Structural ordering of feldspars as an indikator of the temperature of mineralogenesis

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Resumo

The processes of albite ordering in the range of low temperatures 500–150°C at a pressure of 0.5–1 kbar in alkaline solutions of sodium hydroxide with an excess of silica have been experimentally studied. Based on the data of our experiments and literature data on the ordering of albites and felsic plagioclases, dependences have been derived that make it possible to estimate the temperature from the degree of their structural ordering. The temperatures for plagioclase-bearing parageneses of various natural complexes of the greenschist facies of metamorphism have been determined.

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Sobre autores

A. Kotelnikov

Korzhinskii Institute of Experimental Mineralogy RAS (IEM RAS)

Autor responsável pela correspondência
Email: kotelnik1950@yandex.ru
Rússia, Acad. Osipyan street, 4, Chernogolovka, Moscow district, 142432

T. Shchekina

Moscow State University (MSU)

Email: kotelnik1950@yandex.ru

Geol. faculty

Rússia, Leninskie gory, 1, Moscow, 119991

N. Suk

Korzhinskii Institute of Experimental Mineralogy RAS (IEM RAS)

Email: sukni@iem.ac.ru
Rússia, Acad. Osipyan street, 4, Chernogolovka, Moscow district, 142432

Z. Kotelnikova

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, RAS (IGEM RAS)

Email: kotelnik1950@yandex.ru
Rússia, Staromonetny st., 35, Moscow, 119017

T. Antonovskaya

Yushkin Institute of Geology RAS (IG Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences)

Email: kotelnik1950@yandex.ru
Rússia, Pervomaiskaya st., 54, Syktyvkar, Republic of Komi, 167982

Bibliografia

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  2. Котельников А.Р. Изоморфизм в каркасных алюмосиликатах. (1995). Дисс. … докт. геол.-мин. наук. Москва: МГУ, 528 с.
  3. Сендеров Э.Э., Щекина Т.И., Тобелко К.И. (1971) Изучение кристаллизации низкого альбита. Геохимия. (8), 963–973.
  4. Сендеров Э.Э., Щекина Т.И. (1976) О стабильности структурных форм альбита и условиях образования их в природе. Геохимия, (2), 159–175.
  5. Шведенкова С.В., Шведенков Г.Ю., Стрехлетов А.Н. (1989) Фазовые субсолидусные равновесия в системе альбит-анортит-Н2О при давлении 100 МПа. Геология и геофизика. (1), 69–75.
  6. Bambauer H.U., Eberhard E., Viswanathan K. (1967) The lattice constants and related parameters of plagioclases (low). Schw. Miner. Petrogr. Mitt. Bd. 47 (1), 351–364.
  7. Blasi A., Blasi C. (1994) Aspects of alkali feldspar characterization: prospects and relevance to problems outstanding. Feldspars and their reactions. NATO ASI series. I. Parsons (ed.), 421, 51–101.
  8. Burnham C.W. (1991) Least-squares refinement 421 of crystallographic lattice parameters for IBM PC/XT/AT and compatibles. Harward University, Cambridge MA02138, (program description, 24 p.)
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  13. Dujon S.-C., Lagache M. (1984) Echanges entre plagioclases et solutions aqueuses de clorures sodi-calciques a differentes pression et temperatures (400 a 800 C, 1 a 3 kilobars) Bull. miner., 107 (3–4), 553–569.
  14. Kroll H., Muller W.F. (1980) X-ray and electron-optical investigations of synthetic high-temperature plagioclases. Phys. Chem. Minerals. 5, 255–277.
  15. Kroll H., Kotelnikov A.R., Goettlisher J., Valyashko T.V. (1995) (K, Sr)- feldspar solid solutions: the volume behavior of heterovalent feldspars. Eur. J. Mineral., 7, 489–499,
  16. Martin R.F. The hydrothermal synthesis of low albite. (1969) Contrib. Mineral. Petrol. 23, 323–339.
  17. Mason R.A. (1979) The ordering behavior of albite in aqueous solutions at 1 kbar. Contrib. Mineral. Petrol. 68, 269–273.
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  19. Nekvasil H. (1993) Ternary feldspar/melt equilibria: a review. Feldspars and their reactions. NATO ASI series. I. Parsons (ed.). 421, 195–220.
  20. Smith J.V. Phase relations of plagioclase feldspars. (1984) Feldspars and Feldspathoids (NATO ASI Series C137). Brown W.L. (ed). Reidel, Dordrecht, 55–94.

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2. Fig. 1. The ordering of albite depending on temperature, according to various works (the point numbers correspond to the numbers in Table 1) (a); the structural transition of high-low albite according to the work (Senderov, Shchekina, 1976) (b).

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3. Fig. 2. Dependence of plagioclase compositions on the parameter Δ131 (Cu-Ka1). (Eberhard E., 1967): 1 – 600C, 2 – 700C, 3 – 800C; (Kotelnikov, 1995): 4 – 500C.

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