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مرکز اطلاعات علمی SID1
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Title: 
Author(s): 

Issue Info: 
  • Year: 

    0
  • Volume: 

    20
  • Issue: 

    77 (ویژه نامه زمین شناسی)
  • Pages: 

    -
Measures: 
  • Citations: 

    0
  • Views: 

    1925
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Title: 
Author(s): 

Issue Info: 
  • Year: 

    0
  • Volume: 

    20
  • Issue: 

    77 (ویژه نامه زمین شناسی)
  • Pages: 

    -
Measures: 
  • Citations: 

    0
  • Views: 

    1434
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Title: 
Author(s): 

Issue Info: 
  • Year: 

    0
  • Volume: 

    20
  • Issue: 

    77 (ویژه نامه زمین شناسی)
  • Pages: 

    -
Measures: 
  • Citations: 

    0
  • Views: 

    926
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Author(s): 

ARIAN M.

Issue Info: 
  • Year: 

    2010
  • Volume: 

    20
  • Issue: 

    77 (GEOLOGY ISSUE)
  • Pages: 

    1-22
Measures: 
  • Citations: 

    0
  • Views: 

    1332
  • Downloads: 

    278
Abstract: 

Introduction: Kerman Quadrangle has situated in the south western part of Lut plain in the Central Iran zone that characterized by major earthquakes.Aim: Evaluation of earthquake –fault hazard in the of the Kerman Quadrangle and preparation of seismic zoning maps.Matherial and Methods: According to field evidences and remote sensing processes, Quaternary and active major faults are introduced and seismicity history of this region is analyzed. Also, Seisrisk III computer program used for seismic risk estimation.Results: NNW-SSE Gowk fault system is the most important seismic source in the Kerman Quadrangle and seismic zoning maps have prepared.Conclusion: Kerman Quadrangle is an active part in the Central Iran zone and maximum acceleration of earthquakes in there is 0.65 gall.

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    20
  • Issue: 

    77 (GEOLOGY ISSUE)
  • Pages: 

    23-36
Measures: 
  • Citations: 

    0
  • Views: 

    720
  • Downloads: 

    509
Abstract: 

Introduction: The Javaherdasht Basalts with Cretaceous age cover vast area in the narthen part of Alborz mauntain at the East of Guilan province. Various theories are expressed for tectonic setting of the basalts. Some of the theories concern the basalts in related to ophiolite complexes, and others to back-arc basins.Aim: Determination of tectonic and geodynamic setting of the basalts is the main aim of this study.Materials and Methods: For creating of the research, 12 samples are analized by XRF method. 143Nd/144Nd & 87Sr/86Sr isotopic ratios of 5 samples from the stadied basalts were determined in the laboratory of Carleton university (Canada).Results: Study of The rang of the Incompatible elements pattern and compare the data with the crustal range, also the study of 143Nd/144Nd & 87Sr/86Sr isotopic ratios and incompatible elements ratios show that the basalts have been concerned to intra-continental rift magmatism wich are contaminated with continental crust rocks in various quantities.Conclusion: As a result of the crustal contamination, the original geochemical properties of the basalts were changed untruthly subduction zones geochemical features. It is comparable with transitional basalts of Rio Grande rift, Ethiopian rift and Basin & Range province.

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    20
  • Issue: 

    77 (GEOLOGY ISSUE)
  • Pages: 

    37-50
Measures: 
  • Citations: 

    0
  • Views: 

    1599
  • Downloads: 

