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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Retrogradation</span></span>
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</style><div role="note" class="hatnote navigation-not-searchable">This article is about the geological term related to <a href="River_delta" title="River delta">river deltas</a>. For other uses, see <a href="Retrograde_(disambiguation)" class="mw-redirect mw-disambig" title="Retrograde (disambiguation)">Retrograde (disambiguation)</a>.</div>
<p><b>Retrogradation</b> is the landward change in position of the front of a <a href="River_delta" title="River delta">river delta</a> with time. This occurs when the <a href="Mass_balance" title="Mass balance">mass balance</a> of sediment into the delta is such that the <a href="Volume" title="Volume">volume</a> of incoming <a href="Sediment" title="Sediment">sediment</a> is less than the volume of the delta that is lost through <a href="Subsidence" title="Subsidence">subsidence</a>, <a href="Sea-level_rise" class="mw-redirect" title="Sea-level rise">sea-level rise</a>, and/or <a href="Erosion" title="Erosion">erosion</a>. As a result, retrogradation is most common:
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<ul><li>during periods of <a href="Sea-level_rise" class="mw-redirect" title="Sea-level rise">sea-level rise</a> which results in <a href="Marine_transgression" title="Marine transgression">marine transgression</a>. This can occur during major periods of <a href="Global_warming" class="mw-redirect" title="Global warming">global warming</a> and the melting of continental <a href="Ice_sheets" class="mw-redirect" title="Ice sheets">ice sheets</a>.</li>
<li>with extremely low sediment input.</li></ul>
<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="Progradation" title="Progradation">Progradation</a> – Growth of a river delta into the sea over time</li>
<li><a href="River_delta" title="River delta">River delta</a> – Silt deposition landform at the mouth of a river</li>
<li><a href="Aggradation" title="Aggradation">Aggradation</a> – Increase in land elevation due to the deposition of sediment</li>
<li><a href="Marine_transgression" title="Marine transgression">Marine transgression</a> – Geologic event in which sea level rises relative to the land</li>
<li><a href="Marine_regression" title="Marine regression">Marine regression</a> – Geologic event in which sea level falls relative to the land</li>
<li><a href="Sedimentology" title="Sedimentology">Sedimentology</a> – Study of natural sediments and their formation processes</li>
<li><a href="Stratigraphy" title="Stratigraphy">Stratigraphy</a> – Study of rock layers and their formation</li>
<li><a href="Sequence_stratigraphy" title="Sequence stratigraphy">Sequence stratigraphy</a> – Study and analysis of groups of sedimentary deposits</li>
<li><a href="Sediment_transport" title="Sediment transport">Sediment transport</a> – Movement of solid particles, typically by gravity and fluid entrainment</li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
<p><a rel="nofollow" class="external text" href="http://www.glossary.oilfield.slb.com/Display.cfm?Term=retrogradation">Schlumberger Oilfield Glossary</a>
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This article is issued from <a class="external text" title="Last edited on 2023-07-24" href="https://en.wikipedia.org/wiki/?title=Retrogradation&oldid=1166829193">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.
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