Magnetic fabrics as strain markers in folded soft-sediment layers

Weinberger, R.; Alsop, G. Ian; Levi, T.

doi:10.1016/j.jsg.2022.104513

Cited by 6 publications

(5 citation statements)

References 64 publications

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“…Moreover, interpreting data from Weinberger et al. (2022) highlights a general trend of increasing strain toward localized structures (i.e., thrusts and kinkzones in our models, and hinge zones within folded layers in Weinberger et al. (2022)).…”

Section: Discussionsupporting

confidence: 68%

“…(2022) highlights a general trend of increasing strain toward localized structures (i.e., thrusts and kinkzones in our models, and hinge zones within folded layers in Weinberger et al. (2022)). Although, the structures differ between those in our models and the structures in the unlithified lake deposits within the Dead Sea basin (Weinberger et al., 2022), a general gradual change in the magnetic fabric toward localized structures is manifested.…”

Section: Discussionsupporting

confidence: 65%

“…(2022)). Although, the structures differ between those in our models and the structures in the unlithified lake deposits within the Dead Sea basin (Weinberger et al., 2022), a general gradual change in the magnetic fabric toward localized structures is manifested. These findings show that AMS provides useful insights into the strain distribution in individual imbricates of natural analogs within FTBs at local scales.…”

Section: Discussionmentioning

confidence: 99%

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Magnetic Fabric Signature Within a Thrust Imbricate; an Analog Modeling Approach

2022

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In this study, we report results from three analog models with a similar initial setup and different amounts of bulk shortening, to simulate the development of a thrust imbricate in fold‐and‐thrust belts at different stages. Samples are taken at the back‐ and forethrusts, in the complex forekink zones, and at random distances to thrusts for analysis using anisotropy of magnetic susceptibility as strain indicator. This analysis shows that three distinct types of magnetic fabric can be identified throughout the models: (a) a compactional oblate fabric that changes as a function of distance toward a localized deformation zone (e.g., thrust or kinkzone), (b) a thrust‐induced fabric with magnetic foliation parallel to the thrust surface depicting its geometry, and (c) a complex forekink zone fabric with broad girdle distributions of principal axes and magnetic lineation perpendicular to the shortening direction. The latter indicates an interplay between folding and thrusting of the shortened sand layers. Additionally, a decrease in the degree of anisotropy with appearance of a quantitatively more prolate fabric can be observed toward the thrusts and kinkzones. Moreover, a thrust‐induced fabric is inherited by the variation of strain, depicted by changes in magnetic fabrics. In conclusion, our analysis of model results shows that strain changes as a function of distance toward localized deformation zones with characteristic magnetic fabrics that develop as deformation continues.

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Section: Discussionsupporting

confidence: 68%

Section: Discussionsupporting

confidence: 65%

Section: Discussionmentioning

confidence: 99%

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Magnetic Fabric Signature Within a Thrust Imbricate; an Analog Modeling Approach

2022

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“…In more detail, strain change within a thrust imbricate is revealed by magnetic fabric change toward the thrusts and kinkzones that bound the thrust imbricate. Moreover, interpreting data from Weinberger et al (2022) highlights a general trend of increasing strain toward localized structures (i.e., thrusts and kinkzones in our models, and hinge zones within folded layers in Weinberger et al (2022)). Although, the structures differ between those in our models and the structures in the unlithified lake deposits within the Dead Sea basin (Weinberger et al, 2022), a general gradual change in the magnetic fabric toward localized structures is manifested.…”

Section: Strain Gradient Toward Thrusts and Kinkzonesmentioning

confidence: 60%

“…Moreover, interpreting data from Weinberger et al (2022) highlights a general trend of increasing strain toward localized structures (i.e., thrusts and kinkzones in our models, and hinge zones within folded layers in Weinberger et al (2022)). Although, the structures differ between those in our models and the structures in the unlithified lake deposits within the Dead Sea basin (Weinberger et al, 2022), a general gradual change in the magnetic fabric toward localized structures is manifested. These findings show that AMS provides useful insights into the strain distribution in individual imbricates of natural analogs within FTBs at local scales.…”

Section: Strain Gradient Toward Thrusts and Kinkzonesmentioning

confidence: 60%

Magnetic Fabric Signature within a Thrust Imbricate; an analogue modelling approach

Schöfisch¹,

Koyi²,

Almqvist³

2021

Preprint

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Three main components account for the deformation in fold-and-thrust belts (FTBs); layer-parallel shortening (LPS), folding, and thrusting. In FTBs, most structures like thrusts and folds can be mapped and analyzed with different techniques (e.g., Ramsay & Huber, 1983). However, in the absence of strain markers, penetrative strain (i.e., LPS), which is not always easy to quantify in the field, can also be quantified by focusing on an intrinsic property of the rocks, for example, their magnetic susceptibility. The anisotropy of magnetic susceptibility (AMS) has proven to be a useful tool to study strain in different tectonic regimes and lithologies (e.g.

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Criteria to identify sedimentary sills intruded during deformation of lacustrine sequences

Alsop

Weinberger

Marco

et al. 2022

Journal of Structural Geology

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Magnetic fabrics as strain markers in folded soft-sediment layers

Cited by 6 publications

References 64 publications

Magnetic Fabric Signature Within a Thrust Imbricate; an Analog Modeling Approach

Magnetic Fabric Signature Within a Thrust Imbricate; an Analog Modeling Approach

Magnetic Fabric Signature within a Thrust Imbricate; an analogue modelling approach

Criteria to identify sedimentary sills intruded during deformation of lacustrine sequences

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