Abstract
In this paper data on the mineral and chemical composition of tonsteins from the Jurassic Azeisk deposit located in the Irkutsk Basin (South Siberia, Russia) are presented. The mineral composition includes kaolinite (87-89%); quartz (3.0-4.0%), cristobalite (4.9-5.3%), illite (1.9-2.1%) and feldspar (1.0-2.0%). Accessory minerals comprise zircon, monazite, uranium oxides, native minerals (gold, silver, nickel, zinc, tungsten, and silicon), sulfides and intermetallic compounds. The tonsteins and coals of the Azeisk deposit have high concentrations of REE, Y, Zr, Hf, U, Th, Ta, Sn, Ga, Cu, Pb, Se, Hg, Sb, and Te. The highest concentrations of these elements were found at the contact with coals. The enrichment of the coal with lithophile rare metals is possibly caused by their leaching from the tonsteins. The accumulation of these trace elements is a characteristic feature in coals both above and below the tonsteins. The width of the enrichment in the coal zone depends on the properties of chemical elements and features of the coal properties and character of interaction between the coals and tonsteins. The authors verify the pyroclastic nature of the initial matter of the tonsteins of the Azeisk deposit. Mineralogical and geochemical data from the tonsteins suggest a felsic (rhyolite) composition for the original volcanic matter that was altered in the aggressive acidic environments of the peat bogs. As a result of the burial of this material in a paleo-peatland some of the elements typical of felsic pyroclastics accumulated.
| Original language | English |
|---|---|
| Pages (from-to) | 99-111 |
| Number of pages | 13 |
| Journal | International Journal of Coal Geology |
| Volume | 153 |
| DOIs | |
| Publication status | Published - 1 Jan 2016 |
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Keywords
- Diagenetic processes
- Element enrichment
- Irkutsk Basin
- Jurassic coal
- Tonstein
ASJC Scopus subject areas
- Economic Geology
- Geology
- Stratigraphy
- Fuel Technology
Cite this
Nature of tonsteins in the Azeisk deposit of the Irkutsk Coal Basin (Siberia, Russia). / Arbuzov, S. I.; Mezhibor, A. M.; Spears, D. A.; Ilenok, Sergey Sergeevich; Shaldybin, Mikhail Victorovich; Belaya, E. V.
In: International Journal of Coal Geology, Vol. 153, 01.01.2016, p. 99-111.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Nature of tonsteins in the Azeisk deposit of the Irkutsk Coal Basin (Siberia, Russia)
AU - Arbuzov, S. I.
AU - Mezhibor, A. M.
AU - Spears, D. A.
AU - Ilenok, Sergey Sergeevich
AU - Shaldybin, Mikhail Victorovich
AU - Belaya, E. V.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - In this paper data on the mineral and chemical composition of tonsteins from the Jurassic Azeisk deposit located in the Irkutsk Basin (South Siberia, Russia) are presented. The mineral composition includes kaolinite (87-89%); quartz (3.0-4.0%), cristobalite (4.9-5.3%), illite (1.9-2.1%) and feldspar (1.0-2.0%). Accessory minerals comprise zircon, monazite, uranium oxides, native minerals (gold, silver, nickel, zinc, tungsten, and silicon), sulfides and intermetallic compounds. The tonsteins and coals of the Azeisk deposit have high concentrations of REE, Y, Zr, Hf, U, Th, Ta, Sn, Ga, Cu, Pb, Se, Hg, Sb, and Te. The highest concentrations of these elements were found at the contact with coals. The enrichment of the coal with lithophile rare metals is possibly caused by their leaching from the tonsteins. The accumulation of these trace elements is a characteristic feature in coals both above and below the tonsteins. The width of the enrichment in the coal zone depends on the properties of chemical elements and features of the coal properties and character of interaction between the coals and tonsteins. The authors verify the pyroclastic nature of the initial matter of the tonsteins of the Azeisk deposit. Mineralogical and geochemical data from the tonsteins suggest a felsic (rhyolite) composition for the original volcanic matter that was altered in the aggressive acidic environments of the peat bogs. As a result of the burial of this material in a paleo-peatland some of the elements typical of felsic pyroclastics accumulated.
AB - In this paper data on the mineral and chemical composition of tonsteins from the Jurassic Azeisk deposit located in the Irkutsk Basin (South Siberia, Russia) are presented. The mineral composition includes kaolinite (87-89%); quartz (3.0-4.0%), cristobalite (4.9-5.3%), illite (1.9-2.1%) and feldspar (1.0-2.0%). Accessory minerals comprise zircon, monazite, uranium oxides, native minerals (gold, silver, nickel, zinc, tungsten, and silicon), sulfides and intermetallic compounds. The tonsteins and coals of the Azeisk deposit have high concentrations of REE, Y, Zr, Hf, U, Th, Ta, Sn, Ga, Cu, Pb, Se, Hg, Sb, and Te. The highest concentrations of these elements were found at the contact with coals. The enrichment of the coal with lithophile rare metals is possibly caused by their leaching from the tonsteins. The accumulation of these trace elements is a characteristic feature in coals both above and below the tonsteins. The width of the enrichment in the coal zone depends on the properties of chemical elements and features of the coal properties and character of interaction between the coals and tonsteins. The authors verify the pyroclastic nature of the initial matter of the tonsteins of the Azeisk deposit. Mineralogical and geochemical data from the tonsteins suggest a felsic (rhyolite) composition for the original volcanic matter that was altered in the aggressive acidic environments of the peat bogs. As a result of the burial of this material in a paleo-peatland some of the elements typical of felsic pyroclastics accumulated.
KW - Diagenetic processes
KW - Element enrichment
KW - Irkutsk Basin
KW - Jurassic coal
KW - Tonstein
UR - http://www.scopus.com/inward/record.url?scp=84949309852&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84949309852&partnerID=8YFLogxK
U2 - 10.1016/j.coal.2015.12.001
DO - 10.1016/j.coal.2015.12.001
M3 - Article
VL - 153
SP - 99
EP - 111
JO - International Journal of Coal Geology
JF - International Journal of Coal Geology
SN - 0166-5162
ER -