    246
Abstract: 

Introduction: First time Stull established existence of Triassic deposits in Alborz.Glaus named this rock package as Elika formation. Type section measured in Elika valley (north of Tehran). In this section Elika formation include 95 meters of thin bedded limestone to shally limestone and 200 meters of dolomite and dolomitic limestone. In Studied area (Jolfa) Triassic deposits are equivalent with Elika formation. Study of these deposits started in 19th century by Abish.Aim: Present paper tries to represent facieses, sedimentary environments and sedimentary sequences of Triassic deposits in Western Jolfa. Facies division based on microscopic studies and field investigations and their nomination is based on Donhom classification. Sedimentary environments described on vertical and horizontal shift of facies and finally sequences are divided by sequence stratigraphy principles.Materials and Methods: First step of this study was field works such as thickness, dip and streak measurement and sampling. Second step was production of thin sections from rock samples for microscopic studies. Stratigraphic column of studied section drew by field information. Based on microscopic studies microfacies groups and then sedimentary environments were specified. Finally upward shallowing cycles, system tracts and sedimentary sequences were distinguished. Determination of sedimentary environments and sequences was microfacies and field geology works.Results: Study of Triassic deposits in Western Jolfa established five main group of facies belong to open marine, bar, lagoon, intertidal and supratidal environments and finally form three sedimentary sequences.Conclusion: 855 meters of trissic deposites are exposed in studied area. In this area Permian and Triassic boundary is spotted as continues boundary. But sequence stratigraphic studies established a type 2 unconformity (SB2). Also these deposits covered with Miocene conglomerate with angular unconformity. Based on field and laboratory works Triassic deposits in Western Jolfa divide in two parts (carbonate and clastic). Lower boundary of first sequence is SB2 and upper boundary of third sequence is SB1. Also first and second sequences show less correlation with global sea level curve but third sequence is comparable with global sea level curve.

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Author(s): 

ROBATIAN M.

Issue Info: 
  • Year: 

    2010
  • Volume: 

    20
  • Issue: 

    77 (GEOLOGY ISSUE)
  • Pages: 

    51-62
Measures: 
  • Citations: 

    0
  • Views: 

    778
  • Downloads: 

    195
Abstract: 

Introduction: A few basic intrusive bodies are located in the northeastern part of Iran within the Gorgan Rashat and the Eastern Alborz Moutain range zones. This plutonism has a relative of the Upper Jurassic to Early Cretaceous ages, and is being introduced for the first time in this paper.Aim: The study and investigation of the intrusive bodies with respect to their origin and state.Materials and Methods: In order to achieve this purpose, the following methods are used: preparation of the necessary number of microscopic thin sections (to study the structure, mineralogy, petrographic characteristics), XRF analysis (in order to obtain the chemical compositions of these rocks), and K-Ar geochronologic method (in order to find the age of the minerals and the entire rock). Firstly, all of the thin sections are studied using a polarized microscope, then selected samples are sent to the lab in order to find and study their chemical compositions. After that, a few samples are analyzed by mass spectrometry to measure their chronologic age.Results: This intrusive body has penetrated the Shemshak formation and from a petrographic point of view, it is a basic type that includes gabbro, gabbro-norite, gabbrodiorite and gabbro-monzonite rocks (listed in order of their importance and abundance). The major minerals present in these rocks are olivine, ortho-clino pyroxenes, and calcic plagioclase. The minor minerals, according to their percentage content, are K-feldspar; which is more abundant in monzo-gabbros than plagioclase, and also apatite, magnetite and amphibole, respectively. Amphibole is more abundant in monzo-gabbroic rocks which have a pegmatitic texture. Quartz, and zircon are also present as minor minerals. The textures are cumulate, and adcumulatic types in gabbro-norites. Also, in other types of rocks, the textures are granular, ophitic, sub-ophitic, intergranular intersertal, and in some cases, are of a pegmatitic type which lack any type of zonation or alteration, as observed. The mechanism and shape of the intrusive studied body is of the laccolith type. The mineralogical composition and crystallization sequence of minerals and the succession of mineralogical fractionation series is comparable to calco-alkaline plutonism. According to the K-Ar method, the chronological age of these intrusive bodies are found to be from 126.4 to 145.6 Ma., Upper Jurassic and Early Cretaceous. These are also related to early Alpian tectonic movements.Conclusion: These intrusive rocks are of the Upper Jurassic and Early Cretaceous, that have Calco-Alkaline magmatism (plutonism), formed along the orogenic belt from Turkey- Ghafghaz (at the west side) to the Band-e-Bayan region in Afghanistan (at the east side). At some regions of this orogenic belt, most geological activities involve plutonism, while volcanic eruptions comprise the minor portion of these activities. According to the location of these plutones and extrusive rocks along this belt, they are formed at volcanoplutonism movements between the Upper Jurassic and Early Cretaceous.

