World Library  
Flag as Inappropriate
Email this Article

Tolstoj (crater)

Article Id: WHEBN0014552961
Reproduction Date:

Title: Tolstoj (crater)  
Author: World Heritage Encyclopedia
Language: English
Subject: Tolstoj quadrangle, Leo Tolstoy, Impact crater, Titian (crater), Haydn (crater)
Collection: Impact Craters on Mercury, Leo Tolstoy
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Tolstoj (crater)

Tolstoj (crater)
Tolstoj is at the bottom to the right from the center.
Planet Mercury
Region Tolstoj quadrangle
Coordinates
Diameter 390 km
Eponym Leo Tolstoy[1]

Not to be confused with Alexey Tolstoy crater, a 95 km Mars crater named after Alexey Tolstoy.

Tolstoj is a large, ancient impact crater at latitude −15, longitude 165 on Mercury. It was named after Leo Tolstoy. The albedo feature Solitudo Maiae appears to be associated with this crater.[2]

The impact that produced the Tolstoj Basin occurred very early in the history of Mercury. Two ragged, discontinuous rings approximately 356 km and 510 km in diameter encompass the structure but are poorly developed on its north and northeast sides; a third partial ring with a diameter of 466 km occurs on its southeast side. Diffuse patches of material of dark albedo lie outside the innermost ring. The central part of the basin is covered by a high reflectance smooth plains (HRP) material.[3] The bright interior of the basin is noticeably redder than the surrounding plains, which are made of a bluer low reflectance material (LRM). The dark annulus of ejecta around Tolstoj is one of the darkest places on the surface of Mercury.[4]

The depth of Tolstoj is estimated to be 2.0 ± 0.7 km from the stereo derived digital elevation models based on Mariner 10 images of the planet. This is significantly less than the depth of lunar basins of the similar size indicating that Tolstoj probably has relaxed from its post impact shape.[3] The Tolstoj basin is used to define a time-stratigraphic system, the Tosltojan system, with the age of around 4.0–3.9 billion years. The older system (< 4.0 billion years) is called pre-Tosltojan, while the younger is called Calorian (3.9–3.5 billion years).[5]

Despite Tolstoj’s great age and its embayment by the ancient inter-crater plains, it retains an extensive and remarkably well preserved, radially lineated ejecta blanket around two-thirds of its circumference. The ejecta tends to be blocky and only weakly lineated between the inner and outer rings. Radial lineations with a slight swirly pattern are best seen on the southwest side of Tolstoj. The unusual rectilinear map pattern of the ejecta suggests: (1) control of the ejecta pattern by prebasin structures, (2) preferential burial along structural trends of an originally symmetrical ejecta blanket by the intercrater plains material, or (3) formation of Tolstoj by an oblique impact from the northwest that produced an ejecta blanket with bilateral symmetry and little or no deposition uprange. Analysis of stereophotography of Tolstoj ejecta northeast of the crater suggests that this deposit has been upwarped to a higher elevation relative to the surrounding plains.

References

  1. ^ "Mercury: Tolstoj". USGS. Retrieved December 5, 2009. 
  2. ^ Davies, M. E., Dwornik, S. E., Gault, D. E., and Strom, R. G., 1978, Atlas of Mercury: National Aeronautics and Space Administration Special Publication SP-423, 128 p.
  3. ^ a b Mohit, P. Surdas; Johnson, Catherine L.; Barnouin-Jha, Olivier; et al., Maria T.; Solomon, Sean C. (2009). "Shallow basins on Mercury: Evidence of relaxation?". Earth and Planetary Science Letters 285 (3-4): 355–363.  
  4. ^ Denevi, Brett W.; Robinson, Mark S.; Solomon, Sean C.; et al. (2009). "The Evolution of Mercury’s Crust: A Global Perspective from MESSENGER". Science 324: 613–18.  
  5. ^ Neukum, G.; Oberst, J.; Hoffmann, H.; et al. (2001). "Geologic evolution and cratering history of Mercury". Planetary and Space Science 49 (14-15): 1507–21.  

Further reading

  • Schaber, Gerald G.; John F. McCauley (1980). "Geologic Map Of The Tolstoj (H-8) Quadrangle Of Mercury".  Prepared for the National Aeronautics and Space Administration by U.S. Department of the Interior, U.S. Geological Survey. Published in hardcopy as USGS Miscellaneous Investigations Series Map I–1199, as part of the Atlas of Mercury, 1:5,000,000 Geologic Series. Hardcopy is available for sale from U.S. Geological Survey, Information Services, Box 25286, Federal Center, Denver, CO 80225)

External links

  • Tolstoj quadrangle maps
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.