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- 저자 : Khalil Sarkarinejad (검색결과 2 건)
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Quantitative kinematic analysis of the asymmetric boudins of the Zagros accretionary prism, Iran
Khalil Sarkarinejad,Saeede Keshavarz 한국지질과학협의회 2015 Geosciences Journal Vol.19 No.3
Asymmetric boudins that are widespread in the Seh- Ghalatoun area in the Neyriz, southwestern Iran are good indicators to estimate the kinematic vorticity number (Wk) and sense of shear. This area is part of the Sanandaj-Sirjan HP-LT metamorphic belt located within the Zagros orogenic belt. Boudins have been analyzed on the meso- and micro-scales. Domino and shearband boudins are developed in deformed quartzitic layers associated with quartzo-feldspathic gneiss, amphibolite, mica-schist and marble. Shearband boudins with backward rotation and domino boudins with forward rotation, mantled porphyroclasts, drag folds, and asymmetric folds which all display a dextral sense of shear. The mean kinematic vorticity number was estimated by using the asymmetric boudin hyperbolic distribution method and quartz caxis patterns. The estimated mean kinematic vorticity number is Wk = Wm = 0.85 ± 0.04, which indicates 34% pure shear and 66% simple shear components of deformation. The estimated mean deformation temperature based on the opening angle of the quartz c-axis fabrics is 530 ± 50 °C. These quantitative analyses suggest a sub-simple shear deformation developed at the epidote-amphibolite to amphibolite facies conditions at depth along the Sanandaj- Sirjan HP-LT metamorphic belt, which is associated with a transpressional flow regime with shortening perpendicular to the shear zone boundary.
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Zahra Tajmir Riahi,Khalil Sarkarinejad,Ali Faghih,Bahman Soleimany,Gholam Reza Payrovian 한국지질과학협의회 2023 Geosciences Journal Vol.27 No.3
The major faults in the Rag-e-Sefid oil/gas field and surrounding areas are detected by integrating digital satellite, aeromagnetic, and seismic data to improve resolution and reduce ambiguity. The main structural lineaments are extracted through the processing of satellite images. The continuity of the lineaments onto the magnetic basement is analyzed by processing the aeromagnetic data, which reveals the distribution of the basement faults, their relationship with each other, and their segmentation or continuation in the magnetic basement. The seismic profiles across the major faults support resolving the predominant geological structures of the region and identifying the sense of movement on the fault surfaces. In addition, fieldwork was performed to verify the detections and characterize the status and mechanism of the identified faults. The results indicate that the main detected faults in the area are classified into seven major categories: the Nourooz-Hendijan-Izeh, NW and SE Rag-e-Sefid, Zagros Frontal, Kharg-Mish, Izeh, and Mountain Front faults. The Rag-e-Sefid and the Nourooz-Hendijan-Izeh Faults have been considered critical structural lineaments in creating the final geometry of the Rag-e-Sefid anticline and have controlled the fracture characteristics in the Asmari reservoir.
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