Passive margin | Wikipedia audio article

This is an audio version of the Wikipedia Article:


00:00:37 1 Global distribution
00:01:19 2 Key components
00:01:28 2.1 Active vs. passive margins
00:02:34 2.2 Morphology
00:04:15 2.3 Cross-section
00:05:45 3 Subsidence mechanisms
00:07:55 4 Classification
00:09:14 4.1 Geometry of passive margins
00:09:24 4.1.1 Rifted margin
00:09:51 4.1.2 Sheared margin
00:10:40 4.1.3 Transtensional margin
00:10:58 4.2 Nature of transitional crust
00:11:33 4.2.1 Non-volcanic rifted margin
00:12:00 4.2.2 Volcanic rifted margin
00:15:06 4.3 Heterogeneity of transitional crust
00:15:16 4.3.1 Simple transitional crust
00:15:39 4.3.2 Complex transitional crust
00:16:01 4.4 Sedimentation
00:16:52 4.4.1 Constructional
00:18:40 4.4.2 Starved
00:19:09 5 Formation
00:20:30 6 Economic significance
00:21:57 7 Law of the Sea
00:22:26 8 See also



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SUMMARY
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A passive margin is the transition between oceanic and continental lithosphere that is not an active plate margin. A passive margin forms by sedimentation above an ancient rift, now marked by transitional lithosphere. Continental rifting creates new ocean basins. Eventually the continental rift forms a mid-ocean ridge and the locus of extension moves away from the continent-ocean boundary. The transition between the continental and oceanic lithosphere that was originally created by rifting is known as a passive margin.