91.%20Depositional%20Environments

91.%20Depositional%20Environments - Depositional...

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Depositional Depositional Environments Environments Lecture 9 Lecture 9 Depositional Environments Depositional Environments Lecture 9: Depositional Environments Page 1 of 18
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Talus/Alluvial Fan Talus/Alluvial Fan ± Localized deposit Localized deposit ± Highly irregular Highly irregular ± Poorly sorted Poorly sorted ± Close to source Close to source ± Base of cliff/mountain Base of cliff/mountain Lecture 9: Depositional Environments Page 2 of 18
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Talus Deposits Talus Deposits Landslide Base Braided Stream Braided Stream ± Steep gradient Steep gradient ± Coarse sediment Coarse sediment ± Gravel bars Gravel bars ± Constantly shifting Constantly shifting channel channel ± Flash Flood Flash Flood susceptible susceptible ± Clear water flow Clear water flow Lecture 9: Depositional Environments Page 3 of 18
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Braided Steam Lecture 9: Depositional Environments Page 4 of 18
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Meandering Stream Meandering Stream ± Moderate to low gradient Moderate to low gradient ± Mixed (Combined) load Mixed (Combined) load of suspended and bed of suspended and bed transported sediments transported sediments ± Muddy water Muddy water ± Single channel Single channel ± Grain Grain -size trend is size trend is fining fining upward upward Meandering River Abandoned Channel – Oxbow Lake Misfit Systems Lecture 9: Depositional Environments Page 5 of 18
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91.%20Depositional%20Environments - Depositional...

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