Modern state of the doctrine of processes and conditions of pegmatite formation

V. D. Nikitin

Vol 40

Pages:

77-94

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RUS

Article

Modern state of the doctrine of processes and conditions of pegmatite formation

Authors:

V. D. Nikitin

Date submitted:

1958-07-04

Date accepted:

1958-09-26

Date published:

1959-07-22

Abstract

Thanks to the outstanding studies of pegmatites made by A.E. Fersman, a group of his collaborators and followers, which aroused general interest in this important type of mineral deposits, as well as the works of numerous foreign scientists, the hypothesis of pegmatite formation by fractional crystallization of the so-called “pegmatite” melt was almost universally accepted among Soviet geologists for many decades. The hypothesis was based on the idea of successive crystallization of this melt in a calm tectonic environment, in a closed and isolated chamber of the pegmatite vein body. It was assumed that rare-metal minerals and large-crystalline mica, as well as minerals of the accessoria (garnets, apatite, tourmaline, etc.) appeared by crystallization in the free environment of the “pegmatite melt” before the surrounding quartz-feldspar rocks of the pegmatite crystallized. It was supposed that in some cases some of the rare-metal minerals could also arise as a result of autometasomatic reactions under the influence of the so-called “residual solutions” separating from the “pegmatite melt” here on the spot, inside the vein chamber.

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References

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Modern state of the doctrine of processes and conditions of pegmatite formation

Abstract

References

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