Chapter 13 Deltas Flashcards
What is the basis of delta classification?
Dominant grain size and energy process (river, wave, tide)
What is a delta top made of
distributary channels and overbank deposits
What are the features of a delta front?
subaqueous mouth bar, delta slope, and prodelta
what does it mean for a delta to prograde?
deposition result in the sediment body building out into the lake or sea
Features to identify delta deposits
coarsening and shallowing up pattern
T or F, it is important to find evidence of a river supplying sediments from land to formally interpret a delta deposit
True
Parts of the coarse grained delta prograde as it moves further out
Bed load river, gravelly proximal mouth bar, sandy distal mouth bar, sandy delta front, muddy prodelta
Difference between a shallow water and a deep water delta?
Shallow water prograde will spread while deep water prograde will remain restricted near the river mouth
How to identify a river dom delta
Low energy and interdistributary beds
how to id wave dom deltas
Beachline splits and mouth bars long and parallel to the shore
how to id tide dom deltas
Reworking of the delta front cause Lobes look like more deltas off shore
What is convolute bedding?
type of deformation that occurs when sedimentary layers crumble and fold
