Petrologia e petrogênese do maciço intrusivo de SiahKuh no sul de KhoshYeilagh

SiahKuh is located in the NorthEastern part of Shahrood city and in the Eastern Alborz zone. The study of the area using geochemical models where 60 samples of intrusive rocks were used, allowed to determine that the petrological composition of the region consists of Gabbro, Monzodiorite, Syenite, Monzonite and Diorite. Plagioclase, Pyroxene and Olivine constitute the main minerals of Gabbro`s and Diorite`s. Granular, Intergranular and Optic texture are also observed. In the Syenite and Monzonite, Plagioclase, alkali feldspar and sometimes quartz, granular and variolite texture can be seen. Based on geochemical studies, the magma produced from the rocks to the intermediate calk alkaline with high potassium and the negative anomalies of Nb, Rb, P and the enrichment of the rocks of the region from rare earth elements (LRRE) and the high ratio of LREE/HREE represents spread of the crust and an indication of the presence of the Garnet phase in the mantle source. The initial basalt magma was created from a mantle with a composition of Lerzolite-Garnet with a melting point of 12-15%. Structure evidence suggests the formation of these rocks in the intercontinental rift. The formation of these rocks can be attributed to the effects of intercontinental tensile phases associated with deep fault during alpine orogenic phases in the time eocene.SiahKuh se encuentra en la parte noreste de la ciudad de Shahrood y en la zona oriental de Alborz. El estudio del área utilizando modelos geoquímicos donde se utilizaron 60 muestras de rocas intrusivas, permitió determinar que la composición petrológica de la región consiste en Gabbro, Monzodiorita, Sienita, Monzonita y Diorita. Plagioclasa. Piroxeno y olivino constituyen los principales minerales de Gabbro y Diorita. También se observan texturas granulares, intergranulares y ópticas. En la sienita y monzonita, se puede observar plagioclasa, feldespato alcalino y algunas veces cuarzo, granular y variolita. Con base en estudios geoquímicos, el magma produjo desde las rocas hasta la calca alcalina intermedia con potasio alto y las anomalías negativas de Nb, Rb, P y el enriquecimiento de las rocas de la región a partir de elementos de tierras raras (LRRE) y la alta proporción de LREE / HREE representa la propagación de la corteza y una indicación de la presencia de la fase Granate en la fuente del manto. El magma de basalto inicial se creó a partir de un manto con una composición de Lerzolite-Granate con un punto de fusión del 12-15%. La evidencia estructural sugiere la formación de estas rocas en la grieta intercontinental. La formación de estas rocas se puede atribuir a los efectos de las fases de tracción intercontinentales asociadas con fallas profundas durante las fases orogénicas alpinas en el tiempo del eoceno.SiahKuh está localizado na parte nordeste da cidade de Shahrood e na zona leste de Alborz. A área de estudo utilizando modelos geoquímico onde foram utilizadas 60 amostras rochas intrusivas, revelou que a região composição petrological consiste gabro, Monzodiorita, sienite, diorite .. Monzonite e plagioclase. Piroxena e olivina são os principais minerais de Gabro e Diorito. Texturas granulares, intergranulares e ópticas também são observadas. No sienito e monzonito, plagioclásio, feldspato alcalino e, às vezes, quartzo, granular e variolite podem ser observados. Com base em geoquímico, magma produzido a partir de rochas para alcalina calca alta potássio intermediário e anomalias negativas de Nb, Rb, P e enriquecimento das rochas na região a partir de elementos de terras raras (LRRE) e a alta proporção de LREE / HREE representa a propagação da crosta e uma indicação da presença da fase de granada na fonte do manto. Magma de basalto inicial foi criado a partir de um manto com uma composição de Lerzolite-Garnet com um ponto de fusão de 12-15%. Evidências estruturais sugerem a formação dessas rochas na fenda intercontinental. A formação dessas rochas pode ser atribuída aos efeitos das fases de tração intercontinental associadas a falhas profundas durante as fases orogênicas alpinas no período do Eoceno

Petrologia, geoquímica e petrogênese de unidades de rochas intrusivas de Varcheh, SE Arak, Irã.

