GEOLOGY 101 1st Edition Lecture 5 Outline of Last Lecture I. Plate Boundariesa. ConvergentII. Examples of earthly boundariesOutline of Current Lecture I. Plate Boundariesa. Transformb. Special Cases – Hot SpotsII. Oceanic and Continental LithosphereCurrent LectureTransform Boundaries:- Plates shifting past one another laterally, causing earthquakes. (Sheer Stress)- Volcanoes can be present (little crust is created and destroyed). - This boundary allows plates to slide past one another while moving at different velocities. (Strike-Slip Fault)o Fault: Fracture in the crust along which there has been movement.Hot Spots:- Stationary, surface expression of volcanic activity.- Result of a thermal mantle plume, a localized source of rising heat energy form the mantle-core (?) boundary.- So hot and intense that it will burn holes into the plate and erupt at the surface.* Plate Velocity can be determined by simply tracking the rate that a plate moves over astationary hot spot. How did the crust of the Earth form?- Divergent BoundariesThese 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.o Decompression melting: forming oceanic lithosphere.- Convergent Boundaries: (with subduction zones)o Flux-melting: Partial melting in a subduction zone. This forms new land through volcanism.o Land is attached to the continents by accretion.o Destruction occurs in the oceanic crust.- Convergent Boundaries: (without subduction zones)o Continents change shape during collisions by suturing landmasses together.o Accretion: the process of continental growth in which buoyant fragments (Accreted terrains) of crust are attached to continents during plate
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