PETROCHEMICAL CHARACTERIZATION OF WEATHERING CRUSTS OF OLKHOVSK-CHIBIZHEK DISTRICT
The relevance of the research is defined by the need to expand and strengthen the resource potential of the gold mining industry. The aim of the study is to obtain new information about the structure, zonality, mineral composition of weathering crusts of Olkhovsk-Chibizhek district and to define th...
| Format: | Article |
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| Language: | Russian |
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Tomsk Polytechnic University
2018-12-01
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| Series: | Известия Томского политехнического университета: Инжиниринг георесурсов |
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| Online Access: | http://izvestiya.tpu.ru/archive/article/view/29 |
| _version_ | 1797811145889808384 |
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| collection | DOAJ |
| description |
The relevance of the research is defined by the need to expand and strengthen the resource potential of the gold mining industry. The aim of the study is to obtain new information about the structure, zonality, mineral composition of weathering crusts of Olkhovsk-Chibizhek district and to define the geochemical criteria that contribute to concentration of gold mineralization. Objects: residual and redeposited weathering crust of kaolinite and hydromica-kaolin composition from Olkhovsk-Chibizhek area (East Sayan). According to the occurrence, there are linear and linearly areal types of weathering crusts, mainly gold-bearing, within the area. Research methods include quantitative determination of the main rock-forming elements of the weathering crust by X-ray fluorescence analysis using energy dispersive x-ray fluorescence microscope (HORIBA XGT-7200). The weathering coefficients were used to characterize weathering crust formation and its quantitative evaluation. The analysis of the rock-forming elements distribution across the weathering crust with potential gold-bearing horizon determination was performed. Research results. It was found that the residual and redeposited weathering crusts are widely spread within Olkhov-Chibizhek district. The residual weathering crusts of the Cretaceous-Paleogene age are developed on felsic and intermediate rocks of the Olkhovsk complex and on carbonate formation of the Chibizhek suite. They are represented by linear and linear-areal morphological types. The weathering products are composed of clay, sand-clay and gruss-gravel material, with a predominance of fine-dispersed clay fraction. They are intensely limonitized and carbonized. Composition of the residual weathering crust belongs to the kaolinite and kaolinite-hydromice type. Weathering crust profile is characterized by the development of a complete profile, which has gruss-detrital, montmorillonite-hydromica and ochre-kaolin zone. As a result, the mineral composition peculiarities of the weathering crust of Olkhov-Chibizhek district are studied; mineralogical and petrochemical features of residual weathering crust are characterized. The nature of the weathering ratios change and characteristics of gold distribution across a vertical section are established. Geochemical criteria for gold accumulation in the products of the weathering crust are defined. High contents of gold are confined to the lower part of the upper ochre-kaolin zone with high values of the ferritization, allitization and oxidation coefficients, and minimum values of the leaching coefficient. Conversely, low content of gold is typical for less weathered rocks with low values of ferritization, allitization and oxidation coefficients.
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| first_indexed | 2024-03-13T07:19:23Z |
| format | Article |
| id | doaj.art-a3f78118c1614d02ad8ba167d9b37a42 |
| institution | Directory Open Access Journal |
| issn | 2500-1019 2413-1830 |
| language | Russian |
| last_indexed | 2024-03-13T07:19:23Z |
| publishDate | 2018-12-01 |
| publisher | Tomsk Polytechnic University |
| record_format | Article |
| series | Известия Томского политехнического университета: Инжиниринг георесурсов |
| spelling | doaj.art-a3f78118c1614d02ad8ba167d9b37a422023-06-04T21:06:42ZrusTomsk Polytechnic UniversityИзвестия Томского политехнического университета: Инжиниринг георесурсов2500-10192413-18302018-12-013291210.18799/24131830/2018/12/29PETROCHEMICAL CHARACTERIZATION OF WEATHERING CRUSTS OF OLKHOVSK-CHIBIZHEK DISTRICT The relevance of the research is defined by the need to expand and strengthen the resource potential of the gold mining industry. The aim of the study is to obtain new information about the structure, zonality, mineral composition of weathering crusts of Olkhovsk-Chibizhek district and to define the geochemical criteria that contribute to concentration of gold mineralization. Objects: residual and redeposited weathering crust of kaolinite and hydromica-kaolin composition from Olkhovsk-Chibizhek area (East Sayan). According to the occurrence, there are linear and linearly areal types of weathering crusts, mainly gold-bearing, within the area. Research methods include quantitative determination of the main rock-forming elements of the weathering crust by X-ray fluorescence analysis using energy dispersive x-ray fluorescence microscope (HORIBA XGT-7200). The weathering coefficients were used to characterize weathering crust formation and its quantitative evaluation. The analysis of the rock-forming elements distribution across the weathering crust with potential gold-bearing horizon determination was performed. Research results. It was found that the residual and redeposited weathering crusts are widely spread within Olkhov-Chibizhek district. The residual weathering crusts of the Cretaceous-Paleogene age are developed on felsic and intermediate rocks of the Olkhovsk complex and on carbonate formation of the Chibizhek suite. They are represented by linear and linear-areal morphological types. The weathering products are composed of clay, sand-clay and gruss-gravel material, with a predominance of fine-dispersed clay fraction. They are intensely limonitized and carbonized. Composition of the residual weathering crust belongs to the kaolinite and kaolinite-hydromice type. Weathering crust profile is characterized by the development of a complete profile, which has gruss-detrital, montmorillonite-hydromica and ochre-kaolin zone. As a result, the mineral composition peculiarities of the weathering crust of Olkhov-Chibizhek district are studied; mineralogical and petrochemical features of residual weathering crust are characterized. The nature of the weathering ratios change and characteristics of gold distribution across a vertical section are established. Geochemical criteria for gold accumulation in the products of the weathering crust are defined. High contents of gold are confined to the lower part of the upper ochre-kaolin zone with high values of the ferritization, allitization and oxidation coefficients, and minimum values of the leaching coefficient. Conversely, low content of gold is typical for less weathered rocks with low values of ferritization, allitization and oxidation coefficients. http://izvestiya.tpu.ru/archive/article/view/29Weathering crustEastern Sayanstructurezonationmineralogical and geochemical featuresgold deposits. |
| spellingShingle | PETROCHEMICAL CHARACTERIZATION OF WEATHERING CRUSTS OF OLKHOVSK-CHIBIZHEK DISTRICT Известия Томского политехнического университета: Инжиниринг георесурсов Weathering crust Eastern Sayan structure zonation mineralogical and geochemical features gold deposits. |
| title | PETROCHEMICAL CHARACTERIZATION OF WEATHERING CRUSTS OF OLKHOVSK-CHIBIZHEK DISTRICT |
| title_full | PETROCHEMICAL CHARACTERIZATION OF WEATHERING CRUSTS OF OLKHOVSK-CHIBIZHEK DISTRICT |
| title_fullStr | PETROCHEMICAL CHARACTERIZATION OF WEATHERING CRUSTS OF OLKHOVSK-CHIBIZHEK DISTRICT |
| title_full_unstemmed | PETROCHEMICAL CHARACTERIZATION OF WEATHERING CRUSTS OF OLKHOVSK-CHIBIZHEK DISTRICT |
| title_short | PETROCHEMICAL CHARACTERIZATION OF WEATHERING CRUSTS OF OLKHOVSK-CHIBIZHEK DISTRICT |
| title_sort | petrochemical characterization of weathering crusts of olkhovsk chibizhek district |
| topic | Weathering crust Eastern Sayan structure zonation mineralogical and geochemical features gold deposits. |
| url | http://izvestiya.tpu.ru/archive/article/view/29 |