Earth Sciences 1022A/B Lecture Notes - Lecture 19: Graded Bedding, Abyssal Plain, Subduction

• School: Western University
• Department: Earth Sciences
• Course: Earth Sciences 1022A/B
• Professor: Hitchcock

Document Summary

Earth sciences 1022b lecture brief 23 feb 16. Mapping the ocean floor is done by comparing multibeam sonar and satellite images. Some extend from river valleys carved during glaciations, others form by earthquake induced turbidity currents of dense sediment-rich water eroding the shelf and slope. Turbidity currents form turbidites with graded bedding (coarse particles on bottom) active continental margins where oceanic lithosphere is subducted under cont. lithosphere; narrow continental shelf, edge of deep-ocean trench is the cont. slope. Mid-ocean ridges: interconnected system that is the longest topographic feature on.