MICROCOMPONENT COMPOSITION OF LOW-MINERALIZED NITROGEN THERMES OF THE GISSAR RIDGE (PAMIR-ALAY MOUNTAIN SYSTEM)
The relevance of the research is caused by the need for reasonable use of natural resources and thermomineral waters, in particular the unique balneoclimatic resort of Khoja-Obi-Garm, located in the central part of the spurs of the southern slope of the Gissar Ridge. The investigation of the microco...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | Russian |
| Published: |
Tomsk Polytechnic University
2019-09-01
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| Series: | Известия Томского политехнического университета: Инжиниринг георесурсов |
| Subjects: | |
| Online Access: | http://izvestiya.tpu.ru/archive/article/view/2251/2050 |
| Summary: | The relevance of the research is caused by the need for reasonable use of natural resources and thermomineral waters, in particular the unique balneoclimatic resort of Khoja-Obi-Garm, located in the central part of the spurs of the southern slope of the Gissar Ridge. The investigation of the microcomponent composition of these waters remains one of the most pressing problems for the study. The main aim. The study of these waters began in the middle of the twentieth century, but the microcomponent composition of the waters is still poorly understood. The main aim of this work is a detailed study of distribution of chemical elements in thermal waters of the Khoja-Obi-Garm field, as well as identification of sources of their supply, mechanisms and factors of mobilization and fractionation. Objects of the research are groundwater and water-bearing rocks of the low-mineralized thermal waters of Khoja-Obi-Garm, which is confined to the Pamir-Alai mountain system (Tajikistan). Methods. The results of chemical analyzes of the water phase and water-bearing rocks are presented in the analytical units of the Far Eastern Geological and Far Eastern Oceanological Institutes of the Far Eastern Branch of the Russian Academy of Sciences. The main cations and anions of thermal waters were determined by the method of liquid ion chromatography (HPLC-10AVp, SHIMADZU), and micro- and scattered elements were analyzed using plasma-optical emission spectrometry (ICP-AES, Plasmaquant-110) and inductive plasma mass spectroscopy (ICP -MS, Agilent 7500c). For more complete understanding of the processes taking place in the water-rock system, the following programs were used: AQUACHEM 5.1, WATERQ4F, PHREEQC. The macrophotographs of the water-bearing rocks were performed with a Nikon digital camera, and petrographic studies were performed using a Leica-E stereoscopic microscope equipped with a digital camera. The content of the main elements in the samples was determined by atomic emission spectrometry on an iCAP 7600 Duo (Thermo Scientific) spectrometer and by inductively coupled plasma mass spectrometry using an Agilent 7500 spectrometer (Agilent Techn.). Results. This article presents the results of complex studies of groundwater and water-bearing rocks of the low-mineralized thermal waters of the Khoja-Obi-Garm, which is confined to the Pamir-Alai mountain system (Tajikistan). According to the formation conditions, the thermal waters studied belong to the fissured lead waters that circulate within the massive intrusions localized within the Alpine folding zone. According to the chemical composition, the thermal waters of the Khoja-Obi-Garm deposit belong to the chloride-sulphate (450 mg/l) hydrocarbonate sodium-siliceous waters. Water is enriched with fluorine (up to 17 mg/l), lithium (up to 1,03 mg/l), rubidium (up to 123 μg/l), cesium (about 205-230 μg/l), arsenic (up to 5,7 μg/l) and radon (up to 815 Bq/l). The study shown as well that rare elements in rock formations of the deposit form in accordance with their content the following sequence: Rb>Th>Sc>Ga>U>>Cd. The thermal waters of the field are largely enriched with Rb, which has the highest coefficient of water migration among the rare elements, then Ga follows. The remaining elements are presented in the «trace» quantities. When moving from depth to surface, thermal waters intensively interact with water-bearing rocks, dissolve and leach them. During this process, intensive leaching of many microcomponents (La, Rb, Zr, Ba, Li, etc.) and their concentration in waters occur. |
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| ISSN: | 2500-1019 2413-1830 |