1. n. [Geology] Global sea level variations. Changes in sea level can result from movement of tectonic plates altering the volume of ocean basins, or when changes in climate affect the volume of water stored in glaciers and in polar icecaps.

What is tectonic eustasy?

1. n. [Geology] Global sea level variations. Changes in sea level can result from movement of tectonic plates altering the volume of ocean basins, or when changes in climate affect the volume of water stored in glaciers and in polar icecaps.

What are eustatic cycles?

From Wikipedia, the free encyclopedia. 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 is the difference between Isostasy and eustasy?

Isostatic uplift is the process by which land rises out of the sea due to tectonic activity. It occurs when a great weight is removed from the land, e.g., the melting of an ice cap. Eustatic changes are the dropping of sea levels when eater is locked away as ice, and its rising as it melts.

What is the result of Isostasy?

For now, we can say that isostasy, like tectonic activity, is a process that emanates from the Earth’s interior, and as such, is capable of activating uplift and subsidence. Isostasy is the great equalizer. If weight is added to the Earth’s crust, the crust sinks. If weight is removed, the crust rises.

What is the difference between eustatic and relative sea level?

Relative sea level (abbreviated as RSL) is defined as the sea level that is observed with respect to a land-based reference frame. It is often contrasted with eustatic sea level, which is a measure of the total mass or volume of the oceans.

What is the difference between Isostasy and Eustasy when it comes to sea level change?

Isostatic sea-level changes occur at different rates on different coasts. Eustatic sea-level changes are caused by changes in the volume of ocean water or in the volume of the ocean basins that occur as a result of a variety of plate tectonic and climatic change processes.

Why does river rejuvenation occur?

If the land level rises or the sea level falls, there is a drop in the base level. This will result in the land rising when compared to the sea level. The new river profile will now flow faster to the sea as vertical erosion cuts into the river bed. This process is called rejuvenation.

Is isostasy a fact?

Isostasy represents in fact the relation between the crust and the upper mantle so that the Earth’s crust is in an equilibrium state.

Who discovered isostasy?

The general term ‘isostasy’ was coined in 1882 by the American geologist Clarence Dutton.

What causes Eustasy?

changes in sea level, called eustatic sea-level changes, have occurred throughout geologic history. The most common causes of such sea-level changes are global climatic fluctuations that lead to major glacial advances and retreats—that is, ice ages and interglacial periods.

What are the differences between Isostasy and Eustasy?

Eustatic change causes a global rise or fall in sea level. Isostatic sea level change occurs due to the movement of the land in relation to the sea in specific areas and hence causes a local change in sea level.

What is the difference between Eustasy and Isostasy?