slide 2 geo - Hypothesis initially proposed by Wilson(1963...

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1/24/2008 1 Geology of Yellowstone National Park Themes in Geology (Geol 1400, Section 1) Lecture 2 Earth’s internal structure ± Layers defined by composition ² Crust ² Mantle ² Outer core and inner core ± Layers defined by physical properties ² Lithosphere ² Asthenosphere ² Lower Mantle (Mesosphere) ² Outer core and inner core Earth layers: physical properties ± Lithosphere (“sphere of rock”) ± Plate tectonics Lithospheric plates
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1/24/2008 2 Earth layers: physical properties ± Asthenosphere (“weak sphere”) Beneath the lithosphere, within the upper mantle to ~ 670 km depth Plate Tectonics ± The central concepts… Earth’s outer shell is broken into rigid plates ² Lithospheric plates All plates move continuously relative to one another Plates interact along their boundaries Plates move over the asthenosphere Three types of plate boundaries Based on the relative motion of the plates divergent plate boundaries convergent plate boundaries transform plate boundaries
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1/24/2008 3 Mantle plumes and hotspots
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Unformatted text preview: Hypothesis initially proposed by Wilson (1963) and Morgan (1971) Mantle plumes and hotspots See Fig. 2.2 Mantle plumes and “hotspot tracks” See Fig. 2.2 1/24/2008 4 Rock-A coherent, naturally occurring solid, consisting of an aggregate of minerals +/- glass Three major rock types ± Igneous rocks : ± Sedimentary rocks : ± Metamorphic rocks : The rock cycle is a mass transfer cycle Rock types distributed at the surface USGS - North American Tapestry of Time and Terrain 1/24/2008 5 Geologic time Yellowstone Geologic Map Fig. 3.10 Yellowstone Geology (pre-hotspot) ± Approximately 2.7 Ga (billion years) ago 1/24/2008 6 Yellowstone Geology (pre-hotspot) ± 570-75 Ma (million years) ago Yellowstone Geology (pre-hotspot) ± 75-55 Ma ago Yellowstone Geology (pre-hotspot) ± 50 Ma ago 1/24/2008 7 Yellowstone Geology (pre-hotspot) ± 40-10 Ma ago Yellowstone Geology (hotspot) ± 3-2 Ma ago...
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slide 2 geo - Hypothesis initially proposed by Wilson(1963...

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