Magnetic properties of tektites and other related impact glasses

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

doi:10.1016/j.epsl.2015.10.030

Magnetic properties of tektites and other related impact glasses

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

Earth and Environmental Sciences-Twin Cities

Research output: Contribution to journal › Article › peer-review

20 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 language	English (US)
Pages (from-to)	381-390
Number of pages	10
Journal	Earth and Planetary Science Letters
Volume	432
DOIs	https://doi.org/10.1016/j.epsl.2015.10.030
State	Published - Dec 15 2015

Bibliographical note

Funding Information:
We deeply acknowledge the curators of London and Paris Natural History Museums, C. Smith and B. Zanda, for allowing us to measure on site their tektite and glass collections, as well as D.D. Badyukov (Vernadsky Institute, Moscow, Russia) and the private collectors, A. Carion, J. Cornec, L. Labenne, N. Lehrman and M. Warner, who helped in completing our database through gifts and loans. N. Lehrman deserves a special acknowledgment for coining the term “tektoid”. Editor and reviewers, B. Marty, G. Giuli and T. Kohout, are thanked for timely and constructive assessment of the submitted manuscript. This work was partially performed according to the Russian Government Program of Competitive Growth of Kazan Federal University. We acknowledge the support of INSU/CNES Planetology Program on the atacamaite study.

Publisher Copyright:
© 2015 Elsevier B.V.

Keywords

Crater
Impact glass
Magnetic properties
Tektite

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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title = "Magnetic properties of tektites and other related impact glasses",

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.",

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author = "P. Rochette and J. Gattacceca and B. Devouard and F. Moustard and Bezaeva, {N. S.} and C. Courn{\`e}de and B. Scaillet",

note = "Funding Information: We deeply acknowledge the curators of London and Paris Natural History Museums, C. Smith and B. Zanda, for allowing us to measure on site their tektite and glass collections, as well as D.D. Badyukov (Vernadsky Institute, Moscow, Russia) and the private collectors, A. Carion, J. Cornec, L. Labenne, N. Lehrman and M. Warner, who helped in completing our database through gifts and loans. N. Lehrman deserves a special acknowledgment for coining the term “tektoid”. Editor and reviewers, B. Marty, G. Giuli and T. Kohout, are thanked for timely and constructive assessment of the submitted manuscript. This work was partially performed according to the Russian Government Program of Competitive Growth of Kazan Federal University. We acknowledge the support of INSU/CNES Planetology Program on the atacamaite study. Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

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AU - Rochette, P.

AU - Gattacceca, J.

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AU - Moustard, F.

AU - Bezaeva, N. S.

AU - Cournède, C.

AU - Scaillet, B.

N1 - Funding Information: We deeply acknowledge the curators of London and Paris Natural History Museums, C. Smith and B. Zanda, for allowing us to measure on site their tektite and glass collections, as well as D.D. Badyukov (Vernadsky Institute, Moscow, Russia) and the private collectors, A. Carion, J. Cornec, L. Labenne, N. Lehrman and M. Warner, who helped in completing our database through gifts and loans. N. Lehrman deserves a special acknowledgment for coining the term “tektoid”. Editor and reviewers, B. Marty, G. Giuli and T. Kohout, are thanked for timely and constructive assessment of the submitted manuscript. This work was partially performed according to the Russian Government Program of Competitive Growth of Kazan Federal University. We acknowledge the support of INSU/CNES Planetology Program on the atacamaite study. Publisher Copyright: © 2015 Elsevier B.V.

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N2 - 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.

AB - 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.

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JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

ER -

Magnetic properties of tektites and other related impact glasses

Abstract

Bibliographical note

Keywords

UN SDGs

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