Abstract/Details

Modelling the cratering record of Venus


1998 1998

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Abstract (summary)

The images of the surface of Venus returned by the Magellan spacecraft show a cratering record unlike any other in the solar system. Multiple models of the geologic history of Venushave been proposed to explain this cratering record, including the “equilibrium resurfacing” model and the “global resurfacing” model.

I use a two-dimensional Monte Carlo simulation of crater emplacement and volcanic resurfacing to determine what sorts of cratering records would in fact be produced by these models. The equilibrium resurfacing model fails to produce a cratering record resembling the observations.

The global resurfacing model requires the specification of post-global resurfacing event history before it can be simulated by this program, but following appropriate specification, it did reproduce the observed cratering record. The global resurfacing model is thereby found to be a more satisfactory model than the equilibrium model.

The length of the tail end of the global resurfacing event is found to be of the order of 100 million years, subject to uncertainty in the impactor flux at Venus. The fraction of the planet resurfaced after the end of the global resurfacing event is found to be roughly 15–20%.

Indexing (details)


Subject
Astronomy;
Astrophysics;
Geology
Classification
0606: Astronomy
0606: Astrophysics
0372: Geology
Identifier / keyword
Pure sciences; Earth sciences; Cratering; Global resurfacing; Venus
Title
Modelling the cratering record of Venus
Author
Dawson, Douglas Duane
Number of pages
118
Publication year
1998
Degree date
1998
School code
0009
Source
DAI-B 59/11, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780599103856, 059910385X
Advisor
Strom, Robert G.
University/institution
The University of Arizona
University location
United States -- Arizona
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
9912086
ProQuest document ID
304413850
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304413850/fulltextPDF
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