6 results on '"Reza Jafari, Mohammad"'
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2. Economic Geology, Petrology and Environmental of Copper Ore Deposits of Chagho in South West Karaj
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Rakhshani Moghadam, Alireza, Lotfi, Mohammad, Reza Jafari, Mohammad, Ashja Ardalan, Afshin, Pour Moghaddam, Majid, Yazdi, Abdollah, Rakhshani Moghadam, Alireza, Lotfi, Mohammad, Reza Jafari, Mohammad, Ashja Ardalan, Afshin, Pour Moghaddam, Majid, and Yazdi, Abdollah
- Abstract
The mineral zone under study is 32 square kilometers located in Chagho village, Akhtarabad village, Malard county, Shahriar city, Tehran province. This area is part of the Urumieh-Dokhtar Volcanic Belt. The age of the studied rocks is related to the Eocene and younger than the Eocene. The downward trend of some oxides of major elements such as MgO, CaO and AL2O3 and the increasing trend of K2O and Na2O over SiO2 from the basaltic rocks to the intermediate-acidic rocks in rocks of the studied area are consistent with the magmatic subduction process. Based on standardized radar charts relative to chondrite of the rocks under study, enrichment of elements (LILE) such as Cs, Rb, Ba and light rare earth elements (LREE) relative to HFS elements (Ti, Nb) and heavy rare earth elements (HREE) (Y, Yb, Lu) is shown. In all of the rocks mentioned above, the element u is enriched relative to the primary mantle. The positive anomaly of this element may indicate contamination of their constituent melts with the upper crust. In all studied rocks, HFS elements such as Ti, Nb show depletion and concave pattern. The depletion of the aforementioned elements to the primary mantle may be attributed to the contamination of the melts with lower and upper crustal or possibly the dependence of the melts constituting these rocks on the geodynamic environments of subduction of Neo-Tethyan. According to the study of fluids involved in the region, the temperature of homogenization with the temperature of formation of copper veins is between 120 and 306 ° C, and the salinity percentage varies from 6.45 to 15.96 wt% of sodium chloride. Accordingly, this ore deposit is classified as mesothermal and is a type of hydrothermal allogenic deposits, the presence of sub-faults and seams and gaps in the host rock as a low-pressure environment has provided a suitable site for vein-type mineralization
- Published
- 2021
3. Detecting the potential lead, zinc, and gold orebodies by integrating remote sensing, geochemical, and geophysical studies in Dehshir (Iran)
- Author
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Ahmadi, Faezeh, primary, Reza Jafari, Mohammad, primary, Adib, Ahmad, primary, Hrati, Hamid, primary, and Ali Arian, Mohammad, primary
- Published
- 2021
- Full Text
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4. APPLICATION OF FRACTAL MODELING BASED ON REMOTE SENSING DATA FOR DETECTING IRON MINERALIZATION IN DEHSHIR–BAFT FAULT, WEST OF CENTRAL IRAN
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Ahmadi, Faezeh, Reza Jafari, Mohammad, Adib, Ahmad, Hrati, Hamid, and Ali Arian, Mohammad
- Abstract
Part of Dehshir–Baft Fault is located on the 1:100000 Sarvbala geological sheet west of Yazd Province in Iran on the Urmia–Dokhtar magmatic–mineralization zone. Regions with iron mineralization potential on this sheet were detected by identifying alterations and fault trends by processing ASTER satellite images. Images were processed using the false color composite (FCC), Crosta, LS-Fit, and spectral angle mapper (SAM) methods to identify iron oxide, argillic, propylitic, and phyllic alterations. To find out the role of faults and lineaments in mineralization, the general faulting trend on this sheet was extracted by relief shading on the digital elevation model (DEM), and the fault zones were examined through field operations. Regions with high iron potential were identified by integrating the fault layers, alterations, and mineralization-related geological units in ArcGIS. The identified regions were then validated through field operations. The relationship between the distance of iron oxide alterations obtained from the LS-Fit method with the main fault was evaluated by the fractal method. The results showed the location and more significant relationship of iron potential with faults in the south and southwest of Sarvbala sheet than other regions., Parte da falha de Dehshir – Baft está localizada na folha geológica Sarvbala 1: 100.000 a oeste da província de Yazd, no Irã, na zona de mineração magmática Urmia – Dokhtar. A pesquisa conduzida buscou indetificar regiões com potencial de mineração de ferro nesta folha a partir da detecção e identificação de alterações e tendências de falha pelo processamento de imagens de satélite do instrumento ASTER. As imagens foram processadas usando os métodos de composição falsa cor (FCC), Crosta, LS-Fit e mapemaneto de ângulo espectral (SAM) para identificar alterações de óxido de ferro, argílico, propilítico e fílico na área. Para descobrir o papel das falhas e lineamentos na mineração, a tendência geral de falhas nesta folha foram obtidas com a elaboração do sombreamento do relevo no Modelo Digital de Elevação (DEM), e as zonas de falha foram examinadas por meio de verificações de campo. Regiões com alto potencial de ferro foram identificadas através da integração das camadas de falha, alterações e unidades geológicas relacionadas à mineração com o uso do programa ArcGIS. As regiões identificadas foram então validadas in loco. A relação entre a distância das alterações do óxido de ferro obtida pelo método LS-Fit com a falha principal foi avaliada pelo método fractal. Os resultados mostraram a localização e a relação mais significativa do potencial de ferro com as falhas no sul e sudoeste da folha do mapa geológico de Sarvbala do que em outras regiões.
