GEOL 102 1st Edition Lecture 16Outline of Last Lecture I. Ocean-continent covergent plate boundaryII. Explosive volcanism III. Composite coneOutline of Current Lecture I. Ocean-ocean convergent plate boundaryII. Non-explosive volcanismIII. Volcanic island chainCurrent LectureI. Ocean-ocean convergent plate boundarya. Subductioni. Same material colliding, but one will be older and colder (the one that is going down)b. Earth quake depth can be shallow, intermediate, and/ or deepi. The shallower, the more powerfulii. The deeper, the weakerII. Non explosive volcanism a. Oceanic lithosphere is Low in Si i. Gases can escape and not build upIII. Volcanic island chaina. All volcanoes can be active or sleeping with the potential to erupt IV. Geology of the North Shore of Lake Superior a. Black, fine-grained, igneous rock = basalti. Why would there be basalt here? b. North shorei. 1.1 billion years ago (Precambrian era)ii. Had nonexposive volcanismiii. Continent- continent divergent plate boundary1. Caused mid continental rifThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.a. Bleeds basalt and forms oceansiv. In the MCR the melting in the upper part of the asthenosphere1. Forms low Si melt2. Moves slowly, melts continental lithosphere on way up 3. Si will increase viscositya. Explosive
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