Strain and vorticity analysis using small-scale faults and associated drag folds

Enrique Gomez-Rivas; Paul D. Bons; Albert Griera; Jordi Carreras; Elena Druguet; Lynn Evans

doi:10.1016/j.jsg.2007.09.001

Strain and vorticity analysis using small-scale faults and associated drag folds

Enrique Gomez-Rivas^*, Paul D. Bons, Albert Griera, Jordi Carreras, Elena Druguet, Lynn Evans

^*Corresponding author for this work

Geology and Geophysics

Research output: Contribution to journal › Article › peer-review

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Abstract

Small-scale faults with associated drag folds in brittle-ductile rocks can retain detailed information on the kinematics and amount of deformation the host rock experienced. Measured fault orientation (alpha), drag angle (beta) and the ratio of the thickness of deflected layers at the fault (L) and further away (T) can be compared with alpha, beta and L/T values that are calculated with a simple analytical model. Using graphs or a numerical best-fit routine, one can then determine the kinematic vorticity number and initial fault orientation that best fits the data. The proposed method was successfully tested on both analogue experiments and numerical simulations with BASIL. Using this method, a kinematic vorticity number of one (dextral simple shear) and a minimum finite strain of 2.5-3.8 was obtained for a population of antithetic faults with associated drag folds in a case study area at Mas Rabassers de Dalt on Cap de Creus in the Variscan of the easternmost Pyrenees, Spain. (C) 2007 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	1882-1899
Number of pages	18
Journal	Journal of Structural Geology
Volume	29
Issue number	12
Early online date	20 Sep 2007
DOIs	https://doi.org/10.1016/j.jsg.2007.09.001
Publication status	Published - Dec 2007

Keywords

strain analysis
vorticity
progressive deformation
faults
drag folds
foliation
flanking structures
shear zones
Eastern Pyrenees
non-coaxiality
deformation
creus
cap
transition
magmatism
nonsense

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NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Structural Geology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Structural Geology, VOL 29, ISSUE 12, 2007 DOI: 10.1016/j.jsg.2007.09.001 © 2007. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Accepted author manuscript, 6.71 MBLicence: CC BY-NC-ND

Cite this

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title = "Strain and vorticity analysis using small-scale faults and associated drag folds",

abstract = "Small-scale faults with associated drag folds in brittle-ductile rocks can retain detailed information on the kinematics and amount of deformation the host rock experienced. Measured fault orientation (alpha), drag angle (beta) and the ratio of the thickness of deflected layers at the fault (L) and further away (T) can be compared with alpha, beta and L/T values that are calculated with a simple analytical model. Using graphs or a numerical best-fit routine, one can then determine the kinematic vorticity number and initial fault orientation that best fits the data. The proposed method was successfully tested on both analogue experiments and numerical simulations with BASIL. Using this method, a kinematic vorticity number of one (dextral simple shear) and a minimum finite strain of 2.5-3.8 was obtained for a population of antithetic faults with associated drag folds in a case study area at Mas Rabassers de Dalt on Cap de Creus in the Variscan of the easternmost Pyrenees, Spain. (C) 2007 Elsevier Ltd. All rights reserved.",

keywords = "strain analysis, vorticity, progressive deformation, faults, drag folds, foliation, flanking structures, shear zones, Eastern Pyrenees, non-coaxiality, deformation, creus, cap, transition, magmatism, nonsense",

author = "Enrique Gomez-Rivas and Bons, {Paul D.} and Albert Griera and Jordi Carreras and Elena Druguet and Lynn Evans",

note = "This work was financed through the PhD grant BES-2003-0755 to EGR and research project CGL2004-03657, both funded by the Spanish Ministry of Education and Science. We thank Jens Becker and Anne Peschler for their help with the BASIL modelling. We gratefully acknowledge D. Jiang and T. Bell, whose constructive reviews greatly improved the manuscript.",

year = "2007",

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doi = "10.1016/j.jsg.2007.09.001",

language = "English",

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TY - JOUR

T1 - Strain and vorticity analysis using small-scale faults and associated drag folds

AU - Gomez-Rivas, Enrique

AU - Bons, Paul D.

AU - Griera, Albert

AU - Carreras, Jordi

AU - Druguet, Elena

AU - Evans, Lynn

N1 - This work was financed through the PhD grant BES-2003-0755 to EGR and research project CGL2004-03657, both funded by the Spanish Ministry of Education and Science. We thank Jens Becker and Anne Peschler for their help with the BASIL modelling. We gratefully acknowledge D. Jiang and T. Bell, whose constructive reviews greatly improved the manuscript.

PY - 2007/12

Y1 - 2007/12

N2 - Small-scale faults with associated drag folds in brittle-ductile rocks can retain detailed information on the kinematics and amount of deformation the host rock experienced. Measured fault orientation (alpha), drag angle (beta) and the ratio of the thickness of deflected layers at the fault (L) and further away (T) can be compared with alpha, beta and L/T values that are calculated with a simple analytical model. Using graphs or a numerical best-fit routine, one can then determine the kinematic vorticity number and initial fault orientation that best fits the data. The proposed method was successfully tested on both analogue experiments and numerical simulations with BASIL. Using this method, a kinematic vorticity number of one (dextral simple shear) and a minimum finite strain of 2.5-3.8 was obtained for a population of antithetic faults with associated drag folds in a case study area at Mas Rabassers de Dalt on Cap de Creus in the Variscan of the easternmost Pyrenees, Spain. (C) 2007 Elsevier Ltd. All rights reserved.

AB - Small-scale faults with associated drag folds in brittle-ductile rocks can retain detailed information on the kinematics and amount of deformation the host rock experienced. Measured fault orientation (alpha), drag angle (beta) and the ratio of the thickness of deflected layers at the fault (L) and further away (T) can be compared with alpha, beta and L/T values that are calculated with a simple analytical model. Using graphs or a numerical best-fit routine, one can then determine the kinematic vorticity number and initial fault orientation that best fits the data. The proposed method was successfully tested on both analogue experiments and numerical simulations with BASIL. Using this method, a kinematic vorticity number of one (dextral simple shear) and a minimum finite strain of 2.5-3.8 was obtained for a population of antithetic faults with associated drag folds in a case study area at Mas Rabassers de Dalt on Cap de Creus in the Variscan of the easternmost Pyrenees, Spain. (C) 2007 Elsevier Ltd. All rights reserved.

KW - strain analysis

KW - vorticity

KW - progressive deformation

KW - faults

KW - drag folds

KW - foliation

KW - flanking structures

KW - shear zones

KW - Eastern Pyrenees

KW - non-coaxiality

KW - deformation

KW - creus

KW - cap

KW - transition

KW - magmatism

KW - nonsense

U2 - 10.1016/j.jsg.2007.09.001

DO - 10.1016/j.jsg.2007.09.001

M3 - Article

VL - 29

SP - 1882

EP - 1899

JO - Journal of Structural Geology

JF - Journal of Structural Geology

SN - 0191-8141

IS - 12

ER -

Strain and vorticity analysis using small-scale faults and associated drag folds

Abstract

Keywords

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