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Author(s): 

KOKABI NEZHAD A.H. | KHAKI V.

Issue Info: 
  • Year: 

    2010
  • Volume: 

    20
  • Issue: 

    77 (GEOLOGY ISSUE)
  • Pages: 

    63-70
Measures: 
  • Citations: 

    0
  • Views: 

    933
  • Downloads: 

    511
Abstract: 

Introduction: Studies on classic vertebrate fauna of Late Miocene in Maragheh done by the authors, led to extract new specimens of different families, especially Hipparions.By biometry of lower teeth and mandibles of anew speciment and comparisons made with with previous and some other new speciment determined new characteristics. Regarding importance of studing this new speciment, its namedHipparion iranica.Aim: Biometry of form and reliefs of lwer teeth and mandible of the speciment shoed new results. So, the new characteristics would introduce anew spicies.Material and Method: Biometry was done with standard of Eisnnman (1988) and Macfadden (1984) method.Results: Studies showed that size of mandible and dental form the previous ones.So to make it sinifigant a name was choosen for it, Hipparion iranica. Further more it became clear that the fossil fauna of northwestern Iran is similar to that of central western Europe, northern and eastern Africa, Italian Iceland, Greece, Turkey and eastern asia.Conclusion: The results reported by the authers determined Iran, not only is similar to other fossil fauna in late Miocene but also did have little differences in above mentioned conditions thrugh middle Miocene to Quaternary.This regional climate changes led to new species origin, omission of spicies or morphological and genetic chages in species.

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    20
  • Issue: 

    77 (GEOLOGY ISSUE)
  • Pages: 

    71-88
Measures: 
  • Citations: 

    0
  • Views: 

    992
  • Downloads: 

    685
Abstract: 

Introduction: Field investigation and survey of geological maps of the Shomal highway showed that there has been an old landslide in the Dashtegan area, when the new landslide has occurred.Aim: Study of Dashtegan landslide and it's effect on Qazvin- Rasht highway.Results: One part of the main factors for triggering the landslide in the area is the function of Sefidrood river (Gradient, meander, stresses, erosion, …). In addition, ground conditions like geological structures, discontinuities, slope geometry, water and the excavation for the road have caused the slope instability.Conclusion: We have studied the above mentioned factors in the area and suggest remedial work to stabilize the above mentioned landslide.

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    20
  • Issue: 

    77 (GEOLOGY ISSUE)
  • Pages: 

    89-106
Measures: 
  • Citations: 

    0
  • Views: 

    1669
  • Downloads: 

    846
Abstract: 

Introduction: Determination of the background limit and separating anomalies from the background is very important in geochemical data analysis. This is more important for data which are collected from stream sediments samples. Nowadays, one of modern technique for separating anomalies from background is fractal methods. This is very useful and suitable for separating data distribution due to their spatial distribution and anomalies geometrical features. Concentration-perimeter method is very useful and high level confidence for separating of geochemical societies, especially in stream sediments data.Aim: In this study, background and anomalies were separated for Cu, Au, Mo, Ag and As in Zajkan area from Tarom in Zanjan province.Material and Method: First, 84 stream sediments samples were collected from the area and these were chemical analysis. Also, single and two variation statistical parameters were calculated. Next, based on the results area was grided and grades evaluated were done for these elements by grid evaluation method especially stream sediments. Then, Concentration-perimeter logarithmic diagrams were drawn for these elements and geochemical societies were separated. Finally, elements distribution maps were drawn in the area and their results were comprised by classical statistics and coefficient correlations.Results: Results from usage of fractal concentration- perimeter model shows that proved anomalies areas of these elements are situated in central and eastern parts of Zajkan.Conclusion: The comparison shows that fractal concentration- perimeter model is better than classical statistics.

