GLGY 301 Lecture Notes - Lecture 2: Carboniferous, Mariana Trench, Wrangellia Terrane
6 May 2016
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Another set of collisons 80 mil years after. What is the type of environment when environment meets the margin: passive margin: following the rifting of supercontinent rodinia at 750 ma: bahamas type environment, No subduction zones, no volcanic islands, coral reefs formed ( now oil traps ) ( more shit?? ) Passive margin: extends for some distance off the land, what theyre showing around extint faults: leftover from when continent rifted apart, normal faults: a pull apart. During the same time period, what types of rocks were forming: fine grained sedimentary, maybe shales, siltstone, mudstones, darker blue area: shales, mudstones, could also form something called chirt ( from silica shells ) Fine grained, black basult: corral rief- an ataul (her notes) Contains volcanic rocks (basalt, andesite, rhyolite) and also plutonic rocks ( underneath the volcanoes) What is the sea floor made up of: basault, formed in mid ocean, basault is an ocean sediment (her notes)
