مقالات

The Gharebagh Phlogopite Deposit hosts phlogopite megacrysts up to 30 cm in diameter. It is associated with syenite intruded by mafic dykes. Phlogopite-bearing glimmerite veins are oriented along the dykes. The glimmerite is accompanied by a metasomatic sequence consisting of largely monomineralic, pyroxene-rich transition rocks and metasomatic, dark syenite. Petrography revealed abundant reaction textures in syenite host rock and mafic rocks. Comparing mineral relationships across host rocks and metasomatic rocks with data from whole-rock geochemistry indicate that K2O, MgO, CaO, and Na2O were highly mobile. We suggest that the deposition of those elements was controlled by the phlogopite crystallisation. The phlogopite accumulated K2O and MgO, whereas excess material was either incorporated in transition rocks (CaO) or transported further (Na2O). The abundance of calcite in all rocks suggests that CO2 played a major role in the metasomatic process

The Talkhab carbonate-hosted Pb-±Zn and barite deposit, located in the Tabas Block of the Central Iranian Microcontinent, is one of the major sulfide Pb±Zn and barite deposits in the southwest of Eshgabad, Tabas-Posht e Badam metallogenic belt (TPMB). This deposit is hosted in the Middle Triassic Shotori dolomites and includes stratabound mineralization of galena and barite with small amounts of pyrite, chalcopyrite and sphalerite. Structural and textural observations indicate that the mineralization occurs as fault fill with coarse-textured, brecciated and replacement sulfides. Silicification and carbonatization are the main wall-rock alteration styles.

Today, tourism is one of the most successful industries in the world in terms of scope and income and has a special view on the issue of geotourism. The Shotori Mountains in the east of Tabas city, due to the special geological, stratigraphic and fossil conditions, has a very suitable position to attract nature lovers and those interested in earth sciences. In this area, an unparalleled variety of types of geomorphological phenomena, geology, stratigraphic units, fossils and natural attractions related to the geotourism have impressed every viewer, and in the meantime, the presence of tourist target villages of Sorond, Modar and Hoze Dorah and the definition of special tourist routes in some parts of this mountain range, can be a very important and effective factor in attracting tourists. Variety of fossils such as brachiopods, cephalopods and corals, stratigraphic attractions including the outcrop of the Devonian-Carboniferous boundary as a global phenomenon (Shishto Formation), Carboniferous-Permian boundary outcrop between the Jamal and Sardar Formations, the border of Permian- Triassic boundary between Jamal Formations (Permian) and Sorkh Shale (Early Triassic) on the road of Sorond village, Jurassic outcrop (Baghmshah and Esfandiar Formations), karst attractions of Shotori and Esfandiar Formations, tectonic phenomena in stratigraphic units such as faulting, folding, tallus, and badlands, liesegang rings all could be geotourism attractions in the region. Therefore using these opportunities to develop tourism and boost the local economy can be used as one of the region's development strategies.

Coal-based power generation produces over 750 Mt of coal ash per year globally, but less than 30% of global production is utilized. Large amounts of fly ash are temporarily stored in stockpiles, disposed of in ash landfills or ponds. Coal fly ash (CFA) is a valuable industrial solid waste, but conventional methods used for its disposal can lead to severe and long-lasting environmental problems. Research into technologies for CFA recycling has been of great importance, while the damage caused by CFA is only partially understood, limiting its reuse. Coal ash is considered a significant potential source of release of many environmentally sensitive elements into the environment. Also, inhalation of suspended nano-sized coal fly ash particles through the respiratory tract and the presence of natural radionuclides in materials mixed with CFA and used for construction can cause serious health problems for humans and animals. This article presents the specific harm that CFA causes to humans, wildlife, and plants

Mining industry wastewater commonly contains heavy metals contaminant that pose severe threat on the public health and ecological systems while can be recovered and removed from the solutions. Between a lots of methods for removing heavy metals, absorption is the best. The aim of this study was to identify a new, inexpensive and abundant adsorbent to remove lead and cobalt pollution from industrial effluents. Modified perlite (Expanded perlite) (5mg/l) for adsorption of heavy metal ions Pb2+ (600mg/l), Co2+ (400mg/l) from aqueous solution wad used. Under these conditions, 97% of lead and 16% of cobalt are absorbed, which the absorption capacity of 6.06 and 1.77 mg/g respectively was reported. Adsorbents were characterized by XRD, FE-SEM and XRF. Moreover, adsorption isotherms, kinetics, thermodynamics, were studied to understand the mechanism of adsorbing metal ions. All the results demonstrate that modified expanded perlite is potential recyclable and effective adsorbents for heavy metal. The adsorption equilibrium was reached within 60 to 90 min and well described by pseudo second order model and adsorption isotherms being fitted with Langmuir model and adsorption process was endothermic

Mohammadabad manganese deposit is located in the Sabzevar structural zone and in the Late Cretaceous volcano-sedimentary sequence. This volcano-sedimentary sequence is located inside an anticline structure with a length of 100 km with a northeast-southwest trend. The geometric shape of this deposit is stratiform and manganese mineralization is limited to the host rock of marly tuff and limy tuff. Ore facies in this deposit is divided into two types of layered and massive facies. The high- grade mineralized part is formed in the western part of the deposit and the massive facies, which becomes more prominent as it moves to the east of the deposit. In proportion, the thickness and grade of the mineralization decreases until it finally reaches its lowest point in the eastern most part of the mineralization deposit. In this deposit, manganese oxide-hydroxides are the main ore minerals that have cutteded with the carbonate secondary mineral. Mineral structure and texture are observed in the form of massive, laminae, nodules, disseminated and replacement of manganese minerals in the inner cells of foraminifera and radiolarite fossils. The main ore minerals are pyrolusite, psilomelane, manganite and cryptomelane, which are formed in bedded and massive ore facies.