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Tectonomagmatic settings of Jurassic granitoids in the Sanandaj-Sirjan Zone, Iran: A review

Karimpour Mohammad Hassan, Shirdashtzadeh Nargess, Sadeghi Martiya

Geologos

2022

Vol. 28, No. 1

19--37

The present paper discusses the geochemical affinities, origin and ages of Jurassic granitoids of the Sanandaj-Sirjan Zone (SaSZ) in the eastern part of the Zagros Thrust Zone. A multidisciplinary, integrated approach was carried out using existing granitoid geochemical data (major, trace, rare earth element and isotopes) and knowledge of the regional geology (geodynamic and metamorphic setting), coupled with geophysical data (magnetic susceptibility) from granitoids in the SaSZ. We re-interpret and re-classify the Jurassic granitoids of this zone into three main genetic groups: S-type, I-type and A-type subduction-related ones. In the central to southern part of the Sanandaj-Sirjan zone (between Hamadan and Sirjan), S-type magmatism appeared between 178 and 160 Ma during the Cimmerian orogeny, due to continental collision. To the north of the Sanandaj-Sirjan zone (between Sanandaj and Ghorveh), I-type and A-type magmatism occurred between 158 and 145 Ma. This heterogenic tectonomagmatic system along the SaSZ suggests a heterogenic subcontinental lithospheric mantle, resulting in two Jurassic tectonomagmatic zones of (1) the Sanandaj-Ghorveh Zone and (2) the Hamadan-Sirjan Zone.

Assessment of food hazard mapping in urban areas using entropy weighting method: a case study in Hamadan city, Iran

Sepehri Mehdi, Malekinezhad Hossein, Hossein Seyed Zeynalabedin, Reza Ildoromi Ali

Acta Geophysica

2019

Vol. 67, no. 5

1435--1449

Flood is one of the major natural disasters which cause enormous casualties and damages particularly in urban areas. In urban areas, studies on food hazards have been accompanied by tensions for various reasons, including complexity of urban levels, diferent spatial modeling indices, lack of accurate hydrological data, and precise modeling of land surface simulations. This paper used a Constrained Delaunay Triangular Irregular Network to model fne urban surfaces (based on the detailed ground sampling data), and subsequently discusses fve indicators regarding the dangers of food, namely (1) elevation, (2) slope, (3) distance to discharge channels, (4) index of development and persistence of the drainage network (IDPR), and (5) infiltration rate. In the next step for food hazard mapping, the combination of geographical information systems and the entropy weight method as the multi-criteria decision analysis was used to combine the indicators. The proposed methodology was used for Hamadan city that is located in the central part of Hamadan Province in Iran where several foods occur annually. The food hazard mapping indicates that approximately 15.83% of the total study area is classifed as very highly hazardous, 31.72% as hazardous, 20.11% as moderate, 16.02% as minor, and 16.32% as the least hazardous. Finally, superimposition and receiver operating characteristic (ROC) curve methods were used to verify the accuracy of the obtained food hazard map. In terms of superimposition and ROC curve, the accuracy of the model was approximately 70% and 73%, respectively.