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کواترنری ایران، جلد ۱، شماره ۴، صفحات ۳۵۳-۳۶۷
عنوان فارسی آهنگ لغزش چپگرد گسل چوپانان در زمان کواترنری (پلیستوسن)
چکیده فارسی مقاله منطقه مورد مطالعه در خرد قاره ی ایران مرکزی، بلوک یزد، زیر زون انارک- خور و در حاشیه گسل بزرگ کویر قرار دارد. گسل چوپانان از شاخه‌های فرعی گسل بزرگ کویر است که به عنوان گسل اصلی منطقه مورد مطالعه در نظر گرفته شده است. به دلیل کافی نبودن داده‌های زمین لرزه‌های دستگاهی بزرگ بر روی گسل جنبای چوپانان، بررسی توان لرزه‌ای این گسل، بر اساس کاتالوگ زمین لرزه‌ای غیرممکن می‌باشد. در این پژوهش، با توجه به وجود شواهد ریخت زمین‌ساختی متعدد در امتداد گسل چوپانان و شاخه‌های فرعی آن، از جمله جابه‌جایی آبراهه‌های کوچک و بزرگ و مخروط‌افکنه‌ها، حرکت جنبای گسل در بازه زمانی کواترنری بررسی گردید. شواهد ریخت زمین‌ساختی ارائه شده در گستره جغرافیایی خور نشان از حرکت گسل چوپانان در بازه زمانی پلئیستوسن به صورت امتدادلغز چپگرد است. با در نظر گرفتن حرکات افقی در امتداد سامانه گسلی چوپانان در بخش‌های مختلف آن، بیشترین آهنگ لغزش در شمال روستای عروسان در حدود 4 میلی‌متر بر سال محاسبه گردید.
کلیدواژه‌های فارسی مقاله ایران مرکزی، حرکت جنبا، کواترنری
عنوان انگلیسی The Sinistral slip rate of Chupanan Fault during the Quaternary period (Pleistocene)
چکیده انگلیسی مقاله Khur area as the study area is located in the northern part of Central Iran Micro continent. The Central Iran contains three smaller tectonic blocks that consist Lut, Tabas and Yazd blocks. The Khur area is located in the Yazd block and Anarak-Khur sub zone and is surrounded by the GreatKavir Fault (Dorouneh Fault) to the north. The Chupanan Fault is considered as a major branch of the Great Kavir Fault and is the most important fault of the north Khur area. Reason to absence of great systematical earthquake data along the Chupanan fault, checking of seismicity of the area based on earthquake catalog is impossible. In this research, according to the several morphotectonic evidences along the Chupanan fault and its branches, including the displacement of large and small streams and alluvial fans, activity of the faults during Quaternary period is studied. Method The methods used in this research, can be classified into several parts: Satellite images interpretation, field observations, structural analysis. In this research, Satellite images (SAS Planet, Google Earth, ETM and DEM) were used and processed and several faults were identified for the first time. For processing and detection of faults, we used ER Mapper, Global Mapper and Oasis Montaj software's. During geological and structural fields, every observed fault trace was mapped as accurately as the scale of the maps allowed. Fault traces were identified mainly in places where they cut competent rocks. Based on length and role of the faults, faults were separated into principal displacement zones, and minor, secondary faults. Shear sense along the faults was recognized during field studies from analysis of slickenlines and drag of beds along faults. Fault data analyzed by using FaultKinwin5 and Dips software. For checking the tectonic activity of the Chupanan Fault zone and Khur area, Earthquake events data during the period between 1958 and 2015were calculated and then the seismic map is compared with distribution of the study area faults. A few earthquakes with magnitude approximately Mw=5 along the major and map-scale faults have been recorded. Result Field studies and satellite image interpretations indicated that the study area is cut by several sets of faults with different orientations. The distributions of the faults are classified in NE-SW, NW-SE, E-W and N-S. Our analysis showed that the most important set of faults have NE-SW direction and stretched parallel to the Chupanan Fault and have sinistral strike-slip component of movement along the fault planes. The Chupanan Fault has the greatest length and is an active fault because the fault and its branches faults are displaced and cut streams, alluvial fans and terraces and other Quaternary deposits. Chupanan Fault is divided into two major segments to the north and south. The northern segment is an ENE-WSW-trending sinistral fault that disruption and displaced Proterozoic to Quaternary rock units and sediments and streams. Based on several observed offsets along the fault we tried to reconstruct the movement of the fault during the time. The fault slip rate according to the amount of horizontal displacement and the age of tectonic movement was calculated. Reconstruction and calculated slip rate for the northern segment of Chupanan Fault is about 0.09 mm/yr that calculated based on 71 meters offset during 0.790 million years. In the northern Arusan village, the NW-SE-trending faults are displaced Pleistocene sediments about 250 and 500 meters and the calculated slip rates are about 2 and 4 mm/yr, respectively. Conclusion According to the geometry and mechanism of the faults several structures such as pull- apart basin were observed. Abbas Abad basin is one of the examples of structures related to sinistral strike-slip movement of Chupanan fault and its branches faults. The presented morphotectonic evidences in the Khur area indicate that the major movement of the Chupanan fault during Pleistocene is sinistral strike-slip. By considering the horizontal offsets along the Chupanan fault zone in different parts of the area, maximum slip rate is measured about 4mm/yr in the north Arusan village area. By considering faults long, high rate of faults slip rates and large earthquakes recorded around this area, there is the possibility of destructive earthquakes with a long return period. According to this evidence, tectonically, the Khur area in the Central Iran is active.
کلیدواژه‌های انگلیسی مقاله Central Iran, Active motion, Quaternary.
نویسندگان مقاله فاطمه برزی |


علیرضا ندیمی |


نشانی اینترنتی http://journal.iranqua.ir/browse.php?a_code=A-10-1-27&slc_lang=fa&sid=fa
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زبان مقاله منتشر شده fa
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نوع مقاله منتشر شده پژوهشی
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