Sedimentology
Mohammad Shalalvand; Mohammad Adabi; Afshin Zohdi
Abstract
In this study, the Late Paleocene Taleh Zang Formation in the southwest of Kermanshah hasbeeninvestigatedfor elemental geochemistry and effective diagenetic processes during burial. The thickness of the studied section is 282 meters that mainly composed of shallow marine limestones with interbedded of ...
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In this study, the Late Paleocene Taleh Zang Formation in the southwest of Kermanshah hasbeeninvestigatedfor elemental geochemistry and effective diagenetic processes during burial. The thickness of the studied section is 282 meters that mainly composed of shallow marine limestones with interbedded of marl and dolomite. The main diagenetic processes affecting the TalehZangFormation include micritization, various types of porosity, cementation, dolomitization and compaction. Due to the texture and the abundance of unstable skeletal particles (green algae and bivalve), porosity and cementation aremorecommon among the identified processes. Microscopic and geochemical studies have shown that these processes have taken place in eogenesis and early mesogenesis stages in marine, meteoric and shallow burial environments. Evidences indicate that the carbonates of the TalehZangFormation didnot tolerate deep burial after the deposition during diagenesis. Fluids that affected the lower parts of the formation during burial were mainly marine. Moreover, tothetop ofthe sequence in addition to seawater less meteoric fluids have affected the marine carbonates of the Taleh Zang Formation during diagenesis. The high amounts of Sr/Mn (mean27/51) and Sr/Ca (mean 1/61) and also low Mn (mean 27ppm) and Fe (mean 78ppm) values indicate close digenetic system with low water/rock interaction for the carbonate samples of the TalehZangFormation.
Tectonics
Sepideh Rezabeyk; Abdollah Saidi; Mehran Arian; Ali Sorbi
Abstract
In the Northern part of Suture Zone (Kermanshah) the deep sea sediments, oceanic crust remnants, platform carbonates, igneous and metamorphosed rock of active margin and carbonate sequence of passive margin are assembled in this studied area. This convergent area has provided a very complicated structural ...
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In the Northern part of Suture Zone (Kermanshah) the deep sea sediments, oceanic crust remnants, platform carbonates, igneous and metamorphosed rock of active margin and carbonate sequence of passive margin are assembled in this studied area. This convergent area has provided a very complicated structural zone. The main purpose of this study is stress characteristic analysis. A great data has gathered from the faults which are appeared within the rocks specially the radiolaritic rocks. The data includes characteristics of fault surface geometry, fault slip and lineation slip related. By using the method Right Dihedral, the position of main stress was obtained. The great number of reverse faults have a NW- SW trend, while the strike- slip faults, show a NE- SW direction. The Normal faults with a different displacements appeared younger than the other faults. The result of this study that we obtained the situation of main stress σ1, σ2 and σ3 respectively is 059, 305 and 195.
S.H Vaziri; M Rami; A Matsouka; M.R Majidifard
Abstract
The Halashi 1 section in south of Kermanshah, West Iran with a thickness of 243 m consists of chert, limestone, mudstone, marlstone and shale and can be divided into 10 Beds/Bedsets. From the studied section, which led to identification the genus Pantanellium that is one of the most prolific genera among ...
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The Halashi 1 section in south of Kermanshah, West Iran with a thickness of 243 m consists of chert, limestone, mudstone, marlstone and shale and can be divided into 10 Beds/Bedsets. From the studied section, which led to identification the genus Pantanellium that is one of the most prolific genera among Mesozoic radiolarians, 143 samples were collected. In present study, five species including Pantanellium whalenae, Pantanellium cf. riedeli, Pantanellium cumshewaense,Pantanellium squinaboli andPantanellium cf. lanceola were identified that indicated an Early Tithonian age for the studied section. Identification of species is according to the pore frame number and the configuration, which are important criteria in the taxonomy of the family Pantanelliidae.
R. Elyaszadeh; M. Mohajjel
Abstract
High Zagros zone in southeast Kermanshah is bordered between two Radiolarite and Zagros Fold Belt and consist of abundant NW-SE trending thrust faults and folds sub-parallel to Zagros fold belt. Several structural cross-sections were prepared in NE-SW direction perpendicular to the trend of the structures. ...
