Petrology and Geochemistry of seyenitic and gabbroic intrusive rocks in the north of Esphordi Phosphate mine (NE Bafq)
میر علی اصغر
مختاری
دانشگاه زنجان
author
محمد
ابراهیمی
دانشگاه زنجان
author
بیتا
جاوید فخر
دانشگاه زنجان
author
سیده طاهره
نبوی شقاقی
دانشگاه زنجان
author
text
article
2016
per
Abstract
The studied area is located at the 30 km northeast of the Bafq city and near the Esphordi phosphate mine. This area composed of Rizu Series rock sequence with Upper Precambrian- Lower Cambrian age. The mentioned sequence has been intruded by some seyenitic and gabbroic intrusions. Petrographical studies indicate that syenites contain hetero- granular, perthite and checkerboard textures and composed of alkali- feldspar (orthoclase), plagioclase, amphibole, pyroxene and biotite. Gabbros contain hetero- granular, and inter- granular textures, and composed of plagioclase, clinopyroxene, amphibole and biotite. Geochemical studies demonstrate that syenites and gabbros have high- K to shoshonitic alkaline nature. Based on the spider diagrams, the two mentioned intrusion have similar trend which can be indicative for their genetic relation. These diagrams indicate enriched LILEs along with negative anomalies of HFSEs. The chondrite normalized REE patterns demonstrate LREEs rich pattern with high ratio of LREE/HREE. The mentioned trends along with positive and negative anomalies of those elements probably are related to lower partial melting degrees of metasomatized mantle along with crustal contamination of this magma. Based on geochemical studies and using the discrimination tectonic setting diagrams, it seems that the studied intrusions were formed at the active continental margins toward post- collisional setting.
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
4
no.
2016
1
21
https://esrj.sbu.ac.ir/article_96092_5f971d03839f93c887ee7136bdc126ac.pdf
Comparing Neural Networks with Data Mining techniques to simulate Cu; case study: Parkam Kerman
سید سعید
قنادپور
دانشگاه صنعتی امیرکبیر
author
اردشیر
هزارخانی
دانشگاه صنعتی امیرکبیر
author
ترانه
رودپیما
دانشگاه صنعتی امیرکبیر
author
text
article
2016
per
Data analysis helps us to understand how we should achieve the expected results, so as to achieve more accurate processes, it is necessary to choose an analyzing method that is the best one for our subject. In order to analyze surface samples of Parkam district based on four values of longitude and latitude of sampling points and grades of copper and Molybdenum, we use the three useful method of K-Nearest Neighbor (KNN), K-Means and Neural Networks. One of the important viewpoints in data mining to analyze and investigate high volume of data and samples with different characteristics is clustering viewpoint that itself include different methods and techniques. One of the most famous algorithms of clustering is KNN algorithm to estimate according to the training examples. In fact, it is a non-parametric method used for classification and regression in order to reach relationships among variables while K-Means algorithm tries to divide data in K clusters based on a distance criterion. Neural networks can be useful tools in pattern recognition while there is not much information available for interpretation. In present study, to simulate and estimate copper grade in porphyry copper system of Parkam located in Kerman province, different learning algorithms that are mentioned are compared and results are shown. In this paper, comparing the results of the three algorithms is our target to pave the way of researchers. The results show that KNN has more correlation in contrast of neural networks and K-Means so using KNN can be more effective to estimate copper grade. The advantage of using KNN method relative to other estimation methods in present study is providing a specified and accurate pattern for decision makers in industry to estimate grade.
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
4
no.
2016
22
36
https://esrj.sbu.ac.ir/article_96122_6d7fa0fc0e9a2487c51723d975f25b06.pdf
Microfacies and depositional model of the Qom Formation in the Khurabad area (southeastern Qom)
ابراهیم
محمدی
کرمان، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، پژوهشگاه علوم، گروه اکولوژی
author
حامد
عامری
emohammadi02@gmail.com
author
text
article
2016
per
Deposition of the Qom Formation took place in three NW–SE-trending basins: Sanandaj–Sirjan fore-arc basin, Urumieh–Dokhtar intra-arc basin and Central Iran back-arc basin. The Qom Formation deposits in southeastern Qom have been sampled and studied in order to study the microfacies and their depositional conditions. Outcrops of the Qom Formation in the study area, with 260-m thickness, consist mainly of medium to thick bedded and massive limestones, marly limestone, marl, evaporate deposits and siliciclastic deposits (siltstone, sandstone, congelomerate). Study section is unconformably underlain by the Eocene volcanic rocks and overlain by the Upper Red Formation (URF). On the basis of recognized foraminifera and their vertical distribution, the Qom Formation is Rupelian-Burdigalian in age in the study area. Fourteen microfacies were recognized based on field investigations and microscopic studies. Based on recognized microfacies and field investigations and absence of reefal, oolitic and bioclastic barriers, the Qom Formation in southeastern Qom deposited on an open shelf. This shelf, is generally dividable into two depositional environments including inner shlf (lagoon) and middle shelf (open marine). However, outer shelf deposites which is characterized by the presence of planktonic foraminifera and/or light-independent, heterotroph organisms, as well as absence of larger benthic foraminifera are not observed in the study area.
