The Fars arc accommodates the oblique convergence between the Arabic plate and the Iran block. Many geological observations suggest block rotations from regional to local scales. We present palaeomagnetic investigations in the Fars arc and its eastern termination, the Zagros-Makran syntaxis. Sixty-four sites have been sampled covering the Palaeocene Pabdeh Fm. to Mio-Pliocene Agha-Jhari Fm., the latest being the most sampled formation. We document pre-tilting components in all formations. However, coarse fractions of Agha-Jhari clastics formation retain a post-tilting remagnetization. As a whole, block rotations rarely exceed 20 degrees. In the western Fars arc, clockwise and counter-clockwise rotations of small amplitudes are consistent with the torsions observed near the strike slip Kazerun and Mangarak faults. In the Zagros Makran syntaxis, counter-clockwise and clockwise rotations are observed, respectively, in the western and eastern part. This pattern is consistent with an amplification of the shape of the syntaxis. Between Zagros and Makran, palaeomagnetic data support that the present-day arcuate shape of the arc is secondary. We assume that most of the block rotations took place during the Plio-Pleistocene, during a blocking stage of the Zagros-Makran syntaxis. We emphasize the role of Oman Peninsula which plays as an indenter for the propagation of the Fars thrust belt
To estimate the maximum magnetic anisotropy of the ensemble of magnetic carriers present in a rock, we measured the Anisotropy of Magnetic low field Susceptibility (AMS) of magnetically oriented rock powder. We studied basaltic rock (Chaîne des Puys, Massif Central France) and metasediments (Coffs Harbour, Australia). In the basaltic powder, PSD titanomagnetites show maximum anisotropy of L ≈ 1.16. In the metasediments, the foliation anisotropy is constant (F ≈ 1.3) controlled by iron‐bearing phyllosilicates. The linear anisotropy goes up to L ≈ 2 in pyrrhotite bearing rocks. In contrast, magnetite bearing samples show low linear anisotropy (L < 1.1).
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