تقدم خط الشاطئ
تقدم خط الشاطئ Progradation، هو نمو في اتجاه البحر، نتيجة لتجمع الرواسب أو الصخور الرسوبية. وتتقدم الدلتا، كما تتقدم أيضا الشعاب العضوية، ويترتب على تقدم الشاطئ انحسار البحر.[1][2]
Progradation can be caused by:
- Periods of sea-level fall which result in marine regression. This can occur during major continental glaciations within ice ages,[3] be caused by changes in the rates of seafloor spreading that affects the volume of the ocean basins,[4] or tectonic effects on the regional mantle density structure that can change the geoid elevation.[5]
- Extremely high sediment input, such as by the Huang He (Yellow River) in China, which drains the Loess plateau,[6] or from high sediment loads in proglacial rivers.[7]
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انظر أيضا
- Retrogradation
- River delta
- Aggradation
- Marine transgression
- Marine regression
- علم الرسوبيات
- علم طبقات الأرض
- Sequence stratigraphy
- Sediment transport
المصادر
- ^ عبد الجليل هويدي، محمد أحمد هيكل (2004). أساسيات الجيولوجيا التاريخية. مكتبة الدار العربية للكتب.
- ^ Jackson, Julia A., ed. (1997). "progradation". Glossary of geology (Fourth ed.). Alexandria, Virginia: American Geological Institute. ISBN 0922152349.
- ^ 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. ISBN 0918985749. Retrieved 23 May 2022.
- ^ 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. 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. 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. S2CID 128823562.
