Origin of rapakivi granites by stochastic modeling: Vyborg and Salmi Massifs |
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Authors: | Victor N Podkovyrov |
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Institution: | (1) Institute of Precambrian Geology and Geochronology of the Academy of Sciences of the U.S.S.R., 2 Makarova Emb, 199164 Leningrad B-164, U.S.S.R. |
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Abstract: | Grain sequences of Precambrian rapakivi granites of the Vyborg and Salmi Massifs have been compared with the stochastic model for ideal granite. These sequences show that classical rapakivi granites correspond to metasomatically weakly altered granites with a simple loss of Markov transitions from quartz and plagioclase. Observed parameters of the model indirectly indicate rapakivi magma had small volatile content and large viscosity which is also characteristic of many other Precambrian granites. |
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Keywords: | ideal granite rapakivi granite Markov chain likelihood ratio reversible Markov chain |
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