Magnetic fabric: methods and applications — an introduction

Martín-Hernández, F.; Luneburg, Catalina; Aubourg, Charles; Jackson, Michael J.

doi:10.1144/gsl.sp.2004.238.01.01

Cited by 50 publications

(34 citation statements)

References 66 publications

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“…AMS is a powerful nondestructive petrofabric tool. The AMS is controlled by individual grains in which the crystallographic orientation or grain shape orientation creates a preferred direction of magnetization [ Martin‐Hernandez et al ., ; Parés et al ., , for a review]. The application of AMS methods in sediments deposited in compressional tectonic settings has proved to be a reliable paleostress indicator, and AMS can be a very useful tool to unveil complex tectonic histories [ Kligfield et al, ; Borradaile and Henry, ; Parés et al, ; Robion et al, ; Soto et al, ; Roperch et al, ].…”

Section: Introductionmentioning

confidence: 99%

The curved Magallanes fold and thrust belt: Tectonic insights from a paleomagnetic and anisotropy of magnetic susceptibility study

et al. 2014

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The Magallanes fold and thrust belt (FTB) presents a large-scale curvature from N-S oriented structures north of 52°S to nearly E-W in Tierra del Fuego Island. We present a paleomagnetic and anisotropy of magnetic susceptibility (AMS) study from 85 sites sampled in Cretaceous to Miocene marine sediments. Magnetic susceptibility is lower than 0.0005 SI for 76 sites and mainly controlled by paramagnetic minerals. AMS results indicate that the sedimentary fabric is preserved in the undeformed areas of Tierra del Fuego and the more external thrust sheets units, where an incipient lineation due to layer parallel shortening is recorded. Prolate AMS ellipsoids, indicating a significant tectonic imprint in the AMS fabric, are observed in the internal units of the belt. AMS results show a good correlation between the orientation of the magnetic lineation and the fold axes. However, in Península Brunswick, the AMS lineations are at~20°counterclockwise to the strike of the fold axes. Pretectonic stable characteristic remanent magnetizations (ChRM) were determined in seven sites. A counterclockwise rotation (21.2°± 9.2°) is documented by ChRM data from four sites near the hinge of the belt in Península Brunswick and near Canal Whiteside while there is no evidence of rotation near the nearly E-W oriented Vicuña thrust within Tierra del Fuego. The curved shape of the Cenozoic Magallanes FTB is not related to vertical axis rotation, and thus, the Magallanes FTB can be considered as a primary arc.

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Section: Introductionmentioning

confidence: 99%

The curved Magallanes fold and thrust belt: Tectonic insights from a paleomagnetic and anisotropy of magnetic susceptibility study

et al. 2014

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“…4a, b). Hrouda (1982), Tarling and Hrouda (1993), Borradaile and Henry (1997), Tauxe (2002), Martín-Hernández et al (2004), Cho et al, (2007Cho et al, ( , 2014, (Jelínek, 1981;Hrouda, 1982;Tarling and Hrouda, 1993 (Rochette et al, 1992;Tarling and Hrouda, 1993;Bouchez, 1997). 각 시편에서 측정된 평균대자율을 각 석산별로 상 용로그 값으로 나타내었으며 (Fig.…”

Section: 지질학적 배경mentioning

confidence: 95%

Determination of Rock Cleavages Using AMS (Anisotropy of Magnetic Susceptibility): a Case Study on the Geochang Granite Stone, Korea

Cho¹,

Kim²,

Kim³

et al. 2015

The Journal of the Petrological Society of Korea

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In granite quarry, stones are generally quarried along easily separating planes called as 'rock cleavage'. Because orientation and characteristics of the rock cleavage are directly involved with easy quarrying, it is the most important factor on selecting a direction of digging. Using AMS (anisotropy of magnetic susceptibility), we attempt to interpret rock fabrics in Geochang Granite Stone (JS, SD, AR, GD, BW, MD quarry) and discuss about determination of rock cleavages and correlation between the rock fabrics and cleavages. Based on mean susceptibility, thermo-susceptibility curves, and hysteresis parameters, Ti-poor MD and/or PSD magnetites are the main contributor to AMS of the granite stones. The systematic magnetic foliations with sub-vertical dip angle are developed in the whole granite quarries. In most of the granite quarries, the magnetic foliations are significantly consistent with grain plane. In the BW quarry, which has higher P J values than the others, the magnetic foliations coincide exceptionally with

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“…The anisotropy of mineral grains within rocks often reflect structural information created during their formation or subsequent deformation (i.e., paleo‐flow directions, stress directions, etc.) [ Martin‐Hernández et al , 2004]. Magnetic anisotropy in rocks is controlled by the crystalline anisotropy (predominantly in hematite or paramagnetic minerals), by the grain shapes and by the arrangement of individual grains [ Tarling and Hrouda , 1993].…”

Section: Applicationmentioning

confidence: 99%

The SushiBar: An automated system for paleomagnetic investigations

Wack¹,

Gilder²

2012

Geochem Geophys Geosyst

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[1] We present a new, automated system based on a three-axis superconducting magnetometer and a custom-made coil designed to experiment on cylindrical specimens used in typical paleomagnetic investigations. The system, which resembles a sushi bar, facilitates stepwise alternating field demagnetization of up to 99 samples per loaded track. It also enables researchers to explore magnetic properties using an anhysteretic remanent magnetization (ARM) in any coercivity window up to peak alternating fields of 95 mT with direct current bias fields up to 0.17 mT. For example, partial ARM (pARM) spectra characterize magnetic grain size distributions in rocks, yet rarely are pARM spectra measured because the complete curve for one sample takes at least two hours to acquire manually. The SushiBar achieves 99 such curves in slightly less than 100 hours. Using the SushiBar, we measured the pARM sprectra, as well as the viscosity and anisotropy of ARM in three discrete switching field windows, of continental sediments from the Xishuigou section (western China). The average grain size remains constant along the 2200 m-thick section, yet magnetic viscosity varies systematically from bottom to top of the section; samples with high magnetic viscosities also have higher proportions of non-viscous material on average. Principal anisotropy axis directions from the lowest switching fields correlate well with principal axis directions from anisotropy of magnetic susceptibility. Principal axis directions defined at higher switching fields systematically deviate from those at lower switching fields, perhaps defining the fabric of the remanence-carrying grains.

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Magnetic fabric: methods and applications — an introduction

Cited by 50 publications

References 66 publications

The curved Magallanes fold and thrust belt: Tectonic insights from a paleomagnetic and anisotropy of magnetic susceptibility study

The curved Magallanes fold and thrust belt: Tectonic insights from a paleomagnetic and anisotropy of magnetic susceptibility study

Determination of Rock Cleavages Using AMS (Anisotropy of Magnetic Susceptibility): a Case Study on the Geochang Granite Stone, Korea

The SushiBar: An automated system for paleomagnetic investigations

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