The effects of explosive-driven shocks on the natural remanent magnetization and the magnetic properties of rocks

Gattacceca, J.; Lamali, A.; Rochette, P.; Boustie, M.; Berthe, Laurent

doi:10.1016/j.pepi.2007.03.006

Cited by 68 publications

(108 citation statements)

References 17 publications

(2 reference statements)

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“…Gattacceca et al (2007) observed similar changes in AMS for basalt and microdiorite shocked to pressure greater than 10 GPa.…”

Section: Summary and Discussionsupporting

confidence: 56%

“…Such stress-induced anisotropy has been suggested to be removable by tumbling AF demagnetization (Park et al, 1988). In contrast, the AMS changes recorded at intermediate to high shock pressures may be related to either the fracturing of magnetic grains (Gattacceca et al, 2007) or the formation of lattice defects, such as dislocations. Both mechanisms are consistent with the high stability of the AMS changes against AFD (Fig.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…The results of laboratory shock experiments reveal that the primary effects of impact are demagnetization or remagnetization, and magnetic hardening (Gattacceca et al, 2007 and references therein). Gattacceca et al (2007) also demonstrated that explosive-driven shocks of about 10 GPa on basalt and microdiorite acted to change the anisotropy of their low-field magnetic susceptibility (AMS). The AMS of terrestrial rock is usually controlled by the preferred orientation of the magnetic minerals related to the primary formation of the rock or its subsequent tectonic deformation.…”

Section: Introductionmentioning

confidence: 99%

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Shock-induced anisotropy of magnetic susceptibility: impact experiment on basaltic andesite

2007

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Changes in the anisotropy of the low-field magnetic susceptibility (AMS) of basaltic andesite were induced by decaying stress waves and subsequently quantified. An initial shock pressure of 5 GPa was generated in a block of the target rock through impacting with a cylindrical projectile. Following the impact, the maximum or minimum principal susceptibility axes of the target were reoriented toward the shock direction at low (0.5-3 GPa) or high (>3 GPa) estimated shock pressures, respectively. Subtraction of the initial AMS demonstrated a parallelism between the induced susceptibility axes and the shock direction. These results suggest a potential application of AMS as an indicator of the propagation directions of stress waves generated in rocks at terrestrial impact structures.

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“…Gattacceca et al (2007) observed similar changes in AMS for basalt and microdiorite shocked to pressure greater than 10 GPa.…”

Section: Summary and Discussionsupporting

confidence: 56%

Section: Summary and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shock-induced anisotropy of magnetic susceptibility: impact experiment on basaltic andesite

2007

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“…In addition to SRM, a shock event may induce piezoremanent magnetization (PRM) in relatively lower pressure and TRM by heating up to blocking temperatures (e.g. Gattacceca et al 2007). PRM is possibly parallel to the ambient field and effective on lower coercivity part of magnetic minerals (e.g.…”

Section: Remanence Type and Direction Of The Lunar Crust Magnetizationmentioning

confidence: 99%

Lunar Magnetic Field Observation and Initial Global Mapping of Lunar Magnetic Anomalies by MAP-LMAG Onboard SELENE (Kaguya)

