Thomas, Jean-Charles and Grasso, Jean-Robert and Bossu, Remy and Martinod, Joseph and Nurtaev, B. S. (1999) Recent deformation in the Turan and South Kazakh platforms, western central Asia, and its relation to Arabia-Asia and India-Asia collisions. Tectonics, 18 (2). pp. 201-214. DOI: https://doi.org/10.1029/1998TC900027
Full text not available from this repository.Abstract
In this study, we investigate the recent and active tectonics of the Turan and South Kazakh platforms in western central Asia. This area, which has been considered stable during the Tertiary, was struck in its eastern part (Gazli and Kyzyl‐Kum) by three earthquakes of magnitude Ms ∼7.0 between 1976 and 1984. From structural observations we show that in the Kyzyl‐Kum, Cenozoic deformation on structures oriented NW–SE is dominated by dextral strike‐slip motion on a flower structure involving reactivated Late Paleozoic faults. This deformation is compatible with the stress pattern induced by the Pamir/Tien Shan collision zone. At the scale of the Turan‐South Kazakh platform, comparison of repeated leveling measurements gives mean uplift rates of 5 mm yr−1 for most of the area south of the 44° latitude including the Kyzyl‐Kum. These observations indicate that the Turan‐South Kazakh platform has been actively deforming since recent times (Pleistocene) in response to the collision of both India and Arabia with Asia. Earthquake data also reveal that propagation of deformation from the Kopet Dagh and the Pamir/Tien Shan collision zones into the Turan‐South Kazakh platform is accommodated aseismically except in the Kyzyl‐Kum. This might reflect differences in the deformation style and nature of the upper crust in the Kyzyl‐Kum and north of the Kopet Dagh respectively. We propose that the Gazli earthquakes highlight the northwestward continuation, within the Turan‐South Kazakh platform and along reactivated older structures, of the deformation related to the Pamir indentation and to a lesser degree to the Arabia‐Asia convergence.
| Item Type: | Article |
|---|---|
| Subjects: | Region > Uzbekistan Methodology > Method and procesing |
| Project: | EPOS-IP > GAZLI: hydrocarbon field |