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High Zagros zone in southeast Kermanshah is bordered between two Radiolarite and Zagros Fold Belt and consist of abundant NW-SE trending thrust faults and folds sub-parallel to Zagros fold belt. Several structural cross-sections were prepared in NE-SW direction perpendicular to the trend of the structures. Main thrusts were cut by some local strike-slip faults due to difference in their displacement. The Kohsefid thrust fault (FA) is one of the main thrusts that divide the northern Radiolarite zone from the High Zagros Zone. This fault is limiting the southern boundary of the Radiolarite zone. It displaced as a reverse fault during contraction tectonic in Late Cretaceous. The flysh facies of Amiran formation in Zagros Fold Belt with Paleocene age contain radiolarite fragments and confirms this event. It seems that the Garo Formation plays a detachment surface role for these thrusts in the High Zagros zone. The foreland in Zagros, commenced to deform by thrusting and folding in Late Cretaceous in the High Zagros zone and by later collision of the Arabian plate with the Iranian plate, rock units in the Zagros Fold Belt were deformed.
M. Mohajjel; M. Biralvand
Abstract
Abundant chevron folds were produced in well-bedded red thin layers radiolarites in Kermanshah area. Various fold hinge area structures were produced due to competency contrast and change of thickness in radiolarian shale and thick-bedded limestone intercalation in radiolarite sequence. Different styles ...
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Abundant chevron folds were produced in well-bedded red thin layers radiolarites in Kermanshah area. Various fold hinge area structures were produced due to competency contrast and change of thickness in radiolarian shale and thick-bedded limestone intercalation in radiolarite sequence. Different styles of folding exist in massive to thick-bedded limestone and shale where they are inter-bedded with radilarites. Unique thin layers of the radolarite layers were folded in parallel shape but change of folds shape and mechanism were produced where thick bedded limestone or thin layers of radiolarian shale intercalations exist. Fold accommodation faults were generated in cases during folding. Geometry and style of folding indicate that deformation in radiolarites was produced by parallel folding due to buckling mechanism with southwest vergence. Thrust faults were generated during later stages, displacing some parts of the folded radiolarites.
A. Maleki
Abstract
The Large numbers of provinces in country use Karst's water Sources as a main Source of securing water for using in different ground of drinking-agriculture and industry. Kermanshah province with an area about 24953,286 square kilometers is located in the middle of western side of the country which its ...
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The Large numbers of provinces in country use Karst's water Sources as a main Source of securing water for using in different ground of drinking-agriculture and industry. Kermanshah province with an area about 24953,286 square kilometers is located in the middle of western side of the country which its main part is in the zones of nappe and foliated Zagross and its heights are often formed of the hard carbonated formations. The Karsti zonations of Kermanshah province play an important role in the providing and feeding of aquiferouses; for this reason to recognize these zonations and the rate of their modification , the zonation of the modification of the karst is done in this research and its map has been drawn too . For the purpose of acquiring of the aims of the research , first the closed superficial holes as the index of the modification of the karst were recognized by using the topographic maps 1 / 50000 and the recognizing pictures 5 meters irs (BW) , their maps were drawn and after examining statistically and confirm the relationship the maps with the subject , with the help of the Kay square and the rotary operation , seven factors of height , lithologic , geomorphology , temperature , rainfall , vaporization and slope as the effective factors in the modification of the karst have been selected . After digitalization of all of the respective data for evaluation ( giving weight ) the classes of the maps of aquired from the statistics ways , analysis of the hierarchic ( expertizing judgement ) , condensation of the surface , the informational value , the variables weight and the experimental way were used . Then in the environment of gis the maps of the factor of overlapping and the maps of the zonation the modification of the karast has been aquired with the 5 ways mentioned .Among the ways used for zonation , the way of the informational value has the most adaption with the selected index (the closed holes) in the zone being studied .The aquired maps of zanation, beside the determinination of the zones with different degrees of modification of the karst's from in the province, It also has detemined the feeding Limitations of underground waters (Karst) and the favourable areas for Pollution of these Sources in the surface of earth.Which should use Suitable Policy for protecting these areas, Other wise many gangers will threat the feeding places.