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Author(s): 

BAKHSHANDEH L.

Issue Info: 
  • Year: 

    2010
  • Volume: 

    20
  • Issue: 

    77 (GEOLOGY ISSUE)
  • Pages: 

    107-128
Measures: 
  • Citations: 

    0
  • Views: 

    817
  • Downloads: 

    586
Abstract: 

Introduction: The main lithology of Abderaz Formation includes gray to blue shale with a thickness of 286.86 meters. This Formation an attitude of N45W direction and 80SW dip direction. It’s lower boundary with Aitamir Formation is paraconformity and upper boundary with Abtalkh Formation is conformable. The main lithology of the Abtalkh Formation includes gray marls and with a thickness of 793 meters.It’s lower boundary with the Abderaz Formation and upper boundary with the Neyzar Formation, have continues.Aim: The aim of the present study is to determination of the biostratigraphy zonation on Late Cretaceous that consist from (Early Turonian - Late Maastrichtian) to introduce the first appearance & Last appearance of the fauna that mostly contain Genus & species are concider at this time range.Material and Methods: during 3 week on field trip, 91 samples are chosen (81 samples free & 10 samples thinsection) for study. all the material are prepared in the lab determination.Results: In the present investigation, 68 planktonic species of 26 genus have been identified. However, according to Foraminifera content of the Abderaz and Abtalkh formations 12 biozones were determined in the Mozduran Section (Kopeh-Dagh) that show an Early Turonian – Late Maastrichtian age.It is mentioned this zonation is recorded for the first time.Conclusion: It is concluded 12 biozones in the Kopeh-Dagh area, Mozduran Section that show an Early Turonian – Late Maastrichtian age.

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    20
  • Issue: 

    77 (GEOLOGY ISSUE)
  • Pages: 

    129-150
Measures: 
  • Citations: 

    0
  • Views: 

    1330
  • Downloads: 

    224
Abstract: 

Introduction: In the Qarachilar-Qaredareh area Cu-Mo mineralization has occured in the center of a batholith that related to acidic rocks. Mineralization is observed in three form that related to: 1) quartz veins: These quartz veins have trended NW-SE and their thickness vary from 0.1 to 3 meters.2) mineralized dykes: In the center of hydrothermal activity intruded acidic and mineralized dykes that have porphyritic texture and trended NW-SE (occasionally NE-SW).3) igneous rocks: Cu-Mo are formed in the rock matrix as dissimination and stockwork. Main characteristic of this mineralized area, is developing of silicic alteration as vein-veinlet also development of potasic and propilitic zones.Aim: In this arae, study of both Cu-Mo mineralization and alteration zones (silicic, potassic, propilitic) related to intrusive can be used as exploration pattern in other region.Study manner: In this research, we have been identified all existing altered zones and mineralized veins, then have been taken samples from favorable section. Altereted and fresh rock samples analyzed with XRF method. As well as mineral and ore minerals studied to method of macroscopic and microscopic that results of these compared with study of geochemistry maclean and Grant method.Results: Integration of mineralography and geochemistry information indicate that mineralography variation corresponded with geochemistry variation (depletion and enrichment elements) and the potassic-propilitic zones are separable. The potassic zone is marked by secondary k-feldespar, biotite and Cu-Mo-Fe ore minerals (chalcopyrite, molybdenite, magnetite) also the propilitic zone is identified with epidote and chlorite minerals. Most quartz veins, mineraized zones and dykes developed in the potassic zone.Conclusion: In this area, type of alteration and mineralization is corresponded with vein type mineralization ralated to giant intrusive (batholith), but development of porphyritic mineralized dykes in the potassic zone of Qarachilar indicate that likely is located a porphyritic mineralized stock onder these mineralized dykes and veins.

