Bu-Ali Sina University
New Findings in
Applied Geology
2228-5873
2981-0264
7
14
2014
02
20
Fabric analysis and investigation of geometric symmetry in the Tange Koraki shear zone, southeastern Eghlid
1
8
FA
B.
Samani
samani.babak@gmail.com
Study of structural fabrics as the shear sense indicators of the shear zones are an important instrument for study and determination sense of shear. Definition of geometry of shear zones will help to understand structural evolution of shear zones. Determination of vorticity vector based on the 3-D structural studies in many cases is very difficult. Study of lineations, foliations and shear zone boundaries and vorticity normal section are important and will help to understand the geometry of shear zones. In this paper, using of theoretical aspect of shear zones the main parameters of shear zones geometry has been studied. Moreover for determination of shear indicators and deformation geometry we carried out a case study in the area that is located in the Sanandaj-Sirjan HP-LT metamorphic belt. Our results show dextral sense of shear and scattering of lineation and pole of foliation around vorticity normal section. Also the stereographic analysis of structures shows a triclinic geometry for the study area. Finally we suggest the triclinic inclined transpression model for structural evolution of this shear zone.
Finite strain ellipsoid,shear zone,Transpression,Vorticity vector
https://nfag.basu.ac.ir/article_554.html
https://nfag.basu.ac.ir/article_554_e69ea03e18093f66b01064dd12f3f0f4.pdf
Bu-Ali Sina University
New Findings in
Applied Geology
2228-5873
2981-0264
7
14
2014
02
20
The study of Peri-Tethys and Peri-Gondwana marine deposits in
different regions of Iran
9
21
FA
S.
Arefi Fard
Distribution of fusulinid faunas in different regions of Iran indicates the presence of both warm-water Peri-Tethyan-related assemblages and cool/cold-water Peri-Gondwanan-indicating ones. In Alborz, most parts of Central Iran, Abadeh and Dzhulfa regions, genera and species of verbeekinid and neoschwagerinid fusulinids are present that in term of fusulinid paleobiogeography, they are assignable to Peri-Tethyan Realm. The warm-water fusulinid diversity in Abadeh and Dzhulfa regions is partly higher compared with Alborz and Central Iran suggesting that these regions may have occupied a comparatively lower latitudinal position within Tethyan realm. Kalmard region in Central Iran having southern anti-tropical fusulinid faunas is charachteristic of cool/cold-water Peri-Gondwanan faunas. Starting from Kubergandian through lower Midian, Zagros was located within the temperate climatic belt and only by middle-late Midian it has been closer to Equator.
Marine deposits,Peri-Tethys,Peri-Gondwana,Iran
https://nfag.basu.ac.ir/article_555.html
https://nfag.basu.ac.ir/article_555_a8d542f034835fea6688023865cf94f9.pdf
Bu-Ali Sina University
New Findings in
Applied Geology
2228-5873
2981-0264
7
14
2014
02
20
Mineralization, and Igneous Rock Masses Study in Khunik Area (Northeast Qaen)
22
35
FA
H.
Fattahi
khosrofattahi@yahoo.com
I.
Rasa
M.
Yazdi
M.
Hosseini
The Khunik area is located in northeast Qaen city. Volcanic rocks of this area belong to the Eocene volcanic activity. The rock sequences in this area consist of, Trachy andesite, Andesitic basalt, Aglomerate and tuff. Porphyritic and Trachytic textures are the predominant textures in this region, but sometimes, the sieve, intergranular and intersertal textures can be seen too. The alteration in area includes sericitization, argillization, Chloritization, carbonatization and silisification, especially along the faults. In chemical classification, the rocks of Khunik area, will plotted in Andesite to trachy andesite field and belong with calkalkaline series and continental arc subduction tectonic setting. HFSE elements such as Ti, Y and Nb, have depletion with respect to the rare earth elements and LILE. Depletion of HFSE and K, Sr, Ba enrichment, indicating contamination with crustal materials. <br />
https://nfag.basu.ac.ir/article_556.html
https://nfag.basu.ac.ir/article_556_12515980cee8a71bc9d0816c5df82d89.pdf
Bu-Ali Sina University
New Findings in
Applied Geology
2228-5873
2981-0264
7
14
2014
02
20
The assessment of soil slopes instability in the south and southwest of Hamedan
36
48
FA
M.H.
Ghobadi
amirghobadi@yahoo.com
S.
Mousavi
sajed_ms@yahoo.com
This paper analyzes the characteristics and instability of the hillslopes on the hornfelsic residual soils in south and southwest Hamedan city based on field investigations and various labratory tests. For this purpose, the limit equilibrium analyses are performed to determine the factor of safety and sensitive analysis against slope failure of residual soil slopes. The sensitivity and stability analyses with respect to varying slope angles, shearing strength parameters, and thicknesses of saturated residual soil were performed. The results indicated that the southwest parts of Hamedan have high potentiality of translational slide even in 30 to 60 % saturation of soil layer depending on the slope angles and vertical depth of the soil. In this area, the threshold slope angles to failure vary between 23.5 to 41 degree. The remediation measurements in order to decrease the possible damages are recommended.
landslide,Hamedan,Hornfelsic residual soils,Slope stability,Sensitive analysis
https://nfag.basu.ac.ir/article_557.html
https://nfag.basu.ac.ir/article_557_48227074a0d9bd557074011bb059e00f.pdf
Bu-Ali Sina University
New Findings in
Applied Geology
2228-5873
2981-0264
7
14
2014
02
20
Biostratigraphy of the basal part of the Dalan Formation at Chal-I-Sheh
section, High Zagros
49
57
FA
S.
