Pezhman Rasekh | Isfahan University of Technology (original) (raw)

Papers by Pezhman Rasekh

Kahang porphyry copper deposit lies in the central part of Urumieh-Dokhtar magmatic belt which is... more Kahang porphyry copper deposit lies in the central part of Urumieh-Dokhtar magmatic belt which is the main volcanic belt of Iran. The porphyry phases of the complex consist of a diorite porphyry, quartz monzonite and a dacite porphyry phase associating with tourmaline-bearing quartz veins. Electron microprobe analysis indicated that the tourmalines from quartz veins display schorl-dravite solid solution. Plotting of chemical data in Ca-X site–vacancy-Na+(K) ternary diagram, it is found that the tourmalines are categorized as alkali group. The studied tourmalines are plotted in (R+R) versus R diagram which show that most of the tourmaline samples reflect extent of substitution toward proton-deficient. According to Al-Fe(tot)-Mg and Ca-Fe(tot)-Mg diagrams, the tourmalines from the quartz veins are related to ferric iron-rich quartz–tourmaline rocks, calc-silicate rocks, and metapelites, as well as, Ca-poor metapelites and metapsammites. Considering the petrographic observation and geo...

Kahang porphyry copper deposit is located in Isfahan Province, in the middle of the Urmia-Dokhtar... more Kahang porphyry copper deposit is located in Isfahan Province, in the middle of the Urmia-Dokhtar magmatic belt. This deposit is the first porphyry deposit explored in this part of the belt, and for exploration in similar or adjacent localities, it is very important to accurately understand how it has been formed. Formation of various types of quartz veins-veinlets in porphyry systems, is associated with characteristic ore mineralization and wall-rock alteration, and their study helps to understand Magmatic-Hydrothermal evolution of the system. Veins and breccias diversity in Kahang porphyry deposit is unique. This deposit has suffered different magmatic activities that has led to the formation of 6 main groups of veins and breccias, including: EB and M Type veins and breccias; A Type veins; B Type veins and breccias; P Type veins and breccias; D Type veins; T Type veins and breccias; and L Type veins and breccias. Dacite stock formed A2 Type veins that are the most abundant vein ty...

As many other sciences in the world, geological studies specially in preparing geological and exp... more As many other sciences in the world, geological studies specially in preparing geological and exploratory maps which are the main bases of these studies, are changing. According to development of hardware and software technologies, human being are facing with new possibilities in the field of scientific and practical methods. For long time, the usage of aerial photographs in black and white was considered as an indispensable tool in preparing maps. with the appearance of a variety of satellite photographs with higher resolution, they were replaced by previous data; but this procedure is very slow in our country. this situation exists in geology education by another means, so that, there is traditional methods of teaching by aerial photographs in black and white with or without satellite data in the universities. Such a situation might be the result of leakage of updated data or methods which used by geologists. Moreover, the recent data, requires a specialized field in remote sensin...

In geologic perspective, the Chahmir mine is in the limestone and lime_ dolomite stone. The type ... more In geologic perspective, the Chahmir mine is in the limestone and lime_ dolomite stone. The type of this deposit is SEDEX. In this area hydrothermal solution put the mineral on joints and fractures of limestone and lime_ dolomite stone. Therefore this is a good exploration key for recognition of this type deposit. In this article the remote sensing and tectonic scrutiny of mine result a good points for mineralization.

ABSTRACT Kahang porphyry copper deposit is located in Isfahan Province, in the middle of the Urmi... more ABSTRACT Kahang porphyry copper deposit is located in Isfahan Province, in the middle of the Urmia-Dokhtar magmatic belt. This deposit is the first porphyry deposit explored in this part of the belt, and for exploration in similar or adjacent localities, it is very important to accurately understand how it has been formed. Formation of various types of quartz veins-veinlets in porphyry systems, is associated with characteristic ore mineralization and wall-rock alteration, and their study helps to understand Magmatic-Hydrothermal evolution of the system. Veins and breccias diversity in Kahang porphyry deposit is unique. This deposit has suffered different magmatic activities that has led to the formation of 6 main groups of veins and breccias, including: EB and M Type veins and breccias; A Type veins; B Type veins and breccias; P Type veins and breccias; D Type veins; T Type veins and breccias; and L Type veins and breccias. Dacite stock formed A2 Type veins that are the most abundan...

