Formation and geomorphologic history of the Lonar impact crater deduced from in situ cosmogenic 10Be and 26Al

Atsunori Nakamura, Yusuke Yokoyama, Yasuhito Sekine, Kazuhisa Goto, Goro Komatsu, P. Senthil Kumar, Hiroyuki Matsuzaki, Ichiro Kaneoka, Takafumi Matsui

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The Lonar impact crater is one of a few craters on Earth formed directly in basalt, providing a unique opportunity to study an analog for crater degradation processes on Mars. Here we present surface 10Be and 26Al exposure dates in order to determine the age and geomorphic evolution of Lonar crater. Together with a 14C age of preimpact soil, we obtain a crater age of 37.5 ± 5.0 ka, which contrasts with a recently reported and apparently older 40Ar/39Ar age (570 ± 47 ka). This suggests that the 40Ar/39Ar age may have been affected by inherited radiogenic 40Ar (40Arinherited) in the impact glass. The spatial distribution of surface exposure ages of Lonar crater differs from that for Barringer crater, indicating Lonar crater rim is actively eroding. Our new chronology provides a unique opportunity to compare the geomorphological history of the two craters, which have similar ages and diameters, but are located in different climate and geologic settings.

Original languageEnglish
Pages (from-to)3190-3197
Number of pages8
JournalGeochemistry, Geophysics, Geosystems
Volume15
Issue number8
DOIs
Publication statusPublished - 2014 Aug 1

Keywords

  • <sup>10</sup>Be and <sup>26</sup>Al
  • Lonar crater
  • Mars
  • exposure dating
  • impact crater
  • in situ cosmogenic nuclides

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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