Economic Geology
Leila Jaberansari; habibollah Torshizian; Nader Kohansal Ghadimvand; Mohsen Pourkermani
Abstract
The current study was conducted on sedimentary units of the 1:100000 sheet of Jam and Sorkheh in Semnan Province, northeast of Iran. Because of its special geochemical properties, lithium can be concentrated in sedimentary rocks with clay minerals. Samples were collected from stream sediments and lithogeochemical ...
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The current study was conducted on sedimentary units of the 1:100000 sheet of Jam and Sorkheh in Semnan Province, northeast of Iran. Because of its special geochemical properties, lithium can be concentrated in sedimentary rocks with clay minerals. Samples were collected from stream sediments and lithogeochemical in three steps and were processed using Concentration-Number fractal modeling. Concentration-Number fractal modeling is a suitable geochemical exploration method to separate anomaly from the background. It was utilized to identify anomalous areas for lithum and the results were presented in the form of maps. As a result, The Gharavol kooh area of Biabanak in central part of sheet of Sorkheh. According to the lithology of the area, which contains marl and clay minerals (Illite and Cholorit), It was main anomaly between the two sheets. This area should be further investigated in Detailed exploration studies.
Exploration and Mining
Nazanin Mahbubi Motlagh; Ahmad-Reza Mahboubi Ardakani
Abstract
There are different methods to improve the technical characteristic of problematic soils. Stabilizing with lime and reinforcing by high tensile strength elements are among the improvement techniques.. The use of geosynthetics to improve the engineering properties of various types of soil is well accepted ...
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There are different methods to improve the technical characteristic of problematic soils. Stabilizing with lime and reinforcing by high tensile strength elements are among the improvement techniques.. The use of geosynthetics to improve the engineering properties of various types of soil is well accepted now. Most of the studies have been limited to coarse-grained soils and few studies has been done on the feasibility of geosynthetic reinforcement on cohesive soils. Due to the positive effects of adding lime to fine-grained soils and their reinforcement by geosynthetic, concurrent effects of these methods can develop the usage of fine-grained soils. In the current research, clay samples have been stabilized with 0, 2, 4 and 6 % of lime and reinforced with geosynthetic (geotextile and geogrid) and cured for 1 and 7 days and then subjected to direct shear test. To investigate the soil-geosynthetic interface parameters and reinforcement efficiency, the direct shear tests were done on reinforced samples with geotextile and two groups of reinforced samples with and without transverse members of geogrids. The test results reveal that stabilization with lime increases shear strength and it is also increased with curing time. The shear strength of reinforced samples is higher than that of unreinforced samples, and under the same normal stress the shear resistance of the soil reinforced by geogrid is higher than of that reinforced by geotextile. Under the same curing time, the highest shear strength and reinforcement efficiency is achieved in samples reinforced and stabilized with 4% of lime and they are also increased with increasing curing duration.
S. R. Shadizadeh; M. Zoveidavianpoor
Abstract
Abadan Refinery is located between Arvandrud and Bahmanshir rivers. These rivers supply urban, industrial and agricultural water of Abadan city. During the war between Iran and Iraq, leakage of large amounts of oil and its refined products from storage tanks, pipe lines, and refinery units of Abadan ...
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Abadan Refinery is located between Arvandrud and Bahmanshir rivers. These rivers supply urban, industrial and agricultural water of Abadan city. During the war between Iran and Iraq, leakage of large amounts of oil and its refined products from storage tanks, pipe lines, and refinery units of Abadan refinery to surrounding environment occurred. Also, leakage of petroleum and its products during the operation of Abadan refinery to surrounding environment led to conduct a research for determination of oil pollution extension of underground layers in Abadan refinery. Utilization of clays as natural geological barriers in environmental application and pollution control has been widely recognized. Abadan city was formed by recent Estuarine; these alluviums had a diverse variety in grain size and material. In the case of dominant presence of clay in underground layers, petroleum pollution control hypothesis of Abadan refinery is confirmed. In order to prove the above hypothesis the following items were conducted: 1) determination of material type of underground layers, 2) determination of petroleum pollution in underground layers and defining the oil saturation of the cores, and 3) determination of petroleum pollution in underground waters by one year sampling of underground waters along with measurement of piezometric head of groundwater monitoring wells. Location of twenty groundwater monitoring wells was investigated by considering petroleum leakage to surrounding area during and after war. Geological underground layers of Abadan refinery was determined from coring during drilling of the groundwater monitoring wells. The results of this investigation has shown that the material type of underground layers of Abadan refinery had a significant role to encapsulate petroleum leakage, in such a manner that leaked petroleum was observed in all of the drilled boreholes. On the other hand floated leaked petroleum on groundwater was observed just in two groundwater monitoring wells. These two polluted groundwater monitoring wells were shown to be from leakage of recent activities of Abadan refinery. Finally the results show that the majority of existing petroleum in underground layers of Abadan refinery was absorbed by clay