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    20
  • Issue: 

    77 (GEOLOGY ISSUE)
  • Pages: 

    151-172
Measures: 
  • Citations: 

    0
  • Views: 

    1439
  • Downloads: 

    898
Abstract: 

Introduction: To investigate the mineralogy of soils formed on Aghajari Formation and its relationship to topography, two soil profiles were selected, Masjed-Suleiman and Ghale-Khaje. Soil profiles as well as soil samples were selected in a way to show the effects of topography in a toposequence. The soils had the same parent materials while topography as well as climate was their most important diffraction factors Aim: The aims of this research are to identify mineralogy, topography effects on the clay minerals conversions and soils evolution on a toposequence, with same parent materials in Masjed-Suleiman and Ghale-Khaje Area.Material and Methods: After surveying the area, based on topography and site properties, five profiles were dig in a toposequence. All profiles were described based on USDA Standard Soil Description Manual and soil samples were taken from all horizons.Mineralogy of the soils was thoroughly studied by X-ray Diffraction (XRD) method.Result: X-ray differactograms showed Illite, Kaolinite, Quartz and Feldespares in parent materials and Illite, Chlorite, Kaolonite, Vermiculite, Smectite as well as Paligorskite in soils body.Conclusion: The results also showed that as move from the top to the downhill, the amount of primary minerals such as Illite was decreased while Smectite was increased. This could be described as soil development criteria. Also, with decrease in slope, cation exchange capacity (CEC) of the soils were increased which is due to increase in Smectite as well as Vermiculite minerals in the soil body.

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    20
  • Issue: 

    77 (GEOLOGY ISSUE)
  • Pages: 

    173-184
Measures: 
  • Citations: 

    0
  • Views: 

    955
  • Downloads: 

    871
Abstract: 

Introduction: Analysis of lineaments is considered to be the basis of tectonic and structural studies. In this study, the lineaments related to the Saravand-Baznavid fault zone, that is one of the segments of the Main Zagros Recent Fault are extracted using Landsat and IRS imaging and Shaded relief models.Aim: The aim of this article is Automated Lineaments Extraction Related to the Main Zagros Recent Fault Zone in the Southern Loresten and Compare with Field Investigation.Material and Methods: Applied method in this study was automated lineament extraction and the lineament layers obtained from this method were overlay to produce a final lineaments map. The Extracted trends from final lineaments map belong to main faults in the area.Results: The NE-SW trends are related to the strike slip faults that are located between the main faults while the NW-SE trends are related to SBF (Saravans Baznavid Fault) and its related fractures like Eslam Abad fault.Conclusion: The SBF and the Eslam Abad fault are R and P fracture types formed as a result of collision between Iran and Arabian plates.

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    20
  • Issue: 

    77 (GEOLOGY ISSUE)
  • Pages: 

    185-202
Measures: 
  • Citations: 

    0
  • Views: 

    1307
  • Downloads: 

    986
Abstract: 

Introduction: Mosha fault is one of the major active structures51o, 45’ to 51o, 30’ on southern boundary of central Alborz. In this project we study about the area between longitudes 51o, 45’ to51o, 30’ that includes central-western part of Mosha fault. Stress evolution was investigated with the helps of inversion method and with measuring 120 striated fault planes and related striations.Aim: investigation of stress evolution and dynamic analysis of Mosha fault in the study of area.Material and Method: separation of phase on the data’s was done and stress evolution was investigated for each phase separately via inversion method. Finally, obtained results from both of these stages and compared with each other with using the cross cutting relations of individual fault planes and several of events, the ages of stress changes were determined.Results: obtain three distinct stress directions in zone, on Mosha fault. In long with NW, N and NE, that cause changes of Mosha fault mechanism from reverse with right-lateral strike slip component tectonic regime to reverse with left-lateral component.Conclusion: These stress directions appear in transpiration tectonic, and they, overcome compression regime to strike slip regime. With using the cross cutting relations of individual fault planes and several of events, the ages of stress changes were determined.

