Petrographie und Mineralfazies einer konglomeratischen Tanner Grauwacke aus dem Unterharz |
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| Authors: | Dr Hans Gerhard Huckenholz |
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| Institution: | (1) Mineralogisch-Petrographisches Institut der Universität zu Köln, Deutschland;(2) Zur Zeit Carnegie Institution of Washington Geophysical Laboratory, 2801 Upton Street, N.W., 20008 Washington, D.C. |
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| Abstract: | A very coarse grained graywacke from Strassberg in the Lower Harz Mountains (Germany) consists of rock-fragments, feldspars, quartz, chlorites, micas, accessories and ores. Low grade metamorphic mineral reactions are indicated by the formation of 2M-muscovite +chlorite+sphene+albite in the matrix of the graywacke, by prehnite+chlorite+ sphene+calcite+sericite+albite (±quartz) in volcanic rock-fragments, and by prehnite +calcite+quartz along fine fissures. The newly formed minerals in the coarse grained graywacke belong to the laumontite-prehnite-quartz-facies of the burial metmorphism. However, the formation of the low grade minerals is caused by thermal metamorphism in outer contact zones of the Ramberg granite intrusion in the Strassberg area. |
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