et al. 2010

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The magnetic field around the Moon has been successfully observed at a nominal altitude of ∼100 km by the lunar magnetometer (LMAG) on the SELENE (Kaguya) spacecraft in a polar orbit since October 29, 2007. The LMAG mission has three main objectives:(1) mapping the magnetic anomaly of the Moon, (2) measuring the electromagnetic and plasma environment around the Moon and (3) estimating the electrical conductivity structure of the Moon. Here we review the instrumentation and calibration of LMAG and report the initial global mapping of the lunar magnetic anomaly at the nominal altitude. We have applied a new de-trending technique of the Bayesian procedure to multiple-orbit datasets observed in the tail lobe and in the lunar wake. Based on the nominal observation of 14 months, global maps of lunar magnetic anomalies are obtained with 95% coverage of the lunar surface. After altitude normalization and interpolation of the magnetic anomaly field by an inverse boundary value problem, we obtained full-coverage maps of the vector magnetic field at 100 km altitude and the radial component distribution on the surface. Relatively strong anomalies are identified in several basin-antipode regions and several near-basin and near-crater regions, while the youngest basin on the Moon, the Orientale basin, has no magnetic anomaly. These features well agree with characteristics of previous maps based on the 220 H. Tsunakawa et al.Lunar Prospector observation. Relatively weak anomalies are distributed over most of the lunar surface. The surface radial-component distribution estimated from the inverse boundary value problem in the present study shows a good correlation with the radial component distribution at 30 km altitude by Lunar Prospector. Thus these weak anomalies over the lunar surface are not artifacts but likely to be originated from the lunar crustal magnetism, suggesting possible existence of an ancient global magnetic field such as a dynamo field of the early Moon. The possibility of the early lunar dynamo and the mechanism of magnetization acquisition will be investigated by a further study using the low-altitude data of the magnetic field by Kaguya.

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“…Since direct estimation of shock pressure is difficult, indirect indicators, such as shock-induced brittle and ductile deformation features, mineralogical changes, and polymorphism, are commonly used (e.g., Hörz, 1969;Melosh, 1989;Huffman et al, 1993;Kenkmann et al, 2000Kenkmann et al, , 2014Gattacceca et al, 2007;Nishioka et al, 2007;Nishioka and Funaki, 2008). The indicators are weak or commonly absent when the shock pressures are low, especially ≤3 GPa.…”

Section: Introductionmentioning

confidence: 99%

Shock pressure estimates in target basalts of a pristine crater: A case study in the Lonar crater, India

Agarwal

Kontny

Srivastava

et al. 2015

Geological Society of America Bulletin

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The study of shock pressure indicators can provide important clues for understanding the cratering process, though the estimation of shock pressures in weakly shocked rocks is commonly difficult. In this study, we selected a very young and well-preserved impact structure, the Lonar crater in India. The crater, devoid of any tectonic overprint, can be assumed as pristine. We used a combination of rock magnetic and microfracture studies to estimate shock pressure in the crater rim. On the basis of present results, the magnetic fabrics are interpreted to be of magmatic origin related to the Deccan basalt emplacement. The high-coercivity component of the natural remnant magnetization in the crater rim basalt is similar to that in the unshocked basalt. The lack of any shock-related magnetic overprint on the crater rim basalt is, therefore, evident in the Lonar crater.In contrast, radial and concentric microfractures observed in basalts at the crater rim and farther away show symmetric distribution with respect to the crater. The concentric microfractures consistently overprint the radial microfractures. We infer that the radial and concentric microfractures were developed during propagation of the early compressional and the late decompressional shock wave components, respectively. The results of our rock magnetic and microfracture studies, when interpreted in light of published experimental and numerical simulation studies on the Lonar basalt, reveal that the shock pressure in the Lonar crater rim was less than 0.5 GPa but greater than 0.2 GPa. This shock pressure was high enough to produce fractures but too low to affect the magnetic fabrics. These results give new information on the relationship between shock pressure and resulting microfractures.

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The effects of explosive-driven shocks on the natural remanent magnetization and the magnetic properties of rocks

Abstract: Please cite this article as: Gattacceca, J., Lamali, A., Rochette, P., Boustie, M., Berthe, L., The effects of explosive-driven shocks on the natural remanent magnetization and the magnetic properties of rocks,

Cited by 68 publications

References 17 publications

Shock-induced anisotropy of magnetic susceptibility: impact experiment on basaltic andesite

Shock-induced anisotropy of magnetic susceptibility: impact experiment on basaltic andesite

Lunar Magnetic Field Observation and Initial Global Mapping of Lunar Magnetic Anomalies by MAP-LMAG Onboard SELENE (Kaguya)

Shock pressure estimates in target basalts of a pristine crater: A case study in the Lonar crater, India

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