Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Microstructures in Shocked Quartz: Linking Nuclear Airbursts and Meteorite Impacts

Version 1 : Received: 23 May 2023 / Approved: 25 May 2023 / Online: 25 May 2023 (03:47:36 CEST)

How to cite: Hermes, R.E.; Wenk, H.; Kennett, J.P.; Bunch, T.E.; Moore, C.R.; LeCompte, M.A.; Kletetschka, G.; Adedeji, A.V.; Langworthy, K.; Razink, J.J.; Brogden, V.; Van Devener, B.; Perez, J.P.; Polson, R.; Nowell, M.; West, A. Microstructures in Shocked Quartz: Linking Nuclear Airbursts and Meteorite Impacts. Preprints 2023, 2023051728. https://doi.org/10.20944/preprints202305.1728.v1 Hermes, R.E.; Wenk, H.; Kennett, J.P.; Bunch, T.E.; Moore, C.R.; LeCompte, M.A.; Kletetschka, G.; Adedeji, A.V.; Langworthy, K.; Razink, J.J.; Brogden, V.; Van Devener, B.; Perez, J.P.; Polson, R.; Nowell, M.; West, A. Microstructures in Shocked Quartz: Linking Nuclear Airbursts and Meteorite Impacts. Preprints 2023, 2023051728. https://doi.org/10.20944/preprints202305.1728.v1

Abstract

Many studies of hypervelocity impact craters have described the characteristics of quartz grains shock-metamorphosed at high pressures of >10 GPa, but in contrast, few studies have investigated shock metamorphism at lower shock pressures. In this study, we test the hypothesis that low-pressure shock metamorphism occurs in near-surface nuclear airbursts and that this process shares important characteristics with impact-cratering events. To investigate low-grade shock microstructures, we compared quartz grains from Meteor Crater, a 1.2-km-wide impact crater, to those from near-surface nuclear airbursts at the Alamogordo Bombing Range, New Mexico in 1945 and Kazakhstan in 1949/1953. This investigation utilized a comprehensive analytical suite of high-resolution techniques, including transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD). Meteor Crater and the nuclear test sites all exhibit metamorphosed quartz grains with closely-spaced, sub-micron-wide fractures that appear to have formed at low shock pressures. Importantly, these micro-fractures are closely associated with Dauphiné twins and are filled with amorphous silica (glass), widely considered to be a classic indicator of shock metamorphism. Thus, this study confirms that glass-filled shock fractures in quartz form during near-surface nuclear airbursts, as well as crater-forming impact events, and by extension, it suggests they also may form in near-surface cosmic airbursts.

Keywords

nuclear/atomic detonations; impact craters; shocked quartz; shock fractures; planar deformation features; planar fractures; tectonic deformation lamellae; electron backscatter diffraction (EBSD); transmission electron microscopy (TEM); cathodoluminescence (CL)

Subject

Environmental and Earth Sciences, Space and Planetary Science

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