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Пренит от две пегматитови находища в България [Prenite of two localities from Bulgaria]

Чавдар Каров; Светослав Петрусенко [Chavdar Karov; Svetoslav Petrussenko]

29 May 1997 · volume 7 · pp. 97–103 · PDF [full text]

Abstract: [no abstract available originally]

[Summary]: Prenite of pegmatite origin is reported for the first time from Bulgaria. Two localities of prenite in chamber pegmatite within bedrock of monzonite-diorite parts of Vitosha (W Bulgaria) and Izgrev (SE Bulgaria) plutons of Late Cretaceous age are described. Prenite of both localities forms drusy subparallely arranged on (001) aggregates of crystals with curved walls, usually on (110) and (001) and very rarely on (010) and (100). Strongly split, fan-shaped to semispheroidal aggregates with roughly crest-like surfaces of diameter ranging from 0,3 to 1,5 centimetres are often encountered in the Vitosha locality. The colour of the prenite is pale yellow-green. The results of six microprobe analyses (three for each locality), compared to the prenite theoretical composition are presented in table 1. X-ray data of prenite fit very well to the standards. The paragenesis of prenite is typically of pegmatite type in Vitosha and Izgrev localities. There are small differences in the mineralogical composition and the morphological peculiarities of both localities. Prenite was formed immediately after epidote and chlorite. They cover the main pegmatite paragenesis represented by: orthoclase, albite, titanite, quartz, amphibole, turmaline, , as well as molybdenite, chalcopyrite, galena, tennantite, magnetite. Zeolites (chabasite, stilbite, heulandite, laumontite) apophyllite and calcite were formed after prenite. It can be suggested that prenite was formed at the expence of plagioclase, which is partially or totally altered everywhere around the chambers.

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