- Published
- 2020
5. Petrografía y geoquímica de magmas intrusivos en Varmaqan - Sardare ghobadi en el oeste de Irán
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Davari, Negin, Arian, Mohammad Ali, Ashja Ardalan, Afshin, Reza Jafari, Mohammad, Davari, Negin, Arian, Mohammad Ali, Ashja Ardalan, Afshin, and Reza Jafari, Mohammad
- Abstract
The study area is a quadrilateral of 155 km2 between eastern longitude 47˚ and 40 ′ to 47˚ and 52 ′ and northern latitudes 35˚ and 00 ′ to 35˚ and 04 ′ that is located in west of Iran, north of Sonqor city and between Varmaqan and Sardare Ghobadi villages of Kermanshah province. In this range, the intrusive rocks are alkaline granite, granite, granodiorite, tonalite, quartz alkaline syenite, quartz monzonite, quartz monzodiorite, quartz diorite, alkaline syenite, monzonite, diorite, gabbro diorite, gabbro, and olivine gabbro as they were injected in the iron ores of cretaceous which has resulted in contact metamorphism and created hornfels at the site of contact. After comprehensive sampling of all required igneous rocks and according to the thesis objectives, thin sections were prepared and after petrography and some samples were selected for geochemical experiments. XRF analysis, ICP and alkaline fusion were performed on some samples. According to geochemical and petrological studies, the magmas forming these intrusive igneous rocks are from one region and because of magmatic differentiation or fractional crystallization, they from basaltic to acidic terms. Samples of this quadrilateral have a metaalumina nature and granitoids are in the range of arc islands granites, continental arc granitoids and continental collision granitoids. The mineralogical and chemical composition of the acidic rocks in the area show that the granites in this study are type I., El área de estudio es un cuadrilátero de 155 km² entre la longitud oriental 47 ° y 40 'a 47 ° y 52' y las latitudes norte 35 ° y 00 'a 35 ° y 04' que se encuentra al oeste de Irán, al norte de la ciudad de Sonqor y entre las aldeas Varmaqan y Sardare Ghobadi de la provincia de Kermanshah. En este rango, las rocas intrusivas son granito alcalino, granito, granodiorita, tonalita, sienita alcalina de cuarzo, monzonita de cuarzo, monzodiorita de cuarzo, diorita de cuarzo, sienita alcalina, monzonita, diorita, diorita de gabro, gabro y gabro de olivina cuando se inyectaron. los minerales de hierro del cretáceo que han resultado en metamorfismo de contacto y creado hornfels en el sitio de contacto. Después del muestreo exhaustivo de todas las rocas ígneas requeridas y de acuerdo con los objetivos de la tesis, se prepararon secciones delgadas y después de la petrografía y se seleccionaron algunas muestras para experimentos geoquímicos. Análisis de XRF, ICP y fusión alcalina se realizaron en algunas muestras. De acuerdo con estudios geoquímicos y petrológicos, los magmas que forman estas rocas ígneas intrusivas son de región y, debido a la diferenciación magmática o cristalización fraccionada, pasan de términos basálticos a ácidos. Las muestras de este cuadrilátero tienen una naturaleza de meta-alúmina y los granitoides están en el rango de granitos de islas de arco, granitoides de arco continental y granitoides de colisión continentales. La composición mineralógica y química de las rocas ácidas en el área muestra que los granitos en este estudio son de tipo I.
- Published
- 2020
6. Petrography and geochemistry of intrusive magmas in Varmaqan – Sardare ghobadi in the west of Iran
- Author
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Davari, Negin, primary, Ali Arian, Mohammad, primary, Ashja Ardalan, Afshin, primary, and Reza Jafari, Mohammad, primary
- Published
- 2020
- Full Text
- View/download PDF
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