Olivine nephelinite

The two hills of Lützberg and Limberg form a small volcanic complex isolated on the Nw side of the main Kaiserstuhl volcano. They represent the youngest, and the most primitive, manifestation of volcanic activity of the Kaiserstuhl area. They are characterized by the unusual amount of xenocrysts (olivine and pyroxene) and mantle xenolith.

Bibliography

• Ulianov, A., Müntener, O., Ulmer, P., & Pettke, T. (2007). Entrained macrocryst minerals as a key to the source region of olivine nephelinites: Humberg, Kaiserstuhl, Germany. Journal of Petrology, 48(6), 1079-1118.
• Walter, B. F., Marks, M. A. W., & Markl, G. (2016). The Kaiserstuhl natural laboratory-an introduction and first results. Abstract Malawi Expert Council.
• Weisenberger, T. B., Spürgin, S., & Lahaye, Y. (2014). Hydrothermal alteration and zeolitization of the Fohberg phonolite, Kaiserstuhl Volcanic Complex, Germany. International Journal of Earth Sciences, 103(8), 2273-2300.
• Weisenberger, T., & Spuergin, S. (2009). Zeolites in alkaline rocks of the Kaiserstuhl Volcanic Complex, SW Germany–new microprobe investigation and the relationship of zeolite mineralogy to the host rock. Geologica Belgica

Photo
Olivine, and pyroxene crystals, set in a fine-grained matrix rich in altered olivine. Olivine nephelinite from Lützberg. PPL image, 2x (Field of view = 7mm)	Olivine, and pyroxene crystals, set in a fine-grained matrix rich in altered olivine. Olivine nephelinite from Lützberg. XPL image, 2x (Field of view = 7mm)	Olivine, and pyroxene crystals, set in a fine-grained matrix rich in altered olivine. Olivine nephelinite from Lützberg. PPL image, 2x (Field of view = 7mm)
Olivine, and pyroxene crystals, set in a fine-grained matrix rich in altered olivine. Olivine nephelinite from Lützberg. XPL image, 2x (Field of view = 7mm)	Olivine, and pyroxene crystals, set in a fine-grained matrix rich in altered olivine. Olivine nephelinite from Lützberg. PPL image, 2x (Field of view = 7mm)	Olivine, and pyroxene crystals, set in a fine-grained matrix rich in altered olivine. Olivine nephelinite from Lützberg. XPL image, 2x (Field of view = 7mm)
Olivine, and pyroxene crystals and large pyroxene xenocryst, set in a fine-grained matrix rich in altered olivine. Olivine nephelinite from Lützberg. XPL image, 2x (Field of view = 7mm)	Olivine, and pyroxene crystals and large pyroxene xenocryst, set in a fine-grained matrix rich in altered olivine. Olivine nephelinite from Lützberg. PPL image, 2x (Field of view = 7mm)	Olivine, and pyroxene crystals, set in a fine-grained matrix rich in altered olivine. Olivine nephelinite from Lützberg. XPL image, 2x (Field of view = 7mm)