Magnetic properties of tektites and other related impact glasses

P. Rochette, J. Gattacceca, B. Devouard, F. Moustard, N. S. Bezaeva, C. Cournède, B. Scaillet

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

We present a comprehensive overview of the magnetic properties of the four known tektite fields and related fully melted impact glasses (Aouelloul, Belize, Darwin, Libyan desert and Wabar glasses, irghizites, and atacamaites), namely magnetic susceptibility and hysteresis properties as well as properties dependent on magnetic grain-size. Tektites appear to be characterized by pure Fe2+ paramagnetism, with ferromagnetic traces below 1 ppm. The different tektite fields yield mostly non-overlapping narrow susceptibility ranges. Belize and Darwin glasses share similar characteristics. On the other hand the other studied glasses have wider susceptibility ranges, with median close to paramagnetism (Fe2+ and Fe3+) but with a high-susceptibility population bearing variable amounts of magnetite. This signs a fundamental difference between tektites (plus Belize and Darwin glasses) and other studied glasses in terms of oxygen fugacity and heterogeneity during formation, thus bringing new light to the formation processes of these materials. It also appears that selecting the most magnetic glass samples allows to find impactor-rich material, opening new perspectives to identify the type of impactor responsible for the glass generation.

Original languageEnglish (US)
Pages (from-to)381-390
Number of pages10
JournalEarth and Planetary Science Letters
Volume432
DOIs
StatePublished - Dec 15 2015

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V.

Keywords

  • Crater
  • Impact glass
  • Magnetic properties
  • Tektite

Fingerprint

Dive into the research topics of 'Magnetic properties of tektites and other related impact glasses'. Together they form a unique fingerprint.

Cite this