111-pp15 - 1 GY 111: Physical Geology GY 111: Physical...

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Unformatted text preview: 1 GY 111: Physical Geology GY 111: Physical Geology UNIVERSITY OF SOUTH ALABAMA Lecture 15: Sedimentary Environments 1 Alluvial Fans, Rivers & Deltas Lecture 15: Sedimentary Environments 1 Alluvial Fans, Rivers & Deltas Last time we covered 1) Types of Sediment 2) Sedimentary Rock Classification 3) Sediment Transport Types of Sedimentary Rocks 1) siliciclastic 2) biochemical 3) chemical 4) organic Classification of Sediment and Sedimentary Rocks Siliciclastic Rock Name Classification of Sediment and Sedimentary Rocks Sedimentary Rocks Four distinct classes: 1) Siliciclastic 2) Biochemical 3) Chemical 4) Organic 2 Sediment Transport Bed load: sediment (sand and gravel) transported along the bed of a river Suspended load: sediment (clay and silt) transported within the water column of a river Solute load: dissolved minerals transported in a river Todays Agenda Web notes 15a: Alluvial Fans Web notes 15b: Rivers and Deltas: Lab Manual Chapter 3 1) Depositional Environments in general 2) Alluvial fans and their rocks 3) Meandering Rivers 4) Deltas Depositional Environments Depositional (or sedimentary) environments: Places where sediment is deposited (i.e., sediment sinks). Depositional Environments Depositional (or sedimentary) environments: Places where sediment is deposited (i.e., sediment sinks). They are numerous. Sedimentologists study sedimentary rocks to reconstruct past environments of deposition Depositional Environments Depositional (or sedimentary) environments: Places where sediment is deposited (i.e., sediment sinks). They are numerous. Sedimentologists study sedimentary rocks to reconstruct past environments of deposition Alluvial Fans Fan-shaped deposits of siliciclastic sediment deposited at the base of mountains 3 Alluvial Fans Fan-shaped deposits of siliciclastic sediment deposited at the base of mountains Gravel to clay sized Angular to sub rounded immature Alluvial Fans 1 km Alluvial Fans 1 km Alluvial Fans 1 km Alluvial Fans 1 km Alluvial Fans 1 km Fan head Fan head 4 Alluvial Fans 1 km Fan head Fan head mid fan mid fan Alluvial Fans 1 km Fan head Fan head mid fan mid fan Fan toe Fan toe Alluvial Fans 1 km Fan head Fan head mid fan mid fan Fan toe Fan toe Alluvial plain Alluvial Fans 1 km Alluvial Fans 1 km Alluvial Fans 1 km gradient 5 Alluvial Fans 1 km gradient wind Alluvial Fans 2 km Alluvial Fans 2 km Alluvial Fans 2 km Alluvial Fans 2 km Alluvial Fans 2 km 6 Alluvial Fans - view from the top Best developed in arid regions...
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111-pp15 - 1 GY 111: Physical Geology GY 111: Physical...

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