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DOI 10.21440/2307-2091-2017-2-53-56                                                                                     Publication Date 11.07.2017

Evaluation of the nature of connection of metasomatic rocks and their educts by their acid-base properties pdf

G. P. Dvornik


The author developed the systematics of metasomatic rocks according to acid-base properties, expressed by the magnitude of the general basicity. There are four distinguished groups of metasomatites: highly basic (carbonatites, magnesian and calcareous endoskarns and exoscarnas, rodingites, calcite and dolomite-ankerite metasomatites), basic (serpentinites, fenites, gumbaites, microclinites, talcites, microcline-sericite, carbonate-talc and magnesite metasomatites), medium-basic (albitites, listvenites, eisites, propylites, biotite-orthoclase metasomatites), low-basic (berezites, muscovite-quartz greisens, argillizites, secondary quartzites, hematite-magnetite quartzites, jasperoids, quartz-sericite, chlorite-sericite-quartz, diaspore-pyrophyllite and quartz-pyrophyllite metasomatites). The author established signs of difference by the nature of the bond with the educt between metasomatites over aluminosilicate and carbonate rocks. Metasomatic rocks formed along the aluminosilicate substrate (magnesian and calcareous endoskarns, fenites, biotite-orthoclase and microcline-sericite metasomatites, albitites, serpentinites, gumbeites, eisites, greisenes, berezites, argillisites) have a characteristically significant positive correlation by basicity value with the rocks of the educt. The revealed differences are due to the peculiarities of the composition of substituted aluminosilicate and carbonate rocks and the hydrothermal solutions affecting them. The author established a significant positive correlation between the basicity of alkaline metasomatites (albitic, kalispat, feldspathoid), metasomatites of the acid leaching stage (muscovite-quartz greisens, secondary quartzites, berezites, argillisites) from the inner zones of experimental metasomatic columns and the composition of initial solutions expressed by pH. In addition, the basicity of magnesian and calcareous skarns weakly correlates with the pH of hydrothermal solutions.

Keywords: metasomatic processes; basicity of metasomatites and educts; correlation dependencies.

 

REFERENCES


1. Zarayskiy G. P. 1982, Zonal'nost' i usloviya obrazovaniya metasomaticheskikh porod [Zonality and formation conditions of metasomatic rocks], Moscow, 324 p.
2. Zharikov V. A., Rusinov V. L. 1998, Metasomatizm i metasomaticheskie porody [Metasomatism and metasomatic rocks], Moscow, 492 p.
3. Marakushev A. A. 1976, Metod termodinamicheskogo rascheta pokazateley osnovnosti gornykh porod i mineralov [The method of thermodynamic calculation of the basicity of rocks and minerals]. Byul. MOIP, otd. geol. [Bull. Soc. Imp. Nat. Mosc. Geological Department], vol. 51, no. 1, pp. 5–25.
4. Marakushev A. A. 1973, Petrokhimicheskaya sistematika izverzhennykh i metamorficheskikh gornykh porod [Petrochemical systematics of igneous and metamorphic rocks]. Izv. vuzov. Ser. Geologiya i razvedka [Proceedings of Higher Schools. Geology and Exploration], no. 8, pp. 3–16.
5. 1982, Kislotno-osnovnye svoystva khimicheskikh elementov, mineralov, gornykh porod i prirodnykh rastvorov [Acid-base properties of chemical elements, minerals, rocks and natural solutions], Moscow, 212 p.
6. Marakushev A. A. 1979, Petrogenezis i rudoobrazovanie (geokhimicheskie aspekty) [Petrogenesis and ore formation (geochemical aspects)], Moscow, 264 p.
7. Dvornik G. P. 1998, Sistematika metasomaticheskikh porod po kislotno-osnovnym svoystvam [Systematics of metasomatic rocks according to acid-base properties]. Geologiya metamorficheskikh kompleksov: Mezhvuz. nauch.-temat. sb. [Geology of metamorphic complexes: Interuniversity scientific-thematic collection], Ekaterinburg, pp. 83–94.
8. Dvornik G. P. 2014, Metasomatizm i zolotoe orudenenie kalievykh shchelochnykh massivov (na primere Tsentral'no-Aldanskoy shchelochnoy provintsii) [Metasomatism and gold mineralization of potassium alkaline massifs (on the example of the Central-Aldan alkaline province)], Ekaterinburg, 329 p.
9. Gryaznov O. N. 1992, Rudonosnye metasomaticheskie formatsii skladchatykh poyasov [Ore-bearing metasomatic formations of folded belts], Moscow, 256 p.
10. Sazonov V. N. 1984, Berezit-listvenitovaya formatsiya i soputstvuyushchee ey orudenenie [Berezite-Listvenite formation and its accompanying mineralization], Sverdlovsk, 208 p.
11. Dvornik G. P. 2012, Zolotorudnye metasomaticheskie formatsii Tsentral'no-Aldanskogo rayona [Gold ore metasomatic formations of the Central Aldan region]. Litosfera [Litosfera], no. 2, pp. 90–105.
12. Ugryumov A. N. 1993, Dzhasperoidnye mestorozhdeniya zolota (geologiya, usloviya razmeshcheniya i formirovaniya): dis. … d-ra geol.-mineral. nauk: 25.00.11 [Jasperoid gold deposits (geology, conditions of location and formation): dissertation of Doctor of geological-mineralogical sciences: 25.00.11], Ekaterinburg, 620 p.
13. Fedorchuk V. P. 1969, Okolorudnye izmeneniya rtutno-sur'myanykh mestorozhdeniy [Near ore changes in mercury-antimony deposits], Moscow, 264 p.
14. Korzhinskiy M. A. 1994, Obshchie zakonomernosti khimicheskogo povedeniya solevykh i kislotnykh komponentov v slozhnom khloridno-uglekislovodnom flyuide pri povyshennykh T-R parametrakh [General regularities of the chemical behavior of salt and acid components in a complex chloride-carbon dioxide fluid at elevated T-P parameters]. Eksperimental'nye problemy geologii [Experimental problems of geology], Moscow, pp. 607–623.
15. Korzhinskiy D. S. 1982, Teoriya metasomaticheskoy zonal'nosti [The theory of metasomatic zoning], Moscow, 104 p.

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