Mehdi Ramazani; Hojjat Ollah Safari; Homayon Safaei; Gholam Hosein Shamaanian
Abstract
Taft area is located in the central part of Urmia-Dokhtar Magmatic Arc (UDMA), adjacent to Western block of Dehshir Major Fault, in the south of Yazd city. The UDMA is one of the favorable regions for occurrence of porphyry and Skarn copper deposits with more than identified 100 copper occurrences. It ...
Read More
Taft area is located in the central part of Urmia-Dokhtar Magmatic Arc (UDMA), adjacent to Western block of Dehshir Major Fault, in the south of Yazd city. The UDMA is one of the favorable regions for occurrence of porphyry and Skarn copper deposits with more than identified 100 copper occurrences. It seemed that these Cu occurrences are related to structures, especially major and main faults. Therefore, the Taft area is selected for investigation on relationship between Cu mineralization and Tectonics (and structures). The Aliabad and Darre Zereshk are two important Cu indices in this area. In this research, the main structures are extracted and analyzed by using Remote sensing techniques, GIS environment and Field investigations. The results shown that a Structural Rhombohedral shape was created by two order faults with N150-170 and N110-120 strikes activation. In follow, the third-stage of faulting with N60-70 trend cut and offset the all of other formed structures and known as youngest order of faulting in this area. This stage of faulting was taken placed during initiation of collision between Arabian plate and Iranian Micro plates in Oligocene-Miocene episode. Because, this fault zone was formed perpendicular to collision zone, it has tension component and prepared a suitable environment for Granitoid body’s injection in this time. This phenomenon has main role in forming of Porphyry- Skarn Cu mineralization in length of this fault zone.
S. M. Tabatabaeimanesh; H. Safaei; A. S. Mirlohi
Abstract
In south of Kashan, early Paleozoic volcanic rocks are a part of Ghohrudmountains. In Iran structural- sedimentary division, these volcanic rocks located inUrumieh- Dokhtar zone. These volcanic rocks are basic to semibasic and mostly involved basalt. Geochemical investigations of these rocks show the ...
Read More
In south of Kashan, early Paleozoic volcanic rocks are a part of Ghohrudmountains. In Iran structural- sedimentary division, these volcanic rocks located inUrumieh- Dokhtar zone. These volcanic rocks are basic to semibasic and mostly involved basalt. Geochemical investigations of these rocks show the alkaline nature and the intra-continental rift geotectonic setting in their formation time. The Isfahan fault is a north-trending fault across the Sanandaj-Sirjan zone. This fault is one of the old and basement fault that was active in the early Paleozoic. The unique present of Silurian volcanic rocks in this area can refer to the activation of the north part of this fault that was created by extension phases after Caledonian orogeny.
R. Sharifi Najafabadi; M. Moairy; H. A. Ghayoor; H. Safaei; A. Seif
Abstract
One of The important subjects about Zagros mountain range is the lack of coordination between its drainages and geologic structure. This subject on Zayandehrood drainage system has become one of the most challenging discussions and three different theories have been proposd . To remove these disagreements ...
Read More
One of The important subjects about Zagros mountain range is the lack of coordination between its drainages and geologic structure. This subject on Zayandehrood drainage system has become one of the most challenging discussions and three different theories have been proposd . To remove these disagreements and to achieve a general conclusion, this basin and two basins of Azna and Kakolestan at a distance of 62 and 85 km form its north east limit were studied exactly in library and in the field. With referrer to different evidence obtained from the condition of river terraces, lake sediments and fossils, cirques and glacial sediments and active tectonic, it may be concluded that during Pliocene the Zagros drainages have been flowing toward Persian Gulf, but this drainages have been trapped because of the activity of Main Recent Fault at late this period or Early Pleistocene and formed some lakes. Later as the result of some processes that most of them have been of tectonic origin, the bed of these lakes were disintegrated and the water stream was flowed in Kakolestan and Azna’s basins at the previous direction and in Zayandehrood basin at the revers direction.
