Abstract
Ordered framboids from Devonian Chattanooga Shale (U.S.A.) and Rammelsberg Banderz (Germany) show a common orientation in any one sample. This observation was made using a stereographic method of reconstruction in which the lineations within the framboids were measured on each of three planes cut mutually at right angles from the rock samples. The explanation for this preferred orientation is not yet known, but it may originate from crystal-growth during compaction of the shales.
Zusammenfassung
Pyrit-„Himbeeren“ aus dem devonischen Chattanooga Shale (U.S.A.) und vom Rammelsberg Banderz zeigen bevorzugte Orientierungen ihrer inneren Struktur (Figure I) gegenüber der Sedimentschichtung. Diese Beobachtungen sind in stereographischen Projektionen aufgezeichnet. Der Vorgang der Orientierung mag auf die Kristallisation der Pyrit-Netzwerke während der Diagenese zurückzuführen sein.
References
Love, L. G., and G. C. Amstutz: Review of microscopic pyrite from the Devonian Chattanooga Shale and Rammelsberg Banderz. Fortschr. Min. 43, 273–309 (1966).
Ramberg, H., and T. Ekström: Note on preferred orientation of pyrite cubes in grit layers in slate. N. Jb. Miner. Monatsh. Dtsch. 8, 246–251 (1964).
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Amstutz, G.C., Park, W.C., Schot, E.H. et al. Orientation of framboidal pyrite in shale. Mineral. Deposita 1, 317–321 (1967). https://doi.org/10.1007/BF00205204
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DOI: https://doi.org/10.1007/BF00205204