Myrmekites of exsolution and replacement origins—a discussion

Phillips, Evan R.

doi:10.1017/s001675680004735x

Cited by 3 publications

(1 citation statement)

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“…Before completing this section, it should be noted that Ashworth (1972), Phillips, Ransom & Vernon (1972) and Vernon (1976, p. 122) proposed independently that exsolution and replacement processes could interact (also Ashworth, 1973;Phillips, 1973). zCaAl 2 Si 2 O g +4zSiO, 2 alkali feldspar orthoclase plagioclase quartz myrmekite where D stands for vacant cation sites and x > y P z.…”

Section: The Hypothesesmentioning

confidence: 99%

On polygenetic myrmekite

Phillips

1980

Geol. Mag.

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A brief review of Becke's (1908) replacement and Schwantke's (1909) exsolution models for myrmekite genesis and further consideration of the morphology and spatial distribution of myrmekite as outlined by Phillips (1974) lead to the conclusion that both hypotheses have a place in explaining the origin of myrmekite. The Schwantke model is generally best applied, for example, to high-level undeformed massive granitoids and the Becke model to deformed metamorphic rocks. The latter hypothesis and a third model involving interaction between exsolution and replacement (Ashworth, 1972) may be used especially to explain the association of muscovite and myrmekite in rocks whose mineral assemblages have undergone retrograde modification, involving either redistribution of Na, Ca and K by local metasomatic reactions among the mineral grains, or metasomatic change of bulk rock composition.

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Section: The Hypothesesmentioning

confidence: 99%