Progradation
Insedimentary geologyandgeomorphology,the termprogradationrefers to the growth of ariver deltafarther out into the sea over time. This occurs when thevolumeof incomingsedimentis greater than the volume of the delta that is lost throughsubsidence,sea-level rise,orerosion.[1]
Progradation can be caused by:
- Periods ofsea-levelfall which result inmarine regression.This can occur during majorcontinental glaciationswithinice ages,[2]be caused by changes in the rates ofseafloor spreadingthat affects the volume of the ocean basins,[3]or tectonic effects on the regional mantle density structure that can change thegeoidelevation.[4]
- Extremely high sediment input, such as by the Huang He (Yellow River) inChina,which drains theLoess plateau,[5]or from high sediment loads inproglacial rivers.[6]
See also[edit]
- Retrogradation– Movement of the front of a river delta inland over time
- Aggradation– Increase in land elevation due to the deposition of sediment
- Marine transgression– Geologic event in which sea level rises relative to the land
- Sedimentology– Study of natural sediments and their formation processes
- Stratigraphy– Study of rock layers and their formation
- Sequence stratigraphy– Study and analysis of groups of sedimentary deposits
- Sediment transport– Movement of solid particles, typically by gravity and fluid entrainment
References[edit]
- ^Jackson, Julia A., ed. (1997). "progradation".Glossary of geology(Fourth ed.). Alexandria, Virginia: American Geological Institute.ISBN0922152349.
- ^Schofield, J. C. (March 1975). "Sea-level fluctuations cause periodic, post-glacial progradation, South Kaipara Barrier, North Island, New Zealand".New Zealand Journal of Geology and Geophysics.18(2): 295–316.doi:10.1080/00288306.1975.10418201.
- ^Embry, Ashton F. (1988). "Triassic sea-level changes: Evidence from the Canadian Arctic Archipelago".Sea-level changes: an integrated approach.Tulsa, Okla.: Society of Economic Paleontologists and Mineralogists.ISBN0918985749.Retrieved23 May2022.
- ^Stoker, Martyn S.; Holford, Simon P.; Hillis, Richard R.; Green, Paul F.; Duddy, Ian R. (July 2010)."Cenozoic post-rift sedimentation off northwest Britain: Recording the detritus of episodic uplift on a passive continental margin"(PDF).Geology.38(7): 595–598.Bibcode:2010Geo....38..595S.doi:10.1130/G30881.1.
- ^Saito, Yoshiki; Wei, Helong; Zhou, Yongqing; Nishimura, Akira; Sato, Yoshio; Yokota, Setsuya (August 2000). "Delta progradation and chenier formation in the Huanghe (Yellow River) delta, China".Journal of Asian Earth Sciences.18(4): 489–497.Bibcode:2000JAESc..18..489S.doi:10.1016/S1367-9120(99)00080-2.
- ^Nemec, W.; LφNNE, Ida; Blikra, Lars H. (16 January 2008). "The Kregnes moraine in Gauldalen, west-central Norway: anatomy of a Younger Dryas proglacial delta in a palaeofjord basin*".Boreas.28(4): 454–476.doi:10.1111/j.1502-3885.1999.tb00234.x.S2CID128823562.
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