Peak ring (crater)

Barton crater, a peak-ring (pinky ring) crater on Venus

A peak ring crater is a type of complex crater. A central peak is not seen, instead, a roughly circular peak (possibly discontinuous) surrounds the crater's center.

Formation

The rings form by different processes, and inner rings may not be formed by the same processes as outer rings. [1]

Peak rings have long been viewed to form in the stage subsequent to central peak formation in craters. The central peaks of craters are believed to originate from hydrodynamic flow of material lifted by inward-collapsing crater walls, while impact-shattered rock debris is briefly turned to fluid by strong vibrations that develop during crater formation. The peak-ring structure of Chicxulub crater was probably formed as inward-collapsing material impacted the over-steepened central peak, to form a hydraulic jump at the location where the peak ring was located.[2]

Other theories have been formulated. Perhaps, in the case of Chicxulub crater, an over-high central peak collapsed into the peak ring.[3]

Chicxulub is Earth's only crater to have an intact peak ring structure.[4]

Eminescu crater, a peak-ring crater on Mercury

More ideas are available.[4]

See also

References

  1. ↑ Geology Page: www.geologypage.com/2016/10/research-helps-explain-formation-ringed-crater-moon.html, accessdate: February 5, 2017
  2. ↑ H. J. Melosh (2015). "Peak-ring Craters and Multiring Basins" (PDF). Retrieved 18 Nov 2016.
  3. ↑ H. J. Melosh. "Drilling into Chicxulub's formation". Retrieved 18 Nov 2016.
  4. 1 2 Thomas Sumner (Nov 17, 2016). "How a ring of mountains forms inside a crater". Retrieved 18 Nov 2016.
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