Kuh-Panj porphyry Cu mineralization is located at 20 km from SouthEastern of Sarcheshmeh mine in ... more Kuh-Panj porphyry Cu mineralization is located at 20 km from SouthEastern of Sarcheshmeh mine in Kerman province, within the Urmieh–Dokhtar magmatic belt. Considering compositional nature of geochemical data, it is essential to apply appropriate logratio techniques prior to accomplish statistical processes. This study aimes at end-member analysis of the litogeochemical data acquiring principal factor analysis (PFA) and singular value decomposition (SVD) techniques. The extracted endmembers of aforementioned statistical methods are then alr-transformed to determine the Range Correlation Coefficient (RCC) which best characterizes the copper mineralized zones of Kuh-Panj exploration area.

In this paper, integrating resistivity and microgravity data has been used due to identify the lo... more In this paper, integrating resistivity and microgravity data has been used due to identify the location of underground canals and cavities. Exploration of subsurface cavities and canals can be done by such data. The next step toward identification of underground canals would be virtualizing the space by importing resistivity and microgravity data to Model vision Software. By using such an integrating method we can detect underground spaces with more accuracy.

The first objective of this geophysical surveying is to delineate the potential of some buried co... more The first objective of this geophysical surveying is to delineate the potential of some buried conductive objects by electromagnetic, VLF and IP/RS geophysical surveying in Isfahan University of Technology's geophysical site which is located just next to faculty of mining engineering. We are supposed to interpret whole the geophysical aspects of this site, process the obtained geophysical data and finally, propose the probable locations and shapes of the buried anomalies.

Nowadays, it is very common to use drilling methods in industry. Diverse factors which are almost... more Nowadays, it is very common to use drilling methods in industry. Diverse factors which are almost come from the intact rock properties or the drilling machine, may cause some changes in the drilling procedure and consequently its rate of penetration. Rock's physical properties and joints information are the factors of a formation which are somehow influencing on the speed of drilling procedure. In this article it is going to illustrate how the mentioned factors are going to affect the drilling procedure.

Kahang porphyry copper deposit lies in the central part of Urumieh-Dokhtar magmatic belt which is... more Kahang porphyry copper deposit lies in the central part of Urumieh-Dokhtar magmatic belt which is the main volcanic belt of Iran. The porphyry phases of the complex consist of a diorite porphyry, quartz monzonite and a dacite porphyry phase associating with tourmaline-bearing quartz veins. Electron microprobe analysis indicated that the tourmalines from quartz veins display schorl-dravite solid solution. Plotting of chemical data in Ca-X site–vacancy-Na+(K) ternary diagram, it is found that the tourmalines are categorized as alkali group. The studied tourmalines are plotted in (R 1+ +R 2+) versus R 3+ diagram which show that most of the tourmaline samples reflect extent of substitution toward proton-deficient. According to Al-Fe(tot)-Mg and Ca-Fe(tot)-Mg diagrams, the tourmalines from the quartz veins are related to ferric iron-rich quartz–tourmaline rocks, calc-silicate rocks, and metapelites, as well as, Ca-poor metapelites and metapsammites. Considering the petrographic observation and geochemical investigations, the tourmalines of the Kahang area are classified as hydrothermal origin. BSE image and chemical zoning of this mineral confirm its hydrothermal origin. The tourmalines from quartz veins, with average Fe # values of 0.58 (Fe # <0.6) are represented as distal.

Kajan area is located in east of Isfahan, within the Urmia-Dokhtar volcanic belt. The volcanic ro... more Kajan area is located in east of Isfahan, within the Urmia-Dokhtar volcanic belt. The volcanic rocks of the area are mostly associated with the Tertiary volcanic activities. The current study is carried out to identify new promising targets for regional exploration. Multiple data sources (e.g., stream sediment geochemical data, magnetic surveys, faults, geological and satellite data) are processed and then integrated by using Fuzzy Logic modeling to produce a final favorability map for regional copper exploration in the Kajan area. Introduction Predictive prospectivity mapping is used to define favorable areas for mineral exploration (Rasekh et al, 2013). This method can be applied in various scales from global to local scale exploration targeting. Definition of the exploration model is based on mineralization model. This gives the framework for initializing a predictive mineralization targeting. In this research we first processed different exploration data set such as geological map at the scale of 1:1000000, stream sediment geochemistry, airborne magnetics, structural map and Aster satellite data to identify special proxies related to copper mineralization. Then the results were integrated by fuzzy logic data integration method to create a final potential map for regional copper exploration. Figure 1 shows the location map of the Kajan area at the Urumiye-Dokhtar volcanic belt and also the 1:1000000 geological map of the area.

