Evidence of Quaternary activity along the Deshir Fault: implication for the Tertiary tectonics of Central Iran

Details Evidence of Quaternary activity along the Deshir Fault: implication for the Tertiary tectonics of Central Iran Evidence of Quaternary activity along the Deshir Fault: implication for the Tertiary tectonics of Central Iran

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006geoji.164..192m&link_type=abstract

Geophysical Journal International, Volume 164, Issue 3, pp. 192-201.

Mathematics

Logic

11

Scientific paper

Geological and geomorphologic offsets are used to constrain the total displacement and estimate the slip rate of the right-lateral Deshir Fault. Cumulative morphologic offsets have been found along the southern portion of the fault, on the Iranian Plateau. High-resolution SPOT5 images (pixel size 2.5 m) combined with SRTM DEM document right-lateral offsets of rills, terrace risers and successive alluvial fan systems. Cumulative offsets range from 25 to 900 m and increase with relative elevation, hence relative age, of offset markers. The smallest cumulative offsets are most probably of Holocene age (12 +/- 2 ka) and suggest that the fault slips at an average slip rate close to 2 mm yr-1. Coeval normal faulting is associated to strike-slip motion at several places along the southern portion of the fault. Normal and probably active faults are encountered within the High Zagros 70 km ahead the tip of the Deshir Fault and may suggest the fault is propagating southwards. The total displacement of the Deshir fault, estimated from right-lateral offset of the Nain-Baft suture, is 65 +/- 15 km. The total displacement would have accumulated over the last 25-40 Ma at an averaged Holocene slip rate of 2 mm yr-1. Placing these observations within the framework of the tectonics of Iran allows a discussion of the timing of the transition between collision and subduction in Eastern Iran.

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