GLGY 301 Lecture Notes - Lecture 18: Mid-Ocean Ridge, Intermontane Belt, Hydrothermal Vent
20 Jun 2020
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Document Summary
The importance of western canadian serpentinites for the economy, society, and the earth system. Intermontane serpentinites are associated with ancient island arcs or oceanic. Serpentinites are throughout intermontane (ie central part of mountains) Serpentinites are associated with ancient island arcs. Terranes used to be out in the ocean and they were generated through igneous and tectonic processes that generate an oceanic crust. Some stretches of mid oceanic ridges spread quickly, so they generate basalt on sea oor. Other stretches (eg mid atlantic ridge) are slow spreading, these allow earths mantle to come to sea oor, which interacts with sea water to generate serpentinites. Oceanic crust is generated at mid-ocean ridges and moves off-axis. Juan de fuca is a fast spreading ridge, it generates a lot of basalt. Depending on the rate at which spreading is occurring on ridge axes, we end up with different amount of lava erupting at sea oor and generating basalt.
