Blue pools, desert varnish, alluvial fans, angular unconformity
Part 8 ALLUVIAL FANS and DELTAS. Classic alluvial fan. Fans often develop where confined channels on...
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Transcript of Part 8 ALLUVIAL FANS and DELTAS. Classic alluvial fan. Fans often develop where confined channels on...
![Page 1: Part 8 ALLUVIAL FANS and DELTAS. Classic alluvial fan. Fans often develop where confined channels on steep gradients suddenly emerge from their canyons,](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d4d5503460f94a2bed1/html5/thumbnails/1.jpg)
Part 8Part 8
ALLUVIAL FANS ALLUVIAL FANS and DELTASand DELTAS
![Page 2: Part 8 ALLUVIAL FANS and DELTAS. Classic alluvial fan. Fans often develop where confined channels on steep gradients suddenly emerge from their canyons,](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d4d5503460f94a2bed1/html5/thumbnails/2.jpg)
• Classic alluvial fan. Fans often develop where confined channels on steep gradients suddenly emerge from their canyons, changing the flow regimen sufficiently to stimulate deposition.
![Page 3: Part 8 ALLUVIAL FANS and DELTAS. Classic alluvial fan. Fans often develop where confined channels on steep gradients suddenly emerge from their canyons,](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d4d5503460f94a2bed1/html5/thumbnails/3.jpg)
• River deltas are commonly built off a series of anastomotic distributary channels, such as that shown at lower right
![Page 4: Part 8 ALLUVIAL FANS and DELTAS. Classic alluvial fan. Fans often develop where confined channels on steep gradients suddenly emerge from their canyons,](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d4d5503460f94a2bed1/html5/thumbnails/4.jpg)
• The Mississippi and Atchafalaya Rivers have deposited enormous deltas over the past 6000 years; Delta # 7 being the youngest and #1 the oldest.
![Page 5: Part 8 ALLUVIAL FANS and DELTAS. Classic alluvial fan. Fans often develop where confined channels on steep gradients suddenly emerge from their canyons,](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d4d5503460f94a2bed1/html5/thumbnails/5.jpg)
• Abandoned distributaries of the Mississippi and Atchafalaya Rivers. The Metairie Ridge distributary channel, separating lower and upper New Orleans, is shown in red
![Page 6: Part 8 ALLUVIAL FANS and DELTAS. Classic alluvial fan. Fans often develop where confined channels on steep gradients suddenly emerge from their canyons,](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d4d5503460f94a2bed1/html5/thumbnails/6.jpg)
• Until the construction of jetties in the late 1870s, sand bars closed off the mouth of the Mississippi River each year for as much as 3 months at a time following high flows.