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Investigating impact demagnetization through laser impacts and SQUID microscopy

Jerome Gattacceca, Michel Boustie, Benjamin P. Weiss, Pierre Rochette, Eduardo A. Lima, Luis E. Fong and Franz J. Baudenbacher
Investigating impact demagnetization through laser impacts and SQUID microscopy
Geology (Boulder) (May 2006) 34 (5): 333-336


Understanding demagnetization by hypervelocity impacts is crucial for the interpretation of planetary magnetic anomalies and remanent magnetization in meteorites. We describe an innovative approach for investigating the effects of impacts on the remanent magnetization of geologic materials. It consists of the combination of pulsed laser impacts and Superconducting Quantum Interference Device (SQUID) microscopy. Laser impacts are nondestructive, create shocks with peak pressures as high as several hundred GPa, and allow well-calibrated modeling of shock wave propagation within the impacted samples. High-resolution SQUID microscopy quantitatively maps the magnetic field of room-temperature samples with an unprecedented spatial resolution of approximately 100 mu m. We present shock modeling and magnetic field data obtained for two laser impacts on a magnetite-bearing basalt sample. Magnetic measurements show a demagnetized area at the impact locations. We also show that high-resolution magnetic measurements combined with impact modeling provide a continuous relation between the demagnetization intensity and the peak pressure undergone by the sample. This promising technique will allow for the investigation of the demagnetization behavior of a variety of geological materials upon impacts, with implications for our understanding of the magnetization of extraterrestrial materials and of terrestrial impact structures.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 34
Serial Issue: 5
Title: Investigating impact demagnetization through laser impacts and SQUID microscopy
Affiliation: CEREGE, CNRS/Universite Aix-Marseille III, France
Pages: 333-336
Published: 200605
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 37
Accession Number: 2006-049727
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2006069
Illustration Description: illus.
Secondary Affiliation: CNRS/ENSMA, FRA, FranceMassachusetts Institute of Technology, USA, United StatesVanderbilt University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200627
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