The area covering south and southeast Arak toward north Khomein, there are several intrusive igneous rocks including gabbro and monzodiorite units. Intrusive units consists of gabbro to diorite. These intrusive units belong to tertiary period. Over 120 samples were collected from the outcrops and thin section studies and geochemical analysis were carried out as well. 14 samples have been sent for ICP and basic melt analysis for studying major and rare earth elements. The results are compiled by related software. As far as mineralogy is concerned, plagioclase, pyroxene (augite type) and orthoclase are the dominant minerals recognized in the samples. Petrological and mineralogical similarities among the studied samples may suggest a presence of a huge gabbro-diorite batholith between Arak and Khomein. The outcrops of this batholith can be seen in the studied area as a result of erosion. In the other word, some fingerprints of a huge batholite can be observed in the studied area.El área que cubre el sur y sureste de Arak hacia el norte de Jomein, hay varias rocas ígneas intrusivas que incluyen unidades de gabbro y monzodiorita. Las unidades intrusivas consisten en gabbro a diorita. Estas unidades intrusivas pertenecen al período terciario. Se recolectaron más de 120 muestras de los afloramientos y se realizaron estudios de sección delgada y también se realizaron análisis geoquímicos. Se enviaron 14 muestras para ICP y análisis de fusión básico para estudiar elementos de tierras mayores y raras. Los resultados son compilados por software relacionado. En cuanto a la mineralogía, plagioclasa, piroxeno (tipo augita) y ortoclasa son los minerales dominantes reconocidos en las muestras. Las similitudes petrológicas y mineralógicas entre las muestras estudiadas pueden sugerir la presencia de un enorme batolito de diorita gabbro entre Arak y Jomein. Los afloramientos de este batolito se pueden ver en el área estudiada como resultado de la erosión. En otras palabras, se pueden observar algunas huellas dactilares de una batolita enorme en el área estudiada.A área que cobre o sul e sudeste de Arak em direção ao norte de Khomein, existem várias rochas ígneas intrusivas, incluindo unidades de gabro e monzodiorito. Unidades intrusivas consistem de gabro para diorito. Essas unidades intrusivas pertencem ao período terciário. Mais de 120 amostras foram coletadas dos afloramentos e estudos de seção fina e análises geoquímicas também foram realizadas. 14 amostras foram enviadas para análise de ICP e fundição básica para estudar elementos de terras grandes e raras. Os resultados são compilados por software relacionado. Quanto à mineralogia, plagioclásio, piroxena (tipo augita) e ortoclásio são os minerais dominantes reconhecidos nas amostras. Semelhanças petrológicas e mineralógicas entre as amostras estudadas podem sugerir a presença de um enorme batólito de gabro-diorito entre Arak e Khomein. Os afloramentos deste batólito podem ser vistos na área estudada como resultado da erosão. Em outra palavra, algumas impressões digitais de um enorme batólito podem ser observadas na área estudada

Petrografía y geoquímica de magmas intrusivos en Varmaqan - Sardare ghobadi en el oeste de Irán

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 meta-alumina 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

GEOCHEMISTRY AND PETROGENESIS OF PLUTONIC MASSES IN NORTH OF SONQOR (WEST OF IRAN)

The study area is a quadrilateral that is in west of Iran and north of Sonqor city of Kermanshah province. This area is 155 km2 between eastern longitude 47˚ and 40 ′ to 47˚ and 52 ′ and northern latitudes 35˚ and 00 ′ to 35˚ and 04 ′. In this range, the intrusive rocks are Olivine gabbro, gabbro, gabbro diorite, diorite, monzonite, alkaline sinite, quartz diorite, quartz monzodiorite, quartz monzonite, quartz alkaline sinite, tonalite, granodiorite, granite and alkaline granite, 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, 90 thin sections were prepared and after petrography, 24 samples were selected for geochemical experiments. XRF analysis were performed on 9 samples and ICP and alkaline fusion were performed on 15 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. According to the alkaline-silica diagrams, the studied rocks are in the range of tolite, calk-alkaline, potassium-rich calk-alkaline, and shoshonitic series. Based on tectono-magmatic diagrams, samples of this quadrilateral have a meta-alumina 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

GEOCHEMISTRY AND PETROGENESIS OF PLUTONIC MASSES IN NORTH OF SONQOR (WEST OF IRAN)

The study area is a quadrilateral that is in west of Iran and north of Sonqor city of Kermanshah province. This area is 155 km2 between eastern longitude 47˚ and 40 ′ to 47˚ and 52 ′ and northern latitudes 35˚ and 00 ′ to 35˚ and 04 ′. In this range, the intrusive rocks are Olivine gabbro, gabbro, gabbro diorite, diorite, monzonite, alkaline sinite, quartz diorite, quartz monzodiorite, quartz monzonite, quartz alkaline sinite, tonalite, granodiorite, granite and alkaline granite, 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, 90 thin sections were prepared and after petrography, 24 samples were selected for geochemical experiments. XRF analysis were performed on 9 samples and ICP and alkaline fusion were performed on 15 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. According to the alkaline-silica diagrams, the studied rocks are in the range of tolite, calk-alkaline, potassium-rich calk-alkaline, and shoshonitic series. Based on tectono-magmatic diagrams, samples of this quadrilateral have a meta-alumina 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

Petrografía y geoquímica de magmas intrusivos en Varmaqan - Sardare ghobadi en el oeste de Irán

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 meta-alumina 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

APPLICATION OF FRACTAL MODELING BASED ON REMOTE SENSING DATA FOR DETECTING IRON MINERALIZATION IN DEHSHIR–BAFT FAULT, WEST OF CENTRAL IRAN

