| 词条 | Danube fan |
| 释义 |
The Danube fan is a relict{{Clarify|date=August 2010}} sedimentary feature in the northwestern part of the bottom of the Black Sea. It crosses three of its four major physiographic provinces: basin slope, basin apron, and the Euxine abyssal plain) and splits the abyssal plain into two inequal parts.[1] The fan was deposited by the Danube (mostly), Dniester, Southern Bug, and Dnieper rivers. It extends from the shelf break zone an approximately 200m isobath[2] for about 150 km downslope and reaches the depth of about 2,200 m within the abyssal plain.[3] The fan is a relict from Pleistocene times when the sea level was lower, and at present, little fluvial sediment is being added to the fan; most of material is deposited in the river estuaries.[4] The Danube sediment supply is via the Danube Canyon (also called Viteaz Canyon).[3] References1. ^Chapter: "Bathymetry and Microtopography of Black Sea: Structure" of the 20th Memoir The Black Sea — Geology, Chemistry, and Biology of the American Association of Petroleum Geologists (1974) {{DEFAULTSORT:Danube Fan}}2. ^"Environmental Degradation of the Black Sea: Challenges and Remedies", editors Șükrü T. Beșiktepe, Ümit Ünlüata, Alexandru S. Bologa, 1999, {{ISBN|0792356764}} [https://books.google.com/books?id=7RqFM0eCVZgC&pg=PA40&lpg=PA40&dq=%22viteaz+canyon%22&source=bl&ots=Q5uchiFJh-&sig=BJzuXTUlF75ljAaaa_hSXxJZARk&hl=en&ei=c_RES4H6O4GyNtCtpfEB&sa=X&oi=book_result&ct=result&resnum=4&ved=0CA4Q6AEwAw#v=onepage&q=%22viteaz%20canyon%22&f=false p.40] 3. ^1 "Late Quaternary channel avulsions on the Danube deep-sea fan, Black Sea", Marine Geology, September 2001; 179(1-2) : 25-37 4. ^Ross, D. A., E. T. Degens, and J. MacIlvaine (1970) "Black Sea: recent sedimentary history", Science, vol. 170, no. 3954, p. 163-165 3 : Landforms of the Black Sea|Paleogeography|Danube |
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