Early fracturing and impact residue emplacement: Can modelling help to predict their location in major craters?
Article first published online: 26 JAN 2010
2004 The Meteoritical Society
Meteoritics & Planetary Science
Volume 39, Issue 2, pages 247–265, February 2004
How to Cite
Kearsley, A., Graham, G., McDonnell, T., Bland, P., Hough, R. and Helps, P. (2004), Early fracturing and impact residue emplacement: Can modelling help to predict their location in major craters?. Meteoritics & Planetary Science, 39: 247–265. doi: 10.1111/j.1945-5100.2004.tb00339.x
- Issue published online: 26 JAN 2010
- Article first published online: 26 JAN 2010
- Received: 30 June 2003; revision accepted: 15 December 2003
Abstract— Understanding the nature and composition of larger extraterrestrial bodies that may collide with the Earth is important. One source of information lies in the record of ancient impact craters, some of which have yielded chemical information as to the impacting body. Many deeply eroded craters have no remaining melt sheet or ejecta yet may contain impactor residue within basement fractures. The emplacement mechanism for fractionated siderophile residues is likely to be gaseous, although, melt droplets and some solid materials may survive. For breccia- and melt-filled fractures to contain extraterrestrial material, they must form very early in the impact process. Most current numerical models do not dwell on the formation and location of early major fractures, although, fractures in and around small craters on brittle glass exposed to hypervelocity impact in low Earth orbit have been successfully simulated. Modelling of fracture development associated with larger craters may help locate impact residues and test the models themselves.