Opposite shear senses: Geneses, global occurrences, numerical simulations and a case study from the Indian western Himalaya

Dutta, Dripta; Mukherjee, Soumyajit

doi:10.1016/j.jsg.2019.05.008

Cited by 48 publications

(3 citation statements)

References 344 publications

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“…The same kinematic indicators are recognized in the calcite-mylonite along the Orbai back-thrust [63]. Rarely, an opposite shear sense has even been detected, as commonly observed in mylonitic shear zones [88,89].…”

Section: The Back-thrusts Of the Marganai Areasupporting

confidence: 64%

Mechanical Influence of Inherited Folds in Thrust Development: A Case Study from the Variscan Fold-and-Thrust Belt in SW Sardinia (Italy)

Cocco¹,

Funedda²

2021

Geosciences

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Fold-and-thrust belts have a high variability of structural styles, whose investigation provides continuous updates of the predictive models that try to better approximate the geometries recognized in the field. The majority of studies are focused on the geometry and development of folds and thrust surfaces and the amount of displacement, taking into account the role played by the involved stratigraphic succession assumed as a layer cake. We present a case study from the external zone of the Variscan fold-and-thrust belt in SW Sardinia, where it was possible to investigate the lateral and vertical variations of the mechanical properties of the involved succession, how they related to previous folding, control thrust geometry, and kinematics. In this case, the superposition of two fold systems acted as a buttress that induced extensive back-thrusting. We found that there is a close connection between the attitude of the bedding and the geometry of back thrust surfaces, shear strength during thrust propagation, and variation in the shortening amount, depending on which part of the folds were cut across. The folding-related mechanical anisotropy also seems to have induced a ductile deformation in the footwall of back-thrusts. Although the case study considers the development of back-thrust, the relations between thrust and not-layer cake geometries could also be applied to fore-thrust development.

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Section: The Back-thrusts Of the Marganai Areasupporting

confidence: 64%

Mechanical Influence of Inherited Folds in Thrust Development: A Case Study from the Variscan Fold-and-Thrust Belt in SW Sardinia (Italy)

Cocco¹,

Funedda²

2021

Geosciences

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show abstract

“…The larger grains of orthopyroxene and plagioclase are sheared (Fig. 3c) and often suggest opposite senses of ductile shear (Dutta and Mukherjee, 2019). Using the EBSD data, we measured the sizes (equivalent diameter) of quartz and hematite grains.…”

Section: Petrography Grain Size and Deformation Microstructuresmentioning

confidence: 99%

Deformation mechanisms and characteristics of the meta-BIFs from an early Proterozoic shear system of the Southern Granulite Terrane (SGT), India

Dutta

Misra

Karmakar

2022

Journal of Structural Geology

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“…Transpression is a combination of strike-slip shear and shortening and/or extension along the shear zone (Harland 1971;Sanderson and Marchini 1984;Fossen and Tikoff 1993;Schulmann et al, 2003;Mukherjee, 2015;Dutta and Mukherjee 2019;Bose and Mukherjee 2019a,b). Transpression zones are results of oblique convergence of lithospheric plates.…”

Section: Introductionmentioning

confidence: 99%

Slip partitioning and inclined transpression in the Bazargan fold and thrust belt, Central Iran Microcontinent, Kerman area, SE Iran

Ebrahimi

Shafieibafti

Derakhshani

et al. 2021

Journal of Structural Geology

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Opposite shear senses: Geneses, global occurrences, numerical simulations and a case study from the Indian western Himalaya

Cited by 48 publications

References 344 publications

Mechanical Influence of Inherited Folds in Thrust Development: A Case Study from the Variscan Fold-and-Thrust Belt in SW Sardinia (Italy)

Mechanical Influence of Inherited Folds in Thrust Development: A Case Study from the Variscan Fold-and-Thrust Belt in SW Sardinia (Italy)

Deformation mechanisms and characteristics of the meta-BIFs from an early Proterozoic shear system of the Southern Granulite Terrane (SGT), India

Slip partitioning and inclined transpression in the Bazargan fold and thrust belt, Central Iran Microcontinent, Kerman area, SE Iran

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