How mountains are made. We will talk about valleys (erosion and weathering later)
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1 How mountains are made We will talk about valleys (erosion and weathering later)
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3 Continent-continent plate convergence Less dense, granite-type materials resist subduction Colliding plates pile up, producing a deformed and thicker crust of lighter materials Example: Tibetan Plateau and Himalayan Mountains
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5 The Himalayas
6 Glacier National Park
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8 Chief Mountain
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10 Principle of Superposition Youngest Strata Oldest Strata
11 Volcanic Eruptions Lava is produced when magma reaches Earth s surface Explosive eruptions can produce rapidly cooled rock fragments called pyroclasts Size range from dust (ash) to boulders (blocks and volcanic bombs) Calm oozing of magma out of the ground produces lava flows Pyroclastics and lava flows form extrusive igneous rocks Lava flows and pyroclasts pile up to form volcanoes
12 Mt Fuji: Stratovolcano
13 Elkhorn Mountains
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15 Where do we see deep earthquakes? What is happening there?
16 Ocean-continent plate convergence Oceanic plate of denser basaltic material subducted under less dense granite-type continental shelf Marked by oceanic trench, deep-seated earthquakes and volcanic mountains Example: convergence of South American Plate with Nazca Plate
17 The Sierra Nevada Mountains Half Dome
18 The Sierra Nevada Mountains
19 The Boulder Batholith outside of Butte
20 The Boulder Batholith outside of Butte
21 Geologic Structures Geologic structures are dynamically-produced patterns or arrangements of rock or sediment that result from, and give information about, forces within the Earth Produced as rocks change shape and orientation in response to applied stress Structural geology is the study of the shapes, arrangement, and interrelationships of rock units and the forces that cause them
22 Orientation of Geologic Structures Geologic structures are most obvious in deformed sedimentary rocks Tilted beds, joints, and faults are planar features whose orientation is described by their strike and dip Strike is the compass direction of a line formed by the intersection of an inclined plane with a horizontal plane Dip is the direction and angle from horizontal in which a plane is oriented
23 Figure 15.6
24 Figure 15.7
25 What do rocks do when you stress on them? The either bend (fold) or break (fracture and/or fault)
26 Stress and Strain Stress is force per unit area The three basic types of stress are compressive, tensional and shear Strain is a change in size or shape in response to stress Geologic structures are indicative of the type of stress and its rate of application, as well the physical properties of the rocks or sediments
27 Figure 15.2
28 Geologic Structures: Folds Folds are wavelike bends in layered rock Represent rock strained in a ductile manner, usually under compression The axial plane divides a fold into its two limbs The surface trace of an axial plane is called the hinge line (or axis) of the fold Anticlines are upward-arching folds, and synclines are downward-arching folds
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31 Types of Folds Plunging folds are folds in which the hinge line is not horizontal Where surfaces have been leveled by erosion, plunging folds form V- or horseshoe-shaped patterns of exposed rock layers (beds) Open folds have limbs that dip gently, whereas isoclinal folds have parallel limbs Overturned folds have limbs that dip in the same directions, and recumbent folds are overturned to the point of being horizontal
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33 Folds.exe
34 Structural Domes and Basins Domes are structures in which the beds dip away from a central point Sometimes called doubly plunging anticlines Basins are structures in which the beds dip toward a central point Sometimes called doubly plunging synclines
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37 Figure 15.19
38 Fractures in Rock Joints - fractures bedrock along which no movement has occurred Multiple parallel joints are called joint sets Faults - fractures in bedrock along which movement has occurred Considered active if movement has occurred along them within the last 11,000 years Categorized by type of movement as dip-slip, strike-slip, or oblique-slip
39 Types of Faults Normal faults have movement parallel to the dip of the fault plane In normal faults, the hanging-wall block has moved down relative to the footwall block In reverse faults, the hanging-wall block has moved up relative to the footwall block Insert revised Fig here Insert revised Fig a here
40 Normal and Reverse Faults
41 Types of Faults Dip-slip (normal) faults have movement parallel to the dip of the fault plane Fault blocks, bounded by normal faults, that drop down or are uplifted are known as grabens and horsts, respectively Grabens associated with divergent plate boundaries are called rifts Thrust faults are reverse faults with dip angles less than 30 from horizontal
42 The Tetons
43 The Tetons
44 The Beartooths
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46 Basin and Range
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48 Basin and Range
49 Basin and Range
50 Types of Faults Strike-slip faults have movement that is predominantly horizontal and parallel to the strike of the fault plane A viewer looking across to the other side of a right-lateral strike-slip fault would observe it to be offset to their right A viewer looking across to the other side of a left-lateral strike-slip fault would observe it to be offset to their left Oblique-slip faults have movement with both vertical and horizontal components Right-lateral San Andreas Fault
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52 Juan de Fuca plate
53 San Andreas Fault
54 San Andreas Fault
55 Figure Faulitng.exe
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