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Simplified section of the tourmaline-bearing pegmatite from Sukor o (after Nagy, 1967a). Legend: 1 5 granite; 2 5 graphic granite; 3 5 miarolitic cavity; 4 5 microgranite; 5 5 tourmalinebearing graphic granite; 6 5 coarse-grained pegmatite; 7 5 aplite
Source publication
Three distinct paragenetic and compositional types of tourmaline were described from the Velence Granite and the surrounding contact slate. Rare, pitch-black, disseminated tourmaline I (intragranitic tourmaline) occurs in granite, pegmatite, and aplite; very rare, black to greenish-gray, euhedral tourmaline II (miarolitic tourmaline) occurs in miar...
Contexts in source publication
Context 1
... tourmaline-containing pegmatite of Sukor o was described in detail by Nagy (1967a). According to his study, the pegmatite formation is linked to a biotitic aplite dike in which lens-shaped pegmatitic formations have been developed in an asymmetric arrangement (Fig. 4). Their dimensions depend on the thickness of the aplite dike. Their main minerals are quartz, K-feldspar, plagioclase (albite to andesine composition), biotite, and amphibole. The tested tourmaline forms pitch black, stubby columnar crystals with triangular cross-section, that can reach 1.5-2 cm in length, and came from the formation ...
Context 2
... 4). Their dimensions depend on the thickness of the aplite dike. Their main minerals are quartz, K-feldspar, plagioclase (albite to andesine composition), biotite, and amphibole. The tested tourmaline forms pitch black, stubby columnar crystals with triangular cross-section, that can reach 1.5-2 cm in length, and came from the formation No. 5 of Fig. 4. The crystals are fragmented, their cracks filled with quartz and kaolinized ...
Context 3
... Sukor o sample is a "green" tourmaline, which was described as elbaite by Nagy (1967a) from a miarolitic cavity of the pegmatite (see Fig. 4, No. 3). The tested specimen was collected by B ela Nagy in March 1974 in the rubblestone quarry of Sukor o and now it is in the collection of the MBFSZ under the catalog number ...
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Citations
... Consequently, it is possible to say that in all these cases, apart from the one from the Western Karawanks, the here-studied tourmalines are different. Balen and Petrinec (2011) [72][73][74][75] analyzed tourmalines from Cretaceous Moslavačka granite (Croatia), Permian-Triassic Sopron orthogneiss (Hungary), Cretaceous Pohorje marble (Slovenia) and Permian Velence granite (Hungary), but none of these tourmalines are similar to our detrital ones, so a more precise determination of their provenance is rather impossible at present. ...
In the SE Alps, two Cretaceous–Eocene flysch basins, Julian and Brkini, filled with turbidite sediments, are present. This study novelly reports heavy mineral assemblage counts and detrital tourmaline characterization for 11 samples. It is possible to define three different groups, characterized by the presence of (1) a clinopyroxene–epidote–low-ZTR (zircon+tourmaline+rutile; 5%) sample association, (2) a high-ZTR (>48%)–garnet–apatite association and (3) a low-ZTR (<40%)–Cr-spinel–garnet association. Detrital tourmalines from both the Julian and Brkini flysch basins are rather similar in composition, associated with metapelites and metapsammites coexisting or not coexisting with an Al-saturating phase, ferric-iron-rich quartz–tourmaline rocks and calc–silicate rocks; however, their number is drastically different. In fact, even if the percentage of heavy minerals is very low and similar in both basins (0.17–1.34% in weight), in the Julian basin, the number of tourmaline crystals is much lower than that in Brkini (1–14 vs. 30–100), suggesting an important change in the provenance area. Interestingly, the presence of a high amount of tourmaline derived from ferric-iron-rich quartz–tourmaline rocks and calc–silicate rocks makes these two basins different from all the Cretaceous flysch basins of Bosnia and the Northern Dinaric zone, where these supplies are missing or very limited.
