FN Archimer Export Format
PT J
TI Inversion of calcite twin data for paleostress orientations and magnitudes: A new technique tested and calibrated on numerically-generated and natural data
BT 
AF PARLANGEAU, Camille
   LACOMBE, Olivier
   SCHUELLER, Sylvie
   DANIEL, Jean-Marc
AS 1:1,2;2:1;3:2;4:2;
FF 1:;2:;3:;4:;
C1 UPMC Univ Paris 06, Sorbonne Univ, CNRS, Inst Sci Terre Paris iSTeP, 4 Pl Jussieu, F-75005 Paris, France.
   IFP Energies Nouvelles, 1-4 Ave Bois Preau, F-92500 Rueil Malmaison, France.
C2 UNIV PARIS 06, FRANCE
   IFP ENERGIES NOUVELLES, FRANCE
IF 2.764
TC 22
UR https://archimer.ifremer.fr/doc/00403/51497/90023.pdf
LA English
DT Article
DE ;Inversion method;Calcite twin;Paleostress
AB 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%. Applying the technique to vein samples within Mesozoic limestones from the Monte Nero anticline (northern Apennines, Italy) demonstrates its ability to reliably detect and separate tectonically significant paleostress orientations and magnitudes from naturally deformed polyphase samples, hence to fingerprint the regional paleostresses of interest in tectonic studies. 
PY 2018
PD JAN
SO Tectonophysics
SN 0040-1951
PU Elsevier Science Bv
VL 722
UT 000426022800033
BP 462
EP 485
DI 10.1016/j.tecto.2017.09.023
ID 51497
ER

EF