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Carl Alwmark

Carl Alwmark

Universitetslektor

Carl Alwmark

First known Terrestrial Impact of a Binary Asteroid from a Main Belt Breakup Event

Författare

  • Jens Ormoe
  • Erik Sturkell
  • Carl Alwmark
  • Jay Melosh

Summary, in English

Approximately 470 million years ago one of the largest cosmic catastrophes occurred in our solar system since the accretion of the planets. A 200-km large asteroid was disrupted by a collision in the Main Asteroid Belt, which spawned fragments into Earth crossing orbits. This had tremendous consequences for the meteorite production and cratering rate during several millions of years following the event. The 7.5-km wide Lockne crater, central Sweden, is known to be a member of this family. We here provide evidence that Lockne and its nearby companion, the 0.7-km diameter, contemporaneous, Malingen crater, formed by the impact of a binary, presumably 'rubble pile' asteroid. This newly discovered crater doublet provides a unique reference for impacts by combined, and poorly consolidated projectiles, as well as for the development of binary asteroids.

Avdelning/ar

  • Berggrundsgeologi

Publiceringsår

2014

Språk

Engelska

Publikation/Tidskrift/Serie

Scientific Reports

Volym

4

Dokumenttyp

Artikel i tidskrift

Förlag

Nature Publishing Group

Ämne

  • Geology

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 2045-2322