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
4
no.
2016
37
58
https://esrj.sbu.ac.ir/article_96130_ec11e4eb31860a76bc6c8d51e12a5761.pdf
Geometric and kinetic analysis Zeloi Anticline in the northern part of Dezful Embayment, SW Iran
بهزاد
دریکوند
دانشگاه شهید بهشتی
author
سید احمد
علوی
دانشگاه شهید بهشتی
author
حسین
حاجی علی بیگی
دانشگاه شهید بهشتی
author
ایرج
عبداللهیفرد
اداره ژئوفیزیک مدیریت اکتشاف، شرکت ملی نفت ایران
author
text
article
2016
per
Dezful Embayment in the central part of Zagros fold-thrust belt includes numerous oil fields. Zeloi Anticline in the north of this Embayment displays various geometry in different parts. Geometric and kinetic analysis of Zeloi Anticline is done using five seismic profiles almost perpendicular to the axis of the anticline. Aspect ratio parameter (R) suggests wide and broad words for Zeloi Anticline. Distribution of curvature on limb parameter (L) of this anticline is in range of 0.17≤ L ≤0.7. According to the stratigraphical column, Gachsaran Formation as upper detachment horizon and Kalhor member with Pabdeh and Gurpi Formations and Garua-Dashtak Formations have been involved as local and intermediate detachment horizons in deformation of Zeloi Anticline, respectively. This anticline exhibits geometry similar to the detachment folds, fault-propagation fold, pop-up structures and shear fault-bend fold in different parts. Because of the Garua-Dashtak detachment horizon existence in the area and since in the some seismic profiles Zeloi Anticline is a detachment fold, this anticline is analyzed as a faulted-detachment fold in central and south-eastern plunge and as an intermediate geometry between detachment fold and shear fault-bend fold in the northwest plunge.
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
4
no.
2016
59
81
https://esrj.sbu.ac.ir/article_96142_abef1204bf23f57bde1e766cb80534ac.pdf
Comparison of Transect-from-baseline and The Change Polygon Methods in the survey of the coastline Changes (case study: Chalus Delta) base
قاسم
لرستانی
دانشگاه مازندران
author
text
article
2016
per
Direct and indirect effects of hydrodynamic processes of land and sea, Cause great changes in the coastline geometry. The study of these changes can be very useful for planning sustainable coastal environments. The aim of this study, was to compare Transect-from-baseline and the Change Polygon methods in the survey of the coastline Changes in Chalus Delta base. Materials used to achieve the objectives of this research, are TM and ETM images of Landsat Satellite in 1988 and 2000 years and SPOT image in 2015. The work is based on measuring of changes rate in the coastline between the two time periods by using both Transect-from-baseline and The Change Polygon methods. This study shows that in Transect-from-baseline method, how to select the baseline, high rotation coastline in some coastal areas and indentations or protrusions large areas of coastline will have a huge impact on results. but in polygon changes, due to measuring changes occurring between the two shorelines, results obtained are based on the parameters measured the position of the coastline. so the Change Polygon method is show more scientific credibility than the Transect-from-baseline method
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
4
no.
2016
82
95
https://esrj.sbu.ac.ir/article_96150_d833330e85da5cc3472c01eda3978f88.pdf
Temperature-precipitation equilibrium-line altitude (TP-ELA) and temperature-precipitation- wind equilibrium-line altitude (TPW-ELA) in High Zagros
بابک
ابراهیمی
وزارت نیرو - شرکت آب منطقه ای اصفهان
author
عبداله
سیف
دانشگاه اصفهان - دانشکده برنامه ریزی و علوم جغرافیائی
author
text
article
2016
per
The equilibrium-line altitude (ELA) is generally dependent on the accumulation of snow which is influenced by the regional distribution of snow precipitation and local redistribution of snow by wind. Due to the effect of wind-blown snow on ELAs, the terms temperature-precipitation equilibrium-line altitude (TP-ELA) and temperature-precipitation wind equilibrium-line altitude (TPW-ELA) is introduced to distinguish between glacier ELAs reflecting the general winter precipitation and ablation season temperature in a region and glacier ELAs that are influenced by either snow deflation or accumulation (such as on cirque glaciers). In this study the TP-ELA in presently glaciated (Zardkuh and Oshtorankuh) and non-glaciated (Dena, Garein and Shahoo) areas is calculated. The altitude of small glaciers is also used to estimate the TPW-ELA. Based on this approach, regional climatic TP-ELA in Zardkuh, Oshtorankuh, Garein, Shahoo and Dena mountains is between 4400 to 4500 m a.s.l.(above main summits of the Zagros Mountains) TPW-ELA is around 3850 m a.s.l. in Zardkuh and Oshtorankuh Mountains which is 650 m lower than the regional TP-ELA. The present small glaciers in Zardkuh and Oshtorankuh are the result of leeward accumulation of wind-blown snow on small glacial cirques.
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
4
no.