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Author(s): 

ZAKARIAEE J. | MONSEF I.

Issue Info: 
  • Year: 

    2010
  • Volume: 

    20
  • Issue: 

    77 (GEOLOGY ISSUE)
  • Pages: 

    203-220
Measures: 
  • Citations: 

    0
  • Views: 

    1096
  • Downloads: 

    691
Abstract: 

Introduction: The Ghorveh metamorphic complex consists of regional and contact metamorphic rocks. The regional metamorphic rocks are including meta-sediments and metalimestone and are related to green schist to amphibolite facies.Aim: The contact metamorphic series are schist, marbls and quartzite and are inferred to result from hornblend to pyroxene hornfels facies.Methods: Studying of oriented thinsection using of universal stage.Results: The LPO Patterns of quartz in regional metamorphic schists show basal slip system along a<a>direction that confirms the green schist facies condition. The pattern of c- axes distributions of quartz in the marbles reveals a basal and rhomb slip system along a<a>direction that are consistent with green schist to lower amphibolite facies.Conclusions: According to microstructural studies two discrete deformational events are recorded in Ghorveh metamorphic rocks. The first deformational phase (D1) forms a first schistosity (S1) and inter-tectonic staurolite and garnet porphyroblasts. The second phase of deformation (D2) as a S2 fabric followed by syn to post-tectonic andalusite, sillimanite and cordierite porphyroblasts. In the last stage, the retrograde metamorphic events are created from emplacement of metamorphic rocks. As result, the proposed P-T-t path indicates a clockwise path with maximum temperature 700oc and maximum pressure 4 Kbar for Ghorveh metamorphic complex.

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    20
  • Issue: 

    77 (GEOLOGY ISSUE)
  • Pages: 

    237-251
Measures: 
  • Citations: 

    0
  • Views: 

    1933
  • Downloads: 

    260
Abstract: 

Introduction: Lamprophyres are a group of alkaline rocks which usually observed as sub-volcanic intrusions. They include abundant foliated minerals such as mica or amphibole.Spessartite is a type of lamprophyres that usually includes hornblende, pyroxene, albite, alkali feldspar and rarely quartz, also its plagioclase content is more than alkali feldspar’s.Spessartite bodies are usually observed around diorite and granitoid intrusions.Aim: introducing petrographical and geochemical characteristics of sub-volcanic spessartite bodies in Saghez area (NW Kurdistan Prov.) which intruded within cretaceous volcanic rocks with lithology of andesite and basaltic andesite.Materials and methods: during a study on cretaceous volcanic rocks in Saghez area, sometimes sub-volcanic bodies of spessartite (usually in dyke form) observed. Their characteristics in field studies are green color, foliated structure (which usually named diaschistic) and brecciation and oxidation of host rock. After field study and sampling, 10 thin sections prepared for petrographical studies and 9 specimens were analyzed by geochemical methods (XRF and ICP-MS).Results: during petrographical study, special pan-idiomorphic texture observed which formed by pyroxene phenocrysts and small automorphic hornblende grains within a background of plagioclase (albite), sometimes alkali feldspar, chlorite and calcite. Weak alteration (chloritization and carbonatization) usually affected these rocks also their fractures frequently filled by calcite, chlorite, albite and/or epidote. Based on particular classification of lamprophyres using light color minerals, the studied samples were named as spessartite (a calc-alkaline type). According to geochemical study, the analyzed samples located at the field of alkaline rocks. Also, rare earth elements’ diagrams show high concentration of LREEs.Moreover, high content of Ti and P in these rocks is considerable.Conclusion: Due to high content of plagioclase (albite) and hornblende (magnesiohornblende) and spatial relations of studied bodies with granitoid and diorite plutons, lamprophyre rocks in Saghez area could be named as appinitic spessartites, while they show geochemical properties of spessartites and lamproites (extrusive lamprophyres). High concentration of LREEs in these rocks seems to happen due to low degree partial melting at mantle source, but we can’t forget possible crustal contamination of ascending magma.

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