Studying the Genesis of Igneous Rocks in Zarin-Kamar Region (Shahrood, Northeastern Iran) by Rare Earth Elements

Kamoo region (northeast of Isfahan) has an anticline structure with a northwest-southeast trend. The exposed part of this anticline consists of siltstone-sandstone and Jurassic shale, which is located below the Cretaceous formation as an unconformity. Penetration by magmatic masses (dikes) and mineralization events are mainly related to fault systems and fractures in the region and follow the trend of the anticline. In addition, the intensity and variety of alterations are affected by tectonic factors, with alteration and metasomatic haloes having developed next to crushed areas. The alteration process is the main controller of mineral mass grade in the study area; therefore, iron grade in the Kamoo ore has increased by the effects of alteration. The alteration effects include propylitic haloes, iron hydroxides (limonite), and clay mineralization (argillic). The host rock consists of Jurassic shales with siltstone, sandstone, and Cretaceous limestone. Calcareous formations adjacent to granodiorite masses are the main hosts of iron skarns. The results of this study showed that the mineral samples from Kamoo were relatively rich in Light Rare Earth Elements (LREEs); the average La/Yb ratio is about 18.61 and Eu anomaly is between 0.52 and 1.94. Based on the findings of this study, the origin for Kamoo skarn was consistent with the model presented by Meinert, and the region’s mineralization and alteration characteristics correspond to the conditions prevailing in oceanic subduction and back-arc basin environments.

Section: Shale Unit -Siltstone and Jurassic Sandstonementioning

confidence: 96%

Examination of alteration and metasomatic zones based on the tectonic setting of the Kamoo region (northeast of Isfahan, Iran)

Alahbakhshi

Mehrnia

Espahbod

et al. 2020

“…Obviously, such a method can be applied to few earthquakes. Studies conducted in Iran using the teleseismic body wave modeling technique (Maggie et al 2000and 2002, Kheiri Namin et al 2015, Nazemi et al 2019, Baratian et al 2020 show that seismicity in the Iranian Plateau is essentially limited to the upper 20 km of the crust.…”

Section: Seismic Layermentioning

confidence: 99%

Seismic hazard and seismicity parameters in southwestern Alborz

Pourmohammad

Zaré

Dorostian

et al. 2021

Alborz Province is located west of Tehran Province on the South Alborz seismic belt. Geological and seismological analyses within a radius of 200 km from the center of Karaj identified five seismic zones and seven linear seismic sources. The maximum magnitude was calculated for the seismic zones using available correlations. The Kijko and Sellevoll (1992) method was used to calculate seismicity parameters, and the graphs of the return period and the probability frequency of recurrence of the earthquake magnitude in each zone were plotted for the 475-year return period. According to the calculations, the highest and lowest earthquake magnitudes of 7.6 and 6.2 were respectively obtained in Zones 1 and 4.

“…The Dehshir fault with the general direction of NNW-SSE has partially crossed the structural zones of Sanandaj-Sirjan, Urmia Dokhtar, and Central Iran magmatic arc. It is considered the western boundary of the set of the north-south dextral strike-slip fault of central Iran and eastern Iran, which is very important in terms of color mix expansion (Nazemi et al, 2019, Shafaii et al, 2010.…”

Section: Geology Of the Areamentioning

confidence: 99%

Detecting the potential lead, zinc, and gold orebodies by integrating remote sensing, geochemical, and geophysical studies in Dehshir (Iran)

Ahmadi

Jafari

Adib

et al. 2021

Nowadays, exploration management, increasing productivity, and reducing exploration costs are among the most important issues in the detailed exploration stage of orebodies. A geographic information system (GIS) is an effective tool for gathering, storing, analyzing, updating, generating, integrating, and displaying geographic data and land reference. ArcGIS is one of the efficient and powerful GIS computer programs with numerous capabilities such as generating databases, managing the data and information, integrating the information, and generating different outputs in the form of various maps, charts, and tables. In this study, different exploratory layers with different types of information from the Dehshir orebody area were integrated into this software to determine the spread of metal and introduce the parts with higher anomalies for subsurface exploration. For this purpose, we used the information from remote sensing, topography, geomorphology, geology, and geophysics, and geochemistry studies in the form of exploratory layers.