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YANA RING STRUCTURE, NORTH-EASTERN SIBERIA: a FOSSIBLE COUNTERPART of ORONAE on VENUS G-A-Burba, Vernadsky Institute, Moscow, 117975, Liussia

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YANA RING STRUCTURE, NORTH-EASTERN SIBERIA: a FOSSIBLE COUNTERPART of ORONAE on VENUS G-A-Burba, Vernadsky Institute, Moscow, 117975, Liussia LPSC XXIV 2 17 YANA RING STRUCTURE, NORTH-EASTERN SIBERIA: A FOSSIBLE COUNTERPART OF ORONAE ON VENUS G-A-Burba, Vernadsky Institute, Moscow, 117975, liussia An arch of Verkhoyansky Range in NE Siberia, Russia, is considered here as W and S parts of the rim of the large ring structure, referred hereafter as Yana Ring Structure (YRS) after the name of Yana River, It have general appearance similar to coronae on Venus and could be considered as the terrestrial coun- terpat of coronae. The structure is located between 63 and ~oON, 125 and 140~~ (fig- 1). The outer diameter of YFS (between the rim feet) is 680-700 km. The rim crest diameter is 500-520 km. The inner dia- meter (between the inner feet of the rim) is 320-350 km. The rim of YRS consist of the following topographic features: W segment is Orulgan Range (N part of Verkhoyansky Range), SW and S seg- ments consist of S part of Verkhoyansky Range, SE segment is Elginskoye Ploskogorye (Tableland), E segment is Chersky Range (its part W of Indigirka River), NE segment is Selennyakhsky Range, and NW segment is Kular Range- Inside this ring of mountains Yanskoye Ploskogorye (Tableland) is located. The circular outlines of YRS are marked with the large river valleys located outside: Lena River (lower of Aldan River mouth) is located W from YRS, Aldan River (lower of Arnga River mouth) is from S, Indigirka River (between 64 and 67 O N.lat.1 is from E, and Selennyakh River (the part running N to S) is from NE. The ring patterns inside the mountaineous rim of YRS are marked with the tributaries of Yana River- The largest ring here, 300 km in diameter, consists of Bytangay (with Bellyakh) River at W, Nelgese and Derbeke Rivers at S/SE, and Tuostakh River at E'. The typical altitudes of YRS mountain rim are 1000-2000 m. The maximal ones are: 2400 m in W part of the rim, 2300 m in S, 1600 m in SE, 2200-2500 m in E, 1300-1500 m in N- The central part of YRS have typical altitudes of 400-600 m, There are low- lands with altitudes 50-200 m to the S, W, N, and NW outside YRS- Oymyakonskoye Nagorye (Highland) is located SE of YRS at 500-1500 m altitudes- It should be recognized from this description YRS have a general appearance of circular highland with its central plateau located 1000-2000 m lower than surrounding mountain rim, but 300- 400 m higher than plains of lowlands located outside the rim. Such topographic patterns are typical for coronae on Venus (1). The diameter of YRS is equal to the largest coronae on Venus. There are only 3 or 4 structures of such or larger size on the whole Venus. This calls to compare morphology and geologic evolu- tion of YRS with morphology and models of coronae evolution, especially the largest ones, to search the similarities and/or differences in geologic histories of the structures on the Earth and Venus. Reference: 1. G.A.Burba, V-P-Shashkina(1992)- Topographic comparison of coronae on Venus and Transylvanian ring structure on the Earth. In: Lunar and Planetary Science XXIII, pp. 183-184. O Lunar and Planetary Institute Provided by the NASA Astrophysics Data System 218 LPSC XXIV KANA RING STRfJCTrIRE IN SIEERIA. Burba, G.A. Fig. 1. Sketch map of Yana Ring Structure (YRS) - axis of mountain ranges; lineated segments of river valleys; / 200 and 1CKl0 m topographic contours; centre of the structure - O Lunar and Planetary Institute Provided by the NASA Astrophysics Data System .
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