Writers : Soffel;Davoudzadeh; Rolf;Schmidt
Refference : Geosciences Scientific Quarterly Journal,No.:14,P.:79
Publishing Year : 1372

Abstract :

New Palaeomagnetic sampling was carried out In Central Iran In 1986 and in 1991-92 with the alm to extend our previous studies. Several new reliable pole positions could be obtained for the Central East Iran Mlcroplate (CEIM) confirming the general trend of its Apparent polar Wander path (APWP) from the Triassic through the Tertiary: (i) Area of Nakhlak (33. 35N, 53.50 E), Trlassic limestones and tufts, 12 samples, D = 94.0, I = 25. 0 , a95 = 24. 7 , virtual geomagnetic pole position (VGP) at 310. 9 E, 3.9 S. (ii) Area of Saghand (32.5 N, 55. 3 E), Cretaceous llmestones, 17 samples, D- 338. 5, I- 25. 2 , a95- 5.2, VGP at 285. 9 E,62. 5 N. (iii) Area of Sirjan (29. 4 N, 55.1 E), Triassic volcanics, 19 samples, D-115.5, 1-35.4 , a95- 3.9, VGP at 295.1 E, 10.9 N. Combining all Triasslc pole positions for the CEIM yields a new Triassic pole at 313. 0 E, 12.4 N, N - 5, A95 - 16.2 , which confirms the large rotation of the CEIM since the Trlassic.
In the area of Natanz (33. 35 N, 51.50 E; 100 km N of Esfahan), Triassic dolomites, limestones, sandstones and siltstones (161 specImens from 5 sites) gave a mean direction of the 5 sites at D- 33.3, I = 25.1, A95 = 9.3 (passing a positive fold test on the level of 99%) and a VGP at 167. 6 E, 53.6 N, A95 = 9.3. This pole position is In fairly good agreement with the mean Triassic pole position of the Turan plate (149 E, 49 N). It indicates that the area of Natanz has not undergone the large antlclockwise rotation relative to the Turan plate since the Triassic.