Arefi Fard
sarefi@hotmail.com
The lower part of the Dalan Formation in Chali-I-Sheh section, High Zagros has been studied in regard to foraminiferal fauna composition. It composed of alternated sandstone and limestone in the lowermost portion and grade chiefly into carbonate upward. These carbonates contain low diversity of small foraminifers and small fusulinids that do not yield an age older than Guadalupian. It can be assumed that the deposition of Dalan Formation in this section was slightly later than that of Il-e Beyk section in Zard Kuh area. Although Lithologic changes at the base of the Dalan Formation in the Chal-I-Sheh section is transitional, but the lack of diagnostic Kubergandian foraminifera is indicative of a greater hiatus at the lower part of the Dalan Formation in the Chalish-I-Sheh section compared with Il-e Beyk section in the Zard Kuh area.
Biostratigraphy,Dalan Formation,Chal-I-Sheh Section,high Zagros
https://nfag.basu.ac.ir/article_558.html
https://nfag.basu.ac.ir/article_558_fcbce6482f1d030dab9bb5a03db45f29.pdf
Bu-Ali Sina University
New Findings in
Applied Geology
2228-5873
2981-0264
7
14
2014
02
20
Tectonomagmaic evolution of intrusions from the Northeastern Qori, Southwestern Shahr-e-Babak, south Sanandaj-Sirjan zone
58
73
FA
A.
Fazlnia
qfazlnia@yahoo.com
Beginning of the Neotethys subduction beneath the south Sanandaj-Sirjan zone caused development a regional metamorphism in rocks from the southwest Shahr-e-Babak at 187 Ma (Qori complex). Continue of the subduction under the zone led to be metasomatized mantle wedge and melted the wedge at 173-170 Ma. As a result of the process, the formation of tholoiitic basic magma, injection of the magma into the base of the continental crust, fractionation of the melt, partial melting of the base of the alumina-rich continental crust and contamination of the magma with the continental crust occurred. These processes were formed the Talle-Pahlevani (mafic-ultramafi intrusion) and Chah-Bazargan (quartz diorite-anorthosite) complexes. Increasing of contamination in these melts during their injection into the middle crust caused to be formed highly contaminated parts in the Chah-Bazargan complex. Then, subduction of the mid ocean ridge of Neotethys beneath the Sanandaj - Sirjan zone caused to be formed an arc-related regional metamorphism at 149-145 Ma.
Qori complex,Talle-Pahlevani complex,Chah-Bazargan complex,mafic-ultramafic,anorthosit
https://nfag.basu.ac.ir/article_559.html
https://nfag.basu.ac.ir/article_559_ff49fb19edd670fcb689c64778e21fc1.pdf
Bu-Ali Sina University
New Findings in
Applied Geology
2228-5873
2981-0264
7
14
2014
02
20
The study of Re content and crystal structure of molybdenites from Sar Cheshmeh deposit, and comparison with other porphyry deposits of the world
74
80
FA
B.
Aminzadeh
aminzadeh85@gmail.com
The Re content was determined in monomineralic molybdenite separates from veinlets. Mineralogical data and chemical analyses indicate two generations of veinlet molybdenites in the Sar Cheshmeh deposit. The first generation (molybdenite I) which contains low Re, is found as intergrowth with quartz, small grain size, and the second generation (molybdenite II) which contains high Re, is found in veinlets with low quartz content. There is a positive correlation between the elevation of molybdenite deposition and Re content in molybdenite samples from the Sar Cheshmeh deposit. Decrease in the temperature and pH of the hydrothermal fluids are effective for the accumulation Re in molybdenite. XRD study of molybdenite samples indicate that the molybdenites (high and low Re) are of the 2H polytype. The Re concentration in Sar Cheshmeh deposit was compared with other porphyry deposits worldwide.
Re,Molybdenite Sar Cheshmeh,porphyry Cu deposit,Iran
https://nfag.basu.ac.ir/article_560.html
https://nfag.basu.ac.ir/article_560_19c9a919580e1704d41a60208619a82d.pdf
Bu-Ali Sina University
New Findings in
Applied Geology
2228-5873
2981-0264
7
14
2014
02
20
Palaeoecology of upper Cretaceous solitary corals, Kermanshah
81
88
FA
R.
Gravand
rgravand@gmail.com
F.
Amir Hasan Khani
The upper cretaceous rocks that are exposed in the Kermanshah area rich in rudist, larger foraminifera and corals. Discoid morphotypes of connolitid corals prevailed during the Tarbur Formation .The absence of costasepta at the basal part of cunnolitid corals shows they were immobile during life and lie freely on the soft substrate. Rudists become the dominant fauna whereas corals disappear. Absence of corals in upper parts of sequence is due to variations in amounts of nutrients. Based on biostratigraphy, <em>Omphalocyclus-Loftusia</em> assemblage zone, was identified. <br />
Kermanshah,Coral,Tarbur,Rudist
https://nfag.basu.ac.ir/article_561.html
https://nfag.basu.ac.ir/article_561_3eaa4ccf7437967b021ec6f97ad63d81.pdf