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In geology, accretion is a process by which material is added to a tectonic plate at a subduction zone, frequently on the edge of existing continental landmasses. The added material may be sediment, volcanic arcs , seamounts , oceanic crust or other igneous features.
In astrophysics, accretion is the accumulation of particles into a massive object by gravitationally attracting more matter, typically gaseous matter, into an accretion disk. [ 1 ] [ 2 ] Most astronomical objects , such as galaxies , stars , and planets , are formed by accretion processes.
In finance, the term accretion refers to a positive change in value following a transaction; it is applied in several contexts. When trading in bonds , accretion is the capital gain expected when a bond is bought at a discount to its par value , [ 1 ] given that, it is expected to mature at par .
A classic example is the Coast Range ophiolite of California, which is one of the most extensive ophiolite terranes in North America. This oceanic crust likely formed during the middle Jurassic Period, roughly 170 million years ago, in an extensional regime within either a back-arc or a forearc basin.
In Barcelona, for example, the accretion of the coast was a natural process until the late Middle Ages, when harbor-building increased the rate of accretion. The port of Ephesus , one of the great cities of the Ionian Greeks in Asia Minor , was filled with sediment due to accretion from a nearby river; it is now 5 kilometers (3.1 mi) from the sea.
Accretion (coastal management), the process where coastal sediments return to the visible portion of the beach following storm erosion Accretion (geology) , the increase in size of a tectonic plate by addition of material along a convergent boundary
The captured material forms a gaseous accretion disc and spirals inwards to ultimately fall onto the neutron star as in the binary system Cen X-3. For still other types of X-ray pulsars, the companion star is a Be star that rotates very rapidly and apparently sheds a disk of gas around its equator. The orbits of the neutron star with these ...
In another example, the possible presence of hydrogen in Earth's outer core suggests that the accretion of Earth’s water [14] [27] [28] was not limited to the final stages of Earth's accretion [23] and that water may have been absorbed into core-forming metals through a hydrous magma ocean. [14] [29]