Skip to Main content Skip to Navigation
Journal articles

Inversion of calcite twin data for paleostress orientations and magnitudes: A new technique tested and calibrated on numerically-generated and natural data

Abstract : The inversion of calcite twin data is a powerful tool to reconstruct paleostresses sustained by carbonate rocks during their geological history. Following Etchecopar's (1984) pioneering work, this study presents a new technique for the inversion of calcite twin data that reconstructs the 5 parameters of the deviatoric stress tensors from both monophase and polyphase twin datasets. The uncertainties in the parameters of the stress tensors reconstructed by this new technique are evaluated on numerically-generated datasets. The technique not only reliably defines the 5 parameters of the deviatoric stress tensor, but also reliably separates very close superimposed stress tensors (30° of difference in maximum principal stress orientation or switch between σ3 and σ2 axes). The technique is further shown to be robust to sampling bias and to slight variability in the critical resolved shear stress. Due to our still incomplete knowledge of the evolution of the critical resolved shear stress with grain size, our results show that it is recommended to analyze twin data subsets of homogeneous grain size to minimize possible errors, mainly those concerning differential stress values. The methodological uncertainty in principal stress orientations is about ± 10°; it is about ± 0.1 for the stress ratio. For differential stresses, the uncertainty is lower than ± 30%.
Document type :
Journal articles
Complete list of metadata

https://hal.sorbonne-universite.fr/hal-01630264
Contributor : Gestionnaire Hal-Upmc <>
Submitted on : Tuesday, November 7, 2017 - 1:52:09 PM
Last modification on : Thursday, March 11, 2021 - 5:47:00 PM

Identifiers

Citation

Camille Parlangeau, Olivier Lacombe, Sylvie Schueller, Jean-Marc Daniel. Inversion of calcite twin data for paleostress orientations and magnitudes: A new technique tested and calibrated on numerically-generated and natural data. Tectonophysics, Elsevier, 2018, 722, pp.462-485. ⟨10.1016/j.tecto.2017.09.023⟩. ⟨hal-01630264⟩

Share

Metrics

Record views

749

Files downloads

488