2016
96
118
https://esrj.sbu.ac.ir/article_96155_9fee9b287f2c7b3b4617aa126aa33592.pdf
Analysis of Organizational Cohesion and Detection of key actors in the Sustainable Landscape management
مهدی
قربانی
دانشگاه تهران
author
حسینعلی
متولی
دانشگاه تهران
author
ساره
راسخی
دانشگاه تهران
author
لیلا
عوض پور
دانشگاه تهران
author
text
article
2016
per
Sustainable landscape management formed a hierarchical structure in Iran. That the scale is different at different levels. Various stakeholders at every level have important role for organizations and institutions on the one hand with both their scale and with other stakeholders in the organization linked to other levels. In order to achieve sustainable management of natural resources, water and soil in the areas need organizational participation of all stakeholders. As well as comprehensive management success depends on the organizational integration. This study is of the result project Iranian involvement and empowerment of local communities to approach social networks. The analysis of organizational cohesion and identify key actors in the sustainable landscape management in the Mahalat district of Markazi province. After the discovery of the problems facing the sustainable development of rural and participatory assessment to determine the participatory planning and implementation of policies at the prospect of 5 years, collaborative workshop for organizational stakeholders was held in the district level. In this context, the exchange of information and cooperation ties between stakeholders in organization using a macro-level factors among stakeholders the network and organizational capital were measured in two stages before and after ratification of the visions. Results indicate that the organizational cohesion and reciprocity index links the two legs of medium to heavy conditions improved as well during the first two stages of the centralization of decision-casting has been reduced. These results strengthen cross-sectoral relations towards land management and local sustainable development and decrease the concentration of decision-making and planning in order to achieve sustainable development are emphasized.
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
4
no.
2016
119
138
https://esrj.sbu.ac.ir/article_96102_cd265fa29f79e32affb90dbcee9af550.pdf
Determining Bankfull Discharge and Stream Power of Lighvan River based on Morphometric Characteristics of the Channel
سمیه
خالقی
دانشگاه شهید بهشتی
author
text
article
2016
per
Assessment of bankfull discharge and stream power is very important for the restoration and river management. Due to the high level of correlation with acceptable accuracy between morphometric characteristics of the channel and bankfull discharge so in this study, first, the morphometric parameters of the channel was measured through surveying of the 12 cross-section of the Lighvan River and then bankfull discharge, flow velocity, bed roughness coefficient were calculated by Manning equations and stream power and stream power per river width unit were estimated and finally peak discharge with different return periods was obtained to determine the return periods of bankfull discharge. The results showed that bankfull discharge was varied from 0.92 to 35.83 cubic meters per second and also stream power in the 12 cross-sections was varied ranged from 216.65 to 7374.27. The most bankfull discharge and stream power were related to cross section 9 and 2 that has been due to the connection of two branches of the river in the place of these cross sections and located of these two sections in residential area. Lighvan River energy to make changes was ranging from high (A) and medium (B). Also return periods of bankfull discharge was very varied due to changes in cross sections dimensions and its amount was not increasing trend from upstream to the downstream that shows effect of unnatural factors such as changes in vegetation and human interventions in the channel morphology of Lighvan River.
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
4
no.
2016
139
152
https://esrj.sbu.ac.ir/article_96111_8620cea9a5055d5f3de1591d286b1b74.pdf
Assessment of Coastal Vulnerability to Sea-Level Rise, Mazandaran Province
صدرالدین
متولی
استادیار گروه جغرافیا، دانشگاه آزاد اسلامی، واحد نور
author
محمد مهدی
حسین زاده
دانشیار گروه جغرافیای طبیعی، دانشکده علوم زمین، دانشگاه شهید بهشتی
author
خه بات
درفشی
دانشجوی دکتری ژئومورفولوژی، دانشکده علوم زمین، دانشگاه شهید بهشتی
author
text
article
2016
per
In the past 50 years, rising and falling of the Caspian Sea water level, as a part of its normal behavior, destroyed many of agricultural, residential and commercial lands. The current legal frontage of Caspian Sea is expressed buffer of 60 meters from the latest extended point of water level in 1342 based on the given definition in coastal law. According to Caspian Sea water level in the mentioned year (-27.66 meter), 88.87 percent of the Mazandaran province coastline is submerged within the area of this frontage. In this study, to achieve the vulnerability index of Mazandaran province coast area against sea water level fluctuation, five variables were used in two forms of natural and human origins. Regarding with the purpose of the study, the variables include ground elevation changes, slope, coastal landforms, land use and distance from the road. Determine the primary and secondary frontages in Mazandaran Province showed that in the area of 1389 shoreline to a level of -24.7 m (primary frontage), most areas is belonged to natural structures, agriculture and orchard lands. Natural structures have the most area with 8045 hectares which equivalent to 35.7 percent of the primary frontage area. In the secondary vertical frontage (elevation level of -24.7 to -23.5 meters), agricultural lands are dominant with 9644 hectares and have the most area in this front.
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
4
no.
2016
153
168
https://esrj.sbu.ac.ir/article_96121_9b053f7a308d0116a631c15277adf618.pdf