GLGY 301 Lecture Notes - Lecture 22: Snowbelt, Subduction, Metamorphism
6 May 2016
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Juan de fuca subduction but the rest is tra. Heat flow low because theres no tectonic activity and the crust it very thick under the creaton. Lowest heat flow in canada : hudsons bay area. Measure gravitational acceleration, positive bouger if you have high density rocks. Low density will result in a negative bouger (means crust is less dense in that area ) Shows the low density area under the rockies. Isostatic: shows; (this map shows positive aunomilies because of the pinky-red areas. Max circulation depth : 5 km ( based on pore spaces, there"s not much space for water to flow through ) When the spring snowbelt happenedsthermal springs change seasonaly (seasonal variability chart) temp drops, big seasonal change. Because of this chemical changes, bacteria dies so snail don"t have the food. Hydrothermal ore deposit : zinc and lead traveling up, we get zinc sulfide. Sulfur comes from thermal springs, and deep something.
