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

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Abstract

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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About the authors

A. R. Kotelnikov

Korzhinskii Institute of Experimental Mineralogy RAS (IEM RAS)

Author for correspondence.
Email: kotelnik1950@yandex.ru
Russian Federation, Acad. Osipyan street, 4, Chernogolovka, Moscow district, 142432

T. I. Shchekina

Moscow State University (MSU)

Email: kotelnik1950@yandex.ru

Geol. faculty

Russian Federation, Leninskie gory, 1, Moscow, 119991

N. I. Suk

Korzhinskii Institute of Experimental Mineralogy RAS (IEM RAS)

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

Z. A. Kotelnikova

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

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

T. V. Antonovskaya

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

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

References

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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.
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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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