daire ºeklinde çevreleyen çit, engel, duvar, set

1 -Arcuate (rarely circular) dike with steep dip.
Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall

2 - A subcircular to circular dike with steep dip. Ring dikes may be many kilometers long, and hundreds or thousands of meters thick. Their radius is generally from 1 to 20 km. Although some ring dikes may form a nearly complete circle, more commonly they encompass 1/4 to 3/4 of a circle or ellipse. They are commonly associated with alkalic igneous complexes and carbonatites, so are probably related to deep shock effects or to cauldron subsidence. Ring dikes are commonly associated with cone sheets to form a ring complex. Syn: ring-fracture intrusion
Source: Dictionary of Mining, Mineral, and Related Terms

Kaynak: http://www.webref.org/geology/r/ring_dike.htm

slurry impoundment layouts = Havuza sulu çamur doldurmak

self-explanatory