scholarly journals Chapter 13: Modern Plate Tectonic Regime of the Continental Margin of western Canada

1991 ◽  
Author(s):  
R P Riddihough ◽  
R D Hyndman
Keyword(s):  
Continental Margin ◽  
Western Canada ◽  
Plate Tectonic ◽  
Tectonic Regime

Bathymetric map of the continental margin of western Canada

1975 ◽  
Author(s):  
D A Seemann ◽  
D L Tiffin
Keyword(s):  
Continental Margin ◽  
Western Canada ◽  
Bathymetric Map

scholarly journals Effects of Cenozoic subduction along the outboard margin of the Northern Cordillera: Derived from e-book on the Northern Cordillera (Alaska and Western Canada) and adjacent marine areas

Geosphere ◽  
2019 ◽  
Vol 16 (1) ◽  
pp. 33-61
Author(s):  
Warren J. Nokleberg ◽  
David W. Scholl ◽  
Thomas K. Bundtzen ◽  
David B. Stone
Keyword(s):  
Continental Margin ◽  
Subduction Zones ◽  
Hot Springs ◽  
Sedimentary Basins ◽  
Oceanic Lithosphere ◽  
Popular Science ◽  
Strike Slip ◽  
Western Canada ◽  
Regional Effects ◽  
Marine Areas

Abstract This article describes the regional effects of Cenozoic subduction along the outboard margin of the Northern Cordillera (Alaska, USA, and Western Canada), and thereby acquaints the reader with several chapters of the e-book Dynamic Geology of the Northern Cordillera (Alaska, Western Canada, and Adjacent Marine Areas). This article and the e-book are written for earth-science students and teachers. The level of writing for the article and the source e-book is that of popular science magazines, and readers are encouraged to share this article with students and laypersons. The main thrust of the article is to present and describe a suite of ten regional topographic, bathymetric, and geologic maps, and two figures portraying deep-crustal sections that illustrate the regional effects of Cenozoic subduction along the outboard margin of the North American Cordillera. The regional maps and cross sections are described in a way that a teacher might describe a map to students. Cenozoic subduction along the margin of the Northern Cordillera resulted in the formation of the following: (1) underthrusting of terranes and oceanic lithosphere beneath Southern Alaska; (2) landscapes, including narrow continental shelves along Southern and Southeastern Alaska and Western Canada (the Canadian Cordillera) and continental-margin mountain ranges, including the Alaska Peninsula, Chugach Range, Saint Elias Mountains, and Cascade Mountains; (3) sedimentary basins; (4) an array of active continental strike-slip and thrust faults (inboard of subduction zones); (5) earthquake belts related to subduction of terranes and oceanic plates; (6) active volcanoes, including continental-margin arcs (the Aleutian, Wrangell, and Cascade Arcs) linked to subduction zones, and interior volcanic belts related to strike-slip faulting or to hot spots; (7) lode and placer mineral deposits related to continental margin arcs or subduction of oceanic ridges; (8) hot springs related to continental-margin arcs; (9) plate movements as recorded from GPS measurements; and (10) underthrusting of terranes and oceanic lithosphere beneath the Northern Cordillera.

Neotectonics seismicity in the south-eastern Beaufort Sea polar continental margin of north-western Canada

1998 ◽  
Vol 27 (2) ◽  
pp. 175-190 ◽  
Author(s):  
R.a. Stephenson ◽  
E.i Smolyaninova
Keyword(s):  
Continental Margin ◽  
Beaufort Sea ◽  
Western Canada ◽  
The South ◽  
South Eastern ◽  
North Western

The tectonic regime of the southeastern Mediterranean continental margin

1984 ◽  
Vol 55 (3-4) ◽  
pp. 365-386 ◽  
Author(s):  
Yossi Mart
Keyword(s):  
Continental Margin ◽  
Tectonic Regime

scholarly journals Mariana-type ophiolites constrain the establishment of modern plate tectonic regime during Gondwana assembly

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jinlong Yao ◽  
Peter A. Cawood ◽  
Guochun Zhao ◽  
Yigui Han ◽  
Xiaoping Xia ◽  
...  
Keyword(s):  
Subduction Zones ◽  
Oceanic Lithosphere ◽  
Surface Erosion ◽  
Plate Tectonic ◽  
Mountain Ranges ◽  
Tectonic Regime ◽  
Subduction Initiation ◽  
The Earth ◽  
Tethys Ocean ◽  
Roll Back

AbstractInitiation of Mariana-type oceanic subduction zones requires rheologically strong oceanic lithosphere, which developed through secular cooling of Earth’s mantle. Here, we report a 518 Ma Mariana-type subduction initiation ophiolite from northern Tibet, which, along with compilation of similar ophiolites through Earth history, argues for the establishment of the modern plate tectonic regime by the early Cambrian. The ophiolite was formed during the subduction initiation of the Proto-Tethys Ocean that coincided with slab roll-back along the southern and western Gondwana margins at ca. 530-520 Ma. This global tectonic re-organization and the establishment of modern plate tectonic regime was likely controlled by secular cooling of the Earth, and facilitated by enhanced lubrication of subduction zones by sediments derived from widespread surface erosion of the extensive mountain ranges formed during Gondwana assembly. This time also corresponds to extreme events recorded in climate and surface proxies that herald formation of the contemporary Earth.

Oceanic-ridge subduction vs. slab break off: Plate tectonic evolution along the Baja California Sur continental margin since 15 Ma

Geology ◽  
2006 ◽  
Vol 34 (1) ◽  
pp. 13 ◽  
Author(s):  
F. Michaud ◽  
J.Y. Royer ◽  
J. Bourgois ◽  
J. Dyment ◽  
T. Calmus ◽  
...  
Keyword(s):  
Continental Margin ◽  
Tectonic Evolution ◽  
Baja California ◽  
Baja California Sur ◽  
Plate Tectonic ◽  
Oceanic Ridge ◽  
Ridge Subduction

scholarly journals The evolution of plate tectonics

2018 ◽  
Vol 376 (2132) ◽  
pp. 20170406 ◽  
Author(s):  
Robert J. Stern
Keyword(s):  
Plate Tectonics ◽  
Dominant Mode ◽  
Plate Tectonic ◽  
Magma Ocean ◽  
Tectonic Regime ◽  
Climate Crisis ◽  
Earth Dynamics ◽  
Multiple Episodes ◽  
Lines Of Evidence ◽  
Standing Question

To understand how plate tectonics became Earth's dominant mode of convection, we need to address three related problems. (i) What was Earth's tectonic regime before the present episode of plate tectonics began? (ii) Given the preceding tectonic regime, how did plate tectonics become established? (iii) When did the present episode of plate tectonics begin? The tripartite nature of the problem complicates solving it, but, when we have all three answers, the requisite consilience will provide greater confidence than if we only focus on the long-standing question of when did plate tectonics begin? Earth probably experienced episodes of magma ocean, heat-pipe, and increasingly sluggish single lid magmatotectonism. In this effort we should consider all possible scenarios and lines of evidence. As we address these questions, we should acknowledge there were probably multiple episodes of plate tectonic and non-plate tectonic convective styles on Earth. Non-plate tectonic styles were probably dominated by ‘single lid tectonics’ and this evolved as Earth cooled and its lithosphere thickened. Evidence from the rock record indicates that the modern episode of plate tectonics began in Neoproterozoic time. A Neoproterozoic transition from single lid to plate tectonics also explains kimberlite ages, the Neoproterozoic climate crisis and the Neoproterozoic acceleration of evolution. This article is part of a discussion meeting issue ‘Earth dynamics and the development of plate tectonics’.

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