11_SolidEarth

11_SolidEarth - "Solid Earth Global Tectonics(1 Jeff Dozier Tom Dunne Fall 2007 Read Summerfield chapters 3&4 in the Reader Message Environmental

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1 “Solid” Earth: Global Tectonics (1) Fall 2007 Read Summerfield Message Environmental problems arise in landscapes Range of sustainable manipulations of environments varies with landscape characteristics Landscape characteristics and functions depend on the tectonic* and climatic environment Awareness of these functions (processes) and patterns yields some predictive capacity, which is useful for environmental problem solving and management Need to understand the general characteristics and origin of the landscape you are working in, or the landscapes between which you are transferring information or experience. * “tectonic” means “Earth building” --- referring to the set of processes that deform Earth’s crust. Same root as “archi tec ture.” Global tectonics When we monitor very slow changes (mm/yr to cm/yr) in the positions of bedrock outcrops with GPS, we find that the rock material is moving across the planet’s surface.
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2 Rates of continental migration Global tectonics When we monitor very slow changes (mm/yr to cm/yr) in the positions of bedrock outcrops with GPS, we find that the rock material is moving across the planet’s surface. When we reconstruct the results of this behavior from spatial patterns of datable rocks that have evolved over millions of years, we find that these slow changes have involved very extensive features of Earth’s surface, such as large fractions of a continent or ocean floor, acting as units. Sea floor Ages http://www.ngdc.noaa.gov/mgg/image/crustageposter.jpg Global tectonics When we monitor very slow changes (mm/yr to cm/yr) in positions of bedrock outcrops with GPS, we find that the rock material is moving across the planet’s surface. When we reconstruct the results of this behavior from spatial patterns of datable rocks that have evolved over millions of years, we find that these slow changes have involved very extensive features of Earth’s surface, such as large fractions of a continent or ocean floor, acting as units. This mobile behavior of the “solid” Earth is described and explained by a theory called plate tectonics .
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3 You have a close personal relationship with Plate Tectonics The processes described by plate tectonics generate global patterns of geologic environments – Rock types – Crustal deformation – Biogeochemical mixing of lithosphere with other Earth System components You have a close personal relationship with Plate Tectonics • These geologic environments affect regional- scale patterns of (for example) – Habitability – Resources – Hazards • Awareness of these processes and patterns yields some predictive capacity, which is
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This note was uploaded on 08/06/2008 for the course ESM 203 taught by Professor Dozier,dunne during the Fall '07 term at UCSB.

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11_SolidEarth - "Solid Earth Global Tectonics(1 Jeff Dozier Tom Dunne Fall 2007 Read Summerfield chapters 3&4 in the Reader Message Environmental

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