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Calcite twinning constraints on paleostress patterns and tectonic evolution of the Zagros hinterland: the Sargaz complex, Sanandaj–Sirjan zone, SE Iran

تقييد توأمة الكالسيت على نمط الجهد القديم و تطور التكتونى لمنطقة زاجروس الخلفية، معقدة سارجاس ، نطاق سانانداج-سيرجان، جنوب شرق إيران

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Abstract

Based on analyses of calcite twins, we constrain the tectonic history of the Paleozoic Sargaz complex within the SE part of the Sanandaj–Sirjan zone (hinterland domain of the Zagros orogen), SE Iran. The mean width of measured calcite twins was 1.97 μm, corresponding to the width of type II twins; variations in twin width with twin density indicate that calcite twinning in the study area occurred at temperatures of between 170 and 200°C. These results support the interpretation that the twins developed at a shallower depth and lower temperature than those of greenschist facies metamorphism recorded in this complex, and that twinning is therefore mainly a late, post-metamorphic deformation process. The c-axis fabrics of the studied samples are monoclinic, consisting of an intense point maximum located slightly anticlockwise of the normal to the shear plane; this asymmetry indicates non-coaxial deformation and a dextral component of shear in the thrust zones. The geometric relationship between stress axes and bedding reveals that the reconstructed stress tensors mainly post-date F1-folding. Compressional stress axes are oriented NE–SW. This compressional stress was probably related to the (oblique) subduction of the Neotethys beneath Central Iran by Middle Triassic–Jurassic times, during the Cimmerian orogeny.

Abstract

اعتمادا على تحليلات توأم الكالسيت نقيد التاريخ التكتونى لمعقدة سارجاز ضمن الجزء الجنوبي الشرقي من نطاق سانانداج-سيرجان بجنوب شرق إيران. متوسط عرض توأم الكالسيت كان 1.97 ميكرون بالنسبة لعرض التوأم من النوع II. إن الاختلافات في عرض التوأم مع كثافة التوأم تدل على أن توأمة الكالسيت في منطقة الدراسة تمت عند درجة حرارة بين 170 – 200 درجة مئوية. تدعم هذه النتائج التفسير بأن التوأم تطور عند عمق ضحل ودرجة حرارة منخفضة بالمقارنة لتحول سحنات الشيست الأخضرالمسجلة في هذه المعقدة وبالتالي فإن التوأمة هي عملية تشوه تحولي متأخرة . أثبتت الدراسة أن أنسجة العينات المدروسة (عبر المحور c) وحيدة الميل تتكون من نقطة عظمى حادة تقع عكس عقارب الساعة فى مستوى عمودي على اتجاه مستوى القص. يدل عدم التماثل هذا على تشوه غير متحد المحور . تدل العلاقة الهندسية بين محاور الإجهاد ومستويات التطابق على أن الإجهاد أساسا أحدث من الطي F1. وتتجه محاور الإجهاد التضاغطي شمال شرق – جنوب غرب . يمكن أن يكون هذا الإجهاد التضاغطي له علاقة بالغطس المائل للوح للنيوتيتش NeoTethys تحت لوح منتصف إيران فى منتصف العصر الترياسى – الجوراسى خلال حركات السيميريان التكتونية.

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Acknowledgments

This study is the result of a Ph.D thesis (Shafiei 2007) defended in the faculty of Earth Sciences, University of Shahid Beheshti. Fieldwork was supported by The Geological Survey of Iran (Kerman Center, SE Iran). SH Shafiei thanks M Hoseani, M Nazemzadeh, M Ghorbani and Gh Iranmanesh for their friendly help during fieldwork.

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Shafiei, S., Alavi, S.A. & Mohajjel, M. Calcite twinning constraints on paleostress patterns and tectonic evolution of the Zagros hinterland: the Sargaz complex, Sanandaj–Sirjan zone, SE Iran. Arab J Geosci 4, 1189–1205 (2011). https://doi.org/10.1007/s12517-010-0140-3

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