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Nigrine – a heavy mineral aggregate indicative of pegmatites and their siliceous root zones

[Nigrin – ein Indikator-Schwermineralaggregat für Pegmatite und ihre quarzreichen Wurzelzonen.]

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Nigrine is a black mineral aggregate composed of rutile (often enriched in Nb and/or W) and ilmenite (enriched in Mn). Nigrine occurs as heavy mineral grains in alluvial-fluvial drainage systems in areas underlain by aplitic and/or pegmatitic quartz-feldspar rocks. Three types of nigrine were established in the NE Bavarian Basement; they provide an insight into the unroofing story of bedrock deposits. Type A nigrine originates from the deeply eroded siliceous root zone of the pegmatites. This type formed in mylonitic quartz bearing shear zones in the course of pre- to synkinematic nigrinisation. Postkinematic type B nigrine originates from the highly differentiated parts of the pegmatite stocks abundant in rare metal concentrations. Postkinematic type C indicates the passage into the scheelite and wolframite mineralisation at the margin of a pegmatite district.

German
Nigrin ist ein schwarzes Mineralaggregat, das aus Rutil (z. T. reich an Nb und /oder W) und Ilmenit (reich an Mn) besteht. Dieses Mineralaggregat kommt in alluvialen und fluviatilen Ablagerungen innerhalb oder nahe von Arealen vor, die von aplitischen und pegmatitischen Gesteinen unterlagert sind. Im nordostbayerischen Grundgebirge lassen sich drei Grundtypen von Nigrin unterscheiden. Sie geben einen Einblick in das Abtragungsgeschehen im Einzugsgebiet der Nigrin führenden Gewässersysteme. Der Nigrintyp A geht auf die quarzreichen Wurzel- bzw. Kernzonen der Pegmatite zurück. Er entstand im Zuge einer prä- bis synkinematischen Nigrinisierung in mylonitischen, Quarz führenden Scherzonen, die das Grundgebirge in unterschiedlichen Dimensionen durchsetzen. Der postkinematische Typ B unter den Nigrinen lässt sich auf hochdifferenzierte Pegmatite, die reich an seltenen Metallen (z. B. Nb, Ta, Li) sein können, zurückführen. Der postkinematisch gebildete wolframreiche Nigrintyp C markiert den Übergang in die Scheelit und Wolframit führenden Mineralisationen, die am Rande der Pegmatitgebiete liegen.
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Keywords: GERMANY; ILMENITE; NIGRINE; PEGMATITE; RUTILE; UNROOFING; VARISCAN

Document Type: Short Communication

Publication date: June 1, 2009

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  • Zeitschrift der Deutschen Gesellschaft für Geowissenschaften (ZDGG) is an international peer reviewed journal that accepts papers on research and applied topics in the Earth Sciences. It is published online and in print. One volume, consisting of four issues is published annually. The journal is continously published by the German Geological Society since its foundation in 1848. It was relaunched in 2005.

    ZDGG invites the submission of English, German and French language papers from all fields of geology, hydrogeology, paleontology, tectonics, sedimentology, engineering geology and of course environmental geology to name a few. The editors of ZDGG also invite suggestions for thematic issues.
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