What is eustatic cycle?
Stratigraphic cycles refer to the transgressive and regressive sequences bounded by unconformities in the stratagraphic record on the cratons. These cycles represent a large scale eustasy cycle since the Cambrian period with further sub-divisions of those units.
What two factors control eustatic sea?
In principle, global eustatic sea level can vary due to two ma- jor groups of processes, (1) changes in the volume of water within the ocean basins, or (2) changes of the net volume of the ocean basins itself (e.g. Conrad, 2013; “ocean container volume” of Haq, 2014).
What does Eustacy mean?
worldwide change of sea level
Definition of eustacy : worldwide change of sea level as contrasted with local diastrophic uplift or subsidence of the land.
Is land uplift not considered eustatic?
Land uplift or subsidence can result in, respectively, a fall or rise in sea level that cannot be considered eustatic as the volume or mass of water does not change.
How eustatic changes in sea level can occur?
An increase of the eustatic sea level can be generated by decreasing glaciation, increasing spreading rates of the mid-ocean ridges or more mid-oceanic ridges. Conversely, increasing glaciation, decreasing spreading rates or fewer mid-ocean ridges lead to a fall of the eustatic sea level.
What is Glacio eustatic?
glacioeustasy (glacioeustastism) The theory that sea levels rise and fall in response to the melting of ice during interglacials and the accumulation of ice during glaciations. A major glacioeustatic oscillation has an amplitude of some 100 m. See GLACI-. A Dictionary of Earth Sciences.
What is the difference between eustatic isostatic and tectonic sea level change?
Isostatic sea level change is the result of an increase or decrease in the height of the land. When the height of the land increases, the sea level falls and when the height of the land decreases the sea level rises. Isostatic change is a local sea level change whereas eustatic change is a global sea level change.