Model data repository of "Styles of Trench-parallel Mid-ocean Ridge Subduction Affect Cenozoic Geological Evolution in circum-Pacific Continental Margins"
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This dataset contains the data used in Wu et al. (2022): "Trench-parallel Mid-ocean Ridge Subduction Affect Cenozoic Geological Evolution in circum-Pacific Continental Margins".Keywords:
Continental Margin
Summary A transect of four coreholes, drilled by the Glomar Challenger across the Irish continental margin at the Goban Spur, evidences a dynamic palaeoceanographic regime during the late Mesozoic and Cenozoic. Shallow marine waters invaded the rift-stage grabens of the Goban Spur in the early Barremian. Thereafter, the margin subsided rapidly, producing a pelagic depositional regime by late Barremian time. Deep marine conditions were maintained as sea-floor spreading began in the early Albian, and chiefly pelagic deposition continued to the present. Among a series of significant post-rift oceanographic changes, one of the most notable is the familiar fluctuation of oxic and anoxic sea-floor environments during the Cenomanian and Turonian. Another marked change took place during the late Palaeocene, when cooler, oxygen-rich, northern bottom waters reached the Goban Spur as a consequence of rifting and sea-floor spreading between Greenland, Rockall Plateau, and Norway. Later during the Cenozoic, the initial production of Antarctic bottom water, several accelerations of polar icecap growth, and fluctuating eustatic sea-level produced a variety of circulatory shifts on the Goban Spur. A particularly significant sedimentological consequence of these interacting processes was the widespread creation of numerous erosional and non-depositional unconformities.
Continental Margin
Margin (machine learning)
Circulation (fluid dynamics)
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A general theory for forced barotropic long trench waves in the presence of linear bottom friction is presented. Two specific forcing mechanisms are considered: (i) transverse fluctuations in a western boundary current as it flows across a trench, and (ii) a traveling wind system that moves parallel to the trench. The mechanisms (i) and (ii) are applied to the Japan-Kuril trench and Aleutian trench, respectively. In the case of the Japan-Kuril trench it is found that 3-month period fluctuations in the Kuroshio are able to generate currents along the trench of 0 (10 cm s−1) and coastal sea level variations of O (7 cm). In the case of the Aleutian trench, traveling wind systems in the northeast Pacific may produce a near resonant response. Such a response consists of velocity fluctuations of 0 (10 cm s−1) along the trench and of 0 (4 cm s−1) across the trench, the coastal sea level fluctuations can be up to 12 cm. While these estimates should be regarded as tentative because of the uncertainty in the value of the bottom friction coefficient, they nevertheless suggest that trench wave motions could produce significant long-time scale velocity and sea level fluctuations in the North Pacific trenches.
Barotropic fluid
Forcing (mathematics)
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