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

Estudio de la petrografía y la configuración tectónica de los umbrales en el distrito de Lavasanat, Teherán (norte de Irán)

The study area is located in Lavasanat District in the northeast of Tehran in Central Alborz zone. The outcrops are mainly linked to Karaj Formation, which belongs to the upper Eocene to Oligocene periods. In the study area, there are various plutonic rocks that are identified in the form of numerous dike and sill on the ground. These sills are injected in between sedimentary layers. The rocks forming the sills include the spectrum of gabbro, gabbro diorite, diorite, monzonite, and syenite. In some areas, these rocks have undergone alterations and have traces of the saussuritization and chloritization phenomena. There are also two generations of amorphous. The first generation is fully chloritized due to alteration while the second generation is unaltered. Unlike many diorites and monzonites, which typically have hornblendes, the neutral rocks such as diorite and monzonite lack hornblendes. Hence, their magmas were dry and dehydrated. Based on the geochemical studies conducted on 17 samples (15 sill samples and 2 host rock samples) and the diagrams of the tectonic settings of rocks, the study sills are in the WIN (within plate). However, two samples of the host rock are within the range of the active continental margins.El área de estudio se encuentra en el distrito de Lavasanat, en el noreste de Teherán, en la zona central de Alborz. Los afloramientos están principalmente vinculados a la Formación Karaj, que pertenece a los períodos del Eoceno superior al Oligoceno. En el área de estudio, hay varias rocas plutónicas que se identifican en forma de numerosos diques y antepechos en el suelo. Estos umbrales se inyectan entre capas sedimentarias. Las rocas que forman los umbrales incluyen el espectro de gabro, gabro diorita, diorita, monzonita y sienita. En algunas áreas, estas rocas han sufrido alteraciones y tienen rastros de los fenómenos de saussuritización y cloritización. También hay dos generaciones de amorfos. La primera generación está completamente cloritizada debido a la alteración, mientras que la segunda generación no se altera. A diferencia de muchas dioritas y monzonitas, que típicamente tienen hornblendes, las rocas neutras como la diorita y la monzonita carecen de hornblendes. Por lo tanto, sus magmas estaban secos y deshidratados. Según los estudios geoquímicos realizados en 17 muestras (15 muestras de alféizar y 2 muestras de roca huésped) y los diagramas de los ajustes tectónicos de las rocas, los alféizares del estudio están en el WIN (dentro de la placa). Sin embargo, dos muestras de la roca huésped están dentro del rango de los márgenes continentales activos

Estudio de la petrografía y la configuración tectónica de los umbrales en el distrito de Lavasanat, Teherán (norte de Irán)

The study area is located in Lavasanat District in the northeast of Tehran in Central Alborz zone. The outcrops are mainly linked to Karaj Formation, which belongs to the upper Eocene to Oligocene periods. In the study area, there are various plutonic rocks that are identified in the form of numerous dike and sill on the ground. These sills are injected in between sedimentary layers. The rocks forming the sills include the spectrum of gabbro, gabbro diorite, diorite, monzonite, and syenite. In some areas, these rocks have undergone alterations and have traces of the saussuritization and chloritization phenomena. There are also two generations of amorphous. The first generation is fully chloritized due to alteration while the second generation is unaltered. Unlike many diorites and monzonites, which typically have hornblendes, the neutral rocks such as diorite and monzonite lack hornblendes. Hence, their magmas were dry and dehydrated. Based on the geochemical studies conducted on 17 samples (15 sill samples and 2 host rock samples) and the diagrams of the tectonic settings of rocks, the study sills are in the WIN (within plate). However, two samples of the host rock are within the range of the active continental margins.El área de estudio se encuentra en el distrito de Lavasanat, en el noreste de Teherán, en la zona central de Alborz. Los afloramientos están principalmente vinculados a la Formación Karaj, que pertenece a los períodos del Eoceno superior al Oligoceno. En el área de estudio, hay varias rocas plutónicas que se identifican en forma de numerosos diques y antepechos en el suelo. Estos umbrales se inyectan entre capas sedimentarias. Las rocas que forman los umbrales incluyen el espectro de gabro, gabro diorita, diorita, monzonita y sienita. En algunas áreas, estas rocas han sufrido alteraciones y tienen rastros de los fenómenos de saussuritización y cloritización. También hay dos generaciones de amorfos. La primera generación está completamente cloritizada debido a la alteración, mientras que la segunda generación no se altera. A diferencia de muchas dioritas y monzonitas, que típicamente tienen hornblendes, las rocas neutras como la diorita y la monzonita carecen de hornblendes. Por lo tanto, sus magmas estaban secos y deshidratados. Según los estudios geoquímicos realizados en 17 muestras (15 muestras de alféizar y 2 muestras de roca huésped) y los diagramas de los ajustes tectónicos de las rocas, los alféizares del estudio están en el WIN (dentro de la placa). Sin embargo, dos muestras de la roca huésped están dentro del rango de los márgenes continentales activos