Apsheron Sill
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The Apsheron Sill, Absheron Sill, Apsheron Ridge or Apsheron Threshold is a major northwest-southeast-trending
bathymetric Bathymetry (; ) is the study of underwater depth of ocean floors ('' seabed topography''), river floors, or lake floors. In other words, bathymetry is the underwater equivalent to hypsometry or topography. The first recorded evidence of water ...
high that runs for about across the whole of the
Caspian Sea The Caspian Sea is the world's largest inland body of water, described as the List of lakes by area, world's largest lake and usually referred to as a full-fledged sea. An endorheic basin, it lies between Europe and Asia: east of the Caucasus, ...
from
Baku Baku (, ; ) is the Capital city, capital and List of cities in Azerbaijan, largest city of Azerbaijan, as well as the largest city on the Caspian Sea and in the Caucasus region. Baku is below sea level, which makes it the List of capital ci ...
in
Azerbaijan Azerbaijan, officially the Republic of Azerbaijan, is a Boundaries between the continents, transcontinental and landlocked country at the boundary of West Asia and Eastern Europe. It is a part of the South Caucasus region and is bounded by ...
to the
Cheleken Peninsula The Cheleken Peninsula () is a peninsula located in western Turkmenistan, in the eastern shores of the Caspian Sea. The city of Hazar, former Cheleken, is located in the peninsula, which administratively belongs to Turkmenistan's Balkan Province ...
in
Turkmenistan Turkmenistan is a landlocked country in Central Asia bordered by Kazakhstan to the northwest, Uzbekistan to the north, east and northeast, Afghanistan to the southeast, Iran to the south and southwest and the Caspian Sea to the west. Ash ...
. The sill separates the central and southern parts of the Caspian Sea. It is interpreted to be the surface expression of a northeast- dipping
subduction zone Subduction is a geological process in which the oceanic lithosphere and some continental lithosphere is recycled into the Earth's mantle at the convergent boundaries between tectonic plates. Where one tectonic plate converges with a second p ...
along which
oceanic crust Oceanic crust is the uppermost layer of the oceanic portion of the tectonic plates. It is composed of the upper oceanic crust, with pillow lavas and a dike complex, and the lower oceanic crust, composed of troctolite, gabbro and ultramaf ...
of the South Caspian Basin is being subducted beneath the Central Caspian as part of the complex zone of
continental collision In geology, continental collision is a phenomenon of plate tectonics that occurs at Convergent boundary, convergent boundaries. Continental collision is a variation on the fundamental process of subduction, whereby the subduction zone is destroy ...
between the Arabian Plate and the Eurasian Plate.


References

{{Reflist Caspian Sea Geology of Azerbaijan Geology of Turkmenistan