement. Large sinistral strike-slip, i.e. the Alpha-Chukchi and Alpha-Mendeleev fracture zones, as well as an inferred dextral Podvodnikov-Mendeleev fracture zone, were developed during the Arctida breakup process. The formation of the fracture zones contributed to the opening of the Nautilus, Makarov and Podvodnikov basins in the Valanginian (?)/Barremian – Campanian. Presumably, there were different geodynamic drivers for the processes at the two stage formation of the Amerasia Basin: subduction of an ancient oceanic lithosphere outside of the study area at the early stage, and an Arctic mantle plume at the late stage.

KW - Alpha and Mendeleev ridges

KW - Amerasia Basin

KW - Canada Basin

KW - Gravity and magnetic anomalies

KW - Kinematic model

KW - Large igneous province

KW - Paleoreconstruction

KW - Tectonic interpretation

KW - Alpha and Mendeleev ridges

KW - Amerasia Basin

KW - Canada Basin

KW - Gravity and magnetic anomalies

KW - Kinematic model

KW - Large igneous province

KW - Paleoreconstruction

KW - Tectonic interpretation

KW - MENDELEEV RIDGE

KW - ALPHA-RIDGE

KW - GRAVITY

KW - ARCTIC-OCEAN

KW - MAKAROV BASIN

KW - SEA-FLOOR

KW - LARGE IGNEOUS PROVINCE

KW - LOMONOSOV RIDGE

KW - CANADA BASIN

KW - CRUSTAL STRUCTURE

UR - http://www.scopus.com/inward/record.url?scp=85044030062&partnerID=8YFLogxK

U2 - 10.1016/j.jog.2018.02.010

DO - 10.1016/j.jog.2018.02.010

M3 - Article

VL - 119

SP - 167

EP - 182

JO - Journal of Geodynamics

JF - Journal of Geodynamics

SN - 0264-3707

ER -