Experimental shock metamorphism of terrestrial basalts: Agglutinate-like particle formation, petrology, and magnetism

Dmitrii D. Badyukov, Natalia S. Bezaeva, Pierre Rochette, Jérôme Gattacceca, Joshua M Feinberg, Myriam Kars, Ramon Egli, Jouko Raitala, Dilyara M. Kuzina

Research output: Contribution to journalArticle

Abstract

Hypervelocity impacts occur on bodies throughout our solar system, and play an important role in altering the mineralogy, texture, and magnetic properties in target rocks at nanometer to planetary scales. Here we present the results of hypervelocity impact experiments conducted using a two-stage light-gas gun with 5 mm spherical copper projectiles accelerated toward basalt targets with ~6 km s−1 impact velocities. Four different types of magnetite- and titanomagnetite-bearing basalts were used as targets for seven independent experiments. These laboratory impacts resulted in the formation of agglutinate-like particles similar in texture to lunar agglutinates, which are an important fraction of lunar soil. Materials recovered from the impacts were examined using a suite of complementary techniques, including optical and scanning electron microscopy, micro-Raman spectroscopy, and high- and low-temperature magnetometry, to investigate the texture, chemistry, and magnetic properties of newly formed agglutinate-like particles and were compared to unshocked basaltic parent materials. The use of Cu-projectiles, rather than Fe- and Ni-projectiles, avoids magnetic contamination in the final shock products and enables a clearer view of the magnetic properties of impact-generated agglutinates. Agglutinate-like particles show shock features, such as melting and planar deformation features, and demonstrate shock-induced magnetic hardening (two- to seven-fold increases in the coercivity of remanence Bcr compared to the initial target materials) and decreases in low-field magnetic susceptibility and saturation magnetization.

Original languageEnglish (US)
Pages (from-to)131-150
Number of pages20
JournalMeteoritics and Planetary Science
Volume53
Issue number1
DOIs
StatePublished - Jan 1 2018

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shock metamorphism
petrology
magnetic property
basalt
texture
shock
hypervelocity impact
projectiles
textures
magnetic properties
lunar soil
titanomagnetite
Raman spectroscopy
light gas guns
parent material
magnetic susceptibility
hardening
magnetization
solar system
impact velocity

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Experimental shock metamorphism of terrestrial basalts : Agglutinate-like particle formation, petrology, and magnetism. / Badyukov, Dmitrii D.; Bezaeva, Natalia S.; Rochette, Pierre; Gattacceca, Jérôme; Feinberg, Joshua M; Kars, Myriam; Egli, Ramon; Raitala, Jouko; Kuzina, Dilyara M.

In: Meteoritics and Planetary Science, Vol. 53, No. 1, 01.01.2018, p. 131-150.

Research output: Contribution to journalArticle

Badyukov, DD, Bezaeva, NS, Rochette, P, Gattacceca, J, Feinberg, JM, Kars, M, Egli, R, Raitala, J & Kuzina, DM 2018, 'Experimental shock metamorphism of terrestrial basalts: Agglutinate-like particle formation, petrology, and magnetism', Meteoritics and Planetary Science, vol. 53, no. 1, pp. 131-150. https://doi.org/10.1111/maps.13006
Badyukov, Dmitrii D. ; Bezaeva, Natalia S. ; Rochette, Pierre ; Gattacceca, Jérôme ; Feinberg, Joshua M ; Kars, Myriam ; Egli, Ramon ; Raitala, Jouko ; Kuzina, Dilyara M. / Experimental shock metamorphism of terrestrial basalts : Agglutinate-like particle formation, petrology, and magnetism. In: Meteoritics and Planetary Science. 2018 ; Vol. 53, No. 1. pp. 131-150.
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