Kahang copper porphyry deposit is located in Isfahan Province, in the middle of the Urmia-Dokhtar... more Kahang copper porphyry deposit is located in Isfahan Province, in the middle of the Urmia-Dokhtar magmatic belt. This deposit is the first porphyry deposit explored in this part of the belt, and for exploration in similar or adjacent localities, it is very important to accurately understand how it has been formed. Formation of various types of quartz veins-veinlets in porphyry systems, is associated with characteristic ore mineralization and wall-rock alteration, and their study helps to understand Magmatic-Hydrothermal evolution of the system. Veins and breccias diversity in Kahang porphyry deposit is unique. This deposit has suffered different magmatic activities that has lead to the formation of 6 main groups of veins and breccias, including: EB and M Type veins and breccias; A Type veins; B Type veins and breccias; P Type veins and breccias; D Type veins; T Type veins and breccias; and L Type veins and breccias. Dacite stock formed A2 Type veins that are the most abundant vein type and accompanied by mineralization.

"As many other sciences in the world, geological studies specially in preparing geological and ex... more "As many other sciences in the world, geological studies specially in preparing geological and exploratory maps which are the main bases of these studies, are changing.
According to development of hardware and software technologies, human being are facing with new possibilities in the field of scientific and practical methods.
In this essay, in order to reduce the existing problems Google Earth is introduced as a technic. this software is capable for a lot of skills and can be useful for the users who don’t have high level of skills and it’s not necessary to be an expert in the field of remote sensing and GIS software. some of the main features of this software are: 1)The usage of updated satellite data(in some versions you can select the images according to the date they are captured); 2) Editing and drawing geometric figures(points, lines and polyhedral); 3) Combination of satellite data and a DEM simultaneously or separately; 4) Possibility of adding data layers (geo-referenced) software; 5) Observe the spatial data of land in different directions; 6) Exports of the different parts of the shown data; 7) Sharing data, land and descriptive information; 8) Ease of use for users with minimal computer skills; 9) Geometric measurements in different directions; 10)Connection of GPS to the software; 11)Searching; 12) Using the software, and storage requirements without an Internet connection; 13) Taking image from any part of the land surface of interest with / without information layers; 14) Gathering descriptive information and images (still and moving) and side regions of interest (if exists); 15) having the map of the desired area by using Google Maps; 16) Simplify the process of preparing geological maps; 17) ability of connecting every point on earth with the related sheet of geological maps in different scales."

In geologic perspective, the Chahmir mine is in the limestone and lime_ dolomite stone. The typ... more In geologic perspective, the Chahmir mine is in the limestone and lime_ dolomite stone.
The type of this deposit is SEDEX. In this area hydrothermal solution put the mineral on
joints and fractures of limestone and lime_ dolomite stone. Therefore this is a good
exploration key for recognition of this type deposit. In this project the remote sensing
and tectonic scrutiny of mine result a good points for mineralization.

Kahang porphyry copper deposit lies in the central part of Urumieh-Dokhtar magmatic belt which is... more Kahang porphyry copper deposit lies in the central part of Urumieh-Dokhtar magmatic belt which is the main volcanic belt of Iran. The porphyry phases of the complex consist of a diorite porphyry, quartz monzonite and a dacite porphyry phase associating with tourmaline-bearing quartz veins. Electron microprobe analysis indicated that the tourmalines from quartz veins display schorl-dravite solid solution. Plotting of chemical data in Ca-X site–vacancy-Na+(K) ternary diagram, it is found that the tourmalines are categorized as alkali group. The studied tourmalines are plotted in (R 1+ +R 2+) versus R 3+ diagram which show that most of the tourmaline samples reflect extent of substitution toward proton-deficient. According to Al-Fe(tot)-Mg and Ca-Fe(tot)-Mg diagrams, the tourmalines from the quartz veins are related to ferric iron-rich quartz–tourmaline rocks, calc-silicate rocks, and metapelites, as well as, Ca-poor metapelites and metapsammites. Considering the petrographic observation and geochemical investigations, the tourmalines of the Kahang area are classified as hydrothermal origin. BSE image and chemical zoning of this mineral confirm its hydrothermal origin. The tourmalines from quartz veins, with average Fe # values of 0.58 (Fe # <0.6) are represented as distal.